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1.
针对存在大量刚体运动的虚拟场景,提出一种基于在GPU上实现的实时仿真算法,利用GPU的并行计算能力,实时处理刚体交互,更新刚体状态.使用深度剥离技术,离散化刚体,并使其由一组具有相同大小的粒子表示.每一帧刚体间的运动交互则由粒子间的运动交互来实现.碰撞粒子对间的交互则用离散元法.通过统一网格方式,分割仿真域空间,以提高碰撞检测速率.实验证明,提出的新算法大幅度的提升了仿真大量刚体的速率.  相似文献   

2.
基于多刚体动力学的原理,在分析机械臂的运动学和拉格朗日动力学方程的基础上求解其雅可比矩阵,并采用虚拟样机技术建立了机械臂的三维仿真模型,进行了动力学分析,获得了机械臂的动态特性。通过将获得的动态特性还原到模型中,建立了基于可视化技术的机械臂运动姿态的计算机动画,逼真地模拟了机械臂的整个运动过程,检验了机械臂动力学模型的相关性能。  相似文献   

3.
六自由度机械臂轨迹规划与仿真研究   总被引:4,自引:0,他引:4  
针对六自由度链式机械臂在进行正运动学、逆运动学以及轨迹规划仿真时,不易直观地验证运动学算法的正确性和轨迹规划的效果,在正确建立机械臂数学模型的基础上,重点分析了机械臂在关节空间中轨迹规划的两种实现方法,并采用三维运动仿真进行了验证.开发了一套六自由度机械臂三维仿真软件,该仿真软件在VC++6.0开发平台上,首先利用分割类将基于MFC框架的窗口分割成为控制窗口和视图窗口两部分,然后利用OpenGL的图形库对机械臂进行建模,首次将正运动学、逆运动学以及轨迹规划算法融入其中开发而成.该仿真软件有效地验证了机械臂运动学模型建立的正确性,同时也对三次多项式和五次多项式两种轨迹规划方法做了直观的比较,结果表明后一种轨迹规划效果明显优于前一种.  相似文献   

4.
以装载机工作装置主要受力件之一的连杆作为研究对象,结合多刚体动力学和柔性体动力学理论,建立连杆的刚-柔耦合运动学、动力学数学模型.并在ANSYS软件中生成它的有限元模态中性文件,将其导入到ADAMS软件中建立的装载机工作装置虚拟样机上,进行相应的运动学、动力学仿真分析.研究工作装置中连杆柔性体对工作装置性能的影响,揭示了工作装置中柔性体与刚性体耦合时的运动学、动力学特性,为复杂机械系统运动学、动力学特性的研究提供了可供借鉴的思路.  相似文献   

5.
柴油发动机动力学分析   总被引:2,自引:0,他引:2  
为获得发动机运行时关键部件的运行情况,以多刚体系统动力学理论与虚拟样机试验技术为基础,用Pro/E三维建模软件建立某柴油发动机的几何模型,并通过动力学仿真软件MSC Adams对该发动机进行动力学仿真,获得曲柄连杆机构、进排气机构等部件的关键运动学、动力学参数,该仿真为进一步分析和设计柴油发动机奠定基础.  相似文献   

6.
基于OpenGL的六自由度机械臂三维仿真工具的设计   总被引:1,自引:1,他引:0  
针对六自由度链式机械臂,为了解决运动学分析结果不易验证以及在实际本体上试验成本较高的问题,开发了一套六自由度机械臂三维仿真软件;该仿真软件是在VC++6.0开发平台上.基于MFC框架类和OpcnGL的图形库进行开发的;仿真软件有效地验证了机械臂数学模型以及正、逆运动学求解工程的正确性,并且对4种轨迹规划方式的效果做了直观的比较;结果表明开发出来的仿真软件对机械臂的研究与教学起了相应的作用.  相似文献   

7.
协同虚拟现实技术具有广泛的应用背景,文中以全方位轮椅为应用对象,探讨虚拟现实技术的应用.结合Mecanum轮、连续切换轮、锥滚轮这三种全向轮的运动原理与排布方式,分析了轮椅的运动学关系.在轮椅三维Pro/E模型的基础上,利用虚拟现实建模语言(VRML)对全方位轮椅进行实时定制和仿真,通过操作定制控制台可以实现零件颜色的改变和轮椅部件的替换.运动仿真控制台可以实现轮椅的直走、横走、斜走以及原地打转等运动方式的仿真.这样用户能参与到轮椅的定制设计中,得到符合自己要求的轮椅,同时对全方位轮椅的特殊运动功能有了更加深刻和形象的认识.  相似文献   

8.
颗粒离散元法是一种广泛应用于研究颗粒物料力学行为的数值模拟方法,而计算效率是制约其发展和应用的主要因素之一。通过Pro/E软件建立了料斗模型,利用Stream DEM软件对料斗的颗粒充填过程进行离散元法模拟研究,并对基于CPU和GPU加速算法的运算过程和结果进行对比。结果表明,基于GPU的计算机图形学加速算法可大幅提高颗粒离散元法模拟过程的运算效率。当填充颗粒数量达到13万时,其运算效率比基于CPU的运算效率提高了10倍以上。  相似文献   

9.
该文将计算机科学与理论力学相结合,以刚性球体为例介绍了多刚体物理运动仿真的步骤和方法。首先论述了单个及多个刚体的运动仿真步骤以及应用叠加原理计算合力及合力矩的方法。然后,针对刚体运动中的不同碰撞响应类型:碰撞接触与临时接触,提出分别建立不同的碰撞响应力学模型,前者采用动量及动量矩定理建立响应模型,后者通过分析刚体的受力和运动状态建立相应的动力学模型。最后,详细讨论了刚性球体的碰撞仿真,包括它的碰撞测定、碰撞响应模型的建立及求解等,实现了三维空间中刚性球体实时、精确、快速的运动仿真,为以后多刚体大规模仿真奠定基础。  相似文献   

10.
针对现有液压支架正向运动学分析方法无法精确感知顶梁姿态的问题,提出了一种液压支架逆向运动学分析方法。采用SolidWorks软件及其Motion模块建立液压支架三维模型和Motion模型,通过解析液压支架动作来获取Motion数据库,采用三次多项式曲线拟合液压支架各驱动部件运动方程;采用粒子群优化算法优化驱动部件运动方程,得出最优拟合方程,从而得出液压支架最优运动轨迹。试验结果表明,该方法能够准确得出液压支架各驱动部件的运动轨迹,所得结果与实际运动曲线相符。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

19.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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