Design And Research Of Electromagnetic-mechanical Composite Vibration Isolation Control System

Mechanical vibration widely exists in the working environment of weapon equipment.Effective vibration isolation control is the basic guarantee of military products’ technical and tactical performance,and it is of great significance to improve the performance and reliability of weapons and equipment.Therefore,the research of electromagnetic-mechanical composite vibration isolation control system based on the magnetic suspension technology is carried out in this paper.The author designs the active passive integrated vibration isolation device and active vibration isolation control algorithm,carries on the simulation analysis and the experimental verification to the vibration isolation effect of the system.The main work of the thesis includes:First of all,in order to complete the scheme design of the electromagneticmechanical composite vibration isolation control system,the demand analysis of the system is carried out,and the design index of the electromagnetic mechanical composite vibration isolation control system is proposed,which provides the basis for the structure and function design of the composite vibration isolation system.Secondly,through the stress-strain simulation analysis of the composite vibration isolation device,the overall structure of the composite vibration isolation device is optimized.At the same time,according to the dynamic requirements of elastic strength,stiffness and geometry,a mechanical spring for passive vibration isolation is designed for the composite vibration isolation device.Finally,a vibration test device based on eddy current sensor and acceleration sensor is built to monitor and acquire the vibration state of the composite vibration isolation system in real time.Secondly,around the design of active magnetic suspension isolator in the electromagnetic-mechanical composite vibration isolation device,the structure form of the electromagnet is firstly determined according to the rated index of the electromagnetic actuator,and the core material,coil turns,wire diameter,basic size of electromagnet and armature are designed.Secondly,the characteristic parameters such as coil magnetic potential,electromagnetic suction,coil temperature rise and electromagnet mass are verified by calculation and finite element simulation.Finally,a chopper based on MOSFET is designed to drive the electromagnet.Thirdly,the structure of the electromagnetic-mechanical composite vibration isolation system is analyzed,and the mathematical model of the system is established.At the same time,an active vibration isolation control algorithm based on switching is designed for low frequency and high frequency vibration by using linear theory,then the high frequency vibration isolation control algorithm was optimized by using fuzzy control.The differential position current double closed-loop fuzzy PID vibration isolation control strategy is designed.Finally,the designed vibration isolation control law is introduced into the nonlinear model of the actual system,and multiple sets of simulations are carried out for different excitation environments,which verifies the rationality and feasibility of the design scheme of the electromagnetic-mechanical composite vibration isolation control system.Fourthly,the integrated construction of electromagnetic-mechanical composite vibration isolation experimental platform and the closed-loop debugging of the control system are completed.On this platform,the experimental research on passive and active-passive integrated vibration isolation control is carried out respectively.The experimental results are consistent with the simulation results.It shows that the system can effectively realize active-passive integrated vibration isolation control by using the designed vibration isolation control algorithm,better solve the contradiction between the system bandwidth and stiffness.The electromagnetic-mechanical composite vibration isolation control system has a good vibration isolation effect on both high frequency and low frequency vibration,which effectively improves the vertical vibration isolation effect.