Special Topics in Structural Dynamics & Experimental Techniques, Vol. 5

Front Cover	1
Conference Proceedings of the Society for Experimental Mechanics Series	2
Special Topics in Structural Dynamics & Experimental Techniques, Vol. 5	4
Preface	6
Contents	8
Using Mode Shapes from Cell Phone Videos for Machinery Health Monitoring	10
Rotating Machine	10
Introduction	10
Artificial Intelligence (or Machine Learning)	11
TWFs & DFTs	13
ODS-FRFs	13
Law of the FFT	14
Aliased Order Peaks	14
Curve Fitting the ODS-FRFs	15
Mode Shapes at Monitored Points	15
Damping Removal	15
FaCTsTM	16
Baseline Case	17
Conclusions	19
Rotordynamic Analysis of the Turbopump Using Superelement Approach	20
Introduction	20
Background	21
Methodology	23
Rotordynamic Model with Fixed Bearing Stiffness	23
Superelement Generation	25
Rotordynamic Model including Stator Flexibility	26
Conclusion	29
Metamaterial-Based Vibration Mitigation for Enhanced Reliability of an Automotive Inverter: A Numerical Study	30
Introduction	30
Problem Definition	31
LRM Solution And Single Tuned Vibration Absorber: Comparison	32
LRM Solution: Unit Cell Modeling And Comparison	34
LRM Implementation On The Real Component	38
Conclusions	39
Test-vs-Simulation Correlation of Noise Emission in a Bent-Axis Pump	42
Introduction	42
Overview of the NVH Workflow	43
Excitation Stage	43
Vibration Response	43
Acoustics	43
Experimental Set-up	44
Test Data Interpretation	46
Preliminary Results Comparison and discussions	46
Future Work	46
A Brief Review of Robotic Welding Technology for Structural Steel Applications	48
Introduction	48
Robotic Welding	50
Wall-Climbing Robots and Sensor Technologies	50
Overview of Mobile Robots in the Market	52
Mobile Welding Robots	52
Mobile Robots in Diverse Sectors	52
LiDAR-Equipped Mobile Robots	53
Challenges and Discussion	53
Conclusions	55
Bridging Minds and AI for Enhanced Autonomous Driving	58
Introduction	58
Background	59
Analysis	60
Physiological signals and driver behavior	60
Conclusion	61
Rotordynamic Influence of Balance Pistons with Combined Axial and Radial Flow	62
Introduction	62
Revised Annular Seal and Bearing Test Rig	64
Results and Discussion Numerical Setup	67
Campbell Diagram Influence of Different Levels of Modelling the Dynamics of the Annulus	68
Stability Analysis	72
Summary & Conclusion	72
CRediT Authorship Contribution Statement	73
Investigating the Propulsive Efficiency of Bio-Inspired Fish-like Elastic Caudal Fin through Dynamic Analysis and Experimental Validation	74
Introduction	74
Mathematical Evaluation of Bio-Propulsion Efficiency	75
Experimental Setup	75
Characterization of Propulsion System's Material Properties	75
Experimental Identification of Dry and WET Fin's Frequency	76
Numerical and Experimental Results	77
Final Remarks	79
Bandgap Design of Metamaterial Structures by Varying Local Resonator Properties	80
Introduction	80
Modeling of Metamaterial Structure	81
Analysis of Bandgap Properties	81
Bandgap width approximation via Bloch's theorem	82
Bandgap width calculation via transmissibility	82
Results of Bandgap Design	83
Conclusion	85
Experimental Investigation of the Damping Effect of Inherent Particle Damping Under Centrifugal Load	88
Introduction	88
Experimental Methodology and Analysis	89
Conclusion	91
Greedy Source Placement Optimization for MIMO Control of Ground-Based Vibration Tests	94
Introduction	94
Background and Methodology	95
Example Problem	97
MIQP Greedy Search Comparison	98
Greedy OED Performance on Full-Scale Model	100
Conclusion	102
Design and Testing of Vibroacoustic Metamaterials for Active Damping of Traffic Noises	104
Introduction	104
Materials and Methods	105
Unit cell design 1: Active VAMM	106
Unit cell design 2: Passive VAMM	106
Experimental characterization	106
Analysis	106
Experimental validation of the active VAMM	106
Experimental validation of the passive VAMM	108
Discussion of application of passive and active VAMM in traffic noise control	109
Conclusion	109
pyFBS: A Python Package for Frequency Based Substructuring and Transfer Path Analysis	112
Introduction	112
Theoretical background and notation	113
Numerical case study	114
Conclusions	117
Non-contact Video-based Heart Rate Monitoring using Hilbert Motion Magnification	118
Introduction	118
Theory	119
Principal components analysis	120
Blind source separation	120
Complexity pursuit	121
Experimental results	121
Conclusion	123
Variable Atwood Number Rayleigh-Taylor InstabilitiesInduced by Volumetric Energy Deposition	126
Introduction	126
Methods	127
Fluid Selection	127
Experimental Setup	128
Single-Fluid Calibration Procedure	128
Rayleigh-Taylor Mixing Experiment Procedure	129
Image Processing	130
Results	131
Single-Fluid Calibration	131
VED Mixing Experiment	132
Discussion	134
Conclusions	134
Identification of Linear Time-variant Rotor Components in Resonance Crossing Experimental Validation	136
Introduction	136
Test Rig	137
Modal Identification Of The Beam In Stationary Condition	138
Modal Identification Of The Beam In Transient And Time Variant Condition	138
Conclusion	139
Efficient Simulation of Soft Tissue for Human, Robotics, and Exoskeleton Applications	140
Introduction	140
Simplified Model Of A Human Lower Limb	141
Results	141
Conclusion	142
Piezo Elements to Improve Dynamic Response of Load Cells	144
Introduction	144
Finite Element Model	145
Finite Element Results and Negative Capacitance Implementation	147
Shunt Circuit	147
Negative Capacitance Optimisation	148
Experimental Tests	148
Experimental Results	150
Conclusion	152
Monitoring the Interface Behaviour of Bolted Joints	154
Introduction	154
Materials and Methods	155
Results	156
Conclusion	158

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