Study on the Dynamic Properties of Cross-legged Parallel Machine Tool;

Geometrical error models of a parallel kinematics machine tool(PKM) on the basis of structural character of cross-legged are built by the differential vector method.

The code of the responsible unit to assemble the crossing bar is recorded through adding the seal lock, so as to have the inspection and repair unit pay atten- tion to the inspection and repair quality of the cross- ing bars.

The dynamic force of the crossing bar of the K6 Bogie used in the 20,000 ton heavy-duty train in Da-Qin Railroad is identified in two methods:the material mechanic method and the quasi-static method.

By the computer simulation and numerical calculation, not only have the free vibrating modals of the crossing bar been obtained, but also the dynamic characteristics of the crossing bar have been recognized while the car negotiates on curves and runs on straight railway with stochastic excitation.

By analyzing the wiper of the Benz E320 Car, in designing the drive of the wiper, use of the cross rod should provide for angles designed for the wiper advance and return movement, use of the crank rod should be increased for scouring the field of view by keeping dimensions of the brush.

A new type of speed-up wagons equipped with type K2 bogie and 8G bogie developed and manufactured by QRRS were found to some extent, collapsing and cracks due to the quality issues on some of the frame braced devices of both two types of bogies during the fatigue test of the complete car and actual operating.