Analysis and control of automotive interior noise from powertrain in high frequency

Application of statistical energy analysis (SEA) method on analysis and control of automotive interior noise from powertrain is introduced. An SEA model is presented for interior noise reduction. The SEA model is composed of a number of subsystems based on a 3D model with all the parameters for each subsystem. The inputs were measured through road tests in different measurable conditions, including inputs from the engine vibrations and the sound pressure of the engine bay. The accuracy in high frequency of the developed SEA model was validated through comparing the analysis results with the testing pressure level data at driver´s ear. Noise contribution and sensitivity analysis of key sussystems were carried out by evaluating the power inputs curve. Then, some effective ways to reduce the car interior noise from powertrain were put forward with analyzing and simulation, which can be used to improve the performance of car interior noise. And, some conclusions were given.