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论述了所研制的一种折叠机构弹簧拉力测量系统的原理,主要分析研究了测量系统中拉力测量数据的理论模型及预处理、再处理、误差评定的方法。 相似文献
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将直线度偏差数据转换为平面度偏差数据,然后用矩阵对平面度偏差数据进行简捷处理,得出的最大元素值与最小元素值之差即为平面度误差,既符合JJG117-78《平板检定规程》,又易于手工计算和计算机处理。 相似文献
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集成式6自由度微动并联机器人系统 总被引:3,自引:2,他引:3
基于机构、驱动、检测一体化的思想,研制出了压电陶瓷驱动的6自由度集成式并联微动机器人,对该机器人的机构、驱动、检测、控制及误差补偿方法进行了研究.采用6自由度(6-SPS)并联结构设计了微动并联机器人的构型,对结构参数进行了优化,并进行了运动空间分析和刚度分析.基于模块化设计思想将压电陶瓷驱动电源、微位移传感器检测电路、中央控制器组合在一起,通过自定义的内部总线相连构成了并联机器人的驱动和控制系统.最后,给出了该机器人位姿测量方法,并分别在压电陶瓷的开环与闭环控制状态下进行位姿测量,进而实现误差补偿.实验结果表明:该并联微动机器人可实现10 nm平动重复定位精度;0.0001°转动重复定位精度;具有定位精度和可靠性高,使用灵活方便的特点,满足多自由度精密定位的要求. 相似文献
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本文针对模具数控加工的特点,提出了选用加工中心时应考虑的若干方面,以保证加工质量和提高生产效率。 相似文献
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Parallel manipulators have the potentials of high efficiency and high precision in the field of machining and manufacturing. However, accuracy improvement of the parallel manipulator is still an essential and challenging issue, encountering two important problems. Firstly, the ignorance of elastic deformation caused by gravity or deviations of static stiffness model restricts further improvement of accuracy. To solve this problem, an elasto-geometrical error modeling method is proposed. The comprehensive effects of structural errors, elastic deformation under gravity and compliance parameter errors on pose deviations are disclosed. On this basis, the identification equation of actual structural errors and compliance parameter errors can be established. Secondly, the ill-conditioned identification matrix and the identification equation with anisotropic residual error can lead to inaccurate identification results. To solve this problem, a weighted regularization method is proposed. The identification equation with isotropic residual error is built, and accurate identification can be realized with the regularization method. Based on the proposed methods, the error compensation experiment is conducted on the prototype of a five-axis parallel machining robot using a laser tracker. Experiment results show that the accuracy of the machining robot is significantly improved after compensation. An M1_160 test piece and an S-shaped test piece are machined and measured to further validate the effectiveness of the proposed methods. The elasto-geometrical error modeling method and the weighted regularization method can be applied to other parallel manipulators’ accuracy improvement. 相似文献
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介绍了数据中心在遇到突发情况时,为确保信息系统在短时间内安全、高效地完成停机操作,如何通过制定应急关机计划,以此避免由于次生灾害对数据中心带来的进一步损失,为系统的运行安全和数据的存储安全提供技术保证. 相似文献