By modal stiffness matrix, modal mass matrix and modal frequency, shaft units of simulator is designed. The former three steps natural characteristics are identical with the real units'.
The dynamic characteristic of linear rolling guide affected by modal frequency and modal shape was studied.
The modal frequency of the packaging structure increases with the elastic modulus of potting material.
Flexible structure is a typical form of space structure and it has the feature of low fundamental modal frequency, dense modes and low damping. This structure is apt to be vibrated when excited by disturbances. The vibration has a bad influence on precise instruments.
The transfer of shearing and moment must be considered in dynamic analysis because the model of dowel bar affects the modal frequency and modal shape directly.
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