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首页> 外文期刊>Journal of Sound and Vibration >Uninterrupted and accelerated vibrational fatigue testing with simultaneous monitoring of the natural frequency and damping
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Uninterrupted and accelerated vibrational fatigue testing with simultaneous monitoring of the natural frequency and damping

机译：不间断和加速的振动疲劳测试，同时监测固有频率和阻尼

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摘要

A mechanical systems modal parameters change when fatigue loading is applied to the system. In order to perform an accelerated vibration-based fatigue test these changes must be taken into account in order to maintain constant-stress loading. This paper presents an improved accelerated fatigue-testing methodology based on the dynamic response of the test specimen to the harmonic excitation in the near-resonant area with simultaneous monitoring of the modal parameters. The measurements of the phase angle and the stress amplitude in the fatigue zone are used for the real-time adjustment of the excitation signal according to the changes in the specimens modal parameters. The presented methodology ensures a constant load level throughout the fatigue process until the final failure occurs. With the proposed testing methodology it is possible to obtain a S-N point of the Woehler curve relatively quickly and to simultaneously monitor the changes of the specimens natural frequency and damping loss factor. The presented methodology with real-time control is verified on an aluminum Y-shaped specimen (10 ~6 load cycles are achieved in 21 min) and is applicable to a specimen with arbitrary geometry. Besides the faster completion of the fatigue test the methodology can be adopted for the validation of the vibrational fatigue analysis.
机译：当系统施加疲劳载荷时，机械系统的模态参数会发生变化。为了进行基于振动的加速疲劳测试，必须考虑这些变化，以保持恒定的应力负载。本文提出了一种改进的加速疲劳测试方法，该方法基于试样对近共振区域中谐波激励的动态响应，同时监测模态参数。根据样品模态参数的变化，将疲劳区中的相角和应力幅值的测量值用于激励信号的实时调整。所提出的方法可确保在整个疲劳过程中保持恒定的载荷水平，直到发生最终故障为止。利用所提出的测试方法，可以相对较快地获得Woehler曲线的S-N点，并且可以同时监测样品的固有频率和阻尼损耗因数的变化。本文提出的具有实时控制的方法在铝制Y形试样上进行了验证（在21分钟内达到10〜6个载荷循环），适用于具有任意几何形状的试样。除了可以更快地完成疲劳测试之外，还可以采用该方法来验证振动疲劳分析。

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