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Research on semi-active vibration isolation system based on electromagnetic spring

机译：基于电磁弹簧的半主动减振系统研究

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This paper proposes a semi-active variable stiffness vibration isolation system based on electromagnetic spring for the low-frequency vibration isolation of mass-varying objects. It is achieved by four straight leaf springs in parallel to an electromagnetic spring system composed of a single electromagnet and a permanent magnet. The equivalent magnetic circuit method is used to compute electromagnetic force of the electromagnetic spring system, and mathematical model of the semi-active vibration isolation system is established according to Maxwell's equations. The nonlinear mathematical model is linearized at the equilibrium point by using the Taylor series expansion theorem to establish linear state-space representation of the system, and then using the traditional PID control method, a double closed-loop feedback control system of the inner current loop and outer location loop is designed. By controlling the current in the coil, the equivalent stiffness and electromagnetic force of the system are variable to achieve semi-active control. Furthermore, the control block diagram of the semi-active vibration isolation system is built based on Simulink software, then make a simulation analysis to the vibration isolation performance of the system and compare the effects of vibration isolation with inner current loop control and without inner current loop control, respectively. Finally, the experiments prove the correctness of the theory. It concludes that this semi-active vibration isolation system is a vibration isolation system with broad application prospects, which has fast current response, high vibration isolation efficiency, and an excellent vibration isolation effect for the low-frequency disturbance of mass-varying objects.
机译：本文提出了一种基于电磁弹簧的半主动变刚度隔离系统，用于质量变化物体的低频振动隔离。通过四个直叶平行于由单个电磁铁和永磁体构成的电磁弹簧系统实现的。等效磁路方法用于计算电磁弹簧系统的电磁力，并且根据麦克斯韦方程式建立半主动振动隔离系统的数学模型。非线性数学模型通过使用泰勒序列扩展定理在平衡点线性化，以建立系统的线性状态空间表示，然后使用传统的PID控制方法，内部电流回路的双闭环反馈控制系统设计了外部位置环。通过控制线圈中的电流，系统的等效刚度和电磁力是可变的，以实现半主动控制。此外，基于Simulink软件构建了半主动减振系统的控制框图，然后对系统的振动隔离性能进行了仿真分析，并比较了振动隔离与内部电流回路控制的影响，而没有内部电流循环控制分别。最后，实验证明了理论的正确性。它的结论是，该半主动隔振系统是具有广泛应用前景的振动隔离系统，具有快速的电流响应，高振动隔离效率，以及对质量变化物体的低频扰动的优异振动隔振效果。

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