Form error measurement is a critical exercise in providing measures for the quality control in the precision manufacturing industry.Coordinate measuring machine （CMM） is one of the automated systems used in the accu...Form error measurement is a critical exercise in providing measures for the quality control in the precision manufacturing industry.Coordinate measuring machine （CMM） is one of the automated systems used in the accurate and precise dimensional measurements and geometrical form.This paper aims to study the effect of dynamic original unforeseeable errors at different undulations per revolution （UPR） of standard artifact measurement using selected two types of CMM touchtriggering stylus.Stylus-type and stylus-speed parameters were adopted and utilized throughout the course of experiment.The results are analyzed using fast Fourier transformation to obtain foreseeable geometrical errors due to CMM machine structure and stylus scanning speeds.The results of experiment successfully indicate that the number of UPR plays an important role in determining the CMM accuracy level of the roundness measurement result.Some specific error equations for stylus system and machine structure responses have been postulated and analysed to empirically predict the accuracy of PRISMOBridge-CMM-type at National Institute for Standards （NIS） in egypt.展开更多
整车控制器(vehicle control unit,VCU)作为无人驾驶方程式赛车的重要组成部分,直接影响赛车的稳定性、灵敏性和控制性。为满足中国大学生无人驾驶方程式大赛(Formula Student Autonomous China,FSAC)规则要求,分析了赛车状态机需求,以M...整车控制器(vehicle control unit,VCU)作为无人驾驶方程式赛车的重要组成部分,直接影响赛车的稳定性、灵敏性和控制性。为满足中国大学生无人驾驶方程式大赛(Formula Student Autonomous China,FSAC)规则要求,分析了赛车状态机需求,以MC9S12XET256单片机为主控芯片,基于控制器局域网络(controller area network,CAN)通信技术,设计了整车控制器软件系统,针对模数转换(analog to digital converter,A/D)采样技术、轮速测量技术及通信技术3个功能模块进行详细阐述,并进行实验。实验测试证明,所设计的控制器能够较好地完成无人驾驶方程式赛车的控制任务。展开更多
文摘Form error measurement is a critical exercise in providing measures for the quality control in the precision manufacturing industry.Coordinate measuring machine （CMM） is one of the automated systems used in the accurate and precise dimensional measurements and geometrical form.This paper aims to study the effect of dynamic original unforeseeable errors at different undulations per revolution （UPR） of standard artifact measurement using selected two types of CMM touchtriggering stylus.Stylus-type and stylus-speed parameters were adopted and utilized throughout the course of experiment.The results are analyzed using fast Fourier transformation to obtain foreseeable geometrical errors due to CMM machine structure and stylus scanning speeds.The results of experiment successfully indicate that the number of UPR plays an important role in determining the CMM accuracy level of the roundness measurement result.Some specific error equations for stylus system and machine structure responses have been postulated and analysed to empirically predict the accuracy of PRISMOBridge-CMM-type at National Institute for Standards （NIS） in egypt.
文摘整车控制器(vehicle control unit,VCU)作为无人驾驶方程式赛车的重要组成部分,直接影响赛车的稳定性、灵敏性和控制性。为满足中国大学生无人驾驶方程式大赛(Formula Student Autonomous China,FSAC)规则要求,分析了赛车状态机需求,以MC9S12XET256单片机为主控芯片,基于控制器局域网络(controller area network,CAN)通信技术,设计了整车控制器软件系统,针对模数转换(analog to digital converter,A/D)采样技术、轮速测量技术及通信技术3个功能模块进行详细阐述,并进行实验。实验测试证明,所设计的控制器能够较好地完成无人驾驶方程式赛车的控制任务。
