APDL实现空气弹簧动态试验仿真

介绍了EQ6111空气弹簧的试验方法和结构材料特点，并针对性地在ANSYS中建立了空气弹簧的三维有限元模型。针对空气弹簧分析过程中所存在的气压载荷问题，采取多步分析的思路，基于离散求和法APDL编写胶囊容积计算宏，应用于空气弹簧的垂向和横向动态力学性能分析，得出了位移载荷频率分别为0．5Hz，1Hz，2Hz和2．5Hz下的横向和垂向动态力学性能分析结果。研究表明，载荷频率是影响空气弹簧动态力学性能的关键外在因素之一。本文的研究为更进一步的空气弹簧动态力学性能的有限元分析奠定了基础。     

基于Abaqus的悬架空气弹簧静态力学特性研究

以某商用车悬架用空气弹簧为研究对象,应用非线性有限元分析软件Abaqus建立了空气弹簧的有限元分析模型,对其垂向静态力学特性进行了计算分析,并与悬架空气弹簧垂向静态力学特性台架试验结果进行对比.结果表明,仿真计算结果与试验结果吻合度较好,证明数值仿真方法可用于悬架空气弹簧设计开发.     

空气弹簧静态刚度的CAE研究

首先简要介绍了空气弹簧的传统设计方法和一些非线性问题，然后针对空气弹簧静态刚度的CAE研究进行了阐释。应用AUTO LISP程序实现AUTO CAD与有限元程序ANSYS的接口，利用有限元分析软件ANSYS建立了空气弹簧（以EQ6111为例）的三维非线性有限元模型。在所建立的空气弹簧有限元模型的基础之上，计算了空气弹簧的静态刚度并分别给出了相应的图形及关系曲线。本文的分析结果与试验结果符合良好。本文的研究对空气弹簧的仿真分析有一定的参考价值，并为进行下一步的动态特性分析提供参考。     

商用车膜式空气弹簧静刚度的有限元分析

以商用车底盘用膜式空气弹簧（简称膜式空气弹簧）为研究对象,对其静刚度进行有限元分析,并与试验结果进行对比。结果表明：采用流体腔法表征气囊内腔气体压力更符合膜式空气弹簧的实际工作过程;采用膜单元法和嵌入单元法对膜式空气弹簧气囊囊皮进行建模,对其静刚度曲线的整体趋势影响很小,但在大行程工况下静刚度存在差异;为了更好地反映气囊囊皮结构对膜式空气弹簧静刚度的影响,推荐采用流体腔法和嵌入单元法进行膜式空气弹簧静刚度仿真。     

空气弹簧有限元仿真方法的研究

介绍空气弹簧有限元仿真步骤,对螺钉紧固式和自密封式空气弹簧进行仿真模拟,并进行试验对比。利用螺钉紧固式空气弹簧仿真模型计算了胶囊的性能;利用自密封式空气弹簧仿真模型计算了整个空气弹簧(胶囊和辅助弹簧)的性能,包括胶囊气腔和附加气室在不同气体交换粘度下的空气弹簧载荷-气压关系、垂向刚度和横向刚度,据此提出空气弹簧的仿真模拟方案:先根据少量试验数据对比垂向刚度结果,优化出符合真实条件的空气弹簧系统的粘性特征,在此粘性条件下计算其他工况下空气弹簧的性能参数。     

基于变帘线参数的商用车膜式空气弹簧刚度特性研究

运用非线性有限元分析软件Abaqus建立膜式空气弹簧有限元模型,对其刚度特性进行仿真模拟分析,讨论帘线角、帘布层间距、帘布层数和帘线密度等橡胶气囊帘线参数对空气弹簧垂直和横向刚度特性的影响。结果表明,膜式空气弹簧刚度随着帘线角和帘布层数增大、帘布层间距减小而提高,而帘线密度的影响很小。有限元分析结果与试验数据之间的误差不超过5%,证明该模型是有效的。     

初始内压和帘线间距对膜式空气弹簧横向刚度特性影响的有限元分析

运用ABAQUS分析软件建立膜式空气弹簧的有限元模型,通过仿真计算获得负荷-横向位移曲线,研究初始内压和帘线间距对膜式空气弹簧横向刚度的影响。结果表明,空气弹簧的横向刚度随着初始内压的提高而增大,同时由于空气弹簧膨胀造成帘线间距增大,引起横向刚度降低。本研究为膜式空气弹簧设计中合理选择初始内压和帘线间距提供了参考。     

胶接接头有限元模拟方法研究

总结胶接接头的标准单元模拟方法,建立接头相应的有限元模型,将各种接头的有限元计算刚度与试验刚度进行对比分析。研究结果表明:弹簧单元模拟精度最高,但建模效率较低;实体单元建模效率较高,但模拟精度不及弹簧单元。该结论为胶接结构有限元分析提供一定的参考价值。     

膜式空气弹簧刚度特性影响因素研究

介绍空气弹簧刚度特性的影响因素,并利用有限元分析软件ABAQUS建立膜式空气弹簧有限元模型,分析气压对空气弹簧刚度特性的影响。结果表明,气压是影响膜式空气弹簧刚度特性的重要因素,随着气压的提高,弹簧的垂向和横向承载能力均增大。     

膜式空气弹簧力学特性有限元分析

膜式空气弹簧作为空气悬架的关键部件,其刚度特性已经成为决定汽车性能的关键因素之一。通过非线性有限元软件ABAQUS对其刚度特性及影响因素进行分析,在仿真过程中选择Mooney-Rivlin模型作为橡胶材料的超弹性本构模型,采用ABAQUS中的Rebar单元进行帘线层的模拟,对气体和囊壁之间的气固耦合进行了详细的模拟分析。在考虑了非线性和接触问题后,建立了空气弹簧的三维非线性有限元模型。最后,通过分别改变对空气弹簧特性影响较大的初始内压、帘线层数和帘线层间距三个方面对弹簧的刚度特性进行了研究,结果为空气弹簧在帘线层方面的设计与优化提供了参考。     

Nonlinear finite element analysis of bond-slip performance of recycled aggregate concrete filled circular steel tube

The aim of this paper is to solve the problem of extremely difficult, low work efficiency and low accuracy of finite element analysis (FEA) when considering the bond-slip performance of recycled aggregate concrete filled circular steel tube (RACFCST). Toward this end, spring elements generation software for RACFCST V1.0, parametric modeling software for push-out test of RACFCST V1.0, and the Nodes selection program for RACFCST were developed. The FEA model of the RACFCST push-out test was established with the software and the model was calculated in ABAQUS, the calculated results were compared with the existing test results. The results show that: (1) The FEA model of RACFCST components considering bond-slip can be efficiently, accurately and simply established by spring elements generation software for RACFCST V1.0; (2) The results of FEA were found to be in good agreement with the experimental data, and spring elements generation software can solve the problem of FEA of RACFCST considering bond-slip performance; (3) The modeling efficiency and accuracy of RACFCST components can be greatly improved by Parametric modeling software for push-out test of RACFCST V1.0; (4) The efficiency and flexibility of selecting nodes during post-processing is greatly improved by Nodes selection program for RACFCST V1.0.     

橡胶衬套静刚度有限元分析与测试技术的应用现状

当前我国国民经济飞速发展,随着人们对于出行要求的不断提高,汽车的数量也在快速增加。橡胶衬套广泛应用于汽车悬架,其能够很好的起到减震的作用,也能够大大提高汽车悬架的使用寿命。作为汽车悬架的重要部件,橡胶衬套的静刚度很大程度上会影响汽车的NVH性能,刚度越小减震效果越好,但容易引起共振带来抖动,反之,静刚度过大不利于隔离震动,因而对于橡胶衬套静刚度的测试分析十分有必要。合适的静刚度能够最大限度地提高车辆行驶的舒适性,也能够在一定程度上保证行车安全。以下就橡胶衬套静刚度的有限元分析与测试技术进行简要的分析研究。     

Study of failure behaviors of rigid polyurethane foam treated under thermal and vibration conditions by experiment and numerical simulation

Failure mechanism of rigid polyurethane foam (RPUF) treated under different conditions was studied by means of experiments and numerical simulation. Thermal degradation mechanism of RPUF under different temperatures was characterized by thermogravimetric analysis-Fourier transform infrared spectrometry coupled with gas chromatography–mass spectrometry (TG-FTIR-GC–MS) in air and nitrogen atmosphere, respectively. And the vibration failure mechanism of RPUF was analyzed by finite element analysis (FEA) and extended finite element method (XFEM). The experimental results indicated that the failure mode in nitrogen was the broken of carbamate groups, and in air was the broken of carbamate groups and the radical decomposition of ether groups. Numerical simulation suggested that there was vibration stress concentration in the center of foam prism, which was easy to produce sliding and opening fatigue cracks during random vibration.     

Fluent二次开发及轮胎花纹沟泵气噪声流场分析方法

运用Abaqus对12.00R20全钢载重子午线轮胎进行纯滚动工况下的有限元分析,导出轮胎花纹块沟槽外表面节点的位置、单元和速度文件,并对计算流体力学软件Fluent进行二次开发。结合有限元数据,运用Fluent对轮胎花纹沟在纯滚动过程中产生的泵气噪声进行三维流场数值模拟,计算3种典型花纹沟的压力场,最后积分求解远场点噪声值,比较3种轮胎模型的噪声特性。计算结果与实验和理论分析的结论相符合。     

基于流固耦合的带附加气室空气弹簧的力学特性研究

应用流固耦合和有限元理论,通过ABAQUS软件仿真分析附加气室容积和节流口直径变化对带附加气室空气弹簧弹性力学特性的影响.结果表明:在一定范围内附加气室容积和节流口直径变化对空气弹簧的垂直刚度有明显的影响.     

Analysis of composite single lap joints using numerical and experimental approach

Adhesives are widely used to execute the assembly of aerospace and automotive structures due to their ability to join dissimilar materials, reduced stress concentration, and improved fatigue resistance. The mechanical behavior of adhesive joints can be studied either using analytical models or by conducting mechanical tests. However, the complexity owing to multiple interfaces, layers with different properties, material and geometric nonlinearity and its three-dimensional nature combine to increase the difficulty in obtaining an overall system of governing equations to predict the joint behavior. On the other hand, experiments are often time consuming and expensive due to a number of parameters involved. Finite element analysis (FEA) is profoundly used in recent years to overcome these limitations. The work presented in this paper involves the finite element modeling and analysis of a composite single lap joint where the adhesive–adherend interface region was modeled using connector elements. The computed stresses were compared with the experimental stresses obtained using digital image correlation technique. The results showed an agreement. Further, the failure load predicted using FEA was found to be closer to the actual failure load obtained by mechanical tests.     

Selective use of rubber toughening to optimize lap-joint strength

This paper introduces a novel approach to increasing the lap joint strength, different from the traditional methods of either increasing the lap joint area or altering the joint geometry. This is accomplished by the selective use of rubber toughening in epoxy to optimize lap joint strength. This was accomplished in three stages. In the first stage an adduct was prepared, this was used to make bulk tensile specimens to calculate the bulk properties for various concentrations of rubber, i.e. 0, 10, and 20 parts per hundred parts of resin (epoxy). In the second stage finite element models were developed using the bulk properties previously obtained. Interfacial stresses were used to access the trends obtained by the selective use of rubber toughening at different locations of the overlap in different configurations. The modeling of adhesive joints was done using ALGOR 2-D, linear and nonlinear finite element analyses (FEA). In the third stage, tensile shear tests conducted on the lap joints validated the trends from the finite element models. Finite element modeling and meshing of the lap joints having 25.4 and 50.8 mm adhesive overlap lengths were completed. Different configurations of rubber toughened and untoughened adhesive were tried in these two overlaps. The validation was done by lap joint tests conducted on an Instron mechanical tester coupled with an extensometer. Comparable strengths were obtained for completely toughened overlap and the configuration where only the edges of the adhesive overlap were toughened and the region in-between was untoughened. Also, the nonlinear FEA was shown to represent the experimental results more closely than the linear approach.