Research Thrust Area
Structural Dynamics, VibroAcoustics and Controls
Structural Sciences Center Info Exchange
September 1, 2005
Department of Mechanical, Industrial and Nuclear Engineering
Research Thrust Area Mission
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Mission: Develop, Investigate and Evaluate
Experimental and Analytical Approaches to the
Estimation of the Dynamic Properties of Structural
Systems and the Solution of Structural Dynamics
Problems
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Vibrations/Structural Dynamics, System Dynamics
Acoustics/Noise, Vibro-Acoustics
Vibration-Acoustic Interactions
Nonlinear Systems
Structural Health, Damage Detection/Prognosis
Department of Mechanical, Industrial and Nuclear Engineering
Research Labs/Consortia
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Structural Dynamics Research (UC-SDRL)
Vibro-Acoustics and Sound Quality Research Lab
Intelligent Maintenance Systems Center (NSF
I/UCRC)
Smart Structures and Nano-Material Research
Smart Materials Nanotechnology Research
Computer Aided Engineering Research
Center for Robotics Research
Center for Intelligent Maintenance Systems
Hypoid/Bevel Gear Mesh and Dynamic Modeling
Consortium
Department of Mechanical, Industrial and Nuclear Engineering
MINE Faculty
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R. Allemang (Structural Dynamics)
D. Brown (Structural Dynamics)
E. Hall (Robotics)
R. Huston (Dynamics)
J. Kim (Vibro-Acoustics, Dynamics)
J. Lee (Diagnostics, Prognostics)
T. Lim (Vibro-Acoustics, Structural Dynamics)
Y. Liu (FE, BE, Solid Mechanics)
D. Qian (FE, Solid Mechnics)
A. Phillips (Computational Methods, System Simulation)
R. Rost (Structural Dynamics)
M. Schultz (Smart Structures)
D. Thompson (Controls)
K. Vemaganti (FE, Solid Mechanics)
Department of Mechanical, Industrial and Nuclear Engineering
Unique History (40+ Years)
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Machine Tool Testing Focus (1960-1970)
Automotive Testing Focus (1970-1980)
Infrastructure Testing Focus (1974-1978)
Aircraft/Spacecraft Testing Focus (1980Present)
Automotive Testing Focus (1992-Present)
Infrastructure Testing Focus (1992-Present)
Experimental Non-Linear Dynamics Modeling (1998Present)
Department of Mechanical, Industrial and Nuclear Engineering
Unique Experimental Facilities
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Multi-Channel Data Acquisition
High Bay Laboratory
Isolation Foundations
Excitation Systems
Anechoic Chamber
Rotating Equipment Test Cell (Spin Pit)
Sound Quality Lab
Gear Dynamics Lab
Department of Mechanical, Industrial and Nuclear Engineering
Unique Experimental Facilities
Nonlinear Dynamics Test Facility
Department of Mechanical, Industrial and Nuclear Engineering
Research Expertise
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Arrayed Measurement Methods
Acceleration Sensor Arrays (MIMO FRFs)
– Acoustic Sensor Arrays (Nearfield Acoustic Holography)
– Force Sensor Arrays (6 DOF Load Cell)
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Experimental Modal Analysis
MIMO FRF Simulation with Non-Linearities
– Optimal Sensor/Exciter/Actuator Placement
– Modal Parameter Estimation
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Data Acquisition/Analysis on Rotating Systems
Impedance/Modal Modeling
Test/Analysis Correlation, Model Updating
Department of Mechanical, Industrial and Nuclear Engineering
Research Expertise
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Discrete Modal Filtering
Active Control of Structures
Operating Deflection Shape Analysis
Flight Flutter Analysis
Machine Dynamics Simulation
Automotive NVH
Experimental Non-Linear Dynamics Modeling
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Support from Ohio Board of Regents
Damage Detection/Prognosis
Structural Health Monitoring
Department of Mechanical, Industrial and Nuclear Engineering
Research Expertise
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Nano and MEMS Technology Sensing (Nano-Skin)
Multi-Scale Modeling
Adaptive Modeling
Modeling of Composite Materials
Contact Stress Analysis Modeling (Gears, Tires)
Nonlinear FE Analysis
Parallel FE Analysis (Cluster Computing)
Performance Monitoring, Feature Extraction
Department of Mechanical, Industrial and Nuclear Engineering
Current Thrust Area Targets
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Structural Health Monitoring
Damage Detection/Prognosis
Experimental Modeling (Linear) with Statistical
Bounds
Experimental Identification of Nonlinear systems
Dynamic Modeling in Combined Environments
Department of Mechanical, Industrial and Nuclear Engineering
Relative Past Research Activities
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Optimum Ground Vibration Testing
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Modal Parameter Estimation
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1980-1983, USAF-Eglin AFB
Experimental Modal Analysis and Dynamics Component
Synthesis
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1978-1980, NASA-LRC
MIMO FRF Modal Analysis
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1978-1980, USAF, The Boeing Company
1983-1988, USAF-WPAFB
Experiments in Multivariable Identification and Control
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1989-1990, NASA-LRC
Department of Mechanical, Industrial and Nuclear Engineering
Relative Past Research Activities
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Ground Vibration and Flight Flutter Technology
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On-Line Parameter Estimation Methods
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1996-1999, Ohio Board of Regents, OSU
Experimental Modal and Impedance Modeling of Structures
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1991-1993, NASA-Ames University Consortium
Advanced Instrumentation for Machinery Acoustics and
Vibrations Research
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1991-2005, The Boeing Company
2002-2003, The Goodyear Company
Shock/Vibration Testing of Penetrator Fuze
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2004, General Dynamics
Department of Mechanical, Industrial and Nuclear Engineering
Current PhD Research
Non-Linear Modeling Example
554 με
307 με
213 με
133 με
1.E+06
1.E+05
1.E+04
367 με
253 με
174 με
Increasing Load
PSD (με2/Hz)
1.E+03
1.E+02
1.E+01
1.E+00
1.E-01
1.E-02
1.E-03
Aircraft panel fatigued due to acoustic loading
or ‘Sonic Fatigue’
1.E-04
0
200
400
600
800
Frequency (Hz)
1000 1200
Response of an aircraft panel to random acoustic loading
Department of Mechanical, Industrial and Nuclear Engineering
Discussion / Questions?
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Contact:
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Randall Allemang, PhD
Professor of Mechanical Engineering
593 Rhodes Hall, UC
Cincinnati, Ohio 45221-0072
513-556-2725
Randall.Allemang@UC.EDU
Department of Mechanical, Industrial and Nuclear Engineering