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你好,world! Liam 07/22/2018 \begin{equation}x^n+y^n=z^n\end{equation} $$\frac{{\partial \frac{{\partial L}}{{\partial \left( {\frac{{\partial {x_i}}}{{\partial {a_k}}}} \right)}}\partial {x_i}}}{{\partial {a_k}\partial L}} = \frac{{\partial \frac{{\partial L}}{{\partial {a_k}}}\partial {x_i}}}{{\partial \left( {\frac{{\partial {x_i}}}{{\partial {a_k}}}} \right)\partial L}} = \frac{{\partial \frac{{\partial L}}{{\partial L}}\partial {a_k}}}{{\partial \left( {\frac{{\partial {x_i}}}{{\partial {x_i}}}} \right)\partial {a_k}}} = 1$$ 1. 一个简单弹簧振子,质点质量为m,弹簧劲度系数为K,力阻为R。在外力f(t)作用下振动。 (1)写出振子的(位移)传递函数、格林函数,力学品质因素和力阻抗,以及受迫振动时的一般解。\vbox{}位移的频谱等于力的频谱乘以传递函数:\[x(t) = \mathscr{F}^{-1}H(\omega)\mathscr{F}f(t)\]传递函数:\[ H(\omega) = \frac{1}{-m\omega^2-i\omega R +K}…

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