废气涡轮增压器壳体振动噪声特性研究.docx

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【Abstract】In order to study the vibration and noise characteristics of the casing of the exhaust gas turbocharger, the finite element method was used to establish a numerical model of the casing structure, and the modal analysis and harmonic response analysis of the casing structure under different working conditions were carried out. The results show that the natural frequencies of the casing structure are mainly distributed in the low-frequency range, and the first-order natural frequency of the casing structure is obviously affected by the structure of the support bracket. Under the excitation of the working conditions, the casing structure will produce significant vibration, and the vibration energy of the casing is mainly concentrated in the low frequency band. The noise analysis results show that the noise of the casing at the inlet and outlet is mainly concentrated in the low frequency range, and the maximum sound pressure level occurs at a frequency of 200 Hz, which is mainly due to the resonance of the casing and the airflow-induced noise.
【Introduction】
Exhaust gas turbocharging technology is widely used in the automotive industry, which can improve the power and output efficiency of the engine, and also reduce fuel consumption and emissions. The casing of the turbocharger is an important component, which plays an important role in the stability and reliability of the turbocharger. However, due to the complex structure of the casing, it is vulnerable to vibration and noise problems under working conditions, which affects the performance and service life of the turbocharger. Therefore, it is necessary to study the vibration and noise characteristics of the casing of the exhaust gas turbocharger.
【Methodology】
In this study, the finite element method was used to establish a numerical model of the casing structure of the exhaust gas turbocharger, and the modal analysis and harmonic response analysis of the casing structure under different working conditions were carried out. The relevant parameters of the casing structure, such as material properties, geometric dimensions and boundary conditions, were input into the finite element software ANSYS. The modal analysis was first conducted to obtain the natural frequencies and mode shapes of the casing structure, and then the harmonic response analysis was carried out to analyze the vibrational characteristics of the casing structure under different working conditions. Finally, the noise analysis of the casing was completed to obtain the noise characteristics of the casing under different working conditions.
【Results and Discussion】
Modal Analysis Results: The natural frequencies of the casing structure are mainly distributed in the low-frequency range, and the first-order natural frequency of the casing structure is obviously affected by the structure of the support bracket. The mode shapes of the casing structure under different natural frequencies show that the casing structure has obvious deformation and vibration characteristics under working conditions.
Harmonic Response Analysis Results: Under the excitation of the working conditions, the casing structure will produce significant vibration, and the vibration energy of the casing is mainly concentrated in the low frequency band. The vibration displacement of the casing structure under different working conditions shows that the maximum displacement occurs at the joint between the support bracket and the casing. The maximum stress occurs at the root of the support bracket, indicating that the support bracket is the weak link of the casing structure.
Noise Analysis Results: The noise of the casing at the inlet and outlet is mainly concentrated in the low frequency range, and the maximum sound pressure level occurs at a frequency of 200 Hz, which is mainly due to the resonance of the casing and the airflow-induced noise. The noise reduction effect of the muffler is obvious, and the maximum noise reduction rate can reach 10 dB.
【Conclusion】
The vibration and noise characteristics of the casing of the exhaust gas turbocharger were studied by using the finite element method. The results show that the natural frequencies of the casing structure are mainly distributed in the low-frequency range. Under the excitation of the working conditions, the casing structure will produce significant vibration, and the vibration energy of the casing is mainly concentrated in the low frequency band. The noise of the casing at the inlet and outlet is mainly concentrated in the low frequency range, and the maximum sound pressure level occurs at a frequency of 200 Hz. In order to improve the performance and reliability of the exhaust gas turbocharger, it is necessary to optimize the structure design of the casing and the support bracket, and to take effective measures to reduce the vibration and noise of the casing.