According to the SPWM directly area equivalent algorithmic based on DSP, we design and realize an frequencyconversion experimental system First we analysis the principle of the algorithmic Then we discuss the software flow based on DSP At the end we present some experiment waves to validate the design based on the hardwar

After the theoretical imitating and demonstrating , we bring up the design according to the SPWM directly area equivalent algorithmic based on DSP.

The iterative method is added into direct integral method to analyze forced vibration problem of laminated composite shallow shells while the relative formulas are derived.

So direct integral method based on displacement model is brought o ut.

A new function-transformation method is proposed and four kinds of explicit exact solitary wave solutions of the Lienard equation, the generalized PC equation, the important nonlinear wave equation in mechanics, which have a fifth-order stronger nonlinear term, are obtained by a combination of the function-transformation method and the direct integral method.

Analysis of stable reliability for sluice based on direct numerical integration;

the direct numerical integration method was applied to obtain the steady state response of mechanisms with elastic links.

Then solving the equation by using Neumann series direct integration method.

The basic idea of the direct integration method for calculating the structural reliability is introduced in detail and a computer programming for this purpose is developed.

This paper employed the finite element method of dynamic problems as well as the theoretical and numerical solutions of mode superposition method and direct integration method to analyze the motion characteristics of the equipment.