Research On Active Control Method Of Compressor Vibration And Sound Based On Vibration Mode

As the main component of air conditioning,rolling rotor compressor can drive,compress and separate the gas and liquid of refrigerant more efficiently.Its mass is scattered,and there are rotating mechanism and electromagnetic driving mechanism,which can easily produce noise and vibration while working.Therefore,analyzing its structure and adopting a targeted control scheme to achieve vibration and sound suppression is of great significance to improving its quality.Based on active control theory,this paper uses the MATLAB-COMSOL co-simulation platform to establish a vibration and sound control research plan for geometrically irregular and complex devices,which solves the problem of vibration and sound suppression in the low and mid frequency bands of this type of device,it can provide reference for the application of active control methods in engineering projects.First,the characteristics of the compressor excitation source and the parameters of vibration and noise are studied.The characteristics of the vibration and sound excitation source of the compressor are analyzed,and the main source and main control frequency band are located based on the test and calculation results of the near-field sound pressure level,the vibration frequency response of the whole machine,and the sound radiation efficiency of various structural parts;Combining calculation and simulation methods,the structure of the main source and the sound radiation mode are obtained,and the corresponding relationship between the two is analyzed.Based on this,the feasibility of reducing the sound radiation by suppressing the structure mode is explored.Secondly,the configuration optimization of the number and location of active control devices is realized.Sort the modal energy corresponding to each eigenfrequency to obtain the order and number of modals to be controlled,thereby determining the number of actuators/sensors.Furthermore,referring to the observability/controllability criterion,and combining the particle swarm algorithm and the finite element method,the position optimization of the active control device for complex geometric parts is realized.Observing the iterative characteristics of fitness value,a variable step size particle swarm algorithm is proposed,which improves the position optimization effect and convergence speed.Finally,based on FULMS and its optimization algorithm,the algorithm performance optimization and active control simulation are carried out.On the basis of the normalized FULMS algorithm,the Nadam optimizer is used for the iterative process of filter coefficients to improve the convergence performance of the active control algorithm.An active control simulation scheme based on the MATLAB-COMSOL joint simulation platform is proposed,and the algorithm performance verification and analysis are carried out by using the simulation test process.Taking the main casing of the compressor as an example,this paper establishes a method and process for active control of geometric irregular structures.At the same time,the particle swarm algorithm and FULMS algorithm are improved to better improve the vibration and sound suppression capability of the system.This method has great research significance and reference value for the active control design of components with complex working conditions and larger dimensions such as air-conditioning compressors.