Driving at resonance point of multi-degree-of-freedom system by decentralized control (Excitation of natural vibration in the large degree of freedom and large damping system by local feedback control and cross feedback control)
Driving at resonance point of multi-degree-of-freedom system by decentralized control (Excitation of natural vibration in the large degree of freedom and large damping system by local feedback control and cross feedback control)
复制标题
分散控制多自由度系统共振点驱动（通过局部反馈控制和交叉反馈控制激发大自由度大阻尼系统的固有振动）
DOI：
10.1299/transjsme.19-00422
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Daiki Uehara
中科院分区：
文献类型：
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作者：
Takashi Tanaka;Y. Kurita;Y. Oura;Daiki Uehara
大自由度、大阻尼振动系统的共振点驱动由于固有频率拥挤和传递特性增益峰值下降而变得困难。为了解决这个问题，多点励磁是有效的。集中控制作为多点励磁的通用控制方法，是调节所有执行器的幅值和频率以及相邻执行器之间的相位差以适应固有振动的模态形状的方法。因此，掌握固有振动的固有频率、振型是必要的。本文提出将所提出的分散控制扩展到大自由度和大阻尼振动系统。首先阐述了大自由度、大阻尼振动系统共振点采用集中控制和常规分散控制驱动的难点。自激振动是在环路传递函数具有最高峰值增益的频率处产生的。在固有频率拥挤的情况下，该方法只能激发特定的固有振动。其次，交叉反馈控制是为了激发任意的固有振动。固有振动的相位调整模态形状被反馈到相邻的执行器。最后验证了阻尼元件对环境引起的阻尼变化的适应性。局部反馈控制作为主动阻尼控制，减少了环路传递函数中系统阻尼的影响。结果，系统的振幅保持不变，以抵抗阻尼的增加。
Driving at resonance point of the large degree of freedom and large damping vibration system is difficult because of crowd of natural frequencies and decreased peak of gain of transfer characteristics. To solve this problem, the multi-point excitation is effective. Centralized control as the general control method for multi-point excitation is the method to adjust the amplitude and frequency of all actuators and the phase difference between the adjacent actuators to suit modal shape of natural vibration. Therefore, to grasp the natural frequency, vibration mode of natural vibration is necessary. In this paper, the expansion to the large degree of freedom and large damping vibration system of the proposed decentralized control is proposed. Firstly, the difficulty of the driving at resonance point of large degree of freedom and large damping vibration system by centralized control and conventional decentralized control is explain. The self-excited vibration is generated at the frequency that has the highest peak gain of a loop transfer function. In the condition of crowd of natural frequencies, this method can excite only the particular natural vibration. Secondary, the cross feedback control is to excite the arbitrary natural vibration. The phase adjusting modal shape of natural vibration is fed back to adjacent actuator. Lastly, the adaptability for the change of damping caused by environment using damping element is verified. The influence of damping of the system in a loop transfer function is decrease by local feedback control as the active damping control. As the result, the amplitude of system maintains against the increase of damping.