Abstract
Active hydraulic mounts with an inertia track, decoupler membrane, and oscillating coil actuator (AHM-IT-DM-OCAs) have been studied extensively due their compact structure and large damping in the low-frequency band. This paper focuses on a comprehensive analysis of the active and passive dynamics and their fixed points in mid-low-frequency bands, which will be helpful for parameter identification. A unified lumped parameter mechanical model with two degrees-of-freedom is established. The inertia and damping forces of the decoupler/actuator mover may be neglected, and a nonlinear mathematical model can be obtained for mid-low-frequency bands. Theoretical analysis of active and passive dynamics for fluid-filled state reveals the amplitude dependence and a fixed point in passive dynamic stiffness in-phase or active real-frequency characteristics. The amplitude dependence of local loss at the fluid channel entrance and outlet induces the amplitude-dependent dynamics. The amplitude-dependent dynamics constitute a precondition for fixed points. A single fixed point in passive dynamics is experimentally validated, and a pair of fixed points in active dynamics for an AHM-IT-DM-OCA is newly revealed in an experiment, which presents a new issue for further analysis.
Highlights
Fixed points are common phenomena in mechanical vibrations theory and practices.They often appear in frequency-response functions (FRFs) of damped systems and have rich physical meanings and wide applications
Passive Dynamics rubber materials between the previously tested passive hydraulic mount with inertia track (PHM-IT) and newly tested PHM-IT-DM, The analysis shows that the distinct feature of the passive dynamics of Active Hydraulic Mount (AHM)-ITthe parameter values are different, as are the fixed points
The analysis shows that thebeen distinct features of active dynamics of AHM-IT-DM-OCAs thatthe the paired fixed points have beendemonstrated demonstrated experimental results
Summary
Fixed points are common phenomena in mechanical vibrations theory and practices. They often appear in frequency-response functions (FRFs) of damped systems and have rich physical meanings and wide applications. A pair of fixed points, P and Q in a damped dynamic absorber, has become a classic case in the research and application concerning fixed points, which have played a huge role in vibration engineering. Based on the study of distinct features in the dynamics of PHM-IT [5], the active and passive dynamic characteristics of active hydraulic mounts with an inertia track, decoupler membrane, and oscillating coil actuator (AHM-IT-DM-OCAs) are studied in this paper. The working mechanism of AHM-IT-DM-OCA can be understood either from the perspective of the actuator actively reducing the force transmitted to the vehicle body or from the perspective of the actuator actively adjusting the dynamic characteristics of the hydraulic mount. (a) for PHM-IT-DM and AHM-IT-DM-OCA. (a) PHM-IT-DM; 1. rubber bellow; 2. lower chamber; 3. inertia track; 4. decoupler membrane; 5. upper chamber; 6. main rubber spring; 7
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