Chapter Four · failure evidence
What Vibration & Damping Analysis got wrong, from 109 dissertations
Across structural dynamics, materials, and instrumentation, vibration and damping analyses frequently encounter discrepancies between theoretical assumptions and physical behavior. Numerical simulations suffer from inaccurate damping formulations and modeling simplifications, while physical measurements are disrupted by parasitic vibrations, fixture compliance, and sensor limitations. These records come from PhD theses at 26 institutions, 2021 to 2026. Each links to its thesis. They were extracted by language models reading the full text, so treat each as a lead to read, not a verdict.
Damping formulations and numerical dissipation models causing instability, overdamping, or unphysical energy loss
Assumptions regarding linear, proportional, or constant viscous damping coefficients often lead to severe overprediction of damping, negative coefficients, or numerical divergence. Algorithmic damping and dissipation constraints in dynamic simulations further distort wave propagation and produce unphysical stress distributions.
Tried and failed
uniform scaling of damping coefficients across all DOFs applied to multibody dynamic system simulation. Outcome: worse than baseline. Reason: caused an overdamped response, eliminating characteristic transient acceleration peaks and over-predicting peak accelerations elsewhere
A whole spine multibody model for predicting injury in high-rate axial loading · Imperial
Tried and failed
Kirchhoff wavenumber correction for visco-thermal damping applied to acoustic pressure transfer function gain. Outcome: worse than baseline. Reason: significantly overestimates acoustic damping compared to linearized Navier-Stokes reference simulations
Thermoacoustic instabilities in future hybrid rocket engines · Imperial
Tried and failed
low-order system identification neglecting actuator dynamics applied to resonant system transfer functions. Outcome: worse than baseline. Reason: unmodeled actuator dynamics introduced massive damping estimation errors in low-DOF models
Forced response system identification of gas turbine fan flutter · MIT
Tried and failed
enforcing dissipativity constraints in reduced-order models applied to turbulent flow simulation. Outcome: worse than baseline. Reason: the constraints caused excessive overdamping in higher-dimensional model subspaces
Data-Driven Variational Multiscale Reduced Order Modeling of Turbulent Flows · Virginia Tech
Tried and failed
large multiplicative damping scaling factors applied to wave propagation site response simulation. Reason: excessive damping led to severe unconservative underprediction of high-frequency wave amplification
Modeling multidimensional and multi-scale seismic site response using a data-driven 3D Vs model · UT Austin
Tried and failed
first-order Euler time discretization applied to free-surface wave propagation simulations. Outcome: worse than baseline. Reason: introduced severe numerical dissipation causing artificial wave damping over propagation distance
Nonlinear forcing, response and damping of oscillating water columns · Imperial
Lost to a baseline
Least-Squares Complex Exponential consistently overestimated damping ratios for modes 1 and 2 compared to N4SID on the three-storey structure benchmark
Identification of flexible structures dynamics · Cranfield
Considered and rejected
Considered and rejected: Rejected standard linear viscous damping in favor of complex stiffness with hysteretic damping because viscous damping incorrectly predicts zero phase shift as frequency approaches zero.
Towards a safe and responsive control framework for human-centered robots · UT Austin
Tried and failed
implicit dynamic finite element analysis applied to viscoelastic soft tissue contact modeling. Reason: default numerical damping caused unphysical persistent residual stresses after contact release
Numerically modelling skin-product interaction: applications to tactile perception and skin injury · Imperial
Tried and failed
theta-method implicit time integration applied to transient dynamic structural simulation. Reason: severe algorithmic damping at low frequencies causing unphysical energy dissipation despite step size reduction
Dynamics of conveyer belts using the HHT finite element technique with PID control · Iowa State
Tried and failed
empirical damping in driven nonlinear oscillator equations applied to nonequilibrium lattice dynamics in thin films. Outcome: did not generalise. Reason: standard empirical damping cannot account for long-lived strain even with arbitrarily small damping values
Tried and failed
proportional damping model updating with modal data applied to structural dynamics finite element model. Reason: optimisation produced unphysical negative damping coefficients across multi-mode configurations
Finite element model updating of exponential non-viscous damping systems · Georgia Tech
Tried and failed
Kelvin-Voigt linear viscoelastic damping model applied to passive biomechanical exoskeleton tissue dynamics. Outcome: did not generalise. Reason: damping parameter varied by nearly three orders of magnitude across different operating frequencies
Beyond resonance: Synchronous and stretch-activated actuation in insect flight · Georgia Tech
Tried and failed
viscoelastic contact models in differential dynamic programming applied to contact trajectory optimization. Reason: acceleration-dependent damping terms excessively complicate state-space formulation compared to quasi-static models
Contact-Aware Safe Robotic Manipulation - Dexterity and Trajectory Planning · Georgia Tech
Tried and failed
modal analysis for structural viscous damping coefficients applied to nonlinear beam structural dynamics simulation. Outcome: unstable. Reason: calculated damping coefficients were excessively small, leading to numerical divergence
On the validation of aeroelastic simulations of wind turbines using digital image correlation · Leibniz Universität Hannover Repository
Tried and failed
explicit joint damping in physics engines applied to compliant musculoskeletal simulation. Outcome: unstable. Reason: explicit damping integration causes numerical instabilities and jitters at high damping values required by muscle models
Neuromechanical Simulations of Animats with Decentralised Control · EPFL
Tried and failed
lumped-parameter viscous radiation damping approximations applied to dynamic friction slider systems. Reason: fixed damping coefficients either eliminate or excessively overpredict dynamic stress overshoot
Mathematical and Computational Modeling of Injection-induced Seismicity · MIT
Tried and failed
fractional hereditary integral with weak strain damping applied to nonlinear viscoelastic constitutive modeling. Outcome: unstable. Reason: damping parameter falling below memory kernel order causes unbounded stress growth and non-convergence to steady state
Tried and failed
linear viscous mass-spring-damper impedance modeling applied to human joint biomechanics. Outcome: did not generalise. Reason: Cannot capture low-frequency non-zero asymptotic phase lag or invariant damping ratio across varying stiffness
Towards a safe and responsive control framework for human-centered robots · UT Austin
Tried and failed
viscous material damping applied to long-period flexural-gravity wave attenuation. Reason: predicted energy dissipation was orders of magnitude too low compared to observed quality factors
Tried and failed
large Rayleigh damping in implicit dynamic simulations applied to brittle fracture modeling in networks. Reason: excessive artificial damping suppressed characteristic elastic-brittle fracture and caused unphysical progressive failure
Tried and failed
High continuous damping terms with explicit time-stepping applied to hyperbolic partial differential equation systems. Outcome: too slow. Reason: Excessive damping introduced extreme numerical stiffness, causing prohibitively small time steps in explicit integrators.
RELATIVISTIC FORCE-FREE ELECTRODYNAMICS WITH SPECTRAL METHODS · Cornell
Considered and rejected
Considered and rejected: Rejected Powers 1D simplified Navier-Stokes compression model due to high computational cost and arbitrary damping parameters required to stabilize non-linear ODEs solved via the Method of Lines.
Investigation of the limit-stable operating conditions of centrifugal turbocharger compressors · Imperial
Considered and rejected
Considered and rejected: Rejected purely elastic model in favor of viscoelastic formulation due to FEM numerical pollution at high frequencies and artificial resonance instabilities.
Bayesian inversion for Magnetic Resonance Elastography · University of Nottingham Repository
Simplified structural and dynamic models failing to predict vibration behavior and transient responses
Simplified kinematics, linearised modal stability analysis, and low-order beam or lumped-parameter models fail to capture higher-order bending modes and true transient amplitudes. Reduced-order dynamic models also exhibit numerical chattering, phase lag, or instability when unmodeled couplings and non-linearities are neglected.
Tried and failed
complex eigenvalue analysis applied to friction-induced vibration instability prediction. Outcome: did not generalise. Reason: linearised modal stability analysis underpredicted unstable frequencies compared to experimental spectra
An investigation of brake squeal from a coupled tribology and dynamics perspective · Imperial
Tried and failed
Physics-based digital twin with data-driven validation applied to Hydrodynamic bearing dynamics. Reason: Unmodeled dynamic coupling and external motor vibrations violated validation threshold
Applying Digital Twin in a Rotating Mechanical System and a Photovoltaic System · Texas Tech
Tried and failed
steady-state dynamic response analysis applied to tracked vehicle ride vibration modeling. Outcome: did not generalise. Reason: steady-state analysis systematically overestimated vibration levels compared to true transient dynamics on sinusoidal terrain profiles
Tried and failed
transferring optimal parameters across different motion profiles applied to cam-driven elastic mechanism vibration reduction. Outcome: did not generalise. Reason: optimal timing parameters derived for harmonic motion failed to suppress residual vibration in polynomial motion profiles
Steady state vibration analysis of cam driven elastic slider crank linkage with displacement parameter variation · Iowa State
Lost to a baseline
Theoretical lumped-parameter SMA cable models (L1, L2, T, pi) yielded less reliable capacitance and resonance estimates than direct experimental breadboard trial-and-error.
Lost to a baseline
2D rigid cylinder simulation recorded a lower maximum vibration amplitude of 0.81 compared to 0.97 in the experimental baseline of Khalak and Williamson (1996)
Lost to a baseline
Euler–Bernoulli beam formulations overestimated perfect CNT natural frequencies by 12%, 15%, and 20% across 1st bending, 3rd bending, and axial vibration modes compared to Timoshenko beam formulations.
Study on the Mechanical Properties of Carbon Nanotube Coated‒Fiber Multi-Scale (CCFM) Hybrid Composites · IRIS - POLITO - prod
Considered and rejected
Considered and rejected: Rejected modal analysis techniques for LV motion modeling because modal space vibration parameters lack anatomical significance and localization properties.
Model-Based Shape and Motion Analysis: Left Ventricle of a Heart · Penn
Considered and rejected
Considered and rejected: Rejected discrete multi mass-spring-damper models because they could not fully explain continuous tibial vibrations.
Novel Methods Using Acoustics and Bioimpedance to Assess Musculoskeletal Health and Performance · Georgia Tech
Tried and failed
reducing control loop bandwidth applied to sub-synchronous oscillation damping. Outcome: worse than baseline. Reason: damping improvement was negligible while disturbance rejection capability degraded
Tried and failed
local depolarizing and thermal relaxation noise modeling applied to quantum simulation damping factor estimation. Outcome: did not generalise. Reason: local noise models consistently underestimate damping and signal suppression compared to actual hardware
Lost to a baseline
In the tachometer constant input/weak linkage/compliant spring scenario, the precursor model was actually a closer approximation (θ=0.0318014) to the most complex model than AIM's final generated model (θ=0.0624238) due to light damping dynamics.
Reducing the Need for Assumptions in the Automated Modelling of Physical Systems · De Montfort Open Research Archive (DORA)
Considered and rejected
Considered and rejected: Rejected using smooth approximations of the absolute value function |r_b(k)| in AUV hydrodynamic damping to achieve polynomial parameter dependence, choosing instead an undermodeled damping term where |r_b(k)| is set to zero.
On Data-Driven Modeling, Robust Control, and Analysis for Complex Dynamical Systems · Virginia Tech
Considered and rejected
Considered and rejected: Rejected degree-of-freedom matrix damping in favor of simple independent SISO BOSEM-to-BOSEM damping loops
Direct measurement of coating thermal noise in the AEI 10m prototype · Leibniz Universität Hannover Repository
Considered and rejected
Considered and rejected: Rejected using naive single state equation ˙β = B'(h)˙h directly because it causes loss of stabilizability at the origin; resolved by adding auxiliary/damping error term -γ(z + β0 - B(h)).
Safety Embedded Optimal Decision Making and Control Via Barrier States · Georgia Tech
Tried and failed
deep span aeroelastic geometry modification applied to wind turbine blades. Outcome: unstable. Reason: extending structural twist modifications too far inboard induced severe aeroelastic vibrations and numerical instabilities
Lost to a baseline
Conventional surface grinding achieved lower surface roughness (Ra) than rotary ultrasonic surface machining with vertical ultrasonic vibration across identical cutting settings.
Rotary ultrasonic surface machining of carbon fiber reinforced plastic composites · Texas Tech
Lost to a baseline
First-order VEM (VEM H1) and FEM (FEM H1) showed displacement phase lag over time in transversal vibration of a thick beam relative to quadratic FEM H2
A Virtual Element Method for Contact Modeling and Dynamics · Leibniz Universität Hannover Repository
Lost to a baseline
Dynamic average consensus introduced high-frequency chattering/ripple and lower damping under delays compared to the smoother response of slow conventional consensus
Finite-time cooperative control strategies for the economic operation of hybrid AC/DC microgrids · University of Nottingham Repository
Considered and rejected
Considered and rejected: Rejected measuring machine compliance during machine standstill with pre-clamping force, because rotational and dynamic settling effects alter contact stiffness and damping.
Aktive, modellbasierte Verschleißbeeinflussung beim Außenrundeinstechschleifen mittels elektromagnetischer Aktoren · Leibniz Universität Hannover Repository
Considered and rejected
Considered and rejected: Rejected direct position-based input shaping in favor of velocity-profile shaping for better load vibration mitigation.
Optimal Control of Differentially Flat Systems · DSpace at SUNY Buffalo
Boundary condition compliance, joint artifacts, and structural interference distorting modal identification
Non-ideal physical fixtures, joint rattling, and suspension friction introduce external modes and parasitic damping that distort modal parameters. Sensor mounting dynamics and closely spaced resonances further obscure true natural frequencies and prevent accurate mode alignment.
Tried and failed
modal assurance criterion for mode alignment applied to closely spaced vibration modes. Outcome: unstable. Reason: mode alignment uncertainty in subspace causes high variance and scattering for closely spaced modes
A probabilistic approach of vibration based structural health monitoring for wind turbine towers · Leibniz Universität Hannover Repository
Tried and failed
vibroacoustic modal analysis for implant stability assessment applied to orthopedic screw fixation. Outcome: no signal. Reason: morphological and surgical variations created confounding variables obscuring resonance correlation without direct mechanical calibration
Intraoperative Feedback System to Predict Long-Term Pedicle Screw Fixation using Modal Analysis · Harvard
Tried and failed
vibroacoustic modal analysis via swept-sine excitation applied to multi-component orthopedic implant stability assessment. Outcome: no signal. Reason: loose mechanical joints rattled, producing spurious low-frequency peaks that masked true interface resonances
Intraoperative Feedback System to Predict Long-Term Pedicle Screw Fixation using Modal Analysis · Harvard
Tried and failed
impact testing for structural modal identification applied to bridge structural vibration modes. Outcome: no signal. Reason: asymmetric excitation failed to adequately excite purely symmetric vibration modes
State, Parameter, and Input Estimation through MMSE Estimation for Structural Systems · Georgia Tech
Tried and failed
experimental modal validation with tip-mass boundary fixturing applied to structural damping in composite beams. Reason: boundary conditions shifted from simply supported to double-cantilever at higher modes, adding spurious parasitic friction damping
Tried and failed
mechanical and electrohydraulic vibration excitation applied to large-scale forced response modal testing. Reason: limited frequency bandwidth and non-linear control challenges at low frequencies
Forced Response System Identification of Full Aero-Engine Rotordynamic Systems · MIT
Considered and rejected
Considered and rejected: Rejected symmetric specimen suspension near vibration nodes because output amplitude was too low and other vibrational modes were excited
The high temperature oxidation and - corrosion of irons and steels · Cranfield
Considered and rejected
Considered and rejected: Rejected using 2-D axisymmetric numerical models for localized component vibration analysis because they fail to capture 3-D local vibrational modes of internal components.
Verification and validation of numerical models for seismic fluid-structure-interaction analysis of liquid metal reactors · DSpace at SUNY Buffalo
Considered and rejected
Considered and rejected: Rejected damping ratio and higher vibration modes (modes 2, 5, 7) as features for K-means damage clustering due to excessive estimation uncertainty, high baseline environmental variability, and closely spaced mode confusion.
Strategies of anomalies detection in bridges and tunnels as a tool for structural health management. New approaches and AI support. · IRIS - POLITO - prod
Considered and rejected
Considered and rejected: Rejected using higher vibration modes for parameter extraction because boundary compliance and seal non-infinite stiffness distort higher mode frequencies
Nondestructive, quantitative and local assessment of residual elastic properties in laminated composites · IRIS - POLITO - prod
Considered and rejected
Considered and rejected: Rejected cantilever/clamped or pinned boundary configurations because non-ideal fixtures introduce external modes that corrupt vibration signals.
Experimental investigation of the nonlinear dynamic behaviour of bolted lap joints · Cranfield
Considered and rejected
Considered and rejected: Rejected vibration-based modal analysis because global stiffness changes are insensitive to single-strut failures in lightweight periodic structures and require substantial mass-normalization and boundary-condition control.
Detection and characterization of in-service damage in lattice structures using ultrasonics · University of Nottingham Repository
Considered and rejected
Considered and rejected: Rejected roving hammer testing for characterising input damping parameters due to rigid body motion and suspension friction.
Considered and rejected
Considered and rejected: Directly attaching commercial accelerometers was rejected because dynamic mounting transfer functions cause vibration estimation errors.
Hybrid quantum sensing using an optomechanical resonator coupled atom interferometer · Leibniz Universität Hannover Repository
Considered and rejected
Considered and rejected: Rejected assembling top masses from multiple stacked calibration plate components for rock testing because high-frequency vibration causes microscopic interlayer slip that induces parasitic frictional damping and artificially inflates specimen material damping.
Advancing fixed-free resonant column testing for evaluating the dynamic properties of rock · UT Austin
Considered and rejected
Considered and rejected: Half-power bandwidth damping calculation was rejected in favor of free-vibration decay due to linear visco-elastic breakdown and electromagnetic motor damping bias.
Performance of caisson foundations subjected to flood-induced scour · IRIS - POLITO - prod
Tried and failed
frequency domain decomposition for modal identification applied to offshore wind turbine structural vibrations. Outcome: no signal. Reason: minimal frequency shifts, harmonic interference, and frequency bin resolution limits masked the natural modes
Dynamic Assessment of offshore wind turbines using fully integrated load simulations · Research Repository UCD
Considered and rejected
Considered and rejected: Standalone frequency-domain analysis (FFT) was rejected because it struggles to capture non-stationary, nonlinear vibration behaviors in operational blades.
Data-Driven Structural Health Monitoring of Wind Turbine Blades under Operational and Environmental Variability · Research Repository UCD
Tried and failed
inferring internal rotor dynamics from external casing sensors applied to rotating machinery vibration response. Outcome: no signal. Reason: neglected internal shaft dynamics and weak casing deflection signals at shaft resonance
Forced Response System Identification of Full Aero-Engine Rotordynamic Systems · MIT
Novel damping treatments and metamaterials underperforming conventional passive damping baselines
Engineered metamaterial void concepts, tuned inerters, and magnetic dampers consistently underperform standard continuous damping or baseline linear damping across broad frequency bands. Cyclic testing and operating conditions also cause elastomeric dampers to stiffen, degrade high-frequency isolation, or create secondary resonance peaks.
Tried and failed
vibrating wire viscometry applied to cryogenic fluid viscosity measurement. Outcome: worse than baseline. Reason: unreliable measurements caused by mechanical construction defects and uncontrolled damping issues
Tried and failed
Elastomeric vibration damping during cyclic loading applied to high-speed mechanical testing apparatus. Outcome: worse than baseline. Reason: Rubber dampers stiffened over repeated tests, amplifying vibrations rather than attenuating them
Tried and failed
viscoelastic backing damping for resonance suppression applied to piezoelectric acoustic sensing elements. Outcome: worse than baseline. Reason: reduced overall sensitivity by 5-6 dB without flattening resonance peaks
Acoustic emission pulse analysis: an integrated system for transducer calibration and signal processing · Cranfield
Tried and failed
rubber disc acoustic damping applied to violin acoustic tone modification. Outcome: worse than baseline. Reason: excessively reduced volume and created a dull timbre instead of sweet, delicate nuance
Musical features and performance guide of Darius Milhaud's Violin Sonata No. 2, Op. 40 · UT Austin
Tried and failed
tuned inerter damper optimized for dominant frequency applied to floating offshore structure vibration reduction. Outcome: worse than baseline. Reason: tuning only to dominant wave frequency failed to outperform traditional tuned mass dampers under broadband irregular excitation
Vibration Reduction of a Semisubmersible Floating Wind Turbine using Optimized Tuned Mass and Tuned Inerter Dampers · Virginia Tech
Tried and failed
geometric detuning and damping slots applied to higher-order mode suppression in resonant structures. Outcome: worse than baseline. Reason: could not selectively suppress parasitic dipole modes without degrading fundamental mode power transmission
High Power Microwave Generation for Advanced Particle Acceleration · MIT
Tried and failed
in-situ gas condensation frequency tuning applied to high-frequency nanomechanical resonators. Outcome: worse than baseline. Reason: condensed gas layer introduced substantial excess acoustic damping, drastically broadening mechanical resonance linewidth
Spin-Phonon Coupling in Nanodevices · Harvard
Lost to a baseline
Standard continuous damping achieved superior damping performance at the beam midpoint above the 630 Hz 1/3-octave band compared to the 1-void strips metamaterial concept
Damping of Vibration Using Periodically Voided Viscoelastic Metamaterials · Virginia Tech
Lost to a baseline
Standard damping achieved superior broadband attenuation above 1000 Hz compared to all voided metamaterials.
Damping of Vibration Using Periodically Voided Viscoelastic Metamaterials · Virginia Tech
Lost to a baseline
Magnetic shock absorber exhibited undesirable multiple resonance transmissibility peaks in the high-frequency range (>5 Hz) compared to linear baseline
Computational and Experimental Characterization of a Novel Nonlinear Magnetic Shock Absorber with Applications to Ground Vehicles · Carleton University Institutional Repository
Tried and failed
tuned inerter damper vibration control applied to floating offshore wind turbine platform. Outcome: no signal. Reason: dominant aerodynamic thrust and mooring line tensioning overpowered the damper effect under combined wind and waves
Modeling a Semi-Submersible Floating Offshore Wind Turbine With Tuned Inerter Dampers Within the Platform · Virginia Tech
Tried and failed
passive eddy-current damping applied to mechanical vibration isolation. Outcome: worse than baseline. Reason: viscous coupling degraded high-frequency isolation performance
Lost to a baseline
Standard continuous damping beat the metamaterial in free vibration logarithmic decrement damping ratio (0.042 vs 0.025).
Damping of Vibration Using Periodically Voided Viscoelastic Metamaterials · Virginia Tech
Lost to a baseline
Conventional motorcycle triple clamp with elastomer dampers had significantly lower daily vibration exposure A(8) across all driving profiles (0.87-4.64 m/s² vs 0.93-7.35 m/s² for particle-damped).
Auslegung partikelgedämpfter Strukturbauteile für die Additive Fertigung · Leibniz Universität Hannover Repository
Lost to a baseline
Newer transport equipment deck exhibited higher acceleration vibrations than older equipment in 28 of 32 experiments (up to 4x higher) due to lack of diagonal bracing on fixed legs.
The impact of physical stressors (noise & vibration) in a Neonatal Intensive Care Unit (NICU) in Ireland: Development of a unit-centred management guideline for the safeguarding of patients and staff · Research Repository UCD
Considered and rejected
Considered and rejected: Rejected incorporating significant structural or joint damping because it increases power requirements and provides insufficient damping cycles during high-speed dwells to eliminate vibration
Steady state vibration analysis of cam driven elastic slider crank linkage with displacement parameter variation · Iowa State
Parasitic mechanical vibrations and dynamic coupling corrupting measurement and precision systems
Uncontrolled vibrations from shakers, motors, and cooling systems transmit through mechanical assemblies and corrupt sensor measurements. These parasitic oscillations degrade optical coupling, destabilize positioning stages, and induce unphysical drift in displacement tracking.
Tried and failed
geometric alignment of mechanical actuators applied to dynamic vibration testing systems. Outcome: unstable. Reason: passive connector alignment could not suppress off-axis longitudinal and torsional parasitic oscillations
Static and dynamic characteristics of an hydrodynamic journal bearing · Cranfield
Tried and failed
colocated vibrotactile actuators and force sensors applied to handheld robotic manipulation. Reason: mechanical vibrations from haptic motors coupled into and corrupted piezoresistive force sensor readings
Exploring Visual and Haptic Feedback Systems on User Performance with a Hand-Held Robot · MIT
Lost to a baseline
Measured fiber-to-PIC edge-coupling efficiency of ~30% was ~10% lower than prior packaged module results due to angular misalignment and vibrations
Protocols and Devices for Scalable Spin-Photon Quantum Networks · MIT
Lost to a baseline
Saber saw tracking with TSLAM had higher positional error (1.58 mm) and variance compared to rotary circular saws due to oscillating motor vibrations
Augmented Carpentry: Integration of Manual Fabrication into the Digital Value Chain · EPFL
Considered and rejected
Considered and rejected: Rejected push-out testing due to micro-vibrations during horizontal sectioning that alter brittle material integrity and higher technical error rates.
Temperatureinfluss auf den Haftverbund des calciumsilikatbasierten Wurzelkanalsealers CeraSeal zum Kanalwanddentin Influence of temperature on the adhesive bond of the calcium silicate-based root canal sealer CeraSeal to the canal wall dentine · open_UMR Marburg DSpace 10.0
Tried and failed
low-temperature environmental chamber testing applied to resonant MEMS inertial sensor characterization. Reason: chamber thermal instability and cooling system vibrations induced excessive measurement noise
ADVANCED FREQUENCY OUTPUT RESONANT MEMS ACCELEROMETERS · Georgia Tech
Tried and failed
lightweight wood fixtures for subtractive CNC milling applied to heavy timber machining. Outcome: unstable. Reason: insufficient fixture stiffness led to vibrations and tool decalibration under cutting forces
Design-to-Fabrication Workflow for Raw-Sawn-Timber using Joinery Solver · EPFL
Tried and failed
LVDT displacement measurement under high-frequency cyclic loading applied to structural dynamic load testing. Reason: vibrations from high-frequency shaker corrupted sensor readings, causing unphysical directional drift
An investigation of factors affecting interface shear resistance between pipes and soils · UT Austin
Tried and failed
Belt drive mechanical vibration decoupling applied to precision spindle drive system. Outcome: worse than baseline. Reason: Belt compliance and dynamics degraded low-order surface waviness on the workpiece
Enhanced surface finishing of bearing raceways · Cranfield
Tried and failed
singular value decomposition of phase space attractors applied to multiphase flow regime identification. Outcome: no signal. Reason: measurement noise from mechanical vibration and sensor compliance corrupted attractor reconstruction
The application of signal analysis techniques based on chaos theory to flow regime identification. · Cranfield
Tried and failed
parallel link mechanism for displacement measurement applied to dynamic impact displacement tracking. Outcome: unstable. Reason: mechanism experienced large parasitic bending vibrations, corrupting the recorded displacement signal
Tried and failed
direct 3D error trajectory visualization on static surfaces applied to dynamic tracking system performance evaluation. Reason: continuous dynamic offsets, platform vibrations, and measurement noise degraded the visual signal correlation
Tried and failed
mechanomyography based joint torque estimation applied to isometric muscle contraction monitoring. Outcome: no signal. Reason: posture maintenance induced mechanical vibrations that degraded correlation with joint torque
Model predictive control for intelligent lower limb robotic assistance · Imperial
Considered and rejected
Considered and rejected: Rejected commercial LK-Instruments M102 stepper rotation stage due to severe mechanical vibration causing long-term experiment drift.
Quantum dynamics of strongly interacting BEC of molecules · DSpace-CRIS at TU Wien
Considered and rejected
Considered and rejected: Rejected mechanical air-bearing translation stages for moving the dipole trap focus due to the risk of transferring vibrations to the table and trap
Production and characterisation of dipolar Bose–Einstein condensates · Oxford
Vibration feature engineering and signal processing failing to extract reliable diagnostic indicators
Moving average filters, order selection criteria, and multiaxial vibration features often fail to isolate critical signatures from background driving noise. Sensor features also suffer from low excitation at idle speeds, drift under thermal effects, and redundancy with existing dimensionless parameters.
Tried and failed
unsupervised variance-based feature selection for baseline stability applied to vibration signals under low operational speeds. Outcome: unstable. Reason: insufficient excitation at idle and low operational speeds reduced sensor baseline feature stability
Data-Driven Structural Health Monitoring of Wind Turbine Blades under Operational and Environmental Variability · Research Repository UCD
Tried and failed
AIC order selection for periodic autoregressive models applied to mechanical vibration time series. Reason: Failed to produce reasonable or consistent model orders on empirical periodic vibration data
Statistics of AR models in relation to periodic and quasi-periodic processes · Iowa State
Tried and failed
multiaxial vibration features for machining quality prediction applied to surface roughness estimation in turning. Outcome: no signal. Reason: tangential and longitudinal vibration components lacked statistical significance compared to the radial direction
Tried and failed
adding correlated dimensionless physical parameters as inputs applied to flow-induced vibration amplitude prediction. Reason: the added parameter was redundant with an existing dimensionless damping feature and yielded negligible error reduction
Understanding flow-induced vibration via a physics-constrained, data-driven approach · MIT
Lost to a baseline
Scan-dependent vibration features achieved lower classification accuracy (38.95%-59.92%) across all window lengths compared to scan-free baseline features (56.99%-97.37%) on 28 surfaces
Instrumentation, Data, And Algorithms For Visually Understanding Haptic Surface Properties · Penn
Considered and rejected
Considered and rejected: Acoustic measurement alone was rejected because hydrophones only capture vibration noise, missing electrical loads, voltage/current, and temperature.
CONDITION-BASED UNMANNED UNDERSEA VEHICLE MAINTENANCE MONITORING AND PREDICTION SYSTEM (C-BUMMPS) · Calhoun
Considered and rejected
Considered and rejected: Rejected open-loop frequency tracking for general sensing due to thermal drift shifting resonance into flat-phase regimes and bandwidth limitation by resonator response time
Study of high-Q nanomechanical silicon nitride resonators · DSpace-CRIS at TU Wien
Considered and rejected
Considered and rejected: Rejected rigid probes for data collection because they fail to capture soft finger compliance and vibration propagation across the skin.
Toward multisensory digital interfaces · Imperial
Tried and failed
dynamic vibration DAQ for combined static-dynamic measurements applied to contact force measurement under vibration. Outcome: data insufficient. Reason: software could not record static preload offsets or stream high-resolution long-duration time-domain data
Experimental Investigation Of Non-Linear Structural Dynamics of Shrouded Turbine Blade · IRIS - POLITO - prod
Tried and failed
superimposing transverse mechanical vibrations during dynamic testing applied to rolling-sliding contact torque measurement. Outcome: no signal. Reason: average torque measurements showed no sensitivity to varying vibration amplitudes during dynamic calibration
Influence of transverse vibrations on the tribological performance of rolling-sliding contacts · Imperial
Tried and failed
time-domain moving average smoothing before spectral analysis applied to noisy mechanical vibration signals. Outcome: no signal. Reason: moving average low-pass filtered the signal without effectively isolating component signatures from driving motor noise
Data collection for vibration analysis of production assemblies · Iowa State
Considered and rejected
Considered and rejected: Rejected acceleration-based vibration metrics due to mounting location sensitivity caused by vehicle body rotational acceleration components.
Autonomous Ground Vehicle Guidance and Mapping in Challenging Terrains by using On-Board Vibration Measurements · Queens University Institutional Repository
Left open by the authors
Problems the authors named and did not get to.
Left open
Model the non-linear dynamic coupling between audio-frequency skull vibrations and high-frequency medical ultrasound harmonics using finite element simulations. Blocker: Lack of specific experimental validation protocols or defined parametric excitation models
Computational and Experimental Investigation of Human Skull Dynamics · Georgia Tech
Left open
Perform vibration analysis of inflatable wing models using the corotational nonlinear beam formulation and validate results against experimental measurements. Blocker: Requires experimental testing apparatus and physical inflatable wing specimens.
Analysis, Design, and Experimentation of Beam-Like Structures · Virginia Tech
Left open
Experimentally validate 3D thick ring electrical network damping for both in-plane and out-of-plane multimodal structural vibrations. Blocker: Requires a physical experimental testbed and hardware apparatus for 3D thick ring vibration measurement.
Multimodal Vibration Damping of Circular Symmetric Structures Coupled to an Analogous Electrical Network · Georgia Tech
Left open
Validate stall flutter versus rotating stall blade vibrations during flow separation under stall conditions. Blocker: Requires experimental compressor rig test data or specialized physical testing facilities to measure stall flutter and rotating stall vibration.
Einfluss regenerationsbedingter Varianzen auf die Aeroelastik von Verdichterblisks Aeroelastik von reparierten Axialverdichterblisks · Leibniz Universität Hannover Repository
Left open
Investigate varying airframe stiffness during taxi vibration testing and evaluate alternative operational modal analysis algorithms on the resulting data. Blocker: Requires a physical flexible airframe model and moving belt treadmill experimental apparatus for taxi vibration testing.
Experimental and Computational Investigation of a Highly Flexible Airframe Taxiing Over an Uneven Runway for Aircraft Vibration Testing · Carleton University Institutional Repository
Left open
Investigate and explain the missing fourth and sixth mode shapes in fixed-fixed lithium-ion cell vibration transmissibility measurements. Blocker: Requires raw experimental laser Doppler vibrometry data or a physical vibration testing apparatus
Ultrasonic and vibrational methods to determine changes of state of lithium-ion cells · UT Austin
Left open
Perform experimental vibration testing to validate the damage index cumulative slope difference (DICSD) method for offshore jacket structures. Blocker: Requires physical experimental jacket structure apparatus and vibration sensor testing facilities
Left open
Extend the energy balance VIV model to handle multi-modal vibration, varied riser geometry, and critical flow regimes with experimental validation. Blocker: Requires experimental hydrodynamic lab data or flow facilities for validating critical flow regimes and varied geometries
Suppression of the vortex induced vibration of slender cylindrical structures · Cranfield
Left open
Implement amplitude-dependent effective stiffness and damping formulations in the Effective Joint Region model to capture quasi-nonlinear joint behavior. Blocker: Requires experimental dynamic test data across varying excitation amplitudes for bolted joint validation.
Left open
Develop theoretical modeling and add damping/energy dissipation to suppress high-frequency oscillations in discrete point-mass network simulations on curved spaces. Blocker: None
Abstract and Physical Effects of Curvature on Dynamics of Extended Body Systems · Georgia Tech
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