It is pointed out that the existence of residual sound of a piano is mainly determined by damp vibration of the string.

At the same time, it discusses the effect of vibration damping coefficient on resonance, and concludes that wire rope rod is easier to form overstroke during production, furthermore,it explains why the pumping efficiency of wire rope rod pumping system is higher and also gives explanation to some questions and puzzles that exist in current research and application of.

The interlaminar stresses and experiment research of viscoelastic laminated plates for damping vibration;

An experiment of damped vibration using a computer mouse as data collector;

This essary quantitative analyse energy in damped vibration and steady forced vibration each other time.

By means of this method,we study nonlinear damped oscillation and obtain the relation between the velocity and displacement for nonlinear damped oscillation.

Using software MATLAB,the solution of damped vibration of A2B model is solved;the damped oscillation pattern is discussed.

The motion of a type of nonlinear damped oscillation is analyzed to resort the method of numerical analysis,and compared it with the motion of the linear damped oscillation.