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A PC-based system integrating CMM and CAD for automated inspection and reverse engineering 总被引:1,自引:0,他引:1
V. K. Gupta Dr R. Sagar 《The International Journal of Advanced Manufacturing Technology》1993,8(5):305-310
A personal computer (PC)-based system integrating a manual CMM and a CAD system has been developed for on-line capture of 3D point data, resulting in the automation of the inspection process. The sequence of steps taken to measure a master component using the CMM is stored in a measurement program in teach mode and replayed for repetitive measurement of a batch of identical components in the replay mode. The measurement program guides the CMM operator regarding the geometric entity to be measured, the number of points to be input and the direction to be followed for taking the points on the CMM. The operator has simply to follow the sequence displayed on the computer screen. The program automatically computes the dimensions and the deviations from the corresponding dimensions of the master component. The 3D measurement data from the CMM are transferred to a CAD system in real time. Programs have been developed to create 3D cubic splines and surfaces from the 3D point data taken on the CMM. The full features of the CAD software can be used to manipulate the 3D point data for CAD applications. 相似文献
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针对发电商在电力市场中的自调度计划问题,对模型中节点边际电价的不确定性进行了研究。提出了基于矩不确定分布鲁棒优化方法(DRO-MU),用于解决含不确定节点边际电价的发电自调度问题。建立了以收益最大为目标的发电自调度模型,构建了LMPs的不确定集合,在该不确定集合下将发电自调度模型转化为DRO-MU模型,再通过拉格朗日对偶原理将模型转化为一个确定性的半正定规划进行了求解。研究结果表明,随着不确定集范围的增大,发电公司收益减少;与确定性调度计划计算结果相比,DRO-MU模型收益少,但方案安全性更高、鲁棒性更强。 相似文献
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介绍了微波低相位噪声介质振荡器的设计方法。就影响介质振荡器相位噪声的因素进行了讨论,从谐振回路有载Q值、有源器件、增益压缩量、电路模式等几个方面提出了降低相位噪声的方法,并给出了一个C波段微波低相噪振荡器的设计实例。测试结果表明:该振荡器工作频率3 900 MH z,输出功率大于10 dBm,相位噪声达到-102 dB c/H z@1 kH z;-128 dB c/H z@10 kH z。 相似文献
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This paper investigates the scheduling strategy of schedulable load in home energy management system (HEMS) under uncertain environment by proposing a distributionally robust optimization (DRO) method based on receding horizon optimization (RHO-DRO). First, the optimization model of HEMS, which contains uncertain variable outdoor temperature and hot water demand, is established and the scheduling problem is developed into a mixed integer linear programming (MILP) by using the DRO method based on the ambiguity sets of the probability distribution of uncertain variables. Combined with RHO, the MILP is solved in a rolling fashion using the latest update data related to uncertain variables. The simulation results demonstrate that the scheduling results are robust under uncertain environment while satisfying all operating constraints with little violation of user thermal comfort. Furthermore, compared with the robust optimization (RO) method, the RHO-DRO method proposed in this paper has a lower conservation and can save more electricity for users. 相似文献
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为解决飓风来临前路径不确定时输电线路随机故障等带来的难题,提出了适用于含云计算数据中心的电网韧性增强日前调度策略,并将其构建为两阶段风险规避的分布鲁棒优化问题。以飓风对输电线路的时空影响为出发点,采用蒙特卡洛模拟获得飓风路径不确定时线路的离散故障集合,并构建基于L1距离度量的分布鲁棒模糊集合。然后,在日前调度中,对机组和数据中心进行优化以平衡经济性和电网韧性,并采用追索问题量化其对日间调度的影响,形成两阶段优化问题。随后,对优化问题进行确定性转换与解耦求解。最后,以含4个数据中心的IEEE-RTS系统为测试算例,验证了所提韧性增强策略应对模糊不确定性的有效性。 相似文献
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对取样锁相频率合成器的工作原理、技术特点等进行了描述,着重分析了其低相噪、低杂散特性,讨论了环路滤波器与环路扩捕的设计对环路稳定性的贡献,最后给出了X频段取样锁相频率合成器的电技指标. 相似文献
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