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; local deformation; forming accuracy 渐进成形是近年来为适应市场需求多样化而重新发展起来的一种柔性快速先进制造技术[1-2].采用单点渐进成形(single point incremental forming,SPIF)[3],无需模具,通过控制成形头的运动轨迹即可加工变形程度大,形状复杂的零件.Jackson等[4]通过实验研究了铜板的单点渐进变形机理......
微硅粉颗粒累积厚度如图9所示.从图9可见:1 500 h后1号传感器在试验,芯片表面颗粒累积厚度达到16.662 μm,2号传感器为24.139 μm.观察芯片表面的形貌可以发现:污染物颗粒主要围绕中心区域(热膜电阻布置区域)周边累积,呈"U"型分布,热膜电阻上方基本无颗粒累积. 图8 不同时间试验传感器测量精度变化曲线 Fig. 8 Accuracy changes of test... in Engineering, 2019, 2019: 1-15. [14] SHEN Yongxi, SUN Zhongsheng, YUAN Changrong, et al. Simulation about contamination influence of calorimetrie flow sensor on measurement accuracy[C]// 2017 IEEE......
J. Cent. South Univ. (2017) 24: 1696-1702 DOI: 10.1007/s11771-017-3576-8 Evaluating accuracy of Hessian-based predictor-corrector integrators LU Shao-fei(陆绍飞)1, WU Heng(伍恒)2, Eduardo Colmenares3... of moving atoms in direct dynamics simulations. We employ a monodromy matrix to propose a tool for evaluating the accuracy of integrators in the trajectory calculation. We choose a general velocity......
水平巷道贯通控制测量误差预计及精度分析张路平1(1.黑龙江省伊春市黑龙江乌拉嘎黄金矿业有限责任公司)摘 要:贯通工程的质量直接影响矿山的安全生产,提高贯通测量精度是确保贯通工程质量的关键.详细介绍了黑龙江乌拉嘎金矿西露天采场70中段巷道硐口点到竖井70中段外延巷道600 m贯通测量方法,并对贯通测量进行了误差预计和精度分析;提出了贯通测量施测中应注意的问题,值得借鉴.关键词:井下工程; 贯通测量; 误差预计; 贯通精度......
coupling error; nonlinear PD control; synchronization control; trajectory tracking accuracy Cite this article as: LIU Yan-jie, LIANG Le, CHU Ting-ting, WU Ming-yue. N-PD cross-coupling synchronization..., are widely used in industrial areas, such as arc welding, assembly and cutting fields with high contour tracking accuracy and high repeatability demands. Since these kinds of lightweight robots are multi......
, China) Abstract: To mitigate the affection of the inaccurate distance measurement on the accuracy of the localization system in coal mines, an improved distance estimation method assisted by mobile... on their relative motion and geometrical restriction, and combined static and mobile target scenarios into a unified framework. The simulations show that the distance measurement accuracy of MBDisEst......
University, Changsha 410083, China; 2. Digital Mine Research Center, Central South University, Changsha 410083, China) Abstract: In order to improve the accuracy of the mine personnel localization... index; signal transmission model; improved genetic algorithm; positioning accuracy 由于矿产资源需求量的增加以及浅部资源的不断消耗,国内外大多数矿山逐渐进入深部开采状态,从而导致矿山企业面临的安全问题变得更加突出.岩爆,透水以及瓦斯等事故高频率的发生使得矿山企业不仅需要对开采环境做到及时预测,同时需在事故发生后能对受......
J. Cent. South Univ. (2016) 23: 2941-2950 DOI: 10.1007/s11771-016-3358-8