This article made a systematic study for measuring methods of extensional wave velocities using flexural and longitudinal resonance vibrations, and improved traditional measuring equipment arrangement of longitudinal resonance vibration.

The analysis of velocity fluctuation inspatial 4 - link mechanism RSS P;

The experimental results show that the significant velocity fluctuation and the maximum velocity might occur in the vicinity of the liquid surface with relativity low liquid Reynolds number.

Tests for motion feasibility,loading capacity and velocity fluctuation are conducted separately.

Computer simulation of influence of flexible belt drive on speed fluctuation;

Parametric control of speed fluctuation minimization in cam mechanism;

Taking 3NB—1000 friplex drilling pump as an example, the paper also discuses and analyes the speed fluctuation and torgue fluctuation of the crank in all kinds of working conditions, points out that the change of certain favourable working co.

To measure the vibration caused by the random speed fluctuations superimposed on the constant speed,this paper discusses the dynamic characteristics of the rolling mill s drive system when the elastic driving shaft and motor shaft had speed oscillation,and an instantaneous speed measurement model of rolling mill s drive system was established.