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应用振动ODS方法分析汽车动力总成振动 总被引:1,自引:1,他引:0
介绍了振动ODS分析方法的基本原理,该方法可用于识别结构动态工况下的振动特性。针对某六缸发动机半挂牵引车,应用振动ODS方法分析了该动力总成的振动特性,并通过模态试验验证了振动ODS分析结果的正确性。同时分析了该车动力总成振动大的原因,并提出了改进措施。 相似文献
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在汽车结构设计中,为了避免弹性体产生共振问题,需要适当提高低阶固有频率,做好频率分布规划。白车身系统可以看成是一个多自由度的振动系统,模态分析可以帮助我们了解结构自身的基本振动特性。本文以某重型卡车白车身为研究对象,利用有限元软件Radioss进行模态计算,然后与基于LMS Test.Lab的模态试验结果进行对比,验证有限元仿真计算的精确性,对白车身的设计具有重要的指导意义。 相似文献
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桥梁结构的自振特性是结构动力分析和抗震分析的重要参数。该文通过建立有限元模型进行模态分析和动荷载试验分析来获得梁拱组合桥的计算和实测自振特性,并测得了桥梁的自振频率、振型和阻尼比,并对实桥测试结果和计算分析结果进行了比较,得到该桥在动力荷载下的实际工作状态,以此判断该桥整体结构的安全承载能力和使用条件。 相似文献
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D. A. Crolla 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1980,9(5):237-260
A six degree of freedom model of an agricultural tractor and trailer combination has been developed. Results from eigenvalue and frequency response calculations indicated that tractor operator vibration levels will be higher when operating with a trailer than for the tractor alone, due mainly to increased tractor pitch motion.
Although minor improvements could be made to present tractor and trailer combinations by moving the hitch forward of the tractor rear axle or providing some damping at a sprung hitch, the scope for a significant improvement in ride lies in changing the configuration. If higher speed specialised transport vehicles prove economical for agriculture, there are some advantages in ride vibration to be gained by changing the layout of the tractor and trailer combination to resemble an off-road version of a commercial articulated lorry. 相似文献
Although minor improvements could be made to present tractor and trailer combinations by moving the hitch forward of the tractor rear axle or providing some damping at a sprung hitch, the scope for a significant improvement in ride lies in changing the configuration. If higher speed specialised transport vehicles prove economical for agriculture, there are some advantages in ride vibration to be gained by changing the layout of the tractor and trailer combination to resemble an off-road version of a commercial articulated lorry. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):237-260
SUMMARY A six degree of freedom model of an agricultural tractor and trailer combination has been developed. Results from eigenvalue and frequency response calculations indicated that tractor operator vibration levels will be higher when operating with a trailer than for the tractor alone, due mainly to increased tractor pitch motion. Although minor improvements could be made to present tractor and trailer combinations by moving the hitch forward of the tractor rear axle or providing some damping at a sprung hitch, the scope for a significant improvement in ride lies in changing the configuration. If higher speed specialised transport vehicles prove economical for agriculture, there are some advantages in ride vibration to be gained by changing the layout of the tractor and trailer combination to resemble an off-road version of a commercial articulated lorry. 相似文献
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重型商用汽车车架轻量化设计 总被引:1,自引:0,他引:1
车架是汽车的主要承载构件,其功用是承受来自车内外的各种载荷,连接汽车的各大总成及各种车用设备,结构型式主要取决于汽车的总布置要求。深入研究车架的承载特性是车架结构设计改进和优化的基础,也是保证整车性能的关键。本文以某载货车车架为研究对象,建立了车架有限元分析模型;通过该车架模态仿真,验证了有限元模型的正确性;根据载货车的承载特点和行驶工况,对该车架在满载弯曲工况和满载扭转工况的静态应力分析,考察某载货车车架在典型工况下的应力分布,以此评价车架设计的合理性。在以上分析的基础上,本文对车架的连接横梁进行了结构优化,并对改进方案进行了有限元分析,通过与原结构的动态性能对比分析,确定了结构改进的可行性。 相似文献
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针对某款250型新开发摩托车车架,利用有限元理论建立整车参数化动力学模型,运用模态分析技术、谐响应分析技术、全局灵敏度分析技术及优化设计技术,分析车架动态特性及发动机激励下车架的振动响应,并改进了车架结构以降低振动,总结出一套摩托车车架振动性能优化设计流程,为类似产品的设计提供了参考。 相似文献
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载货车车架的模态分析及优化 总被引:2,自引:1,他引:1
建立了某载货车车架的有限元模型,通过Hyperworks对其进行模态分析,得到该车架的固有频率及振型特征,在保证车架低阶模态性能的前提下,以总质量为目标,对车架纵横梁的尺寸进行优化。 相似文献
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通过有限元分析方法,对大型沥青混合料搅拌设备的塔楼主体机架和筛体进行了模态分析,分析了它们的多阶模态频率和主振型,其结果表明机架和振动筛体的工作频率与其固有频率不重合,保证了其在工作时具有较好的动态性能。 相似文献
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