共查询到19条相似文献,搜索用时 156 毫秒
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轴肩过渡曲线形状设计研究 总被引:1,自引:0,他引:1
将有限元结构分析技术与数学规划方法相结合,对轴肩过渡曲线进行形状优化设计,提出用圆弧蜕变曲线作为轴肩和砂轮越程槽的过渡曲线,以降低轴肩应力集中。给出样条过渡曲线、椭圆过渡曲线、圆弧蜕变过渡曲线设计的设计实例,结果表明:圆弧蜕变曲线设计不仅有效地降低了轴肩应力集中,而且易于加工制造。 相似文献
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借助于Pro/Engineer软件建立了阶梯轴的三维参数化模型.然后将三维模型导入Pro/MECHINICA有限元分析软件中,对受拉状态下不同参数的阶梯轴的局部应力进行了有限元分析,通过对阶梯轴的参数--圆角半径R的灵敏度分析,给出了应力对圆角半径的敏度曲线. 相似文献
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将有限元结构分析技术与教学规划方法相结合,对轴肩过渡曲线进行形状优化设计,提出用圆弧蜕变曲线作为轴肩和秒轮越程槽的过渡曲线,以降低轴肩应力集中。给出样条过渡曲线、椭圆过渡曲线、圆弧蜕变过渡曲线设计的设计实例,结果表明:圆弧蜕变曲线设计不仅有效地降低了轴肩应力集中,而且易于加工制造。 相似文献
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针对注塑机双曲肘内翻式合模装置十字头连杆过渡结构应力集中现象和出现断裂问题,以双曲肘内翻式合模装置为研究对象进行分析,研究并提出了一种采用曲面过渡的设计方法。对合模装置十字头连杆进行了动力学、静力学仿真分析表明过渡处应力集中明显,超出安全系数1.5的许用应力值,是导致十字头连杆断裂的原因。根据圆过渡设计方法中的半径和出现最大应力值位置的关系,提出了一种过渡曲线方程,以该曲线构造过渡曲面,降低过渡结构最大应力值。通过与圆过渡设计方法和楔形面过渡设计方法对比,研究结果表明,该方法对降低过渡处最大应力值具有有效性。 相似文献
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为了分析圆柱滚子式三叉杆万向联轴器圆柱滚子与滑块槽之间的脂润滑状况,基于Ostwald模型建立线接触热弹流脂润滑数值计算模型。结合联轴器的稳态工况参数,采用多重网格法、逐列扫描法对润滑油膜压力、膜厚和平均温升求解;探究不同输入轴与输出轴轴线夹角、不同输入轴回转半径、不同圆柱滚子半径、不同初始黏度和不同流变指数对联轴器热弹流脂润滑特性的影响。研究结果表明:减小输入轴与输出轴轴线夹角、减小输入轴回转半径、减小润滑脂初始黏度有利于降低二次压力峰和平均温升,但膜厚减小;增大圆柱滚子半径有利于降低二次压力峰和平均温升,增大膜厚;增大流变指数,有利于增大膜厚,降低温升,但二次压力峰增大。因此,根据实际工况选择较小回转半径,适当减小轴线夹角和增大圆柱滚子半径,适当减小润滑脂初始黏度和增大流变指数,均有利于改善联轴器润滑特性。 相似文献
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选定JTB-0.8×0.6A型绞车作为研究对象,结合其技术参数进行分析,提出选用NGW作为其行星轮的啮合方式,接着对行星轮系的设计展开分析。通过对太阳轮轴进行基于ANSYS 平台的应力分析,得出轴肩及与齿轮和轴的接触处存在应力集中的现象;通过基于LS-DYNA平台分析计算齿轮的应力应变情况,得出行星齿轮啮合过程中的最大应力集中在太阳轮上。针对分析结果,给出相应的优化对策。 相似文献
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利用有限元法,建立某厂螺杆钻具传动轴的力学模型,从静力学及疲劳两个方面对其性能进行分析。并通过ANSYSWorkbench软件分析确定传动轴可能存在危险点的VonMises应力值。从生产实际出发,提出了两种改进的方案。利用局部应变法中修正后的史密斯公式对传动轴进行寿命预测,为传动轴的设计提供了理论依据。 相似文献
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Fretting causes considerable reduction in the fatigue strength of a shrink-fit assembly and failures through fretting are as numerous as failures from normal fatigue. The purpose of this investigation was to determine the effect of contact pressure and slip amplitude on the fatigue limit, and a favourable value for overhang of hub and fillet radius with constant diameter ratio, at which fretting failure can be avoided and the maximum normal fatigue strength will be obtained. The torsional fatigue strength of shrink-fitted shaft couplings was estimated by tests performed by varying the overhang of the hub, the fillet radius of the shaft and the contact pressure of the shrink-fitted assembly. Press-fitting of the hub overhanging the shoulder was used to increase the contact pressure. The tests were performed using a grooved hub. These experiments showed that fretting was reduced with an increase in contact pressure, because the slip amplitude decreased. The shaft was fractured just inside the end of the fit by fretting fatigue with low contact pressure, but if the contact pressure was very high, the shaft fractured at the fillet by normal fatigue. The fretting fatigue limit at a constant diameter ratio increases with an increase in the fillet radius, and reaches its maximum value at a certain radius using the grooved hub. 相似文献
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Zhi-Jie Liu Yu-Chong Zhao Zhi-Qiang Gan Dong-Lin Hui 《Journal of Mechanical Science and Technology》2018,32(11):5089-5096
Under changeable pumped medium and working environment, the twin-screw pump is prone to be broken by fatigue failures. A structure optimization design model and method of the driving shaft are presented based on response surface methodology and finite element analysis. In this model, the shaft diameter, chamfering degree and the shaft extension of the power end are selected as optimization variables, the limit values of the variables and maximal normal deformation of the spindle are considered as the constraint conditions, and the minimization of the equivalent alternating stress on the dangerous shaft section is taken as the optimization objective so as to improve the shaft fatigue reliability. The optimization results of a case show that the equivalent alternating stress on the dangerous spindle section reduces by 26.2 %, and the maximal normal deformation decreases by 25.2 % compared with the original design. In addition, the infinite life reliability and fatigue safety factors both meet the design requirements. 相似文献
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