Fu Yuan, Li Shusen, Liu Jiuqing, Zhao Bo
School of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150080, China.
Key Lab of Ultra-Precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150080, China.
Sensors (Basel). 2021 Mar 10;21(6):1941. doi: 10.3390/s21061941.
The vibration isolation system is now indispensable to high-precision instruments and equipment, which can provide a low vibration environment to ensure performance. However, the disturbance with variable frequency poses a challenge to the vibration isolation system, resulting in precision reduction of dynamic modeling. This paper presents a velocity self-sensing method and experimental verification of a vibration isolation system. A self-sensing actuator is designed to isolate the vibration with varying frequencies according to the dynamic vibration absorber structure. The mechanical structure of the actuator is illustrated, and the dynamic model is derived. Then a self-sensing method is proposed to adjust the anti-resonance frequency of the system without velocity sensors, which can also reduce the complexity of the system and prevent the disturbance transmitting along the cables. The self-sensing controller is constructed to track the variable frequency of the disturbance. A prototype of the isolation system equipped with velocity sensors is developed for the experiment. The experiment results show that the closed-loop transmissibility is less than -5 dB in the whole frequency rand and is less than -40 dB around, adding anti-resonance frequency which can be adjusted from 0 Hz to initial anti-resonance frequency. The disturbance amplitude of the payload can be suppressed to 10%.
隔振系统对于高精度仪器和设备而言不可或缺，它能够提供低振动环境以确保性能。然而，变频干扰给隔振系统带来了挑战，导致动态建模精度降低。本文提出了一种隔振系统的速度自感知方法及实验验证。设计了一种自感知执行器，根据动力吸振器结构来隔离不同频率的振动。阐述了该执行器的机械结构，并推导了其动态模型。接着提出一种自感知方法，无需速度传感器即可调整系统的反共振频率，这还能降低系统复杂度并防止干扰沿电缆传输。构建自感知控制器以跟踪干扰的变频情况。开发了配备速度传感器的隔振系统原型用于实验。实验结果表明，在整个频率范围内闭环传递率小于 -5 dB，在添加可从0 Hz调整至初始反共振频率的反共振频率附近小于 -40 dB。有效载荷的干扰幅度可被抑制至10%。
