Oil pan shoulder function due to the uniqueness of oil cooling, so the oil pan was semi-damping enwrapped in the experimentation , The results showed a piece of sound power level lower 1.

The governing equations of a beam with electro-magnetic constrained damping layers(EMCLD)are derived based on Hamilton Principle and simulated,which indicates the control current and thickness of damping layer how to affect the control results,and verifies EMCLD with simply configuration,reasonable actuated manner and low energy consumption,to be effective for active vibration control.

The shear strains in visoelastic damping layers resulting from the attraction arrangement magnets at the constraining layers end are higher than that in the conventional passive constrained damping layer(PCLD).

Beam element model analysis of composite beam with constrained damping layer;

Secondly with non-damping layers,free damping layers and constrained damping layers,the oil pan noise radiation is analyzed.

To cut down element number for modeling structure with constrained damping layer(CDL) in general FEM software,the whole element method is adopted to solve the extension,bending and torsion vibration of the hollow circular beam with CDL.

This paper discusses using restricted damped absorber in field of reducing vibration by method analysis and project application,and forom the view of power flow analysises the result of vibration reduction by using restricted damped beam has the ability of reducing vibration and absorbing energy with wide frequency band and high effect.