无阻尼自由振动 undamped free vibration ; non damping free vibration
有阻尼自由振动 free vibration of damped system
无阻尼自由振动情形 free vibration of undamped system
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并从实际出发，考虑砧下垫层的弹性作用及垫层和土壤的阻尼作用，建立了锻锤振动系统的双自由度有阻尼振动力学模型。
In the last part of this paragraph, a calculation model for forging hammer foundation vibration system with dual-freedom is presented.
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模块上移
模块下移
不移动