直到2009年夏天，这一问题被发现是由于转向动力系统的高压管路生锈引起的。

By summer 2009, it had found that the problem was caused by rust forming inside a high-pressure pipe in the power steering system.

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通过测试200 MN油压机液压系统表明动力流体和管路的耦合振动是液压系统主要的振动源。

By testing the hydraulic system of 200mn press, it is shown that the coupling vibration of power fluid and pipeline is the main vibration source of the system.

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本文用传递矩阵的方法建立了描述往复泵—管路液力系统流体动力特性方程，井导出了各子系统的传递矩阵。

This paper establishes a fluid dynamic equation for a reciprocating pump-piping hydraulic system with the transfer matrix method and deduces all the transfer matrixes of the subsystems.

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