The research on the parameters optimization for gasbag polishing machine tools, mainly aims at a better kinematics performance and a design scheme. Serial structural arm is mostly employed in gasbag polishing machine ...The research on the parameters optimization for gasbag polishing machine tools, mainly aims at a better kinematics performance and a design scheme. Serial structural arm is mostly employed in gasbag polishing machine tools at present, but it is disadvantaged by its complexity, big inertia, and so on. In the multi-objective parameters optimization, it is very difficult to select good parameters to achieve excellent performance of the mechanism. In this paper, a statistics parameters optimization method based on index atlases is presented for a novel 5-DOF gasbag polishing machine tool. In the position analyses, the structure and workspace for a novel 5-DOF gasbag polishing machine tool is developed, where the gasbag polishing machine tool is advantaged by its simple structure, lower inertia and bigger workspace. In the kinematics analyses, several kinematics performance evaluation indices of the machine tool are proposed and discussed, and the global kinematics performance evaluation atlases are given. In the parameters optimization process, considering the assembly technique, a design scheme of the 5-DOF gasbag polishing machine tool is given to own better kinematics performance based on the proposed statistics parameters optimization method, and the global linear isotropic performance index is 0.5, the global rotational isotropic performance index is 0.5, the global linear velocity transmission performance index is 1.012 3 m/s in the case of unit input matrix, the global rotational velocity transmission performance index is 0.102 7 rad/s in the case of unit input matrix, and the workspace volume is 1. The proposed research provides the basis for applications of the novel 5-DOF gasbag polishing machine tool, which can be applied to the modern industrial fields requiring machines with lower inertia, better kinematics transmission performance and better technological efficiency.展开更多
目的对心力衰竭患者安宁疗护准入评估相关文献进行综述,明确国内外心力衰竭患者安宁疗护准入评估指标及对应的评估标准或评估工具。方法以范围综述方法为框架,计算机检索PubMed、Web of Science、Cochrane Library、Embase、中国知网、...目的对心力衰竭患者安宁疗护准入评估相关文献进行综述,明确国内外心力衰竭患者安宁疗护准入评估指标及对应的评估标准或评估工具。方法以范围综述方法为框架,计算机检索PubMed、Web of Science、Cochrane Library、Embase、中国知网、万方数据库、中国生物医学文献数据库和维普网,检索时限均为建库至2022年4月30日。纳入心力衰竭患者安宁疗护准入评估相关的原始研究及综述,由2名研究者独立筛选和提取资料。结果最终纳入文献15篇。文献整合结果显示,心力衰竭患者安宁疗护准入评估指标包括疾病进展、患者需求、医疗资源利用及医疗机构情况4个类别,包含患者预计生存期、心脏功能、高危生物标志物、运动状态、并发症与合并症、晚期治疗、患者主观意愿、复杂症状缓解需求、社会支持需求、多次非计划入院、住院时间延长和医疗机构软硬件资源12个评估指标及对应的评估标准或评估工具。结论心力衰竭患者安宁疗护准入评估指标内容全面,但部分指标评估标准不明确,整体缺乏共识。未来研究者可在现有研究的基础上遴选敏感性较好的评价指标,构建心力衰竭患者安宁疗护准入评估标准,并在临床实践中加以验证,以促进安宁疗护在心力衰竭患者的疾病管理中的应用。展开更多
基金supported by National Natural Science Foundation of China (Grant No. 51005207)Open Foundation of the Mechanical Engineering in Zhejiang University of Technology, China (Grant No.2009EP004)Foundation of Zhejiang Provincial Education Department of China (Grant No. Y200908129)
文摘The research on the parameters optimization for gasbag polishing machine tools, mainly aims at a better kinematics performance and a design scheme. Serial structural arm is mostly employed in gasbag polishing machine tools at present, but it is disadvantaged by its complexity, big inertia, and so on. In the multi-objective parameters optimization, it is very difficult to select good parameters to achieve excellent performance of the mechanism. In this paper, a statistics parameters optimization method based on index atlases is presented for a novel 5-DOF gasbag polishing machine tool. In the position analyses, the structure and workspace for a novel 5-DOF gasbag polishing machine tool is developed, where the gasbag polishing machine tool is advantaged by its simple structure, lower inertia and bigger workspace. In the kinematics analyses, several kinematics performance evaluation indices of the machine tool are proposed and discussed, and the global kinematics performance evaluation atlases are given. In the parameters optimization process, considering the assembly technique, a design scheme of the 5-DOF gasbag polishing machine tool is given to own better kinematics performance based on the proposed statistics parameters optimization method, and the global linear isotropic performance index is 0.5, the global rotational isotropic performance index is 0.5, the global linear velocity transmission performance index is 1.012 3 m/s in the case of unit input matrix, the global rotational velocity transmission performance index is 0.102 7 rad/s in the case of unit input matrix, and the workspace volume is 1. The proposed research provides the basis for applications of the novel 5-DOF gasbag polishing machine tool, which can be applied to the modern industrial fields requiring machines with lower inertia, better kinematics transmission performance and better technological efficiency.
文摘目的对心力衰竭患者安宁疗护准入评估相关文献进行综述,明确国内外心力衰竭患者安宁疗护准入评估指标及对应的评估标准或评估工具。方法以范围综述方法为框架,计算机检索PubMed、Web of Science、Cochrane Library、Embase、中国知网、万方数据库、中国生物医学文献数据库和维普网,检索时限均为建库至2022年4月30日。纳入心力衰竭患者安宁疗护准入评估相关的原始研究及综述,由2名研究者独立筛选和提取资料。结果最终纳入文献15篇。文献整合结果显示,心力衰竭患者安宁疗护准入评估指标包括疾病进展、患者需求、医疗资源利用及医疗机构情况4个类别,包含患者预计生存期、心脏功能、高危生物标志物、运动状态、并发症与合并症、晚期治疗、患者主观意愿、复杂症状缓解需求、社会支持需求、多次非计划入院、住院时间延长和医疗机构软硬件资源12个评估指标及对应的评估标准或评估工具。结论心力衰竭患者安宁疗护准入评估指标内容全面,但部分指标评估标准不明确,整体缺乏共识。未来研究者可在现有研究的基础上遴选敏感性较好的评价指标,构建心力衰竭患者安宁疗护准入评估标准,并在临床实践中加以验证,以促进安宁疗护在心力衰竭患者的疾病管理中的应用。
