In order to set up the special relationship between the model body and the original body in simulation of construction or material deformation,the conception of sub-coupled system as well as differential work principle and variational principle of the system in elasticity are presented.

This paper presents an energy principle,zero different work principle of coupled systems in photoelaticity, from which potential energy, complementary energy, generalized potential energy and generalized complementary energy vari-ational principles of the coupled systems in photoelasticity are derived.

Stochastic principle of virtual work and stochastic finite element method for viscoelastic structural analysis;

Based on the principle of virtual work, this paper deals with elastic plastic FEM(Finite Element Methods) of sheet metal stamping process, and then this method is introduced into related analysis processes.

In the end, the average hydraulic pressure of bulging is given by the principle of virtual work.

The creactive design of mechanism in the process of mechanical scheme based on function principle;

Analysis of the function principle in the creactive design of product by the cigarette automatic machine's design and the evaluation of the cigarette automatic machine's creative design scheme,help to get a good principle scheme.

Utilizing the designing method of systematic functional principle and creation theory,the design of principle scheme has been carried out for the mechanical system of production line of thin piece punching from coiled materials.

This paper has better given some explains of mechanism of swing swaying more and more higher in the air by functional principle.

The functional principle and key technology of each part was described in detail.