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《机械设计与制造》2017,(3)
为了研究零转弯半径割草机(Zero Turning Radius Mower)在土壤斜坡上ROPS的动态响应过程以及确保驾驶员在侧翻过程中的安全,提出了对ZTR割草机整机ROPS动态仿真建模及理论分析方法,以某割草机在倾角为30°的土壤斜坡侧翻工况为例,利用多刚体动力学及弹性体模型相结合的有限元非线性分析方法进行研究,运用LS-DYNA软件对割草机ROPS进行动态仿真分析,结合理论分析和最新ISO21299(2009E)评定标准,验证了建模方法的可行性及仿真结果的合理性。仿真实验结果表明:在整车碰撞过程中ROPS的最大冲击力为22562.3N,最大变形量为43.49mm,吸收的能量值为824.7J,研究表明驾驶员不会暴露于容身空间范围之外(根据ISO21299新标准计算得到容身空间暴露时ROPS最大变形量为275mm),确保了安全性,但是研究也发现目标割草机所采用的ROPS材料(Q235)过度安全,其强度及刚度匹配有待进一步优化。 相似文献
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针对滑移装载机驾驶室翻车保护结构(ROPS)的破坏性试验费用高、进度慢的问题,提出使用ANSYS非线性有限元分析法,依据ISO3471标准对ROPS性能试验进行模拟仿真,将仿真数据与试验结果进行对比分析,验证了仿真方法的有效性。 相似文献
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以ZL50C轮式装载机ROPS为研究对象,建立有限元建模并进行非线性有限元分析,获取ROPS在各种工况下的变形情况;对ROPS性能进行测试研究,并对有限元分析结果和试验结果进行对比分析。基于判定工程车辆ROPS失效准则,利用非线性有限元方法对ROPS进行理论结算。 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
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一种涡旋压缩机径向随变机构的设计 总被引:1,自引:0,他引:1
详细介绍了运用随变原理设计的一种新型径向密封机构的结构特点,工作原理及主要参数的确定方法,该机构可补偿由于涡旋体加工精度不高而造成的功率损失,适用于涡旋压缩机的批量生产。 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献
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针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献
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V. P. Dragunov E. G. Kostsov 《Optoelectronics, Instrumentation and Data Processing》2009,45(3):234-242
Specific features of operation of one- and two-capacitor microelectromechanical converters (MEMC) of energy of mechanical microscopic vibrations into electric energy with a modulated electrode-gap magnitude and with allowance for the mutual influence of electrical and elastic forces are analyzed, and the characteristics of these two devices are compared. The main factors restricting the increase in MEMC power are demonstrated to be the effects of “collapsing” and the condition of conservation of positive rigidity of the system. Expressions for estimating the limiting MEMC parameters are derived. The possibility of electrical energy generation in the presence of “real“ sources of wide-spectrum microscopic vibrations is considered. 相似文献