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The audio system is the core component of the vehicle’s active sound design and active noise reduction. In order to analyze the acoustic characteristics of audio system, it is necessary to use simulation to study its frequency response and the propagation characteristics of the sound field in the vehicle. Due to the wide frequency coverage of the frequency response, full band coverage cannot be achieved using a single simulation method. Traditional sound field simulation can only cover the frequency band below 1 000 Hz by using finite element methods. To solve this problem, Ray-tracing method commonly used in architectural acoustics was introduced into this study. The scope of application of ray-tracing method applicable to the sound field in the vehicle was discussed. Finally, the audio system was modeled and analyzed based on the ray-tracing method, the influencing factors of the results were analyzed. It is pointed out that factors such as high frequency leakage, sound transmission of glass and sound source directivity affect the simulation results.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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