Magnetorheological vibration reduction system dynamics modeling device and method

Abstract

The invention relates to a magnetorheological vibration reduction system dynamics modeling device and method based on VMD filtering reconstruction. The device comprises a magnetorheological vibration reduction system and a vibration testing system. The magneto-rheological vibration reduction system comprises a machine base, a first elastic element, a second elastic element, a first cast iron block, a second cast iron block and an eccentric vibration excitation device; the vibration testing system comprises a frequency converter, a displacement sensor and a mode decomposition module, and the frequency converter is used for controlling the vibration excitation frequency of the eccentric vibration excitation device. The displacement sensor is used for obtaining a vibration displacement signal of a first cast iron block, the modal decomposition module is used for reconstructing the obtained vibration displacement signal based on variational modal decomposition to obtain a reconstruction analysis signal; an autoregression moving average model and an autoregression model of the reconstruction analysis signal are established; and an optimal model is selected as a magneto-rheological vibration reduction system dynamic model. And external excitation signal components are removed, and a reconstruction analysis signal reflecting the characteristics of the system is extracted.

Description

technical field [0001] The invention relates to the technical field of magnetorheological shock absorbers, in particular to a dynamic modeling device and method for a magnetorheological shock absorber system based on VMD filter reconstruction. Background technique [0002] Magnetorheological Fluid (MR fluid for short) is a controllable fluid, which is a relatively active research in smart materials. Magnetorheological fluid is a suspension formed by mixing tiny soft magnetic particles with high magnetic permeability and low magnetic hysteresis and non-magnetic liquid. This kind of suspension exhibits low-viscosity Newtonian fluid characteristics under zero magnetic field conditions; and high-viscosity, low-fluidity Bingham fluid characteristics under the action of a strong magnetic field. According to this characteristic, magnetorheological fluids are widely used Dampers or shock absorbers used in automobiles and vibration equipment. It is of great significance to study th...

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Problems solved by technology

[0003] For this reason, it is necessary to provide a dynamic modeling device and method for a magneto-rheological damping system based on VMD filter reconstruction to solve the problem of signal discrimination between different states due to the external excitation component being the main energy of vibration. Not high, unable to reflect the essential characteristics of the system well

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