In the first part of this investigation, a model of an active hydraulic mount was developed using the method of conic sector bounding to capture plant nonlinearities. The purpose of the mount is to make a mass that is driven by an external force and a hydraulic actuator behave as if it were a prescribed mechanical impedance driven solely by the external force. A two-degree-of-freedom control system, that consists of a feedback controller and a prefilter, is proposed as a solution. A position-velocity-acceleration (PVA) feedback controller using classical root locus methods and an H2-optimal feedback controller are designed using the plant model. A prefilter is then used to prescribe the mechanical impedance of the mount. The performance of these control systems is investigated in the frequency domain using Robust Control Theory. Finally, numerical simulations of a high-fidelity nonlinear model are used to assess the performance of each controller in the time domain.

P. M.
, and
C. P.
, “
Choosing the Best Conic Sector Bounds to Capture System Nonlinearity
Proceedings of the 1994 ASME IMECE
, DSC-Vol.
, pp.
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Palazzolo, J. J., 1994, “Design of an Active Hydraulic Mount with Programmable Mechanical Impedance,” Master of Science Thesis, Department of Mechanical Engineering, Michigan State University, East Lansing, MI.
Watton, J., 1989, Fluid Power Systems—Modeling, Simulation, and Microcomputer Control, Prentice-Hall, NJ.
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