Dr. Jiao Hu Profile

Dr. Jiao Hu

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Proceedings Article | 5 August 2024 Paper

Research on NVH optimization of automotive engine intake system

Xingshu Liu, Lei Duan, Daquan Tong, Feiyan Guo, Jiao Hu

Proceedings Volume 13226, 132264X (2024) https://doi.org/10.1117/12.3038358

KEYWORDS: Tunable filters, Acoustics, Denoising, Vibration, Pipes, Electronic filtering, Design, Engineering, Aerodynamics, Standards development

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With the improvement of people's living standards, the demand for NVH performance of cars is also constantly increasing. As the main source of automotive noise, the noise of the engine intake system has become an important research topic in optimizing and controlling automotive noise, and improving the overall NVH performance of the vehicle. Based on the basic structure of the automotive engine intake system, a geometric model of the automotive engine intake system is constructed in CATIA software and imported into Virtual Grid partitioning and simulation analysis are conducted in Lab software, and the results showed that the maximum noise at 10cm of the air inlet without a muffler is about 120dB (A); After adding a full muffler, the noise at the air inlet is maintained at around 95dB (A), and the noise reduction effect is obvious. Currently, the effect of the 9.6L air filter is basically consistent with that of the 12L air filter muffler. The noise of the 12L air filter scheme is about 5dB (A) lower than that of the 9.6L air filter scheme. Furthermore, two quarter wavelength tubes are added at the empty tube end of the 12L air filter scheme to eliminate resonance frequencies of 300Hz and 700Hz, respectively, in order to optimize the design and achieve a significant overall noise reduction effect.

Proceedings Article | 4 March 2024 Paper

Coupled electromagnetic-dynamic modelling of induction motor with a broken rotor bar

Yi Yang, Niaoqing Hu, Zhe Cheng, Jiangtao Hu, Jiao Hu

Proceedings Volume 12981, 129814V (2024) https://doi.org/10.1117/12.3014885

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The broken rotor bar fault is one of the common failure types in induction motors. However, most of previous modelled the broken rotor bar fault only based on the electromagnetic model, which can’t provide comprehensive understanding in both of the electromagnetic and mechanical characteristics. This study proposed a coupled electromagnetic-dynamic modelling method of induction motor with a broken rotor bar. A multiple coupled circuit model of the induction motor, a rotor dynamic model, and the coupling effect between these two models are constructed. Dynamic simulation and analysis are conducted, and the effects of the broken rotor bar fault on the electromagnetic and dynamic characteristics are investigated.

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