A Study on the Dynamic Performance for Hydraulically Damped Rubber Bushings with Multiple Inertia Tracks and Orifices: Parameter Identification and Modeling

Abstract

Hydraulically damped rubber bushings (HDBs) are important for vehicle noise, vibration, and harshness (NVH) performance as they are able to decay the vehicle’s oscillation induced by engine and road. The dynamic stiffness and loss angle of an HDB are crucial and it is significant to investigate the relations between the design parameters with the dynamic stiffness and loss angle. Therefore, the force-deflection relation of the HDB is measured statically and the dynamic stiffness and loss angle are measured dynamically and the test data are analyzed with a view to examine how the measurement results are influenced by the design parameters (the number of the fluid tracks). Compared with the results predicted by a nonlinear lumped parameter model whose parameters are extracted by a parameter identification technique, using the model, the effect of the main rubber and the fluid track on the dynamic stiffness and the loss angle is investigated. A unified analytical model of HDB is also developed with the purpose of predicting the static and dynamic characteristics, and the predictions are shown to be well correlated with the measurement data. The good correlation suggests the validity of the model and the parameter identification implementation.

Complex stiffness model of an air spring with auxiliary chamber considering inertial effects of gas in connecting pipeline

“…According to Bernoulli equation for nonstationary flow, 19 the momentum equation of the air in the connecting pipe is yielded as follows:…”

Modeling and dynamic analysis of hydraulic damping rubber mount for cab under larger amplitude excitation

“…According to Eqs. (18)(19)(20), the experimental datum cane be processed. Finally, the experimental results are shown in Fig.…”

“…The dynamic stiffness and the calculation method of its hysteresis angle are deduced, and the formula of peak frequency of hysteresis angle is also given. The literature [18] has studied the relationship between design parameters of a hydraulic suspension system and dynamic stiffness, hysteresis angle. And by parameter identification technique, the nonlinear lumped parameter model is established and the influences of fluid track on the dynamic characteristics of the system are analyzed.…”

Generalized Liquid-Based Damping Device for Passive Vibration Control

“…Model 17is analogous to the models used for hydraulic engine mounts and suspension bushing, e.g. [25], [44], [45]. Model (18) represents the extended form of the single-state damper model [10] augmented with an inertia-sensitive channel.…”

“…[24], and systems with advanced internal architectures, e.g. [25], were considered. Moreover, inertial and compressibility effects can be important in all fluid-based damping and spring system models, e.g.…”