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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 91
Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros
Paper 258

A Fluid-Structure Interaction Analysis of a Hydraulically Damped Rubber Mount

L.R. Wang1,2, Q. Zhang3, Z.H. Lu4 and I. Hagiwara1

1Department of Mechanical Science and Engineering, Tokyo Institute of Technology, Japan
2Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, P.R. of China
3Ansys Inc., Canonsburg, United States of America
4Department of Automotive Engineering, State Key Lab of Automotive Safety and Energy, Tsinghua University, Beijing, China

Full Bibliographic Reference for this paper
L.R. Wang, Q. Zhang, Z.H. Lu, I. Hagiwara, "A Fluid-Structure Interaction Analysis of a Hydraulically Damped Rubber Mount", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 258, 2009. doi:10.4203/ccp.91.258
Keywords: engine mount, hydraulically damped rubber mount, fluid-structure interaction, finite element.

Hydraulically damped rubber mounts (HDM) have been widely equipped in vehicle powertrain mounting systems (PMS). Their frequency- and amplitude-dependent dynamic characteristics can more effectively attenuate vibrations transmitted between the powertrain and the body-chassis. In HDM, complex fluid-structure interaction (FSI) between the fluid-rubber spring, the fluid-uncoupler membrane and the fluid-lower diaphragm are essential to its vibration isolation performance.

The finite element (FE) method of FSI has been studied in the computational fluid and structure mechanics fields since the 1970s. After the 1990s, great progress was made with the Arbitrary-Lagrangian-Eulerian (ALE) mesh control technology, including a stable algorithm for the fluid FE computation, a numerical method for coupled FE formulation of the FSI and a mesh method for the fluid-structure interface. The ALE mesh technology can effectively control mesh distortion and avoid computational failure in the large deformation of the fluid field.

In this paper, a strong coupling FE method to solve the fully coupled problem of FSI is first developed. The FE formulation of the fluid field is set up based on the ALE formulation for a barotropic fluid. A displacement-pressure FE formulation of the rubber field is set up in a Lagrangian description based on a hyperelastic constitutive for an incompressible rubber material. Strong coupling of the FE formulation and the FSI is established by combining the FE formulations of rubber and fluid fields according to geometrical compatible and equilibrium conditions on the fluid-rubber interface (FRI). Furthermore, the HDM working process simulation and characteristic prediction are studied based on the strong coupling FE method. A typical kind of HDM in a vehicle powertrain mounting system, which is composed of rubber spring, two fluid chambers, fluid track and decoupler membrane, is selected to investigate the working process prediction of HDM.

The fully coupled FRI analysis presented for the HDM on the basis of the proposed strong coupling FE method of FRI can help engineers to predict, redesign and reanalyze characteristics in development of computer aided technology of HDM. The success of strong coupling FE method in solving fluid-large deformation rubber interaction of HDM shows prospect to solve many other fluid-structure interaction problems in engineering by using FE method.

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