The plunger is forced to undergo a simple harmonic vibration parallel to the direction of the tube.
活塞在平行于长管的方向被迫作合谐摆动。
According to the cycle formula of simple harmonic vibration, the cycle formula of simple pendulum could be figured out.
根据简谐运动的周期公式，得到单摆的周期公式。
Under the simple harmonic vibration, the stable forced vibration of multiple-degree-of-freedom system is analysed by using ANSYS software.
运用ANSYS软件分析多自由度系统在简谐激励作用下的稳态受迫振动。
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