What Vibration & Damping Analysis got wrong, from 56 theses

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 · PhD

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 · PhD

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 · PhD

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 · University of Marburg · PhD

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 · PhD

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 · PhD

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 · PhD

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 · PhD

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 · TU Wien · PhD

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 · Queen's University · Master's

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 · PhD

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

Experimental and modelling investigation of the mechanical behaviour of chocolate at quasi-static and elevated strain rates · Imperial · PhD

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 · Doctorate

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 · Master's

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 · PhD

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

Impedance shaping for whole-system small-signal stability enhancement via co-operation between Grid and IBR operators · Imperial · PhD

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 · Master's

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 · Master's

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 · Master's

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 · Master's

Tried and failed

passive eddy-current damping applied to mechanical vibration isolation. Outcome: worse than baseline. Reason: viscous coupling degraded high-frequency isolation performance

Development of Precision, Field-Deployable, Opto-Mechanical Instrumentation: Accessibility as a Functional Requirement · MIT · PhD

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 · Master's

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 · PhD

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 · PhD

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 · University College Dublin · PhD

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 · PhD

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. · Politecnico di Torino · PhD

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 · Nottingham · PhD

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 · PhD

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 · PhD

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 · Politecnico di Torino · PhD

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 · University College Dublin · PhD

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 · University College Dublin · PhD

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 · PhD

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 · PhD

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 · Doctorate

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 · PhD

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 · PhD

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 · PhD

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 · PhD

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 · PhD

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 · PhD

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

Novel Rheometric Techniques and Constitutive Models for Linear and Nonlinear Rheology: Applications to Polymeric Solutions and Colloidal Gels · MIT · PhD

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

A numerical study on mechanical properties of low-density two-dimensional networks of crosslinked long fibers · UT Austin · PhD

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 · PhD

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 · PhD

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 · Politecnico di Torino · PhD

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 · University at Buffalo · PhD

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 · PhD

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 · PhD

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 · PhD

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

Nonlinear Phononics: Modeling Light-matter Interactions for Ultrafast Control of Materials Properties · Cornell · PhD

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 · PhD

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 · PhD

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 · PhD

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

Cracking the Case of Antarctic Ice Shelf Rifting · Harvard · PhD

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

Predicting material damping in composite blades - a novel low order approach and experimental validation · Imperial · PhD

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 · Politecnico di Torino · PhD

Considered and rejected

Considered and rejected: Rejected roving hammer testing for characterising input damping parameters due to rigid body motion and suspension friction.

Predicting material damping in composite blades - a novel low order approach and experimental validation · Imperial · PhD

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 · PhD

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 · PhD

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 · PhD

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 · Doctorate

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 · PhD

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 · Master's

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 · PhD

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

Reliability as a metric for structural health monitoring systems performance: application on fixed jacket offshore structures · Cranfield · PhD

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.

Imaging the dynamics of complex connections: advancing modeling and experimental methods for bolted joints with digital image correlation · Boston University · PhD

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 · PhD

Left open

Optimize the x1 regularity assumptions and eliminate the small epsilon parameter in linear inviscid damping estimates for capillary gravity water waves. Blocker: Requires advanced mathematical fluid dynamics and PDE theoretical analysis rather than software engineering tools.

CAPILLARY GRAVITY WATER WAVE LINEARIZED AT MONOTONE SHEAR FLOWS: EIGENVALUE AND INVISCID DAMPING · Georgia Tech · PhD