A Study on Shortcomings of Mechanical Model with Lumped Mass for Dynamic Characterization of Hydraulic Mounts and Confirmation of Hydraulic Model by Improvement of Experimentations

Hydraulic mounts show strong1y frequency-dependent stiffness and damping characteristics in low frequency range, which result from so called inertia track dynamics. A lumped mass has been incorporated in several mechanical models of the literature to take the inertia effect of the fluid in the track into consideration. Although complex s%illness by the mechanical model showed good agreements with the measured values, there exists a critical pitfall. In this paper, the shortcomings of mechanical models with lumped mass for hydraulic founts are clearly identified by illustrating actual measurements of the stiffness parameters for a hydraulic mount. It is conclusively discussed that the inertia effect of the fluid flow through the circular track is significant but latent. As an alternative to the mechanical model, a hydraulic model is claimed to be used for further dynamic analysis of engine/mount system or whole car system.

유체 봉입 마운트의 동적 특성화를 위한 집중질량 요소를 갖는 기계적 모형의 문제점 파악과 실험 방법 개선을 통한 수력학적 모형의 타당성 확인