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以汽车落地骨架零件为具体研究对象,利用LS-DYNA的动态有限元显式算法,研究冲压成形有限元数值模拟技术中影响模拟质量的重要因素,如网格质量、时间步长控制、渗透控制、沙漏控制,对汽车骨架类零件冲压成形数值模拟质量的影响。这对于有限元数值模拟技术在实际生产中的应用能够起到有益的指导作用。 相似文献
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桥梁结构的自振特性是结构动力分析和抗震分析的重要参数。该文通过建立有限元模型进行模态分析和动荷载试验分析来获得中承式钢筋混凝土拱桥的计算和实测自振特性,并测得了桥梁的自振频率、振型和阻尼比,并对实桥测试结果和计算结果进行分析、比较,得到该桥在动力荷载下的实际工作状态,以此判断该桥整体结构的安全承载能力和使用条件。 相似文献
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You-Qun Zhao Yao-Ji Deng Fen Lin Ming-Min Zhu Zhen Xiao 《International Journal of Automotive Technology》2018,19(3):499-508
The transient dynamic characteristic of a tire, which has a significant effect on vehicle handling stability and ride comfort, is difficult to study in detail because of its highly non-linear behavior. In this study, the transient dynamic characteristics of a non-pneumatic wheel, called the mechanical elastic wheel (MEW), which was rolling over a ditch were investigated by the explicit dynamic finite element (FE) method. A three-dimensional FE model of MEW considering geometric nonlinearity, material nonlinearity and large contact deformation between the wheel and the road, was established. For the validation of the accuracy and reliability of the FE model of MEW, the simulation and the experimental results of the radial stiffness and footprint of MEW were compared and analyzed. A dynamic simulation of the validated FE model of MEW rolling over a ditch was conducted using the ABAQUS/Explicit program. The equivalent stress and the contact stress generated during the process of the rolling MEW impacting the ditch were studied in detail. The effect of the rolling speed on the transient dynamic characteristics was also analyzed based on the simulation results. The simulation results could provide guidance for the optimization of the MEW structure and vehicle dynamics. 相似文献
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联合模态柔度和静力位移的桥梁有限元模型修正方法 总被引:3,自引:0,他引:3
利用商用软件ANSYS提供的零阶和一阶优化算法,通过1个仿真简支梁有限元模型修正算例,比较了不同目标函数的有限元模型修正效果,提出了一种联合动力模态柔度和静力位移的有限元模型修正方法,并将这种方法运用于一座加固后的刚架拱桥的有限元模型修正,建立起了该桥加固后的基准有限元模型。结果表明:利用修正后的刚架拱桥有限元模型计算的静、动力特性与实测结果吻合良好,这种联合静、动力的有限元模型修正方法具有比较好的模型修正效果,修正后的桥梁有限元模型可以服务于桥梁健康监测和安全评估。 相似文献
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B. Kim Y. Kim D. M. Chun S. H. Ahn J. D. Jang 《International Journal of Automotive Technology》2009,10(1):73-77
Improving the durability of an automotive V-belt pulley, which is commonly used in an automotive powertrain to transfer power
to other parts, is discussed. Fatigue life of the original V-belt pulley is predicted based on damage analysis by finite element
analysis (FEA). Stress history of the pulley during operation was found by performing consecutive static analyses on the pulley
as the pulley rotates. Assembly load (due to the tightening of the bolts) and operation load were considered to describe the
actual load conditions in a durability test. The contact condition from the belt was calculated and applied to the surface
of the pulley. Static analyses at 36 different positions of the pulley, every ten degrees of rotation, were performed to determine
the stress history of the pulley during operation. Using stress history data calculated from FE analysis, damage over one
rotation of the pulley was calculated and fatigue life, in number of rotations to failure, was estimated. An improvement to
the durability of the pulley was investigated by modifying the design of the pulley using FE analysis results. Durability
tests for the pulleys used in the analysis were carried out to verify the analytical results. Comparison between analysis
and experimental results showed that analytical results correlated with the experimental results closely. 相似文献
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提出了大跨斜拉桥索塔有限元模型的阶次误差、结构误差和参数误差的分层次修正方法。根据润扬斜拉桥索塔的设计图纸,在索塔有限元模型的阶次误差分析和结构误差分析基础上,确定了索塔单元划分的数目和梁柱节点刚域的计算参数。在此基础上,采用基于灵敏度分析的模型参数修正方法,结合索塔动力特性的测试结果对索塔的初始有限元模型进行了动力修正。模型修正与验证结果表明,索塔模型参数的修正必须考虑梁柱节点刚域的影响以及修正参数的上、下限值约束。修正后的润扬斜拉桥索塔模型能全面、正确地反映索塔结构的动力特性,可作为索塔结构健康监测与安全评估的基准有限元模型。 相似文献
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对某轿车白车身进行了计算模态分析,得到其计算模态频率以及相应的振型,并通过试验得到试验模态频率及振型,根据振型相关性理论,对试验和计算模态及振型进行相关性分析,将有限元的动态分析与试验数据有机地结合起来,验证了白车身有限元模型。 相似文献
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宽度与跨度之比B/L>1的桥梁一般称之为特宽桥,其受力与普通窄桥有所不同。对一座B/L>1的下承式钢筋混凝土系杆拱桥建立空间有限元计算模型,对其进行静、动力分析,并与平面静力计算分析进行了比较。通过静力计算比较,发现平面计算的内力比空间计算的内力大,但是,平面计算不能反应拱肋和系梁的扭矩;通过动力分析,发现特宽拱桥横向刚度比纵向刚度和竖向刚度小,其横向地震响应相对较大。通过计算分析发现,对于特宽桥梁,应采用空间分析才能满足计算的精度,才能发现一些平面分析无法发现的问题,对于特宽拱桥,尤其要注意其横向刚度的处理。 相似文献
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Hydraulically damped rubber mount (HDM) can effectively attenuate vibrations transmitted between an automotive powertrain
and body/chassis and reduce interior noise in the car compartment. Predicting the dynamic characteristics of a HDM faces challenges
due to fluid-structure interactions between the rubber spring and fluid in the chambers, nonlinear material properties of
the rubber parts and turbulent flow in the chambers and fluid track linking chambers. In this paper, an experimental analysis
and hydrostatic finite element (FE) modeling technique are integrated in a numerical simulation approach to modeling the dynamic
characteristics of a HDM with a lumped-parameter HDM model. The dynamic characteristics of a typical HDM with a fixed decoupler
are predicted and compared with experimental results, which verify the effectiveness of the proposed approach. Moreover, a
parametric effect analysis is performed to demonstrate parameter influence on dynamic characteristic, which provides a concise
design guideline for the parameter adjustments necessary for a HDM to meet the vibration isolation requirements of a powertrain
mount system. 相似文献
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通过有限元分析方法,对大型沥青混合料搅拌设备的塔楼主体机架和筛体进行了模态分析,分析了它们的多阶模态频率和主振型,其结果表明机架和振动筛体的工作频率与其固有频率不重合,保证了其在工作时具有较好的动态性能。 相似文献
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为了验证某轻型载货车车架静动态性能的可靠性,首先基于车架有限元模型对其进行自由模态分析,分析结果表明其固有频率处于激励频率范围之外,满足动态性能要求。然后对其进行模态试验,试验结果表明其仿真分析准确度较高,最后对其进行弯曲刚度和扭转刚度分析,分析结果表明其刚度值均符合工程要求。因此该车架的静动态性能具有较高的可靠性,符合整车使用要求。 相似文献
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本文利用货车驾驶室的测试模态参数来修正其有限元动力分析模型。文中主要论述货车驾驶室模态参数识别、动力分析模型单元组合修正法和货车驾驶室动力模型修改。 相似文献