共查询到19条相似文献,搜索用时 784 毫秒
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车架作为矿车的主要承载部件,承担来自货厢与货物的载荷,同时将该载荷通过悬挂系统传递到车桥和地面,不平的地面又通过轮胎和悬挂系统将载荷反馈到车架上,导致车架受力情况非常复杂,车架的破坏形式不仅有静强度破坏,还存在疲劳破坏。通过有限元软件ABAQUS完成各典型工况的载荷加载与静强度分析,在疲劳寿命分析软件FE-SAFE中将仿真结果与载荷谱进行拟合,利用Verity方法完成焊缝疲劳寿命分析,对寿命不足的部位进行优化,最终实现车架60000h的理想寿命目标,对大吨位三桥刚性矿车的研发有重要参考意义。 相似文献
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由于在分析高速履带车辆扭杆弹簧疲劳寿命的过程中传统方法采用静态最大载荷计算不能考虑动态载荷的影响,以多柔体动力学和有限元模态应力分析法为分析手段,通过数值仿真计算得到不同载荷作用下履带车辆扭杆弹簧的应力时间历程曲线.依据Miner线性损伤累积理论,结合车辆行驶环境和行驶工况的分配比例和扭杆弹簧材料特性曲线,采用Goodman法和Gerber法2种等效应力修正方法,对扭杆弹簧的疲劳寿命进行分析和预测,其计算结果表明Goodman法比Gerber法保守,两者之间的预测结果相差约7倍.该研究为设计阶段履带车辆关键零部件疲劳寿命预测提供可行的分析方法. 相似文献
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建立汽车发动机舱盖焊点有限元模型,并将分析结果与试验模态对比,验证该有限元模型的准确性.分别采用准静态法和模态应力恢复法得到焊点的应力-时间历程;基于Palmgren-Miner线性损伤累积准则和S-N曲线对比评估焊点疲劳寿命,并在模态应力恢复方法中考虑截止频率和结构阻尼对焊点疲劳寿命的影响.与虚拟台架试验的对比结果表明:准静态预测的焊点寿命大于试验寿命,截止频率为200 Hz且结构阻尼为0.06的模态应力恢复结果与试验结果较吻合.基于模态应力恢复法优化设计的发动机舱盖通过耐久路试. 相似文献
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为提高车轮设计质量,应用有限元方法,根据国家标准,对某型车铝合金车轮进行疲劳寿命分析,并结合试验设计、近似建模技术及基于蒙特卡罗模拟技术的6σ可靠性优化设计理念,从提高车轮寿命、减轻重量角度进行车轮优化设计。结果表明,轮辐上开孔能够有效引导车轮受载情况下的应力分布,改善疲劳载荷的循环特性,从而有效地提高车轮疲劳寿命。通过对车轮进行确定性优化和基于6σ的可靠性优化的对比,分析了设计变量波动对产品设计质量的影响,结果表明,可靠性优化明显优于确定性优化,具有较高的工程实用价值。 相似文献
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张克鹏 《CAD/CAM与制造业信息化》2013,(1):63-66
本文运用CAE前处理软件HyperMesh建立了某牵引车车架的有限元模型,并利用RADIOSS求解器对其进行静强度分析,得到车架横梁的应力云图及相关数据。为了增强车架横梁的强度,提出试验设计方法并使用Hyperworks平台的OptiStruct模块对车架横梁进行优化,得到最优的试验方案。优化结果表明优化方案相比初始设计方案明显降低了车架横梁处的应力,增强了车架横梁的强度,为车架设计与改进提供了设计依据。 相似文献
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针对某型号杆端关节轴承在疲劳试验时发生断裂的问题,对其原结构进行有限元仿真分析,得到的最大应力位置与实际断裂位置吻合,圆柱段仿真结果误差与应力理论计算结果仅为0.5%,验证仿真结果的可靠性。对杆端体各结构参数依次进行单变量有限元仿真分析,获取各参数对杆端体最大应力和质量的影响,据此确定优化顺序并对关节轴承进行优化。优化后的杆端关节轴承质量增加9.8%,最大等效应力降低14.9%,计算疲劳寿命从500万次提高到4 600万次,大于目标疲劳寿命值3 000万次,优化后的样件均顺利通过疲劳试验。 相似文献
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To establish a bridge between grinding tool parameters and loaded tooth fatigue life, an innovative data-driven root flank bending fatigue life forecasting and optimization via Top-Rem tool parameters was proposed for grinding spiral bevel gears. The recent machine settings modification is extended into grinding Top-Rem tool parameters modification in case that geometric accuracy and root bending fatigue life are integrated into a collaborative optimization. The proposed Top-Rem modification includes three key steps: (I) arc-shaped blade, (II) top part, and (III) top fillet part. Then, while root bending stress is determined by using finite element method (FEM)-based simulated loaded tooth contact analysis (SLTCA), data-driven fatigue life forecasting is developed by correlating with the multiaxial fatigue damage model based assessment. Moreover, data-driven bending fatigue life optimization model is established by using Top-Rem tool parameters modification, where the important constraints in target flank determination includes: (i) root overcutting, (ii) geometric accuracy, and, (iii) fatigue life. For high accuracy and efficiency, two different strategies are proposed: (i) the different parameters modification types; and, (ii) sensitivity analysis of grinding Top-Rem tool parameters. Finally, proposed method can verify that bending fatigue life can be significantly improved by modifying the key Top-Rem tool parameters in early stage of the whole life product development for spiral bevel gears. 相似文献
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Zhen Hu Xiaoping Du Daniel Conrad Ray Twohy Michael Walmsley 《Structural and Multidisciplinary Optimization》2014,50(1):9-23
Variations, such as those in product operation environment and material properties, result in random fatigue life. Variations in material fatigue properties depend on stochastic stress responses due to their nonlinear relationships with other random variables such as stochastic loading and dimensions. In this work, an efficient fatigue reliability analysis method is developed to accommodate those uncertainties for structures under cyclic loads with known loading trend. To reduce the computational cost, the method incorporates the fatigue life analysis model and the saddlepoint approximation method with the fast integration method. The new method is applied to the fatigue reliability analysis of a cantilever beam and a door cam. The results show high accuracy and efficiency of the proposed method benchmarked with Monte Carlo Simulations. 相似文献
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介绍结构全寿命和破坏概率的可视化技术,针对ANSYS软件疲劳分析能力的不足,基于ANSYS的TCL/TK,APDL和UIDL开发出相应的可视化模块,并采用该模块分析叉车车架的全寿命和破坏概率,得到的结果与实际相吻合.该研究在增强ANSYS软件的疲劳分析能力的同时,提供1种二次开发方法. 相似文献
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《Advances in Engineering Software》2006,37(10):649-658
In evaluation of the long-term success of a dental implant, the reliability and the stability of the implant–abutment and implant bone interface plays a great role. In general, the success of the treatment depends on many factors affecting the bone–implant, implant–abutment and abutment–prosthesis interfaces. In the literature, many researcher are investigated static loading effects on the implant however dynamic loading and fatigue effects has not investigated formally. In this study, static dynamic and fatigue behaviors of the implant are investigated. Dynamic loads in 5 min applied on occlusal surface. Fatigue life the implant calculated based on Goodman, Soderberg, Gerber and mean-stress fatigue. 相似文献
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《Advances in Engineering Software》2000,31(6):411-415
Methods of optimum design and experimentation were used to ensure sufficient fatigue life in a series of locomotive steel frames having variable cross-sections. These were tested using resonance fatigue loading to establish the optimal fabrication methods for improving fatigue life. Dynamics simulation was used to adjust the system's natural frequency to exciter frequency by optimizing the mass distribution. Shape optimization was done by two methods. The shape was optimized using a nonlinear learning random search algorithm with both weighted and fuzzy goals and with constraints on fatigue life and with a mix of continuous, integer and discrete design variables. The goal was formulated to express customer satisfaction on the cost and technical performance. The shape was also optimized using FEM programs. 相似文献