It is shown that the offset of propulsion force and the lower natural fundamental frequency are caused by asymmetry of turbopump and weakness of connection stiffness between propulsion and frame.
研究表明，涡轮泵不对称以及发动机与机架之间连接刚度弱是引起推力偏心和基频固有频率偏低的主要原因。
At first the method for calculating the fundamental natural frequency of structure is researched.
首先研究了结构的最低阶固有频率的计算方法。
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