基于误差估计的发动机排气声源特性间接识别模型求解方法研究

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Abstract Linear time-invariant hypothetical model solved in the frequency domain for the determination of engine source characteristics, may still play a practical role in the engine exhaust system design. However, the existing methods for solving the model remain that error is large, the results are sensitive to input error, and the process of identifying and solving are complicated and other issues. In order to improve the accuracy of engine source characteristics identification, error estimation method was established for the indirect identification model, namely source strength level dispersion estimation and source impedance deviation estimation. The equation from the over-determined nonlinear equations in the identification model was pairwise combined, which were directly solved by analytic geometry method. Multiple source characteristic parameter solutions were obtained, and then the optimal solution was selected by the source impedance deviation estimation. According to analysis and calculation, the error value of the source characteristic parameters acquired by the method above, is significantly lower than the traditional four load method. Finally, the three-dimensional coupled simulation of acoustic and flow method was used to verify the results of source characteristic identification. The sound pressure level of far-field response point predicted by simulation agrees well with the experimental results, which indicates that the optimal source characteristic parameters selection method based on error estimation can obtain more accurate source identification results, and can efficiently reduce the identification error and complexity.

Key words： engine source strength source impedance error estimation coupled simulation of acoustic and flow

Received: 26 May 2015 Published: 15 August 2016

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2016/V35/I16/91

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