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首页> 外文期刊>Acta astronautica >Implementation and application of digitally controlled piezoelectric vibration absorbers to truss structures
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Implementation and application of digitally controlled piezoelectric vibration absorbers to truss structures

机译：数控压电减振器在桁架结构中的实现与应用

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The aim of this study involves implementing adaptive PVAs by adjusting their characteristics in orbit. Specifically, the results of the study focus on the implementation of digitally controlled PVAs and demonstrate their performance in vibration control. Digital potentiometers are used to improve the ease of tuning the PVA characteristics. We derived empirical formulae to estimate the characteristics of PVAs and implemented PVAs in which natural frequency and damping ratio are designated in the microcomputer. The formulae corresponded well with the theoretical values. Additionally, we simulated the transmission of vibration to the observation equipment with the truss structure and performed vibration control experiments. The truss structure was composed of five bays. Two electromagnets fixed on the uppermost nodes excited the truss structure with a swept sine wave. Four PVAs were equipped on the lowermost nodes for vibration. We measured the mode shapes and obtained a natural frequency of 16.38 Hz corresponding to a fundamental mode such as beam bending. Based on the results, we conducted vibration control experiments under the condition with a natural frequency of 16.38 Hz and optimum damping ratio of 0.07530. The results confirmed that PVAs could reduce the peak value of frequency response at least by 2 dB. Furthermore, we derived the transfer function from the mode and natural frequency and compared this function with the experimental results. The results clearly indicated that digitally controlled PVA worked effectively and suppressed the vibration of truss structures.
机译：这项研究的目的包括通过调整其在轨道上的特性来实施自适应PVA。具体而言，研究结果集中于数字控制的PVA的实施，并证明了其在振动控制中的性能。数字电位器用于提高调整PVA特性的简便性。我们导出了经验公式来估算PVA的特性，并实现了在微型计算机中指定了固有频率和阻尼比的PVA。这些公式与理论值非常吻合。此外，我们模拟了振动向具有桁架结构的观测设备的传播，并进行了振动控制实验。桁架结构由五个海湾组成。固定在最上层节点上的两个电磁体以正弦波激励了桁架结构。最下面的节点上装有四个PVA，用于振动。我们测量了模态形状，并获得了与基本模态（如光束弯曲）相对应的16.38 Hz固有频率。根据结果​​，在自然频率为16.38 Hz，最佳阻尼比为0.07530的条件下进行了振动控制实验。结果证实，PVA可以将频率响应的峰值至少降低2 dB。此外，我们从模式和固有频率推导了传递函数，并将该函数与实验结果进行了比较。结果清楚地表明，数控PVA有效地发挥了作用，并抑制了桁架结构的振动。

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