Abstract

An analysis from the results of investigation into spatial active damping of pressure fluctuations, vibrations, and vibration forces transferred from power facilities via expansion joints in their piping is presented. Vibration transfer from power facilities via piping can be several orders of magnitude greater than along the support structures. This fact should be kept in mind in designing vibration isolation of power equipment from the foundation and the environment through pipelines in the power and transport engineering, shipbuilding, and in oil and gas pipelines in pumping stations. To reduce the transfer of vibrations via a pipeline by means of vibration-isolating expansion joints, it is necessary to decrease their structural stiffness and the forces induced by fluctuations of the working fluid pressure in an expansion joint in a wide frequency band using structural or active methods. A review of the available publications has not revealed, except for the studies performed within the scope of this investigation, any analysis of the interaction between the fluid fluctuations and vibration in the expansion joints or information on reducing the transfer of vibrations and pressure fluctuations via expansion joints in liquid-carrying pipelines. The effectiveness of various multichannel spatial active vibration protection systems whose feedback circuit includes regulators in the form of standard band-pass filters has been studied experimentally. The effect that the interaction of active vibration force damping channels has on the damping efficiency, which may be caused by the cross sensitivity of three-component vibration force sensors during damping of the vibration forces, has been revealed. The active spatial vibration damping of a pipeline downstream of the expansion joint has also demonstrated the interaction of active vibration damping channels resulting in a noticeable change in the damping effectiveness. The effectiveness of the investigated options varied from 10 to 32 dB (reducing fluctuations, transfer of vibration, and forces transmission by 3–30 times) both at individual frequencies and in frequency bands in the range between 10 and 500 Hz.

中文翻译：

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通过充液管道中的膨胀节传递的振动、振动力和压力波动的空间主动阻尼

摘要

对压力波动、振动和通过管道中的膨胀节从电力设施传递的振动力的空间主动阻尼的调查结果进行了分析。通过管道从电力设施传递的振动可能比沿支撑结构传递的振动大几个数量级。在电力和运输工程、造船和泵站油气管道中，设计动力设备与基础和环境之间的隔振时应牢记这一事实。为了通过隔振膨胀节减少管道中的振动传递，有必要使用结构或主动方法在宽频带内降低其结构刚度和由膨胀节中工作流体压力波动引起的力。除了在本调查范围内进行的研究外，对现有出版物的审查没有揭示对膨胀节中流体波动和振动之间相互作用的任何分析或关于通过膨胀减少振动和压力波动的传递的信息液体输送管道中的接头。已经通过实验研究了反馈电路包括标准带通滤波器形式的调节器的各种多通道空间主动振动保护系统的有效性。已经揭示了主动振动力阻尼通道的相互作用对阻尼效率的影响，这可能是由三分量振动力传感器在振动力阻尼过程中的交叉敏感性引起的。膨胀节下游管道的主动空间减振也证明了主动减振通道的相互作用导致阻尼效果的显着变化。在单个频率和 10 到 500 Hz 范围内的频带中，所研究选项的有效性从 10 到 32 dB（将波动、振动传递和力传输减少 3-30 倍）不等。这可能是由三分量振动力传感器在振动力衰减期间的交叉敏感性引起的。膨胀节下游管道的主动空间减振也证明了主动减振通道的相互作用导致阻尼效果的显着变化。在单个频率和 10 到 500 Hz 范围内的频带中，所研究选项的有效性从 10 到 32 dB（将波动、振动传递和力传输减少 3-30 倍）不等。这可能是由三分量振动力传感器在振动力衰减期间的交叉敏感性引起的。膨胀节下游管道的主动空间减振也证明了主动减振通道的相互作用导致阻尼效果的显着变化。在单个频率和 10 到 500 Hz 范围内的频带中，所研究选项的有效性从 10 到 32 dB（将波动、振动传递和力传输减少 3-30 倍）不等。膨胀节下游管道的主动空间减振也证明了主动减振通道的相互作用导致阻尼效果的显着变化。在单个频率和 10 到 500 Hz 范围内的频带中，所研究选项的有效性从 10 到 32 dB（将波动、振动传递和力传输减少 3-30 倍）不等。膨胀节下游管道的主动空间减振也证明了主动减振通道的相互作用导致阻尼效果的显着变化。在单个频率和 10 到 500 Hz 范围内的频带中，所研究选项的有效性从 10 到 32 dB（将波动、振动传递和力传输减少 3-30 倍）不等。