以下为句子列表：
英文: During past year, 28 times of measurements for two units of B plant of Zhelin hydropower station were made , the states of pressure pulsation in the draft cone tube, head cover and spiral case of units were acquired under different water heads, and the in
中文: 摘要在长达一年多的时间里，对柘林水电厂B厂两台机组进行了28台次试验，全面掌握了机组各水头下尾水锥管、顶盖和涡壳中的压力脉动情况，以及对机组安全稳定运行的影响。
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英文: The accumulator in the jig alternating-flow hydraulic system is very important to increase efficiency, reduce pressure pulsation and keep the system having a good dynamic process.
中文: 摘要蓄能器是跳汰机系统的重要组成部分，对于提高效率、减少压力波动、保证系统有良好的动态过程具有重要作用。
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英文: The problem of noise of the fan is studied with the non-linear theory, and pressure pulsation of axial flow fan's inside flow was measured by dynamic pressure sensor, the gas-structure coupled noise of contra-rotating axial flow fan was studied through a
中文: 摘要用非线性动力学的理论对风机噪声问题进行了分析，同时运用实验手段测量了轴流风机流场内部流动的压力脉动，从全新的角度研究了对旋风机的气固耦合噪声。
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