摘要
运用有限元软件对某农用车车架进行模态分析,得到车架的前四阶自由模态和振型。然后运用LMS Test Lab对车架进行模态试验,得到车架的相关模态参数,模态实验的结果验证了车架有限元模型的正确性。通过对频率和振型的分析,发现车架的第二阶频率与发动机的怠速运转频率非常接近,容易引起共振,造成车架的断裂。以提高车架的第二阶频率为目标,对车架进行拓扑分析,根据分析结果对车架进行针对性的结构改进,然后对改进后的车架进行分析得出车架的第二阶模态频率提高了14.29%,成功的避开了发动机的怠速频率,可以很好的解决车架共振所造成车架断裂的问题,对今后解决此类问题提供了较高的工程实用价值。
The first four free mode and mode of vibration of the agricultural vehicle frame can be obtained by using the software Hyperworks Then, in order to verify the correctness of the geometric model of the frame, we apply the LMS Test Lab to conduct modal test to get related modal parameters of the frame. Through analyzing the results, we found that the frame’s second-order frequency is quite close to the idle speed running frequency of the engine, which makes resonance occur easily. Therefore, the topology optimization should be adopted to improve the second-order frequency of the frame. At last, we made some improvement of the frame’s structure and verification according to the optimization results.
作者
陈棕
李尚平
郑海腾
李冰
CHEN Zong;LI Shang-ping;ZHENG Hai-teng;LI Bing(School of Mechanical Engineering,Guangxi University of Science and Technolegh,Guangxi Liuzhou 545000,China;School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Guangxi Nanning 530006,China;School of Mechanical and Ship Oceaneering,Qinzhou University,Guangxi Qinzhou 535000,China)
出处
《机械设计与制造》
北大核心
2018年第12期53-56,共4页
Machinery Design & Manufacture
基金
广西高校临海机械装备设计制造及控制重点实验室课题资助项目(GXLH2014KF-03)
机械制造系统可靠性控制广西高校重点实验室主任基金(2014JZKG007)
广西高校科学技术研究项目(KY2015YB167)
