Simulation And Experimental Study On Damping Characteristics Of Magnetic Suspension Vibration Measurement System

Vibration measurement is widely used in industrial and agricultural production and daily life.Traditional vibration methods gradually show some shortcomings,such as low measurement sensitivity,inability to measure lower frequency vibration,difficulty in realizing multi-dimensional vibration measurement,etc.Using permanent magnet and electromagnetic coil to form suspension of permanent magnet to realize vibration measurement is a brand-new vibration measurement method.The magnetic levitation body is used as the inertial mass of the measurement system in vibration measurement.Its advantages are no elastic components in the system,high measurement sensitivity,weak vibration signal measurement,near zero power consumption in the absence of vibration,low frequency vibration measurement,easy realization of multi-dimensional vibration measurement,and convenient adjustment of system damping by electronic circuits.This vibration measurement method is a brand-new one.Therefore,its characteristics need to be tested and studied.The damping of the measurement system is an important part of all measurements.It is also necessary to measure and study the system damping in the magnetic levitation vibration measurement method.The permanent magnet and the electromagnetic coil were designed in a mixed way,and the magnetic suspension vibration measurement model was made.The detection circuit of relative displacement of infrared light was designed and analyzed.The elimination circuit of ambient infrared light was designed.The magnetic attraction force on the mass was measured by the indirect measurement method through the experimental method,and the relation formula of the magnetic attraction force on the mass was obtained by the numerical analysis method.The advanced controlcircuit of the hybrid measurement system was made and the transfer function of the control system was obtained.The magnetic attraction of the mass was linearized near the equilibrium point,and the dynamic equation of the mass was established through the force analysis of the mass,which verifies the feasibility of the method.The mathematical relation of system damping was derived.By means of numerical analysis,the relationship between element and system damping was obtained.Therefore,the damping of the cylindrical repulsive magnetic suspension vibration measurement system was further analyzed.Simulink simulation model of magnetic suspension vibration test system with permanent magnet and electromagnet was established.Simulation tests were carried out for different sensor mounting points,vibrator initial points and different PD parameter values of the control system.The simulation model of cylindrical repulsive permanent magnet vibration testing device was established,and the device was simulated with different parameters.By setting up a vibration measuring platform,the inherent working state of the system without external vibration was experimentally tested and analyzed.At the same time,the actual measurement was carried out under the condition of external vibration of different frequencies,which verified that the damping setting of the designed system is correct,and the experiment proved that the designed system could run well.