Prof. Rajendra Singh
Director, NSF I/UCRC Smart Vehicle Concepts Center, Ohio State University
February 17, 2015 | 12:30 to 01:30 | 540 Cory Hall
Host: John Huggins
Direct measurement of dynamic forces is not practical in many real-life applications because the interfacial conditions may change. Thus indirect force estimation methods must be developed, though they pose special difficulty for nonlinear mechanical elements since the transfer path type methods are applicable only for linear systems. The first example considers the hydraulic engine mount as a dynamic load sensor as this device is inherently nonlinear (with spectrally-varying and amplitude-sensitive parameters). The proposed methods for estimating force transmitted to the mount base correlate well with measured forces on a laboratory experiment (simulating a powertrain system under harmonic excitation). The second example examines the role of angular contact ball bearings as a vibration transmitter in rotating mechanical systems. The dynamic effects of bearing preloads are experimentally and analytically investigated for a vehicle wheel bearing assembly. The bearing stiffness matrix of dimension 5 is successfully evaluated and validated using experimental and computational mechanics methods. Finally, this seminar will provide an overview of the NSF Smart Vehicle Concepts Center.
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