桥式起重机CAD／CAE系统的软件开发

以桥式起重机的整机结构为对象,以优化设计的数据为参数,实现桥式起重机的CAD/CAE系统软件开发,进行桥式起重机结构的参数化设计研究.     

基于Solid Works的机械产品参数化设计研究

针对桥式起重机结构特点,利用参数化设计思想及面向对象方法开发了基于Solid-Works的桥式起重机参数化设计平台.该平台以SolidWorks/APl模块为基础,采用_ActiveX与尺寸驱动参数化技术实现了桥式起重机三维模型的快速建立.通过.dll文件的数据嵌入与动态链接,将VB开发的设计平台与CAD/CAE进行无缝集成,使设计具有很好的继承性与集成性.     

大吨位桥式起重机主梁跨端变截面处有限元分析

以起重量为200t,跨度为31m的桥式起重机为例,运用Visual C++6.0对ANSYS进行二次开发,借助ANSYS自带的参数化设计语言(APDL),根据桥式起重机桥架结构的特点采用自底向上的方法建立桥架结构的参数化有限元模型,并实现有限元分析过程的程序化.在此基础上,着力研究影响主梁跨端变截面处应力分布的各个因素,为今后大吨位桥式起重机主梁跨端变截面处的合理设计提供参考.     

基于ANSYS的桥式起重机多目标动态优化设计

针对目前桥式起重机设计大多以静强度作为主要设计准则,设计模型修改困难等问题,以浙江金港船业的10t-34．5m桥式起重机整体结构为设计原型,采用有限元法动态分析理论,建立系列通用的桥式起重机有限元参数化模型,并对其进行动态分析,分析结果作为优化设计模型的目标函数。采用改进的非支配排序遗传算法（NSGA—Ⅱ）,对结构进行多目标动态优化设计,有效减轻了桥式起重机的质量,提高了桥式起重机金属结构的动态性能,为桥式起重机的设计提供了一定的理论依据。     

基于VC++的专业机械CAD系统研究

为开发起重机行业专用的参数化快速设计系统,以桥式起重机整机结构为对象,VC++为开发工具,利用二次开发和面向对象技术的思想,采用一种新的串行结构的混合全局寻优策略和命令文件接口技术,进行通用桥式起重机结构的参数化CAD系统研究。所开发的桥式起重机专用CAD软件,能够完成从设计、计算直到参数化绘图的全部过程,实现了智能劳动自动化,提高了企业的竞争力和技术创新能力,为行业提供了现代设计手段。     

桥式起重机主梁的三维参数化设计系统研究

以So lidW orks为设计平台,依据桥式起重机主梁的结构特点,采用自顶向下的设计方法对桥式起重机主梁进行参数化建模,并利用V isua l B as ic进行二次开发,完成了主梁系列产品的参数化设计系统。     

通用桥式起重机结构优化设计及计算软件的开发

目前,国产通用桥式起重机结构设计计算大多数仍采用经验设计,不能将设计人员从大量繁琐的重复劳动中解放出来.为此,采用许用应力和极限状态设计法分别对通用桥式起重机进行结构分析,建立优化数学模型,采用正交网格法进行参数优化,以Widows为平台,VC++6.0为开发工具,采用面向对象的方法开发出一款既可以进行桥式起重机结构优化设计,又可以进行载荷及应力验算的软件.为企业提供既可学又高效的设计计算工具.     

起重机智能快速设计系统的开发

通过对起重机结构特点和设计过程的分析研究,将智能优化设计技术、计算机技术、模块化参数化等技术方法引入到起重机的设计过程中,实现了起重机的智能快速设计。以系列桥式起重机为例,开发了基于知识库和智能优化设计方法的起重机快速设计系统,该系统实现了桥式起重机的快速智能设计,提高了设计资源的利用率,降低了设计成本,对桥式起重机的发展具有重要意义。     

基于桥式起重机结构的参数化绘图系统研究

以桥式起重机整机结构为对象,Windows操作系统为支撑系统,AutoCAD为图形支撑软件,采用高级语言VC++6.0和命令文件SCR接口技术,完成基于参数化的桥式起重机结构二维绘图系统的研究,以优化设计数据为参数,实现桥式起重机的命令文件式参数绘图。     

桥式起重机数字化设计系统的研究与开发

通过对桥式起重机企业的需求分析,将模块化和快速设计技术应用到桥式起重机的设计中。在Visual Studio2010开发环境下,以SQL Server2008为数据库支撑,应用模块化和参数化技术及二次开发技术对桥式起重机设计系统进行开发,实现了桥式起重机整车及各个模块的参数化设计出图。     

用优化方法确定拉拔机传动凸轮曲线参数

通过凸轮机构在冶金设备连续拉拔机上作为运动和动力传动的应用,在研究分析了拉拔机凸轮在设计制造等方面要达到的要求的基础上,运用优化的方法确定了连续拉拔机的凸轮曲线参数,并附有计算实例。为我国今后连续拉拔设备的设计、制造和使用提供参考。     

Optimization of the design parameters of modified die in hydro-mechanical deep drawing using LS-DYNA

The use of a modified die enhances the limiting draw ratio compared to that obtainable in a conventional deep drawing operation. Application of these dies, in conventional deep drawing, eliminated the use of blank holder but enhances the tendency of wrinkling in drawn products. In hydro-mechanical deep drawing process, the punch deforms the blank to its final shape by moving against a controlled pressurized fluid. In this paper, a new concept of the application of modified dies in hydro-mechanical deep drawing is presented. The finite element (FE) simulations of a deep-drawing process using modified dies are performed using the 2-D explicit finite element code LS-DYNA, with the aim of optimization of design parameters and the results are compared with the experimental values. The initial design steps in the design of modified die in finite element simulation were taken from the concept of Tractrix die. The use of Tractrix die enhances the draw ratio but simultaneously increases the tendency of wrinkling. In this paper the design parameters of modified Tractrix die for hydro-mechanical deep drawing are optimized for the successful drawing of cups. It is also experimentally verified that by using such modified dies in hydro-mechanical deep drawing, deeper cups are drawn without wrinkling.     

Application of the fuzzy-based Taguchi method for the structural design of drawing dies

In the sheet metal stamping process for automobiles, the drawing process requires the greatest stamping force, and thus the structure of the drawing dies is the thickest and heaviest among all stamping dies. This study describes how the fuzzy-based Taguchi method can be applied to explore multi-objective optimization in the structural design of drawing dies. Using the lower die of the drawing die for the engine hood??s outer panel as an example, the current study explores four parameters that primarily influence the strength and weight of their structure, namely the rib thickness of the punch open line, the pitch of the structure rib, the thickness of the punch surface, and the thickness of the structure rib. Firstly, CATIA software is used to construct a geometric model of the drawing die, and a structural analysis of the model is performed. Next, within the constraints of allowable stress, allowable deflection and allowable size and pitch of the rib, etc., we apply the Taguchi method to evaluate the allowable characteristics of the two objective functions, namely the deflection and weight of the lower die. Then, through factor effect analysis and analysis of variance, the influences of the design parameters upon the objective functions are determined. Next, a fuzzy logic inference is utilized to obtain the measuring index which results in the optimization of the multiple performance characteristics. Finally, by comparing the results from the maximized design and the results from the original design, it is shown that the deflection of the lower die structure is only increased by 0.0038?mm (8.1%), but its weight can be greatly decreased by 506?kg (12%).     

Uncertainty analysis of deep drawing using surrogate model based probabilistic method

Deep drawing is an important manufacturing process in industry. In order to obtain high-quality products produced by deep drawing, the set of design variables used in forming operation is designed through deterministic optimization. However, in real forming process, the design variables show variability and randomness which will affect the product quality. These uncertainties are an inherent characteristic of nature and cannot be avoided. This paper focuses on uncertainty analysis of deep drawing with the consideration of uncertainties in material parameters and friction. An uncertainty analysis approach which combines the finite element method (FEM) simulation, surrogate modeling, and Monte Carlo simulation (MCS) is presented in this work. The constructed surrogate models are validated and compared by cross validation and error measures. Then Monte Carlos Simulation is conducted by the use of the constructed surrogate model. The surrogate model based probabilistic method used in this paper is an approach with high-efficiency and sufficient accuracy for uncertainty analysis in deep drawing.     

基于许用应力和极限状态设计方法的通用桥式起重机结构CAD

目前,国产通用桥式起重机系列尚未采用参数化设计系统,既不能将设计人员从大量繁琐的重复劳动中解放出来,也不能发挥出CAD／CAM的优势。为此,本文采用许用应力和极限状态设计法分别对通用桥式起重机进行结构分析,建立优化数学模型,采用正交网格法进行参数优化,通过对优化结果的分析,得出2种设计方法的异同性和优劣性。同时优化结果作为二维参数绘图的输入参数,驱动参数绘图软件直接绘图,开发成功一套通用桥式起重机结构CAD软件,实现设计绘图的自动化。     

改进的等效拉延筋阻力模型及其应用

提出了一种改进的等效拉延筋阻力模型，采用三维有限元分析方法对客货箱右／左后门柱内板连接板的拉延成形工序进行模具设计和毛坯几何形状的优化。结合改进的等效拉延筋阻力模型，采用非线性约束优化算法对拉延筋结构进行了优化设计。根据有限元分析和优化设计结果进行实冲实验可得到质量良好的覆盖件产品，并且其典型截面的厚度分布与实验结果吻合良好，证明了改进的等效拉延筋阻力模型能准确反映板料通过拉延筋时的摩擦和弯曲阻力。     

金属板料拉深成形工艺参数优化的正交试验研究

成形工艺参数影响金属板料的拉深成形性能,对多道次拉深的影响显著性因素也不一致。针对影响板料拉深成形性能的主要因素,运用正交试验方法确定出了影响首次和二次拉深成形性能的显著性因素。通过优化组合参数,提高了拉深成形效率。     

基于正交试验的半球形拉深成形工艺参数优化

以某半球形TA1钛合金拉深成形件为例,通过ABAQUS有限元软件建立了拉深成形三位模型和数值模拟正交试验方案。以是否破裂和起皱为衡量指标,探究凹凸模间隙、拉深速度和压边力对拉深成形件质量的影响,结果表明:起皱现象主要出现在压边区域不影响成形件质量,对底部最小厚度的影响从大到小依次为拉深速度、压边力以及凹凸模间隙。基于正交试验结果设计优化方案,得到最优工艺参数组合并将其应用于实际生产得到表面质量较好的拉深成形件,结果表明:基于正交试验对拉深成形工艺参数优化的方案可行,可以为企业生产提供指导,具有一定的工程应用价值。     

传动轴冷拔模具结构参数优化仿真设计

利用有限元法对传动轴冷拔过程进行模拟仿真,通过正交实验法研究模具结构参数（工作锥半角a、过渡圆弧半径R、定径带长度t）对传动轴冷拔成形的影响,模拟分析得到最小拉拔力、最小径向压应力及最小等效残余应力条件下最优模具参数组合为-＇Or=5。、尺：5mm、L。=4mm。在此基础上对优化方案和传统的设计方案进行了模拟比较分析,结果表明优化的模具结构比传统的方案更好,有利于提高冷拔制品质量,延长模具寿命。     

基于SolidWorks的液压支架负压除尘器的三维设计

负压除尘器是利用高压水在引射筒内形成的负压作用而实现除尘功能。文中根据设计要求,运用Solid W orks软件建立了液压支架负压除尘器的三维模型,完成总装图、部件图、虚拟装配图,进行了优化研究,提高了设计效率。