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Separation of time variant vibration sources by short time coherent output power

机译：通过短时相干输出功率分离时变振动源

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摘要

This effort describes the use of time variant coherence causality based analysis to separate the effects of nonstationary time variant vibration excitation sources. A time variant coherence function using the Short Time Fourier Transform (STFT) is first discussed. The concept of a time variant coherent output power for source separation of systems with time variant transfer functions is developed. A parametric study is performed to examine the coherent output power separation capabilities with respect to the data processing parameters. The study guided the selection of the time-frequency processing parameters judged to provide a suitable compromise between the time event localization and output amplitude source separation. The time variant coherent output power is then applied to separate the effects of the two possible excitation sources on the prototype vibration isolation floor. The application was a subscale prototype isolation floor for a proposed vibration sensitive equipment site adjacent to a busy freight rail line. The moving train created time variant transmission paths. As there was a direct line of sight between the prototype floor and the rail line there was an airborne acoustic excitation path in addition to a ground path. The short time coherent output power was applied to separate prototype isolation floor vibration into respective components related to the two candidate sources. The analysis and discussion of the results focuses upon the interpretation and issues in such a complicated realistic environment. Ultimately the application was successful providing an explanation as to why the observed vibration isolation was degraded at higher frequencies.
机译：此工作描述了使用基于时变相干因果关系的分析来分离非平稳时变振动激励源的影响。首先讨论使用短时傅立叶变换（STFT）的时变相干函数。提出了时变相干输出功率的概念，用于具有时变传递函数的系统的源分离。进行参数研究以检查相对于数据处理参数的相干输出功率分离能力。该研究指导了时频处理参数的选择，这些参数经判断可在时间事件定位和输出幅度源分离之间提供适当的折衷。然后施加时变相干输出功率，以分离两种可能的激励源对原型隔振地板的影响。该应用是拟议中的振动敏感设备现场的地下隔离原型地板，该现场靠近繁忙的货运铁路线。行驶中的火车创建了时变传输路径。由于原型地板和铁路线之间有直接的视线，因此除了地面路径外，还有一条机载声激励路径。短时相干输出功率用于将原型隔振地板振动分成与两个候选源相关的各个分量。结果的分析和讨论着重于在如此复杂的现实环境中的解释和问题。最终，该应用程序成功地提供了解释，说明了为什么在较高的频率下观察到的隔振性能会下降。

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