共查询到18条相似文献,搜索用时 593 毫秒
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采用LSDYNA软件对某标杆车的滑移门保持件进行仿真分析,并根据国家法规GB15086—2013的要求进行了试验验证。对滑移门系统的中导轨、挂钩和后锁结构布置进行参数化设计,并结合最优拉丁超立方采样方法和径向基函数神经网络模型构建车门与门框最大分离距离的近似模型。最后,采用第二代非支配遗传算法(NSGA-II)对中导轨、挂钩和后锁高度方向的距离进行多目标优化。结果表明:车门与门框上端和下端最大分离距离分别为65.42和65.99 mm,导轮未从导轨中脱开,且B柱和C柱侧加载板总位移量均小于300 mm,保持件性能满足国家标准的要求。 相似文献
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采用最优拉丁方实验设计方法获得样本数据,并用响应面方法构建了滑移门开启过程平顺性、NVH性能多学科系统的近似模型。以滑移门上中下3根导轨形状、门内外板和加强板厚度等作为设计变量,利用序列二次规划法对此近似模型进行优化,结果提高了滑移门开启过程中平顺性和NVH性能,减轻了滑移门系统的质量。 相似文献
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钢-混组合结构的有限元仿真分析的关键在于材料模型的准确模拟。文章基于混凝土损伤理论建立了混凝土榫的数值仿真模型,分析了混凝土榫荷载-滑移曲线、孔中混凝土有效承压面积及破坏机理,并与试验结果进行了比较。结果表明,模拟方法是可行的。 相似文献
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本文采用基于逻辑门限值的ABS控制方法,研究如何提升汽车在湿滑等复杂路面的制动性能。首先建立了单轮汽车系统动力学模型、轮胎模型、制动系统模型等,将汽车滑移率控制在0.17~0.2范围内,在Simulink中搭建制动系统的ABS控制仿真模型并进行离线仿真;仿真结果表明:采用逻辑门限值ABS控制方法可使制动距离减少12.5%,制动时间缩短6.25%,同时可将滑移率控制在最佳滑移率附近,对于提升汽车的制动性能和行驶安全性能有很大帮助。 相似文献
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结合仿真、试验及集成优化技术,提出一种背门连接界面等效刚度的辨识方法。建立背门有限元模型,并对背门连接界面参数进行等效;分别对背门模态进行仿真分析和试验测试,并揭示引起仿真与试验结果差异的原因;通过集成优化技术对连接界面等效刚度进行多目标优化,使背门模态仿真值与试验值相一致。分析结果表明,背门连接界面等效刚度赋值存在偏差,经过参数优化得到合理的赋值,有效提升了仿真分析与试验测试结果的一致性,实现背门连接界面等效刚度从经验赋值提升到基于仿真和测试相结合的精确赋值。 相似文献
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为提升车门动态关闭疲劳损伤计算精度,基于 Abaqus仿真不同压缩速率下密封条压缩载荷-压缩量曲线,通过最小二乘法拟合得到密封条动态压缩曲线非线性函数关键参数;在车门动态关闭瞬态响应分析模型中运用密封条动态压缩载荷-变形函数;设计车门开闭耐久试验对标验证锁点力值和损伤。研究结果表明,应用密封条动态压缩载荷函数曲线仿真的锁扣载荷瞬态响应与试验测试力值偏差小且变化趋势基本一致,车门动态关闭疲劳仿真预测结果与耐久试验高度吻合。密封条动态压缩阻尼效应对提升车门关闭耐久仿真精度有重要意义。 相似文献
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针对在车门开闭耐久试验过程中,某样车车门出现的焊点疲劳开裂问题,在考虑铰链连接、密封条连接及焊点细化建模的前提下,建立车门开闭耐久仿真有限元模型;根据Miner线性疲劳累计损伤理论,对车门开闭模型进行疲劳仿真分析,找出结构设计的风险点。在此基础上,提出优化方案,进行仿真疲劳寿命预测,最终通过试验验证了优化方案的有效性。提出了一种针对车门开闭耐久试验中焊点开裂的疲劳分析优化方法,可以在产品设计开发阶段,准确地发现问题并快速解决问题,可以缩短开发周期,节省开发费用,具有一定的工程实用价值。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1331-1348
Full-scale roller rigs for tests on a single axle enable the investigation of several dynamics and durability problems related with the design and operation of the railway rolling stock. In order to exploit the best potential of this test equipment, appropriate test procedures need to be defined, particularly in terms of actuators’ references, to make sure that meaningful wheel –rail contact conditions can be reproduced. The aim of this paper is to propose a new methodology to define the forces to be generated by the actuators in the rig in order to best reproduce the behaviour of a wheel set and especially the wheel –rail contact forces in a running condition of interest as obtained either from multi-body system (MBS) simulation or from on-track measurements. The method is supported by the use of a mathematical model of the roller rig and uses an iterative correction scheme, comparing the time histories of the contact force components from the roller rig test as predicted by the mathematical model to a set of target contact force time histories. Two methods are introduced, the first one considering a standard arrangement of the roller rig, the second one assuming that a differential gear is introduced in the rig, allowing different rolling speeds of the two rollers. Results are presented showing that the deviation of the roller rig test results from the considered targets can be kept within low tolerances (1% approximately) as far as the vertical and lateral contact forces on both wheels are concerned. For the longitudinal forces, larger deviations are obtained except in the case where a differential gear is introduced. 相似文献
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基于仿真分析的轿车门框密封条装配结构改进研究 总被引:1,自引:0,他引:1
借助MARC有限元分析方法,对某款具有代表性的单泡管型门框密封条进行插拔变形和弯曲变形模拟分析.根据变形过程和仿真结果,确定原设计存在装配困难、容易脱落及弯曲塌陷等问题,并提出相应的改进方案.通过计算机仿真、零件性能测试和装车效果评价相结合的方法,验证了装配结构改进后的门框密封条在插拔性能和弯曲性能上均能满足设计要求. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1622-1641
Wheel set flange derailment criteria for railway vehicles are derived and the influence of wheel–rail contact parameters is studied. An indirect method for wheel–rail force measurement based on these derailment evaluation criteria is proposed. Laboratory tests for the calibration of strain–force devices on the bearing box are carried out to determine the relationship between the applied force and the measured strain. The simulation package, SIMPACK, is used to develop a passenger car model to generate wheel–rail forces and vibration signals. Different cases are considered in this model to provide an accurate validation of the identified wheel–rail forces. A feasibility test is conducted in the Beijing Loop test line using a passenger car equipped with a set of strain gauges on the wheel set. The comparison of the force time history applied to the instrumented wheel set and that obtained using the indirect method is presented. 相似文献