Dynamic Analysis And Vibration Noise Simulation Research Of Piston Air Compressor

The body as a skeleton of piston air compressor,is the main radiation surface of piston air compressor noise.Excitation of piston air compressor mostly through the body passed to other accessories and covering parts,so the body surface vibration will directly affect the vibration and noise of piston air compressor.Finite element analysis method in the compressor vibration noise reduction research is widely used,but the body structure and load were very complex,so the piston air compressor design by using finite element method for predicting the body vibration and radiated noise mostly in modal analysis stage,and the use of the finite element dynamic response analysis to predict body vibration and radiated noise method has just started,so this article takes the body of piston air compressor as example to research the detailed method.First,the 3D solid model of the body is built by using the 3D modeling software Solidworks.The model is imported into the dynamics simulation software ADMAS,and the main parts of the piston air compressor are simulated by dynamic simulation,and the force acting on the main bearing is obtained.Secondly,the free mode and constrained modal analysis of the body are carried out by the large finite element analysis software Nastran.The natural frequencies and modes of the first 9 orders of the body in the free mode and the restrained mode are obtained,and the influence of the constraint on the vibration mode and the natural frequency of the body is analyzed.Then,the Nastran command flow program is compiled to simulate the random vibration applied on the components of the air compressor.The finite element analysis method is used to analyze the dynamic response of the airframe,and the stress distribution of the airframe and the excitation response of each node with time are obtained.Finally,the finite element dynamic response analysis results of the airframe are processed,and the vibration distribution of different nodes of the piston air compressor is studied in detail.Finally,the correctness of the finite element model is verified by hammering experiment.On this basis,the linear weighting method is used to optimize the structure.The vibration characteristics of the piston air compressor are improved by adding reinforcement bars to the sleeve of the piston air compressor.