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APPLICATION OF ACOUSTIC IMPULSE RESPONSE IN DIAGNOSTIC TESTS OF ROTOR BLADE IN STATIONARY CONDITIONS

机译：声脉冲响应在静止状态转子叶片诊断测试中的应用

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摘要

A modified vibroacoustic method for the detection and observation of changes in the structural parameters of rotor blade in stationary conditions is presented in the paper. The modification of the method is connected with the excitation of the blade at two points and with the new specific method of vibroacoustic signals analysis. The signal processing has been enriched with new elements, which are based on some parameters of an analytical form of the auto-correlation function and power spectral density function. A new function has been worked out in the form of the quotient of the power spectral density functions of acoustic response signals due to blade excitation at two thoroughly described points. Parameters of the new function present useful information for the evaluation of changes in the technical state of the blade. The characteristic feature of this information is that in the unchanged conditions in which the analysis is conducted (the fixed signal of excitation, unchanged conditions of the blade support at the test stand), it can be obtained from two measurable output signals and is highly sensitive to damage. The suggested approach to the evaluation of changes in the structure of a rotating machinery element such as an axial-flow compressor blade reveals strong sensitivity of changes of the newly determined function parameters to the typical damage of the blade of this type.
机译：本文提出了一种改进的振动声学方法，用于检测和观察静止状态下转子叶片结构参数的变化。该方法的修改与在两个点处激励叶片和振动声信号分析的新的特定方法有关。基于自相关函数和功率谱密度函数的解析形式的某些参数，信号处理已经丰富了新的元素。由于在两个详尽描述的点处的叶片激励，已经以声学响应信号的功率谱密度函数的商的形式制定了新函数。新功能的参数为评估叶片技术状态的变化提供了有用的信息。该信息的特征在于，在进行分析的条件不变的情况下（励磁的固定信号，在试验台上刀片支撑的条件不变），可以从两个可测量的输出信号中获得该信息，并且该信息高度敏感损坏。评估旋转机械元件（例如轴流式压缩机叶片）的结构变化的建议方法表明，新确定的功能参数变化对此类叶片的典型损坏具有强烈的敏感性。

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