This article through research telehandler, in the front wheel changes, the four wheel steering to change three kinds with the crab shape to change in the situation the revolver and the right wheel ideal corner relations, unifies in the vehicles curve process two wheel actual corner relations, has established the steering trapezium organization optimization design model.

Optimum design of steering trapezium in tractor;

Analysis of Slope Plane Position of Trapezoid Leaf of Tapered Leaf Springs;

The paper introduces a modified trapezoid acceleration pattern with a constant speed part for loomrapier motion driven by cam.

The critical water depth of open channels with trapezoid cross sections and smooth slopes is calculated with a weighted approximation method.

Study of supporting characteristics of arc terrace metallic support in roadway;

In order to meet the varied requirement of roadway support,the metallic arc-terrace support is newly developed.

Based on the gray assembles, the trapezium gray analysis is presented, and it is applied to environmental quality assessment.

Approximate calculating definite integrals by rectangular method,trapezoidal method and parabolic method are considered under some weaker condition and best estimatons of errors are obtained.

Besides,the trapezoidal method and parabolic method is used to make approximate calcalation and error estimate of the integral.