本文在实验基础上建立了弹性匀质木杆有阻尼自由振动的数学—力学模型,并从能量的角度研究了木杆的振动问题。从理论上导出了阻尼力耗损能量的计算式,并得出了各次频振动的能量分布及杆上各点的振动规律。对于平行于纤维方向的红松木杆,测试结果表明:可认为杆内部阻尼与振动速度成正比;基频振动耗损贮存杆内弹性势能的97.3％,基频振动频率f_l=9.875 l/s;衰减常数β=2.31 l/s。 In this paper, a mathematical-mechanical model of damped free vibration of elastic homogeneous wood is established on the basis of experiments, and the vibration of wood is studied from the energy point of view. The calculation formula of energy loss of damping force is derived theoretically, and the energy distribution of each frequency vibration and the vibration law of each point on the rod are obtained. The test results show that the internal damping of the rod is proportional to the vibration velocity. The fundamental vibration consumes 97.3% of the elastic potential energy in the storage rod, the fundamental vibration frequency f_l = 9.875 l / s. The attenuation Constant β = 2.31 l / s.