激励力对木材振动阻尼系数的影响

Effect of Excitation Force on Wood Vibration Damping Coefficient

为探究激励水平对木材振动阻尼系数测定结果的影响规律,应用快速傅立叶变换频谱分析方法(FFT),采用铅芯折断产生激励的方式,测定了2.95、2.48、2.23、1.89、1.22、0.76 N等6个激励水平的对数平均值、对数回归斜率、指数函数拟合3种阻尼系数,并分析了激励水平对振动阻尼的影响。结果表明:激励力的大小会影响木材振动阻尼系数的结果,随着激励力的增大,木材振动阻尼系数呈现减小的变化规律,两者之间呈现显著线性负相关。

In order to investigate the influence of the excitation on the results of wood vibration-damping coefficient,with the fast Fourier transform(FFT)spectrum analysis method by breaking a lead core to produce an excitation,three damping coefficients of logarithmic mean value,logarithmic regression slope and exponential function fitting were measured at 2.95,2.48,2.23,1.89,1.22 and 0.76 N under six different excitation levels,and the effect of excitation force on vibration damping was analyzed.The magnitude of the excitation force affects the vibration damping coefficient of the wood.With the increase of the excitation force,the damping coefficient of the wood vibration decreases,and there is a significant linear negative correlation between them.