两自在度系统：自在振动和受迫振动；
Two degrees of freedom systems: free vibration and forced vibration;
在有限元应用，就有可能取得额外的内部菌株的自在度。
In a finite element application, it is possible to derive the internal strains from additional degrees of freedom.
机忻魅振动 （2学分） 内容撮要： 单自在度系统：自在振动、有阻尼受迫振动和无阻尼受迫振动；
Mechanical vibration (2 credits) Summary: The single degree of freedom systems: free vibration, forced vibration damped and forced vibration damping;
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