混合动力车型燃油箱晃荡声的时变响度评价方法与降噪应用

随着市场对汽车舒适性要求的提高，燃油箱油液晃动噪声问题越来越受重视。尤其是对于混合动力乘用车型，由于缺少发动机怠速噪声的掩蔽效应，更容易引起市场用户对燃油箱晃荡声的抱怨。该文以某搭载皮带驱动起动发电机混合动力SUV车型的燃油箱晃荡声问题为案例，系统性地进行了整车测试分析与路径排查工作，结合非稳态的晃动等效动力学模型，阐述了油液晃动瞬时冲击现象的潜在机理，提出了油箱壁面与形貌优化改进的思路；同时，通过对比分析声压级与响度指标方法的差异，说明了采用时变响度声品质指标能够更准确地反映出车内人耳对晃荡声的主观评价感受。该文主要通过“结构声”传递路径的优化，降低了油箱晃动激励到车内的传递，显著改善了车内的油液晃荡声问题，这对提升燃油系统NVH性能集成开发的能力，有着较重要的工程参考价值。

Hybrid vehicle fuel tank sloshing evaluation method and refinement application based on time-varying loudness model

With the improvement of vehicle comfort requirements of market users, fuel sloshing problem has been paid more and more attention. Especially the hybrid passenger vehicle is lack of engine idle noise masking effect, it is more likely to cause market customers complaining. In this paper, the fuel sloshing problem of a BSG hybrid vehicle is taken as an example. The vehicle test analysis and path investigation are systematically carried out. By comparing and analyzing the difference between the sound pressure level and the loudness index method, it is shown that the time-varying loudness sound quality index can more accurately reflect the subjective evaluation of the human ear in the car. In this paper, through the optimization of vehicle structural transmission path, the transmission of fuel sloshing excitation to the vehicle is reduced, and the fuel sloshing problem in the vehicle is significantly improved. It has important engineering reference value for improving the integrated ability of vehicle fuel system NVH development.