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Low- and medium-frequency noise induces vibrations to the cabin structure, which subsequently radiates noise into the interior. In order to solve the vibration and noise optimization problem of stiffened thin plates, this study employs topology optimization to enhance the vibration and noise reduction effects by optimizing the layout of stiffeners. This study focuses on four-edge clamped stiffened thin plates and employs density-based topology optimization method to maximize its first-order modal frequency. Under the constraint of constant mass, the optimal distribution of stiffeners on the plate is designed. Modal, stiffness, and sound transmission loss analyses are conducted for the stiffened thin plate before and after optimization. The results show that the optimized stiffened plate achieves an increase in its first-order modal frequency and improves sound transmission loss within a certain frequency range, without significantly reducing the overall stiffness.
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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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