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To overcome the challenges of NTF simulation accuracy in vehicle NVH simulations, the paper designed and constructed a “rigidwall occupant cabin", which reduced the coupling effect between the "acoustic cavity mode” and the “container" to a negligible extent. Based on the rigidwall passenger cabin, the influence of subacoustic cavities on the overall acoustic cavity mode was analyzed, and the modeling method for porous materials was discussed. The porous material models such as seats and carpets were established, and the effect of front wall sound insulation material on the coupling of sheet metal vibration and acoustic cavity mode was analyzed quantitatively. The simulation and test results show that the cavity mode, airborne sound transfer function, structural vibration transfer function and sound transfer function all achieve good simulation accuracy. The findings of this paper provide a reference for the control of low frequency road noise and engine noise.
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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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