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杆端向心关节轴承动应力下疲劳寿命分析研究 总被引:2,自引:0,他引:2
针对QG325型切管机液压缸杆端向心关节轴承工作时主要是向心内外圈疲劳磨损破坏问题,采用Solidworks 建立了简化的杆端向心关节轴承三维模型;通过ANSYS workbench 13.0瞬态动力分析模块对其进行实际工况下动应力分析,找出了杆端向心关节轴承最大应力集中处.在此基础上利用ANSYS workbench 13.0的疲劳分析模块实现对杆端向心关节轴承的接触疲劳寿命分析,获取杆端向心关节轴承在实际工况下的接触疲劳寿命,有效预测零件的工作寿命. 相似文献
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针对YW-1020型全自动深压纹机各关键铰链处的向心关节轴承在实际工作时内、外圈易发生疲劳磨损的问题,根据疲劳寿命预测相关理论,研究了深压纹机在满载工况下向心关节轴承的疲劳寿命。通过Solidworks建立了深压纹机整机的三维模型,运用ANSYS Workbench对深压纹机进行了有限元分析,提取出应力最大的向心关节轴承,进而利用Fatigue Tool模块对轴承进行疲劳寿命分析,该结果与接触疲劳寿命理论估算结果基本一致,并与试验所得失效轴承的寿命数据相接近。研究结果表明:最大应力位置处向心关节轴承的最小疲劳寿命约为266 d,有效预测了轴承的工作寿命。 相似文献
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基于双应力加速寿命试验的关节轴承寿命预测与可靠性分析 总被引:1,自引:0,他引:1
自润滑关节轴承寿命主要是由衬垫的磨损性能决定的,但衬垫的磨损一般是非线性的,使得寿命难以预测。采用同时改变载荷和摆频2种应力的方法进行加速寿命试验,建立以pv值、磨损量退化数据为输入参数,寿命值为输出参数的灰色神经网络预测模型。经验证该预测模型对关节轴承寿命预测的最大误差仅为7.33%,平均误差仅为3.892%。对不同加速应力下自润滑关节轴承可靠性进行评估,结果表明,关节轴承的可靠性在L_(10)(可靠度为90%时的寿命)之前下降趋势缓慢,然后迅速下降,pv值越大可靠性下降越迅速;随着pv值的增大,关节轴承寿命近似呈指数下降,经验证可用逆幂率加速模型反映二者关系。 相似文献
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输油臂是油品码头关键的装卸设备,其运行的稳定性、可靠性决定着油品能否及时输送.回转轴承是整台输油臂的"心脏",它既是输油通道,又是输油臂实现3个方向全方位连接的重要结构部件,它的质量决定了输油臂的价值和使用寿命.因此,对回转轴承的研究对输油臂整体的安全性具有极其重要的意义.以某型号输油臂中间回转轴承为研究对象,借鉴关节轴承寿命计算方法,对其进行动态寿命计算,按回转轴承进行静承载能力校验.并在有限元应力分析的基础上,应用疲劳分析软件nSoft选用应变疲劳分析方法进行寿命预测,为设计人员对类似结构的设计提供了一定的参考. 相似文献
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自润滑向心关节轴承磨损寿命模型 总被引:5,自引:0,他引:5
以摩擦副为钢/PTFE编织物的自润滑向心关节轴承为研究对象,从磨损机理出发,基于组合磨损理论和稳定磨损中线磨损率保持不变的特征,通过对复合摆动条件下向心关节轴承的运动分析、接触和速度分析、受力分析、磨损量分析,进而推导出新的解析式寿命模型,可分别计算旋转摆动、倾斜摆动以及复合摆动三种摆动方式下的自润滑向心关节轴承磨损寿命,并提出其计算方法。通过算例计算,得出不同工况三种摆动方式下自润滑向心关节轴承磨损寿命比,与已有理论计算结果和试验结果相近,尤其在复合摆动工况下与已有理论计算值相差更小,相对误差小于6%。新建模型为向心关节轴承提供了一种新的寿命计算方法,可以弥补现有寿命计算公式大多仅考虑旋转摆动工况的不足。 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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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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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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Modern methods of implementation of the rule of positive gradient of mechanical properties are considered; this rule was formulated by I.V. Kragelskii and its application serves to minimize the friction and wear of solids. The given methods include the application of coatings with the method of finishing antifricton abrasion-free treatment; application of new metal-cladding lubricating materials; and creation of a nanostructural state of the surface iron nitride layer by nitriding steel with a positive gradient of hardness normal to the surface. 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