On the assumption that diesel engine was a rigid body,the effect of stiffness of engine foundation on vibration intensity was analyzed and a conclusion was drawn that the smaller stiffness was,the greater rigid displacement of the engine was.

Finite element method analysis of rotating blade with consideration of the coupling of rigid body motion and elastic motion;

By now,such applications have been focused on adopting the Grassmannian structure,the spinor and twist representations of rigid body motions.

After introducing the basic knowledge of geometric algebra such as outer product,inner product and geometric product,this paper focused on the CGA description and computation with graphic reflection,rotation,translation,rigid body motion and screw motion,and gave the experimental demonstrations.

During the pretension process of flexible cablestrut structures,rigid-body motion and elastic deflection occur simultaneously,which cannot be solved with traditional Finite-Element-Method.

The theory of rigid-body motion for a ship on waves has been improved.

In order to overcome this defect and obtain an efficient method,it has provided a schame to solve 3D assembly constraints based on the motion of rigid body in analytic geometry.