Optimization Design Of Vibration And Noise For Automobile Blower

Nowadays vehicles are more and more widely used,while driving comfort is of greater concern to the passengers.Automotive air conditioning system provides a superior and comfortable environment for drivers and passengers,leading to the improvement of transport efficiency and safety.However,noise can be generated due to the operation of the automotive air conditioning system.In particular,new energy vehicles won’t influenced by the engine noise,so the main proportion of noise in the compartment is the aerodynamic noise caused by the rotation of the air conditioning blower and the mechanical noise caused by the vibration of the blower.The research object of this paper is the ZFF-11476 blower,this type of blower shows an unpleasant "roar" when operating in high speed.So it is necessary to do some acoustic optimization work on the "roar" problem.The blower model was built up and simplified based on the noise vibration test of the HVAC system.The source of vibration was analyzed through the rotor unbalance test and the mechanical vibration noise was simulated via Virtual.Lab.It is found that the mechanical vibration noise at low frequency is not the main source of the blower’s noise.The aerodynamic noise of the blower was analyzed viaStar-ccm+to simulate the blower’s transient state noise and steady state noise,and it’s found that therc’s a major noise peak when the blower runs.In view of this situation,the flange was perforated and then the whole component is tested again,as a result,the noise amplitude was effectively reduced.According to the above-mentioned optimization and improvement project,modified products are produced,and reference basis for the follow-up air conditioning blowers’development is provided.