共查询到20条相似文献,搜索用时 140 毫秒
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利用ANSYS Workbench软件对HHT 3进行模态分析,得到箱体前6阶固有频率和相应的主振型,并与主要振源的工作频率进行比较.结果表明:HHT 3正常工作时,箱体夯锤的冲击振动频率和发动机振动频率均小于实际情况,因此不会发生共振. 相似文献
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针对某公司插件机的插件精度和速度难以满足工作要求的问题,设计了一种轻量化横梁结构,并且对其横梁的动态特性进行了研究。首先,根据拓扑优化的结果对横梁的内部结构进行了优化设计,并通过3种结构的仿真数据对比建立了刚度特性较好的横梁模型;然后,对横梁-箱体系统进行了模态分析,得到了横梁的前六阶固有振型,并且分析了不同箱体尺寸对系统固有频率的影响;最后,基于模态分析的结果和载荷特性对横梁进行了瞬态动力学分析,计算出了横梁在运动过程中的最大变形量,并且通过传感器测试验证了仿真结果。研究结果表明:横梁-箱体系统与机床不会产生共振,系统的薄弱部分为插件头组件,减小插件头组件的整体厚度可以有效提升系统的固有频率;横梁在插件过程中的瞬态仿真结果最大形变量为0.032 mm,出现在减速阶段,传感器的测试结果为0.035 mm,两者相比误差较小,满足插件机的工作要求。 相似文献
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为了获得减速器危险输入转速分布范围,首先利用三维设计软件Pro/E对减速器箱体进行三维建模,之后将其导入到ANSYS Workbench中进行有限元静力学分析、模态分析,得到了箱体的最大应力、最大变形分布云图,以及前六阶固有频率及模态振型,其固有频率分布范围在481.48~1 203.2 Hz之间。结合减速器固有频率分布范围,经过计算,得到了相应频率下的减速器输入转速,转速范围为28 888.8~72 192 r/min之间。将实际工作时减速器的转速与上述转速进行对比分析,可确定减速器是否会发生共振现象,为实际工作中减速器的结构优化设计、振动问题的研究分析提供了一定参考。 相似文献
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针对出口内燃动车动力包的双层隔振问题,根据双层隔振系统的结构参数,建立双层隔振系统的有限元模型。对双层隔振系统进行了模态计算,掌握了系统的频率特性。根据柴油机组激振力的频率特性,定量对双层隔振系统进行模态匹配分析。对双层隔振系统进行谐响应计算,准确判断构架和机组是否发生共振,验证模特匹配的合理性。施加怠速工况下的各个激振力,对双层隔振系统进行了强迫振动计算,计算双层隔振系统的振动烈度和传递率。结果表明:双层隔振系统的隔振性能良好,能满足实际工程需求,研究结果可为实际工程提供参考。 相似文献
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Vibration modeling and modification of cutting platform in a harvest combine by means of operational modal analysis (OMA) 总被引:3,自引:0,他引:3
Vibration in combine cutting platform causes increase in grain loss, reduction of vehicle lifetime and driver’s comfort, and also affects the machine working precision. In order to determine vibration behavior of a mechanical structure, the model which relates acting forces on the structure with the resulting responses of it plays a significant role. For a great deal of mechanical structures, only response data are measurable while the actual loading conditions are unknown. Therefore, the system identification process will need to build on the output-only data. The use of such processes allows the identification of modal models of structures which are excited by unknown ambient vibration. In this contribution, controlled vibration experiments were conducted on cutting platform of a combine in order to recognize and reduce its vibration problem. A finite element model is constructed representing the vibration behavior of the cutting platform. Also, the frequency domain decomposition (FDD) technique is used to estimate the modal parameters of vibrating structures in operational conditions. Then, the finite element model is successfully updated by comparing the estimated results of the operational modal analysis. It is found that there is a resonance condition around 50 Hz. Then, the mass change strategy is used to estimate the scaling-factor and frequency response function (FRF) matrix. Finally, the resonance condition and subsequently vibration of cutting platform is reduced by the structural modification technique. As a result of this modification, natural frequency of fifth mode shape (50 Hz) of the combine cutting platform is shifted to 48 Hz. 相似文献