Vibration And Radiation Characteristics Of Supercharger Structure Andcontrol Technology Research

With the continuous depletion of the world's energy sources,the efficiency of energy use is becoming more and more important.Power machines such as diesel engines are gradually starting to use turbochargers to improve energy efficiency.With the constant promotion of turbochargers,the performance demands of turbochargers are getting higher and higher,however,the vibration and noise problems of turbochargers are brought along with them.How to control the noise emission of turbocharger work has become one of the most urgent problems in this flied.Therefore,in order to solve the problem of noise emission of a turbocharger,this paper studies the factors affecting the turbocharger radiation noise from two aspects of experiment and simulation,respectively,for the future research of turbocharger radiation noise,Acoustic noise reduction and optimization design provide theoretical guidance and reference.The main contents of this paper include the following aspects:(1)Turbocharger in the vibration and noise radiation test test analysis.The vibration and noise of a turbocharger were tested and sampled using the vibration and noise analysis system of Beijing Institute of Aeronautics and Astronautics 3036 s.Based on the measured results,the main components and spectral characteristics of the turbocharger vibration were analyzed.Variation of the radiated noise component of turbocharger as conditions change.It is concluded that the energy of the turbocharger vibration noise concentrated in the middle and high frequency range,providing the support direction for the noise control.At the same time,the obtained experimental results of the volute surface acceleration also provide the correct data for the volute excitation loading in the next analysis model.(2)Simulation of turbocharger vibration radiation.A rapid method to establish the acoustic component model was adopted.The statistical energy model of the turbocharger was established by VA One software.The vibration and radiation noise of the turbocharger volute was predicted and verified by experiments.The correctness of this method of modeling.The average error in the high frequency band within 3 dB,to meet the engineering requirements.Engineering in the future can be combined with rapid modeling method of high-frequency noise simulation analysis.This method is easy to operate,improves the modeling efficiency,adapts to a wide range,and is safe and reliable.In engineering application has a certain significance.(3)Turbocharger vibration noise control method.According to the principle of noise control and the working environment of turbocharger,a scheme of noise reduction and heat insulation coating is put forward.The calculation model of coating based on statistical energy method was established by using VA One software.The comparison between the experimental value and the simulation value of the sound insulation characteristic curve of the calculation model verified the correctness of the simulation calculation of the coating model.Then,taking the coating as the research object,the influencing factors of the sound insulation quantity of the structure are analyzed,and the influence law of the parameters on the sound insulation characteristic curve is discussed.The values of the parameters corresponding to the optimal sound insulation quantity are obtained.In summary,this paper systematically studied the statistical energy method and its parameters to determine the method,turbocharger vibration noise test method,SAE turbocharger modeling method,turbocharger vibration isolation simulation method,turbocharger Joint vibration and noise control method.The research results have important theoretical significance and engineering value for guiding turbocharger vibration noise control design and engineering application.