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1.
跨座式轻轨车与连续轨道梁空间振动分析 总被引:1,自引:0,他引:1
摘 要:提出了一种跨座式轻轨车与连续轨道梁空间耦合振动时域分析方法。桥梁采用常规有限单元模拟,跨座式轻轨车采用弹簧阻尼相连的多刚体模拟,可方便考虑走行轮、导向轮、稳定轮下轨道不平顺的影响,直接建立轻轨车-桥梁时变系统的空间振动方程,采用直接积分法同时求解轻轨车、桥梁的空间动力响应,并编制了相应的计算分析程序。以一联3×30 m的双线连续轨道梁为例,计算了轻轨车以不同车速通过双线轨道梁时全过程车桥动力响应。探讨了不同车速、单线行车、双线对开等不同工况对车桥动力响应的影响。计算结果表明:在设计行车速度下,轻轨车可安全舒适通过该连续轨道梁;桥梁具有良好的整体刚度。该方法可运用于跨座式轻轨车与其它大跨度桥梁的空间振动分析。 相似文献
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介绍了一种自行开发设计的压力机的结构、工作原理.针对该结构,运用ANSYS软件机构分析方法 ,计算在工作冲击下,其最大偏动位移和强度.将模型在ANSYS中做瞬态分析,分析该机器的工作情况,振动情况及危险部位等信息.仿真试验结果 表明该结构在实际应用中满足要求. 相似文献
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由于孔庄煤矿地质条件复杂,巷道淋肩角度大,巷道内电缆和管路较多,人工运输电缆和管路不但会造成电缆和管路的人为损坏,而且在运输过程中容易造成意料不到的其他安全事故。为了改变这种落后低效的运输方法,根据井下现场实际情况,本文介绍了孔庄煤矿的井下现状和现在电缆拖挂单轨吊运行轨道悬吊安装方法。 相似文献
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本文以瞬态动力学理论知识为基础,对某塑料进气歧管进行瞬态动力学分析;仿真分析中,采用发动机全速全负荷工况下的本体时域激励,对进气歧管进行瞬态动力学分析,计算进气歧管谐振腔与节流阀体表面的振动加速度。分析结果表明仿真结果与试验结果基本一致;仿真结果为发动机典型零部件的NVH分析提供了技术支持与理论依据,也为后续振动疲劳分析提供相应的数据支持。 相似文献
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采用通用有限元软件 ANSYS6.1对高速行驶列车上使用的制动电阻器结构进行瞬态动力分析,得到电阻器在各个方向冲击栽荷作用下的应力分布、关键部位的内力响应时程曲线,从而保证其运行的抗冲击性和结构的安全性。 相似文献
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一种适用于成都市内旅游线的悬挂式单轨车造型设计 总被引:2,自引:2,他引:0
目的对适用于成都市内旅游线的悬挂式单轨车造型进行设计研究。方法以成都的轨道交通现状为基础,分析交通与城市旅游的关系,对适用于城市内的几种轨道交通型式进行比较,明确了每种型式的优、缺点;然后将车辆造型与城市地域文化元素相结合,形成具有成都特色的旅游线轨道交通车辆造型设计。结论得出悬挂式单轨车更适合用于城市内的观光线路,并提出在成都市内几个重要旅游景点间建设一条悬挂式单轨旅游线路,以成都元素熊猫为题材,设计出一款具有成都地域特色,适合市内旅游线路专用的悬挂式单轨概念车。 相似文献
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基于多车精细建模的曲线地段重载列车-轨道系统动力性能研究 总被引:1,自引:0,他引:1
建立考虑多车效应的重载列车-轨道系统精细化动力分析模型,对车辆、钩缓装置中各种细部构件及部件间接触摩擦等作用机制进行精细模拟,基于Hertz理论及FASTSIM算法进行轮轨接触计算。利用自主研发设备通过现场参数试验进行轨道建模。深入研究重载铁路曲线地段列车-轨道系统动力性能及曲线参数影响规律。结果表明,缓和曲线地段轮轨相互作用规律复杂,列车不同位置车轮受力呈现迥异变化趋势及幅度,前后缓和曲线轮轨相互作用亦完全不同,主要由超高顺坡及车辆构造所致;缓和曲线长度过短可导致超高顺坡过大不利列车运行,缓和曲线长度对动力性能影响曲线往往存在拐点,建议以拐点值限定最小缓和曲线长度;增长缓和曲线可有效减弱轮轨相互作用,并主要通过减缓列车首车及导向轮对磨耗降低整体磨耗;随缓和曲线长度不断增加,对动力性能改善效果越不明显。我国重载铁路小半径曲线超高设置通常偏大,建议适当降低超高值、设置10%~20%欠超高,利于改善轮轨受力、减缓磨耗。增大曲线半径利于减弱轮轨相互作用及磨耗,但半径越大改善作用越小。 相似文献
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本文利用传递矩阵法建立多质量滑动轴承-转子系统的运动微分方程,考虑了油膜非线性的影响,并对此系统在不同转速区域的涡动轨道及其稳定性进行了瞬态分析。研究结果表明,在一定的系统参数条件下,滑动轴承-转子系统可以处于稳定的同步涡动或次同步涡动状态,而转子的不平衡度则是影响涡动轨道的频率、幅度及稳定性的重要因素。 相似文献
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V. E. Kahle 《Journal of Failure Analysis and Prevention》2006,6(4):23-28
Three reconditioned rail car couplers, arbitrarily identified as couplers, failed during service due to cracking of the front
face. The three couplers were reportedly upgraded by quenching and tempering to enhance strength and toughness. The objective
of this investigation was to determine the mode of crack propagation and the root cause of the observed failures.
Verl E. (Bud) Kahle, P.E., was a professional failure analyst for more than forty years. After receiving his Bachelor of Science
degree in physical metallurgy from Washington State University 1957, Bud was employed by the General Electric Company at a
facility in Hanford, Washington. He later was employed by the Aerojet General Corporation and eventually was head of the Southern
Pacific Materials Science Laboratory in Sacramento. After retirement from Southern Pacific he owned and operated his own firm,
Kahle Metallurgical Consulting Services, for fifteen years. He came to be known as “the man with the answers” to clients in
a variety of industries. Bud was a Life Member of ASM International.
Many of Bud’s clients remarked on the high quality of his failure analysis case histories and encouraged him to have them
published. After Bud passed away in 1999, his wife, Suzanne, approached ASM International to see if the society would be interested
in publishing any of his work. Mrs. Kahle was able to supply a large number of reports, which Bud had carefully archived over
the years. Journal of Failure Analysis and Prevention Associate Editor Michael Stevenson read through the collected case histories, selected the ones to be included in this issue,
and edited them for journal publication.
ASM International wishes to thank Mrs. Kahle for providing these case histories for publication. 相似文献
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S. IWNICKI 《Fatigue & Fracture of Engineering Materials & Structures》2003,26(10):887-900
This paper summarizes the forces that develop in the contact patch between the wheel and rail in a railway vehicle. The ways that these forces govern the behaviour of a vehicle running on straight and curved track are explained and the methods commonly used to calculate and utilize the forces summarized. As an illustration, the results from a computer simulation of a typical UK passenger train are presented and certain aspects examined. 相似文献
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利用ANSYS Workbench对扭矩扳手检定装置受力杆进行静力学分析,模拟其对扭矩扳手进行扭矩值检定时受到应力、应变及变形的情况,根据得到的数据对其进行结构优化设计、轻量化设计。 相似文献
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This paper carries out a discussion concerning kernels in two-dimensional BEM analysis of transient scalar wave propagation problems. Kernels obtained after performing analytical time integration are compared. An example of quadratic time variation is presented in order to illustrate some of the mathematical concepts discussed. 相似文献
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钢轨隐伤病害在重载铁路中大量存在,病害发展后期会导致病害位置整个轨道-路基动态响应增大,严重影响轨道-路基正常服役状态。为研究重载铁路典型隐伤病害产生后对整个轨道-路基的时频域影响特征,开展了现场静态测试与病害原因分析,以及分别进行了病害断面和正常断面的动态行车测试对比试验,得出了病害断面的时频域及振动传递特征。结果表明:病害断面钢轨轨头存在局部低塌、剥离掉块及多裂纹病害,轨头表面会存在明显的裂纹扩展区,其呈Y型扩展并有贯通整个轨头的趋势。病害断面轨道-路基振动明显较正常断面大,其中钢轨、轨枕、道床及路基振动大小均值分别是正常断面的26倍、23倍、13倍及5倍;病害断面轨道-路基频谱峰值存在转向架和邻轴距为基频10 Hz左右的周期性调制频率;病害断面轨枕下道砟粉化严重导致振动能量在2000 Hz附近几乎无衰减,而正常断面在2000 Hz附近由上至下各层之间振动能量依次减小;车速增大对病害断面钢轨振动冲击影响最强烈,对其下部轨枕及路基影响在45~75 km/h内逐渐减弱。 相似文献
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The thermophysical properties (thermal diffusivity, effusivity) of a film coated on a substrate have been measured by a pulsed transient analysis. The experimental approach is to utilize the film surface temperature decay following a heating pulse from a Q-switched Nd:glass laser. The temperature decay was measured using a HgCdTe infrared detector. Following the collection of data, a nonlinear least-squares regression was performed to estimate the optimal values of three separate thermal parameters by fitting the data to the semiinfinite substrate model solution. The model was checked systematically by analysis of the sensitivity and correlation of the three parameters, and the thermal diffusivity and effusivity ratio of the film and substrate were obtained from the optimal values of the estimated parameters. 相似文献
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介绍在某钢厂40000m3/h空分设备安装过程中发生的一起火灾事故,叙述火灾事故现场勘察工作,分析了火灾事故的原因对空分设备精馏塔器的破坏程度,为防止类似事故的再次发生,提出了一些防范措施。 相似文献
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李强 《制冷与空调(北京)》2011,(3):94-97
描述我国风机盘管机组噪声问题的现状,分析导致风机盘管机组噪声的3个主要因素,并着重阐述低频噪声的判断方法以及施工规范对预防风机盘管机组噪声的重要性。 相似文献