Vibration Suppression Of Civil Structures Based On Mechatronic Inerter

As a double-ended mass element,the inerter can provide a "virtual mass" far greater than its own mass in the motion system;The mechatronic inerter,as a new type of inerter,has the advantages of larger inerter/mass ratio,small size,and easy miniaturization compared to the traditional mechanical inerter.So,it has broad application prospects in the fields of civil engineering vibration control and vehicle operation stability control.This paper uses the torque decomposition method to further clarify the mechanism of the " mechatronic inerter ",and proposes a theoretical calculation method of the maximum "allowable inertance" in engineering;A new scheme of mechatronic inerter based on permanent magnet synchronous motor(PMSM)is proposed.Compared with the traditional mechatronic inerter based on DC motor,it has the advantages of long life and high power density.In order to make the proposed mechanical inerter based on PMSM high-quality semi-active control,this paper designs a set of power electronic converters and its vector control algorithms that are compatible with it;the simulation results show that: The inertance/ mass ratio of the permanent magnet synchronous motor type mechatronic inerter can reach more than 15 times,and the inertia can be continuously adjusted in a large range,which can greatly improve the vibration control effect.In order to achieve a better vibration reduction effect for the inerter in a wider vibration frequency band,this paper calculates the best relationship between the inertance of the tunable inerter and the external vibration frequency based on the "resonance point theory" of the dynamic vibration absorber.In order to meet the stability requirements(inherent stability)of the semi-active control system,the switching rate of the mechatronic inerter based on PMSM is designed based on the energy dissipation equation;to verify the control law,switching law and the effectiveness of the frequency estimation algorithm,this paper conducts a vibration suppression simulation experiment on a single-degree-of-freedom(SDOF)frame civil structure.The simulation experiment results show that the inerter proposed in this paper can effectively suppress the wind vibration of the SDOF frame structure;At the same time,compared with the traditional inerter with fixed inertance,the mechatronic inerter based on PMSM has better damping performance in the whole wind vibration frequency band.In order to further test the overall performance of mechatronic inerter based on PMSM and the above vibration control algorithm in civil structure vibration suppression,a digital model of 5-storey frame civil structure is built in MATLAB/Simulink platform,and the vibration control simulation of "5-storey frame civil structure" is carried out by using semi-active vibration reduction control device based on the mechatronic inerter.The experimental results show that the mechatronic inerter based on PMSM proposed in this paper can suppress the vibration of multi-layer civil structure better than the traditional non tunable inerter.