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面向网络实验教学的虚拟协同装配技术研究 总被引:1,自引:0,他引:1
基于网络实验教学环境下对虚拟协同装配提出的不同需求,分析了其与面向设计的协同装配实现技术之间在定义、目的等方面存在的差异,提出了面向网络教学下虚拟协同装配的概念,并界定了其内涵及实现时需要考虑的因素。研究了支持协同装配的虚拟模型实验室的搭建、虚拟协同装配的语义信息表达模型和装配过程中干涉检测的方法,提出了网络协同虚拟装配实验平台体系的架构方法,并就系统的功能实现、虚拟协同装配执行过程进行了阐述,最后以柱塞泵示例了解系统的初步实现情况。 相似文献
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分析了在计算机上实现虚拟装配的流程及如何用VRML创建三维可视化的虚拟场景,提出一种基于VRML和Java的虚拟现实构建方法,用以增强VRML虚拟场景与外界的交互性,并以球阀为例给出了在网络上创建虚拟装配动画演示的具体方案.该方法不仅可用于演示网络环境下的可视化装配,也适合于其它领域基于Web的科学可视化。 相似文献
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机械产品虚拟装配智能导航技术的研究 总被引:2,自引:0,他引:2
通过对机械产品虚拟装配过程中装配关系的分析,在理解与识别设计者的装配操作和意图基础上,对共线约束和共面约束的智能导航进行了深入研究,实现了机械产品虚拟装配的智能导航.该方法有助于在虚拟装配环境下快速准确地进行零部件虚拟装配,提高产品设计效率. 相似文献
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采用VRML的齿轮变速箱虚拟模型的实现 总被引:2,自引:0,他引:2
分析了当今虚拟现实技术对开发机械产品的影响,提出了利用VRML构建齿轮变速箱虚拟模型的基本方法.利用CAD三维建模软件建立零件模型,根据变速箱的结构特征和工作原理在VRML中编程实现虚拟装配及运动仿真和控制.实现了虚拟模型在网络上的交互式展示,为机械产品的异地设计及结果评估提供了有效方法. 相似文献
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在介绍利用VC进行SolidWorks二次开发的基础上,探讨了基于SolidWorks二次开发的印刷机械虚拟装配系统的各项关键技术,包括装配模型信息的获取和表达、三维环境下交互式装配规划和仿真、现场示教和培训等.实践证明,基于SolidWorks二次开发的方法是一种不错的选择,可大大减少开发时间和成本. 相似文献
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虚拟装配技术是一项全新的设计概念,是虚拟制造中的一项关键技术,可用于产品设计阶段进行预装、验证装配工艺的正确性等多个方面,是利用计算机三维建模技术模拟生成与实体零件相同的模型,并可以按照用户需求进行动态装配的一门新兴的三维应用技术.以单级减速器装配过程为例,介绍用Java3D构造虚拟场景,进行单级减速器装配仿真和信息交互课件开发技术. 相似文献
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目的提供一种具有通用性的虚拟装配零部件设计方法,能够实现多位置、多旋转状态判定的装配方式与灵活的装配序列规划。方法首先使用多个定位触点进行碰撞检测来确定零件的位置和旋转状态,然后使用二进制整数作为零件状态码表达零件间的装配依赖关系,最后通过二进制运算表达式的校验算法限制零件状态码的取值决定零件是否可以装配,从而达到装配序列的约束规划。结果在装配方式上使得所有零件具有通用的设计方案,针对特殊零件只需要设置特殊定位触点,在装配序列规划上实现了多种灵活的装配顺序设计,装配逻辑关系表达更加清晰。结论通过多触点定位和状态校验可以实现具有很好通用性和扩展性的虚拟装配技术。 相似文献
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Quality of an assembly is mainly based on the quality of mating parts. Due to random variation in sources such as materials, machines, operators and measurements, even those mating parts manufactured by the same process vary in their dimensions. When mating parts are assembled linearly, the resulting variation will be the sum of the mating part tolerances. Many assemblies are not able to meet the assembly specification in the available assembly methods. This will decrease the manufacturing system efficiency. Batch selective assembly is helpful to keep the assembly requirement and also to increase the manufacturing system efficiency. In traditional selective assembly, the mating part population is partitioned to form selective groups, and the parts of corresponding selective groups are assembled interchangeably. After the invention of advanced dimension measuring devices and the computer, today batch selective assembly plays a vital role in the manufacturing system. In batch selective assembly, all dimensions of a batch of mating parts are measured and stored in a computer. Instead of forming selective groups, each and every part is assigned to its best matching part. In this work, a particle swarm optimisation based algorithm is proposed by applying the batch selective assembly methodology to a multi-characteristic assembly environment, to maximise the assembly efficiency and thereby maximising the manufacturing system efficiency. The proposed algorithm is tested with a set of experimental problem data sets and is found to outperform the traditional selective assembly and sequential assembly methods, in producing solutions with higher manufacturing system efficiency. 相似文献
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基于机器视觉的微小型零件精密装配 总被引:2,自引:1,他引:1
基于机器视觉的精密装配是实现微小型零件自动组装的重要方法.所研制的基于机器视觉的自动装配系统解决了某小型产品装配中的关键问题,其中包括待装配的零件尺寸相差大、形状和特征多样、表面质量差别较大、需要同时保证组装的位置精度和形位公差等.采用Canny边缘提取、圆的最小二乘拟合、轮廓提取、质心主轴计算、图像拼接等方法实现了待装配零件的识别定位,通过设备坐标系统的转换保证了小型零件的精确装配.实验结果表明装配精度小于40μm. 相似文献
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A New Method in Selective Assembly to Minimize Clearance Variation for a Radial Assembly Using Genetic Algorithm 总被引:3,自引:0,他引:3
Selective assembly is the method of obtaining high-precision assemblies from relatively low-precision components. A relatively smaller clearance variation is achieved than in interchangeable assembly, with the components manufactured with wider tolerance. In selective assembly, the mating parts are partitioned to form selective groups with smaller tolerance, and the corresponding groups are assembled interchangeably. The mating parts are manufactured in different machines, using different processes, and with different standard deviations. Therefore, the dimensional distributions of the mating parts are not similar. In selective assembly, the number of parts in the corresponding selective groups is not similar and will result in surplus parts. The clearance variation is also very high. In this article, a new method is proposed in selective assembly. Instead of assembling components from corresponding selective groups, the components from different combination of selective groups can be assembled to achieve minimum clearance variation. Genetic algorithm is used to find the best combination of the selective groups for minimizing the clearance variation. A case of hole and shaft (radial) assembly is analyzed in this article, and the best combination is obtained to minimize assembly clearance variation. The assembly is done in three stages to completely use all the components. The best combination for the selective groups and the resulting clearance variations are tabulated. The surplus parts are minimized to a large extent. 相似文献
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基于VRML场景的虚拟装配环境设计 总被引:1,自引:0,他引:1
Java 和VRML 的结合,构成了创建基于网络的大规模虚拟环境的理想综合平台,特别适合分布式VRML 场景的虚拟装配环境设计。给出了一种基于VRML 和Java的虚拟现实构建方法,即通过I-DEAS 完成虚拟产品的物理建模和装配设计,修改由I-DEAS的输出的VRML 文件,增加交互性所必需的传感器节点,然后利用VRML 的Script 和EAI将它们有机地集成在一起,在此技术上完成VRML 场景的动态生成、装配控制及装配过程的动画回放等功能。 相似文献
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Tools and equipment (T&E) play an important role in the simulation of virtual assembly, especially in the assembly process simulation and plan. The interactive operation simulation of T&E is also a challenge for interactive assembly operation because of variety in function and complexity in structure and manipulation. Based on detailed analysis of interactive operations, the functional requirement for T&E is given. Then, a unified modelling method for information expression and function realisation of general T&E is represented, and the handling methods of some typical manual, semi-automatic, automatic T&E are discussed. Finally, the rear suspension and the front suspension assembly workplace operation simulation in the RA-750 car assembly line are introduced. The result shows that the modelling and handling methods are applicable in the interactive simulation of various T&E. 相似文献
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