Analysis Of Dynamic Characteristics Of Rolling Rotor Compressor And Research On Vibration And Noise Reduction

The rolling rotor compressor is the core of the air conditioning system.An air conditioner with excellent performance means that it has the characteristics of fast cooling,low vibration and noise.The performance of compressor plays a decisive role in the performance of air conditioning system,so the dynamic characteristics of compressor and the research of vibration and noise reduction have always been an important topic.In this paper,the rolling rotor compressor is taken as the research object,the dynamic characteristics of the compressor are deeply studied around the vibration and noise problems of the compressor.The purpose of this paper is to establish a set of dynamic characteristic analysis method for compressor.On this basis,a set of vibration and noise reduction design scheme is put forward,and then the vibration isolation system in the scheme is optimized.The main research contents of this paper are as follows:(1)Based on the structure and working principle of the compressor,the force analysis of the compressor is carried out,which lays the foundation for dynamic analysis of compressor.(2)The modal analysis of the key components of the compressor is carried out to obtain the natural frequency and mode shape of the structure,and the modal test is used to verify the accuracy of the modal result of the block.It provide a basis for determining whether the structure will resonate during work.(3)Considering the flexibility of the crankshaft system,a bearing-crankshaft multi-body dynamics model is established based on dynamics theory.A relatively accurate load function is obtained by using the Fourier transform theory to fit the gas force function with a linear superposition of multiple cosine functions.The bearing load of the compressor is obtained by dynamic simulation.(4)The harmonic response analysis is carried out by modal superposition method with gas force load and bearing load as boundary conditions.Through response analysis of block,the displacement and stress of the block can be grasped,it provide a basis for the structure design and improvement of the block.(5)The acoustic boundary element model of compressor block and acoustic field point model are established based on the acoustic boundary element theory.The response data of the block surface is mapped to the acoustic boundary mesh surface by interpolation method.Through simulation analysis of acoustic radiation field of the block,the block radiation parameters can be acquired,the foundation is laid for the structural acoustic optimization of the block.Based on the comprehensive analysis results,a set of vibration and noise reduction schemes for compressors is proposed.(6)Based on the parametric modeling function of MATLAB and ADAMS,a parametric integrated simulation platform based on ISIGHT is established for the proposed compressor vibration and noise reduction scheme.The optimal mathematical model of the vibration isolation system is established with taking the energy decoupling rate of the vibration isolation system and the total reaction force as the objective,taking the vibration displacement and the natural frequency as the constraints,and taking the main stiffness of the vibration isolation component as the design variable.Based on the integrated simulation platform,the Latin hypercube experimental design method is used to analyze the sensitivity of design variables.Then,the NSGA-II optimization algorithm is used to optimize the parameters,and the vibration isolation system with good effect is obtained.