摘要
为了有效解决某轻型载货车储气罐支架的断裂故障,首先基于建立的储气罐支架有限元模型进行振动特性分析,分析结果表明其前三阶固有频率接均处于发动机激励频率范围之外,不会产生共振。其次测试各种道路的时域载荷,测试结果表明其中角度搓板路的激励频率与储气罐支架第一阶固有频率相接近,从而引起共振,不满足振动特性要求。然后对其进行振动强度分析,分析结果表明其应力水平不达标,其最大应力点与开裂处一致。再对其进行振动疲劳寿命预测分析,分析结果表明其疲劳寿命也不达标,其危险点也与失效位置相同。再采用集成平台对储气罐支架的结构进行优化设计,优化之后其模态频率、振动强度和振动疲劳均符合性能要求,并且其重量也有所减轻,总体优化效果较佳。最后整车试验结果表明优化之后储气罐支架的振动大幅度降低,并且没有发生失效。
Aiming at solving the fracture fault of a light truck air tank bracket. Firstly, the air tank bracket was vibration analyzed based on establishing its finite element model, the analysis results showed that its first three natural frequency were outside the engine excitation frequency range, the resonance would be avoided. Secondly, the time domain load of different roads were tested, the test results showed that the angled washroad excitation frequency was close to the air tank bracket first natural frequency, so it it would cause resonance, it couldn’t meet vibration characteristics. Thirdly, the air tank bracket was vibration strength analyzed, the analysis results showed that its stress level didn’t meet design requirements, and its maximum stress point was consistent with the fracture position. Fourthly, the air tank bracket vibration fatigue analysis showed that its fatigue life didn’t meet design requirements, and its danger point was also consistent with the failure position. The air tank bracket structure were optimization designed by adopting integration platform, its modal frequency, vibration strength and vibration fatigue could meet the performance requirements after optimization, and its weight was also reduced, so its overall optimization effect was good. Lastly, the vehicle test results showed that its vibration decreases dramatically after optimization, and the failure didn’t occurr.
作者
游永忠
YOU Yongzhong(School of Transportation and Logistics,East China Jiaotong University,Nanchang 330013,China)
出处
《机械设计与研究》
CSCD
北大核心
2020年第1期190-195,共6页
Machine Design And Research
基金
江西省教育厅科学技术研究项目(GJJ160485)。
关键词
断裂
振动
频率
强度
疲劳
优化
fracture
vibration
frequency
strength
fatigue
optimization
作者简介
游永忠(1969-),男,讲师,主要研究方向:交通运输设备,已发表论丈4篇。E-mail:youyongzhong1969@163.com。
