基于有限元法的汽车构件疲劳寿命分析

对汽车构件结构疲劳分析和寿命预测方法即静态疲劳分析方法和总寿命S-N预测方法进行了介绍。针对某种型号轿车的悬架,应用多体动力学软件ADAMS构建了悬架的虚拟样机,进行了动力学仿真分析。并应用MSC系列有限元分析和疲劳软件对下控制臂进行分析,计算了其应力特性和疲劳寿命。     

基于ANSYS的某汽车悬架有限元分析

采用某麦弗逊悬架参数,建立悬架系统的三维模型。利用ANSYS Workbench有限元分析软件对悬架进行了三种工况下的静力学分析,得出悬架的强度和刚度特性,并对悬架有限元模型进行了模态分析,将计算得到的悬架固有频率与汽车受到的其他激励频率进行对比,评价该悬架是否具有避开与车辆其他系统产生共振区域的性能,为今后的悬架设计提供了一定的理论基础。     

基于MSC有限元分析的五缸往复泵曲轴疲劳强度校核

针对五缸往复泵曲轴结构形状和受力情况都比较复杂的状况,通过对五拐三支承曲轴建立整体三维模型,在MSC.Patran/MSC.Nastran软件环境下对其进行有限元模态分析,并联合动力学仿真软件MSC.Adams对该曲轴进行瞬态动力学有限元分析,得到曲轴在工作循环中的最大危险点及其应力值,并利用这些数据进行疲劳强度校核.提出了一种基于模态法瞬态有限元分析的曲轴疲劳强度校核的方法,为往复泵曲轴设计和疲劳强度校核计算提供了有价值的指导参考.     

微型多功能车双横臂独立悬架接触强度分析

根据现代接触动力学原理,结合有限元知识,利用三维造型软件Pro/E、网格划分软件HyperMesh及有限元分析软件ANSYS对微型多功能车前双横臂独立悬架进行了接触强度分析.计算结果与试验结果进行对比表明,所建立的有限元模型基本符合原结构的强度特性.     

汽车空气悬架弹簧支架的动力学仿真与有限元分析一体化疲劳寿命计算

简述了弹簧支架在汽车整个空气悬架系统中的作用,针对某种型号客车的空气悬架,应用多体动力学软件ADAMS构建了悬架的虚拟样机,进行了动力学仿真分析。应用ANSYS软件对弹簧支架进行了分析,计算了弹簧支架的应力、变形特性和疲劳寿命。     

修井机车架有限元分析

根据修井机使用的环境、配套设备的尺寸要求及交通运输车辆国标对修井机车体进行了整体设计,包括汽车型式、主要尺寸和参数的设计。利用SolidWorks三维建模软件建立车架的仿真模型。根据平衡悬架的性能,建立了平衡悬架的三种模型并分析了三种模型的瞬态动响应特性,找到最符合平衡悬架特性的模型。应用有限元分析软件ANSYS对车架进行简化并与平衡悬架进行结构静力学联合仿真,校核设计的车架是否符合修井机的使用要求。     

某型弹载电源瞬态热分析

首先介绍了基于弹载平台特点的瞬态热设计和一般稳态热设计的不同之处,然后具体介绍了某型弹载电源的瞬态热传递过程依据热容量进行手工计算的方法,其次介绍了用有限元软件进行瞬态热分析的步骤,并对两种计算结果进行了对比分析并提出了优化方案,最后分别探讨了采取热容理论手工计算和使用有限元软件仿真计算时的注意事项,对处理类似瞬态热传递问题具有参考价值。     

液压平板车悬架系统的有限元分析与结构优化

针对液压悬架强度进行了分析,在UG中建立悬臂和摆臂的三维实体模型,用HyperMesh软件进行划分网格等前处理工作,结合动力学分析得到载荷,然后基于ANSYS进行有限元结构刚度和强度分析.针对计算结果,对悬臂和摆臂的薄弱部位进行了有针对性的结构优化,再次的有限元分析表明优化结果是有效的.     

履带车辆扭力轴有限元分析

建立工程履带车辆扭力轴三维实体模型,运用ANSYS有限元分析软件,计算扭力轴的模态振型,得出了扭力轴扭转振型,并且运用ANSYS进行瞬态动力学分析,得到了各个危险节点的应力大小,对扭力轴进行疲劳强度分析,为将来提出改进措施提供了可靠的理论依据。     

城市电动客车结构疲劳寿命仿真分析

采集了某城市电动客车在水泥混凝土路面下的垂向加速度信息,建立该车7自由度线性系统理论模型和以采集的悬架处加速度信号为输入的瞬态动力学有限元分析模型。计算获得整车的固有频率,动态应力和加速度时程曲线,通过对比由仿真和理论计算获得的整车固有频率,对比仿真和测试获得的车身某点加速度功率谱密度,验证了有限元模型的准确性。利用瞬态动力学的分析结果,采用msc.fatigue对客车骨架进行了疲劳寿命预测,指出结构的薄弱环节。最后建立一种简化模型,对比证明利用该模型快速的估算客车的疲劳寿命是有意义的。     

水平定向钻虚拟样机建模与仿真

为了全面分析水平定向钻的性能，针对不同领域，分别建立了机械、液压、强度和控制等子系统模型，通过参数关联形成了一个完整一致的水平定向钻整机虚拟样机模型。通过对模型的机械系统动力学性能、液压系统管路压力与流量以覆关键部件的应力和应变仿真分析，为实际产品设计与优化提供了理论依据。     

硬盘磁头驱动机构悬架模态分析

使用有限元分析方法对磁头驱动机构的悬架进行模态分析计算，得到它的固有频率和特征振型。并对硬盘进行振动失效试验，验证了有限元分析计算的准确性。为悬架优化设计和硬盘隔振设计提供了理论基础。     

Vibration analysis of HDD actuator with equivalent finite element model of VCM coil

As the rate of increase in areal density of the HDD has accelerated, dynamic characteristics of the HDD actuator need to be improved with respect to the performance of the tracking servo and shock transmission. Therefore, it is important to analyze the vibration characteristic of the HDD actuator that consists of the VCM part, E-block and pivot bearing. In this paper, vibration modes of the HDD actuator are investigated the using finite element and experimental modal analyses methods. To develop a detailed finite element model, finite element models of each components of the actuator assembly are constructed and tuned to the results of the EMA. The VCM coil is modeled as an equivalent finite element model that has an orthotropic material property using auto-model updating program. Auto-model updating program with improved sensitivity based iterative method is applied to build a detailed finite element model using the result of the EMA. A detailed finite element model of the HDD actuator is then constructed and analyzed.     

Head slap simulation for linear and rotary shock impulses

A finite element model of a hard disk drive (HDD) is developed to investigate the response of the HDD to a shock impulse. Two types of shock are of interest, a linear shock and a rotary shock. The linear model corresponds to a HDD being dropped flat onto an impact surface. The rotary model is constrained to rotate about an axis and simulates a HDD standing on one edge that is allowed to drop and impact the opposite edge. The geometry is developed using Pro/E, a CAD package, and is then imported into Hypermesh, a pre- and post-processor. The transient solution is performed using LS-Dyna, a finite element solver. The three software packages are commercially available. Results are shown as animations and time series data. Comparison of the simulation results for the two models is used to develop a correlation between the linear and rotary shock tests.     

基于动态柔度的硬盘驱动臂的拓扑设计

随着硬盘的磁密度越来越高,数据存取速度越来越快,要求硬盘的驱动速度更快,寻道精度更高.在这种苛刻的工作条件下,即使是微小的机械振动也会产生数据的读写错误.为了提高其动态响应特性,重点研究采用基于动态柔度的拓扑方法进行硬盘驱动臂的拓扑形态设计,包括硬盘驱动臂拓扑设计的建模、灵敏度分析、拓扑优化的过程以及对优化结果的分析.通过研究,得到几种新的硬盘驱动臂的结构拓扑形态,发现它们与静态拓扑和基于频率的拓扑设计结果具有一定的局部相似性,这表明基于动态响应的拓扑设计具有更好的综合性能.文中提出的方法为进一步改善HDD(hard disk drive)驱动臂的动态性能提供一种新的途径.     

多连杆式前悬架的转向定位参数仿真计算研究

应用ADAMS软件的CAR模块建立了轿车多连杆式前悬架和转向系统的多体运动学模型,对主销和前轮定位角进行了仿真计算研究。     

Numerical estimation and practical validation of Hooputra’s ductile damage parameters

Forming limit diagram (FLD) is a useful criterion for damage prediction, but not suitable for complex operations. Hooputra’s ductile damage (HDD) is a proper failure criterion which relies on three relatively difficult experimental tests for each material. In this paper, first, using the FLD criterion, the required difficult experimental tests of HDD criterion are simulated and the HDD parameters for St14 steel are numerically estimated. Then, to evaluate the obtained HDD parameters, damage behavior of the material in a number of benchmark tests is numerically predicted, employing the HDD criterion. Finally, the simulated results are compared with the practical observations and the identified HDD parameters are validated. Comparison of the results reveals the HDD parameters can be numerically and properly extracted, utilizing the FLD and avoiding the difficult experimental tests.     

重卡非对称平衡悬架的研究

基于对非对称平衡悬架结构的轴荷不均等分配特性研究,通过增加驱动桥上的轴荷进而加大驱动桥轮胎与地面的摩擦力,从而进一步改善了整车的爬坡动力性能.校核了中后桥中心距平衡悬挂中心长度比为4∶6的样车后悬架系统关键件的可靠性,并根据此原理制造了一辆该平衡悬架结构的样车,通过在试验场进行装配对称平衡悬架结构及非对称平衡悬架结构车...     

水平定向钻机液压系统的设计与分析

水平定向钻机的液压系统是实现其各执行机构运动与控制的关键系统。基于水平定向钻机的结构特点和作业要求，设计了由动力头行走（钻进／回拖）子系统、钻杆旋转子系统以及辅助子系统组成的液压系统，利用功率键合图法对其关键系统进行建模，利用Simulink软件对模型进行仿真分析，得出其动态特性和参数影响关系，并以降低高压油路压力为目标，对系统部分参数进行了优化。分析和设计结果为水平定向钻机疲压系统的进一步完善设计与应用提供了依据。     

General Torsional Stiffness Matching of Off-road Vehicle

Increasing frame torsional stiffness of off-road vehicle will lead to the decrease of body torsional deformation, but the increase of torsional loads of flame and suspension system and the decrease of wheel adhesive weight. In severe case, a certain wheel will be out of contact with road surface. Appropriate matching of body, flame and suspension torsional stiffnesses is a difficult problem for off-road vehicle design. In this paper, these theoretically analytic models of the entire vehicle, body, frame and suspension torsional stiffness are constructed based on the geometry and mechanism of a light off-road vehicle's body, frame and suspension. The body and frame torsional stiffnesses can be calculated by applying body CAE method, meanwhile the suspension's rolling angle stiffness can be obtained by the bench test of the suspension's elastic elements. Through fixing the entire vehicle, using sole timber to raise wheels to simulate the road impact on a certain wheel, the entire vehicle torsional stiffness can be calculated on the geometric relation and loads of testing. Finally some appropriate matching principles of the body, frame and suspension torsional stiffness are summarized according to the test and analysis results. The conclusion can reveal the significance of the suspension torsional stiffness on off-road vehicle's torsion-absorbing capability. The results could serve as a reference for the design of other off-road vehicles.