Approach for Calibrated Measurement of the Frequency Response for Characterization of Compliant Interface Elements on Vibration Test Benches
Approach for Calibrated Measurement of the Frequency Response for Characterization of Compliant Interface Elements on Vibration Test Benches
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DOI：
10.3390/app11209604
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发表时间：
2021-10
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影响因子：
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通讯作者：
E. Heyden;A. Lindenmann;S. Matthiesen;D. Krause
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文献类型：
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作者：
E. Heyden;A. Lindenmann;S. Matthiesen;D. Krause
在振动试验中，结构的行为取决于它的机械边界条件，这些边界条件在物理试验中由具有机械性能的连接单元来表示。可调阻抗元件是在振动试验台上完成可调连接任务的机械元件，因此具有多种特性。它们的机械性能必须在比文献中测试的可比柔顺结构更大的范围内已知。本文致力于可调阻抗元件本身的振动测试，考虑了试验台的夹具和测量装置的影响。在液压和电动试验台上对自由振动的质量块采用了不同的频率响应函数测量方法。质量抵消和与频率相关的测量系统功能在表征手臂模型的生物动力学响应方面已经显示出它们的有效性。将这种测量方法推广到机械零件上，在更广泛的试验条件下获得可靠的结果。论证了对不同的自由振动质量和两个不同试验台上的两个柔顺元件进行动态校准频率响应函数测量的必要性，以便在广泛的测试条件下提供结果。
In vibration tests, the behavior of the structure depends on its mechanical boundary conditions, which are represented in physical tests by connecting elements with mechanical properties. Adjustable impedance elements are machine elements fulfilling the task of an adjustable connection on a vibration test bench and therefore represent a variety of properties. Their mechanical properties must be known over wider ranges than comparable compliant structures tested in the literature. This paper is dedicated to vibration testing of the adjustable impedance elements themselves, taking the influences of fixtures and measuring devices of the test bench into account. Different approaches for measuring the frequency response functions are applied to freely vibrating masses at a hydraulic and an electrodynamic test bench. Mass cancellation and the frequency-dependent measurement systems function have shown their usefulness in characterizing the biodynamic response of hand–arm models before. This measurement method is extended to be transferable to machine elements to obtain reliable results under a wider range of test conditions. The necessity for dynamically calibrated measurement of the frequency response functions is demonstrated for different free vibration masses and for two compliant elements on two different test benches to provide results over a wide range of test conditions.