The rollover stability is one of the most important aspects of the buses\' securities and usually appraised by the maximum rollover stability angle.

Analysis of the Maximum Static Stable Roll Angle of the Vehicle and the Sensitivity of the Main Influence Factor;

With the background of lateral stability of non-range-spacer through bowstring arch, analytical approxima-tions are derived in this paper using energy variational approach.

Using energy method,the general formula for calculation of lateral stability of through bowstring tied arch bridge without transverse beams given.

Based on the machining principle analysis of the nature ruled surfaces, the technologies of NC programming for intricate nature ruled surfaces by wire-EDM were studied, including the profile marking standard, the algorithm of seeking corresponding points, equal-error synchro-linear approximation of profiles and the method to calculate the maximum inclining angle of ruling.

In this paper, by the motion analysis of four-axis wire-Electric Discharge Machining (WEDM) machine tools, it is concluded that, during the machining of intricate ruled surfaces only with linear boundary curves, the maximum inclining angle of the wire and the maximum displacements of the machining table and the wire guiding head occur on the vertices of the boundary lines.

Simulation and analysis of roll stability for heavy tractor semi-trailers;

The research sets up a heavy tractor semi-trailer dynamic model and puts forward an active roll control algorithm based on optimal control for the vehicle roll stability control.

The research was made for setting up dynamic model of heavy tractor semi-trailers,inclusive of simulating roll stability with the steering step input.