| 基于应变能分析的双目标白车身模态优化 |
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| 作者姓名： | 弓剑 徐元利 夏洪兵 王海洋 董俊红 |
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| 作者单位： | 天津科技大学机械工程学院;中国汽车技术研究中心有限公司汽车工程研究院 |
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| 基金项目： | 天津市科技特派员项目(16JCTPJC48700)；天津大学内燃机燃烧学国家重点实验室开放基金资助项目(k2013-6). |
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| 摘 要： | 建立某混合动力SUV带挡风玻璃白车身的有限元模型,分析白车身的模态特性,并通过试验模态验证其可靠性。针对未达到35Hz目标值的后部扭转模态,通过改进白车身焊点、结构、板件厚度等步骤进行优化。在板厚优化之前引入模态应变能分析法,缩减模态灵敏度分析样本,提高优化效率。最终,白车身后部扭转模态频率由34.42Hz提升至37.39Hz,而车身质量仅增加0.2%(0.75kg),在实现白车身模态优化目标的同时还尽量减少了车身增重。
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| 关 键 词： | 白车身 模态应变能 灵敏度分析 模态优化 有限元法 |
| 收稿时间： | 2018/5/17 0:00:00 |
Bi-objective optimization of body-in-white modal based on strain energy analysis |
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| Authors: | Gong Jian Xu Yuanli Xia Hongbing Wang Haiyang and Dong Junhong |
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| Institution: | College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222, China;Automotive Engineering Research Institute, China Automotive Technology and Research Center Co., Ltd., Tianjin 300300, China,College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222, China,Automotive Engineering Research Institute, China Automotive Technology and Research Center Co., Ltd., Tianjin 300300, China,Automotive Engineering Research Institute, China Automotive Technology and Research Center Co., Ltd., Tianjin 300300, China and Automotive Engineering Research Institute, China Automotive Technology and Research Center Co., Ltd., Tianjin 300300, China |
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| Abstract: | Finite element model of the body-in-white with windshield of a hybrid SUV was established. The modal characteristics were analyzed and its reliability was verified by experimental modal. It was found that the retral torsion modal was below the target value (35 Hz), so the welding spots, body structure and plate thickness were optimized. Before the plate thickness optimization, the modal strain energy analysis method was introduced to reduce the modal sensitivity analysis samples and improve the optimization efficiency. In the end, the retral torsion modal frequency has increased from 34.42 Hz to 37.39 Hz, and the body mass only by 0.2% (0.75 kg), which means the goal of modal optimization was achieved at the least cost of body weight gain. |
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| Keywords: | body-in-white modal strain energy sensitivity analysis modal optimization FEM |
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