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刘爽,徐红梅,周杰,钟文杰,刘海悦.基于模态的联合收获机车身框架振动特性分析与结构优化[J].华中农业大学学报,2018,37(3):108-116
基于模态的联合收获机车身框架振动特性分析与结构优化
Analyzing vibration characteristics and optimizing structure of combine harvester body frame based on modal analysis
  
DOI:
中文关键词:  收获机车身框架  共振  模态分析  尺寸优化  拓扑优化
英文关键词:harvester body frame  resonance  modal analysis  size optimization  topology optimization
基金项目:国家自然科学青年基金项目(51405178)
作者单位E-mail
刘爽 华中农业大学工学院/农业部长江中下游农业装备重点实验室武汉 430070 liushuang187@126.com 
徐红梅 华中农业大学工学院/农业部长江中下游农业装备重点实验室武汉 430070 xhm790912@163.com 
周杰 华中农业大学工学院/农业部长江中下游农业装备重点实验室武汉 430070  
钟文杰 华中农业大学工学院/农业部长江中下游农业装备重点实验室武汉 430070  
刘海悦 华中农业大学工学院/农业部长江中下游农业装备重点实验室武汉 430070  
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中文摘要:
      以某联合收获机主机车身框架为研究对象,采用有限元柔性体技术创建车身框架的有限元柔性体模型,并在其基础上进行模态分析与计算。结果表明,车身框架的第一阶模态频率为7.29 Hz,与收获机正常工作时割刀的激励频率(7 Hz)接近,易发生共振,且对人体舒适性影响最大。为了调整收获机车身框架的固有频率,以避开外部激振频率范围,采用HyperMesh软件对收获机车身框架柔性体模型进行尺寸优化和拓扑优化,结果表明,尺寸优化后,收获机车身框架的第一阶模态频率由优化前的7.29 Hz提升至8.63 Hz,车身框架质量下降了0.006 t; 拓扑优化后,收获机车身框架的第一阶模态频率由优化前的7.29 Hz提升至8.49 Hz,车身框架质量下降了0.107 t。拓扑优化与尺寸优化均可使收获机车身框架固有频率避开外部激振频率范围,但综合考虑优化设计的目标与生产制造成本,采用尺寸优化技术对收获机车身框架进行结构优化更为适合。
英文摘要:
      The body frame of a combine harvester was used to build the body frame geometry model.As the complexity of the body frame structure of the harvester,the road motions,cutter excitation,threshing roller excitation and other vibration generated by the body frame will be passed to the driver.In order to simulate the process of vibration excitation to the human body frame in a more appropriate way,it is necessary to soften the harvester body frame that conducted the vibration excitation.Based on the geometry model,the finite element soft body frame analysis is used to establish the finite element soft body frame model of the vehicle body frame.The modal analysis and calculation are carried out on the basis of the new model.In the structural vibration,the influence on the dynamic behavior of the structure of lower order mode is more than that of the higher order mode.The low order mode determines the dynamic characteristics of the structure.The body frame structure was optimized with the first-order mode.The results showed that the first-order modal frequency of the body frame of 7.29 Hz is close to the excitation frequency (7 Hz) of the cutter when the harvester works normally,which is prone to resonance and has the greatest impact on human comfort.In order to adjust the natural frequency of the body frame of the harvester to avoid the external excitation frequency range,the size and topology of the model of the vehicle body frame were optimized with HyperMesh software.The results showed that the first-order modal frequency of the harvesting machine body frame upgraded to 8.63 Hz from the 7.29 Hz.The body frame mass decreased by 0.006 t after the size optimization.After topology optimization,it was the same that the first-order modal frequency of the harvesting machine body frame was improved to 8.49 Hz from 7.29 Hz.The body frame quality was reduced by 0.107 t.The natural frequency of the harvester body frame can avoid the external excitation frequency range by optimizing topology and size.Considering the goal of design optimization and manufacturing cost,the size optimization technology is more suitable.It will provide some reference for reducing the probability of occurrence of body frame resonance and the optimizing lightweight and comfort of harvester to a certain extent.
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