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Abstract: The dynamic characteristics of hydraulic engine mounts (HEMs) with different lengths of inertia tracks are studied experimentally. It is revealed for the first time that the frequency-dependent dynamic characteristics of the HEM with inertia track under different excitation amplitudes have fixed points. Then a nonlinear lumped parameter model (LPM) for HEMs with inertia track is developed based on the theory of engineering hydromechanics, in which the parameters are associated with the geometry of hydraulic mechanisms, and an analytical solution is obtained, in which the fixed point on the dynamic stiffness in-phase as a function of excitation frequency and amplitude is discovered theoretically. The reliable consistency between analytical and experimental results shows the validity of the LPM
and the correctness of the analytical conclusions. Based on the fact that the analytical conclusions matches well with the experimental ones and according to the phenomena of the fixed point and the constant value at higher bands of the dynamic stiffness in-phase, a new parameter identification method is presented, which is clear in theory and is time- and cost-saving, and the identified results are reliable.
Key words: Hydraulic engine mount
Dynamic characteristics
Lumped parameter model
Parameter identification
Powerplant Vibration isolation
CLC No: U464.1 TB123 TH113
国家教育部博士点科研基金(98000321)和清华大学基础研究基金资助项目. Received 20060922, received in revised form 20070102
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