When the support spring stiffness gets larger and larger, the rigidbodymode characteristic will diminish as the flexible characteristic becomes more pronounced.
当支持弹簧刚度变得越来越大时，随着弹性体属性变得越来越突出，刚体模态属性将减少。
2
When the springs supporting the beam are very soft, then the mode shape for the beam looks very much like a rigidbody.
当支撑梁的弹簧非常软时，梁的模态振型看起来非常像刚体。
3
A new model reduction method for dynamic analysis of complex structures based on Quasi-Rigid-Bodymode and Flexibility Modification is presented.