This paper studied the effects of the unload gradient which attained from the forcestroke curve and the system rigidity that included equipment and die on vibration and noise in blanking.

Further revealed the main points and methods of manufacture to solve the system rigidity problem in the small hole grinding.

Prediction of stiffness coefficient of short-fiber reinforced composites;

Selection methods on damping coefficient,stiffness coefficient and time step in granular distinct element method;

The formulas, for calculating the equivalent flexural rigidity of helical cutting tube, and stiffness coefficient at the bottom of spindle inner tube were derived.

By solving flexibility and stiffness factor,this paper presents element stiffness matrix of parabolic wedge-shaped beam with rectangular section in cross-beam structures.

By solving flexibility and stiffness factor,this paper presents element stiffness matrix of parabolic wedge-shaped beam of rectangular section in plane frame structure.

In terms of the characteristics of grid-beam,the stiffness factor formula was established,which provided theoretical basis for calculating the deflection of grid-beam.

The planar micro-spring is commonly used in MEMS, the rigidity coefficient of the spring changes with the structural form of the spring.