## 1 Introduction
### Research Status of Sound Simulation Systems
#### 1.1.2 Research on Accelerated Sound Quality Characteristics  
The subjective feeling of car noise can be judged by car sound quality. Due to the structural characteristics of the electric drive system, the acceleration noise in a pure electric vehicle has been greatly reduced compared with a fuel vehicle. However, due to the lack of acceleration sound quality, it is still difficult for the driver to obtain a good acceleration driving experience. In the field of vehicle acceleration sound quality, great progress has been made after years of research by researchers at home and abroad, including the theoretical composition of acceleration sound quality and the subjective evaluation method of acceleration sound quality.  
[PERSON] proposed the concept of the semantic segmentation method for sound quality evaluation, a relatively complete sound quality evaluation process, which was proposed after the improvement of the method [25]. [PERSON] summarized the methods used in subjective and objective evaluation of sound quality and expounded the setting of sound quality goals and the realization process of sound quality [26]. The noise of motorcycles was modulated by [PERSON] et al., and the sound quality goal of'sporty feeling' was proposed, indicating that enhancing the specific order noise component is conducive to improving the'sporty feeling' of sound [27]. [PERSON] proposed that the sound quality in the car can be identified by two goals, namely 'comfortable sensation' and'sporty feeling'. Different sound quality perceptions are related to their spectral composition and envelope [28]. [PERSON] defined the subjective feeling of'sporty feeling' as related to factors such as order components and tone [29]. [PERSON] proposed that the sound quality of the interior acceleration'sporty feeling' is affected by many factors, such as the main order, tone, and some parameters related to the speed. Therefore, the intake system of the car can be designed to achieve the'sporty feeling' of the sound quality in the car [30]. [PERSON] studied subjective evaluation models of sound quality perception in different countries and pointed out that people's perceptions of'motion' and 'luxury' sounds were different in different countries [31]. Scholars have mostly studied the subjective evaluation and implementation methods of accelerated sound quality. The paired comparison method in subjective evaluation has been studied and improved by [PERSON], [PERSON], and others. They mainly studied the influence of population classification on the evaluation results in the subjective evaluation test of sound quality. In order to improve the accuracy of the evaluation results, they evaluated the subjective preference of paired comparison through crowd classification, and then a triangular loop test algorithm was proposed to accurately calculate the misjudgment rate of the paired comparison method, and the empirical formula of the algorithm was derived [32; 33; 34; 35; 36; 37; 38; 39; 40]. The test method of vehicle sound quality was studied by [PERSON], and the evaluation process was explained. The influence of evaluation method and subjective evaluation group on the test results were compared [41].  
Generally speaking, scholars describe the characteristics of accelerated sound quality through these subjective feeling words, including'sense of movement','sense of pleasure','sense of comfort','sense of motivation','sense of luxury','sense of acceleration','sense of strength','sense of vitality', etc. Scholars' research on sound quality is mainly based on the existing evaluation methods, and the evaluation results are improved in terms of data screening, evaluation efficiency improvement, and stability maintenance.