Hanger isolators are the critical components of automobile exhaust system, and its static and dynamic elastic characteristics affect directly performance of vibration isolation. The static and dynamic elastic characteristics of a typical hanger isolator was investigated by using nonlinear Finite Element Method. Finite element model of the hanger isolator was established first, then suitable constitutive equations selected, static and dynamic elastic characteristics simulated and static stiffness of the hanger isolator in calculated. Under the sinusoidal excitation at different frequency the dynamic stiffness and damping angle were calculated by cross-power spectrum through dynamic simulation. Finally, the structure of the hanger isolator was optimized by orthogonal experiment to enhance performance of the isolator.

Based on the variational theory, the amended Reynolds equation of water guide bearing in turbulent regime is transformed to functional extreme value problem. Using the products of weight function and linear interpolation function as pressure function, onedimensional finite element algorithm for calculating load force and its Jacobi matrix is proposed. The umerical results show that this method can reduce the computing time remarkably with the precision guaranteed.