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并联坐标测量机建模理论及其虚拟原型设计 总被引:2,自引:1,他引:1
并联运动机构具有结构刚性大、运动速度高、误差不叠加等独特特性,因而若将其应用于坐标测量机中,将有可能使坐标测量机的测量精度及测量效率等综合性能得到很大程度的改善。本文首先介绍了一种基于并联运动机构的新型坐标测量机的结构、特点及工作原理,然后建立了该坐标测量机的测量模型,最后,在Windows 98(Windows NT)开发环境下,通过VC++6.0调用OpenGL图形库中的图形函数,对该坐标测量机的虚拟原型进行了参数化三维建模与仿真,从而为真实样机的制作奠定了基础。 相似文献
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并联机构的运动学分析即是求解并联机构的输入与输出构件的位移、速度、加速度之间的关系。文章以基于Stewart平台的六自由度并联机构坐标测量机为研究对象,在ADAMS软件环境下建立了六自由度并联坐标测量机的虚拟样机模型,然后基于虚拟样机对所研究的并联坐标测量机进行了运动学仿真。通过软件仿真,可以对并联坐标测量机各种运动性能产生直观的了解,从而为并联坐标测量机的设计与开发提供软件验证方法,为建立物理样机打下坚实的基础。同时利用虚拟样机技术还可以大大简化并联坐标测量机的运动学逆解和正解,为进一步对并联坐标测量机的系统优化创造了有利条件。 相似文献
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坐标测量机非刚体误差补偿模型中附加函数的研究 总被引:1,自引:0,他引:1
通过对一台悬臂式坐标测量机的研究,建立了非刚体的误差补偿模型。详细深讨了模型中附加函数的理论分析和在实际应用中获得它的方法。通过实验验证,非刚体补偿模型对提高弱刚度坐标测量机的精度行之有效。 相似文献
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针对柔性加工线仿真软件鲜有兼具实时数据驱动的设备动作仿真与切削轨迹可视化仿真问题,研究了自动加工线可视化仿真建模要素,提出了基于数据-机构-逻辑的虚拟样机仿真框架与柔性加工线仿真中数据建模方法,通过仿真运动副实现虚拟设备的动作仿真,通过虚拟刀具路径3D可视化模块实现加工线中数控机床刀具切削过程的轨迹可视化仿真,研究了用于虚拟设备逻辑控制的QCode指令系统,设计并开发了面向柔性加工线仿真的虚拟样机原型平台软件,在汽车零部件加工线实例中进行了应用验证,仿真应用表明该虚拟样机软件在兼顾加工线设备动作仿真和刀具轨迹可视化仿真的有效性。 相似文献
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首先对6-DOF并联机构坐标测量机的组成结构及工作原理进行了介绍,然后针对该坐标测量机的运动特点,提出了一种基于逐次逼近算法的结构参数识别与修正方法.该方法以最小二乘逐次逼近算法为基础,以寻找6自由度并联机构坐标测量机的43个主要结构参数为目的.文中对所提算法的求解过程进行了详细的论述,并通过计算机仿真计算,对结构参数的识别与修正结果进行了验证.仿真结果表明,所提出的逐次逼近算法能够充分利用目标函数值的信息,优化搜索过程具有较强的方向性和目标性,且收敛速度较快.采用该方法对6自由度并联机构坐标测量机的结构参数进行识别与修正以后,可使该坐标测量机的测量精度得到明显改善. 相似文献
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以电子仪表类产品为具体应用对象,对虚拟原型逼真设计产品开发方法进行了介绍,建立了仪表产品虚拟原型逼真设计软件框架模型。在此基础上提出了虚拟环境下生命周期产品设计方案模糊多目标决策方法和数学模型。 相似文献
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Ming C. Leu Hoda A. ElMaraghy Andrew Y.C. Nee Soh Khim Ong Michele Lanzetta Matthias Putz Wenjuan Zhu Alain Bernard 《CIRP Annals》2013,62(2):799-822
This paper reviews the state-of-the-art methodologies for developing computer-aided design (CAD) model based systems for assembly simulation, planning and training. Methods for CAD model generation from digital data acquisition, motion capture, assembly modeling, human–computer interface, and data exchange between a CAD system and a VR/AR system are described. Also presented is an integrated methodology for designing, planning, evaluating and testing assembly systems. The paper further describes the implementation of these methods and provides application examples of CAD model based simulation for virtual assembly prototyping, planning and training. Finally, the technology gaps and future research and development needs are discussed. 相似文献
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提出了基于虚拟技术的楔横轧塑性成形技术的总体思想,旨在简化长期以来困扰人们的楔横轧塑性成形设计与试验。针对楔横轧成形过程的特点,将虚拟样机、神经网络、CAD、有限元数值模拟、参数化和最优化等技术应用于虚拟设计与试验,能实现楔横轧虚拟试验的预期效果,并实现了设备分析、模具设计、零件加工、强度分析等一体化。 相似文献
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On-line error compensation of coordinate measuring machines 总被引:1,自引:0,他引:1
An on-line error compensation system for coordinate measuring machines (CMMs) is described, which is based on three laser optical Multi-Degree-of-Freedom Measurement Systems (MDFM systems), each for one axis of CMMs. Twelve of the twenty-one error components associated with a CMM are measured on-line by these MDFM systems. The remaining error components are measured by off-line methods which use commercially available measurement systems, such as a laser interferometer. Two mathematical error models have been developed to synthesize the error components and to predict the errors at the probe stylus tip. One model corresponds to the conventional off-line error compensation and the other to the on-line error compensation. The errors predicted by these models are then subtracted from the nominal coordinates of the CMM, thus improving its measurement accuracy. Diagonal tests using a laser interferometer system were designed to check the error compensation effect. Test results showed that the use of the on-line compensation system can further improve the compensation effect as compared with the conventional off-line compensation system. 相似文献
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虚拟样机概念及体系结构研究 总被引:8,自引:0,他引:8
作为90年代才逐渐发展起来的以CAX/DFX为代表的先进系统建模仿真设计方法,虚拟样机(VP)技术已成为虚拟制造(VM)的关键使能技术。本文主要通过对其概念和体系结构发展的分析,结合当今CIMS技术和研究的进展,最终提出了基于集成产品和过程开发(IPPD)方法论、面向多领域复杂产品的新一代VP的概念和体系结构。 相似文献
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在分析传统机械设计方法中所存在的问题的基础上,论述了虚拟样机技术的概念、主要特点及其用于300 MN模锻水压机接力器设计的优点.阐述了模锻水压机接力器的结构和工作原理.详细介绍了基于SolidWorks软件的接力器虚拟样机的开发过程,其中包括接力器虚拟样机的三维建模、虚拟装配、干涉检查、运动仿真、关键部件强度校核和二维工程图的输出等.结果表明, 虚拟样机技术在接力器设计中的应用可以大大缩短其研制周期,节省开发费用. 相似文献
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基于虚拟原型的水冷离心铸管管模热特性分析建模 总被引:1,自引:0,他引:1
利用虚拟原型仿真对管模的热特性进行了系统分析 ,全面地了解了管模的受热、受力状态。根据管模的工况 ,研究了基于虚拟原型仿真的热特性建模。 相似文献
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Error calibration and frequent reverification of coordinate measuring machines (CMMs) and machine tools are currently acknowledged as essential processes in order to maintain high performance of the machines and high quality of products. This paper shows a micro-computer integrated error calibration system, which is a fast and efficient error calibration system: a micro-computer stores calibration data of mechanical artefacts, such as ring and step gauges that have been calibrated with respect to more precise equipment, then the machine probes the gauges. The gauge probing data are compared with the gauge calibration data. The micro-computer plans measurement paths thus generating CNC codes for measurement of the mechanical artefacts located in a working volume of a commercial CMM. Then measurement operations are performed according to the planned paths for practical measurement of the gauges. For ring gauge measurement, the lobing error of the probe stylus has been efficiently measured then used for the probe compensation. The circular errors are successfully calculated from the comparison between the ring gauge geometry and the ring gauge probing data after the probe stylus compensation in terms of software. Then from the error pattern of circular error, machine errors such as scale errors and orthogonality error are successfully calculated, showing good approximation to the evaluated circular error. In the case of the step gauge measurement, the gauge probing data are compared with those of calibration data; thus complete linear displacement error analysis is successfully evaluated along any direction in a working volume. The error evaluations are then processes in real time, and presented in computer graphic environments. Practical application to a commercial CMM of CNC-type shows the validity and efficiency of the developed system. Thus a rigorous computer integrated error calibration system is proposed with the full potential of practical application to most commercial CMMs and machine tools of a CNC-type. 相似文献
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应用传统九线法进行精密数控机床误差补偿存在三点不足:首先,因激光测量与机床制造所采用的坐标系不一,在滚转角误差补偿过程中存在着原理性误差;其次,因九线法测量时纳入了测量噪声,将机床重复定位精度等也涵盖在内,导致辨识算法鲁棒性差;第三,九线法所得辨识结果只能用于误差补偿,而不能用于前期机床精度设计与机床装配与调试过程中精度的控制与工艺优化,原因在于该模型在设计时忽略了机床结构参数。以上3点限制了传统九线法的应用领域及测量结果的公信度。通过误差补偿模型重构、计算机仿真分析、实证对比研究、误差修正参数计算、实测结果校核等步骤,证明了建立的模型能修正传统九线法模型的3点不足,提高了九线法滚转角误差的辨识精度。 相似文献