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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：数字控制压电振动吸收器的实施与应用桁架结构

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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：本研究的目的涉及通过调整轨道中的特征来实现自适应PVA。具体而言，研究结果侧重于数字控制的PVA的实施，并在振动控制中展示其性能。数字电位计用于改善调整PVA特性的易于调整。我们衍生的经验公式来估计PVA的特性和实施的PVA，其中在微型计算机中指定固有频率和阻尼比。公式对应于理论值良好。另外，我们用桁架结构模拟向观察设备的振动传递并进行振动控制实验。桁架结构由五个海湾组成。两个电磁铁固定在最上面的节点上，激发桁架结构与扫过的正弦波。在最下节点上配备了四个PVA以进行振动。我们测量了模式形状并获得了与诸如光束弯曲的基本模式的16.38Hz的自然频率。基于结果，我们在固有频率为16.38Hz的条件下进行了振动控制实验，最佳阻尼比为0.07530。结果证实，PVA可以至少减小频率响应的峰值至少2dB。此外，我们从模式和自然频率衍生传递函数，并将其与实验结果进行了比较。结果清楚地表明，数字控制的PVA有效地工作并抑制了桁架结构的振动。

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