Mark J. Schulz
Department of Mechanical,
Industrial, and Nuclear Engineering
University of Cincinnati
P.O. Box 210072, Cincinnati,
DR. SCHULZS research interests include structural control,
integrating mechanical design and control, structural optimization, model correction, structural health monitoring,
and nonlinear control. he has developed various Eigenstructure Assignment techniques for
Mechanical Systems. these techniques are used to suppress vibration with active control,
correct analytical structural models, and to optimize structural design. He also has industrial experience
performing mechanical design, vibration, and stress analyses on many defense projects.
this experience includes the analysis and design of composite radomes and reflectors,
servo stabilization simulations for gimbaled antennas, vehicle response to nuclear weapon
effects, and jitter analyses of space-based laser mirrors.
The current research of Dr. Schulz and his students at the Structural
Mechanics and Control Research Laboratory is in the following areas:
||Structural Health Monitoring: Vibrometry techniques are being used to
detect invisible delamination in composite materials and cracks in the interior of
metallic structures. Experimentation is being performed using a transmittance function
monitoring technique to accurately detect, locate, and quantify damage via changes in the
vibration signature of the structure. This is a global method of non-destructive
evaluation that can detect damage far away from a sensor location. An eight-channel DP-402
FIT analyzer and signal processing toolboxes in MATLAB are used to compute damage
indicator values for the test structure. Structural health monitoring can extend the life
of aging aircraft and civil infrastructure.
||Nonlinear Design and Control: Efficient numerical algorithms and
nonlinear control techniques are being developed to optimize the design of highly-flexible
nonlinear. structures to reduce weight, suppress vibration, and increase fatigue life.
Algorithms written using MATLAB and SIMULINK are downloaded into a Space controller and
experiments are performed using piezoceramic "smart materials" for vibration
||Modeling and Damage Detection of Composite Repaired Structures:
Composite repair is used to patch cracks in aging aircraft and civil structures. Finite
element modeling in MSC/ NASTRAN is used to characterize debonding of the patch and crack
progression by analyzing the vibration signature of the structure. A goal is to develop an
autonomous health monitoring system for repaired and new structures.
||Automobile Crashworthiness Research: The crashworthiness of automobiles
is being studied using large deformation finite element models and the LS-DYNA3D code. A
deformable barrier analytical model is being verified to reduce the cost of simulating and
performing vehicle collisions.