Study on torsional vibration frequency of board spring sawblade strain system of band-saw mill;

Study on ultrasonic torsional vibration and equivalent circuit of thin annular resonator;

Analysis of torsional vibration of a spur gear system with faults;

Research on the mechanical model and natural frequencies of torsion vibration of the rod string of screw production systems;

Discussion for the influence on downhole temperature on torsion vibration natural frequencies of drill strings;

Study on torsion vibration of vehicle power train;

The twisting vibration characteristic analysis of the sucker rod string for progressing cavity pump oil production system;

On the basis of the analysis of the twisting vibration of rotary sucher-rod string, a formula of calculating every harmonic vibration eigenfrequency is presented.

The paper introduces the main noise resource of the setting of motor and pump,the usual connection manner of mo- tor and pump and proposes the connection manner used in the paper;also it analyzes and simulates the twisting vibration of the axes.

Study and simulation of active twist smart rotor frequency range;

The active twist blade tip smart rotor is tested in wing tunnel for the first time in china.

In order to study the aeroelastic characteristics and vibration reduction mechanism of active twistblade,analytical model of laminated composite beam with bending-torsion coupling attached piezoelectricelements on both surfaces is built based on high order plate theory.

The twist-related locomotion function was firstly solved, and simplified to be expressed by sine or cosine functions.