The conventional total knee arthroplasty （TKA） is the most successful surgical procedure for relieving pain and improving poor function in patients with advanced arthritis. However, postoperative pain and delayed re...The conventional total knee arthroplasty （TKA） is the most successful surgical procedure for relieving pain and improving poor function in patients with advanced arthritis. However, postoperative pain and delayed rehabilitation are the greatest complaints for the conventional approach. Recently, various minimally invasive surgery （MIS） TKA-techniques have been developed to address the concern. MIS-TKAs have shown less postoperative pain, shorter hospital stays, and quicker recovery after surgery.展开更多
Operations in assembling and joining large size aircraft components are changed to novel digital and flexible ways by digital measurement assisted alignment.Positions and orientations（P＆O）of aligned components are ...Operations in assembling and joining large size aircraft components are changed to novel digital and flexible ways by digital measurement assisted alignment.Positions and orientations（P＆O）of aligned components are critical characters which assure geometrical positions and relationships of those components.Therefore,evaluating the P＆O of a component is considered necessary and critical for ensuring accuracy in aircraft assembly.Uncertainty of position and orientation（U-P＆O）,as a part of the evaluating result of P＆O,needs to be given for ensuring the integrity and credibility of the result;furthermore,U-P＆O is necessary for error tracing and quality evaluating of measurement assisted aircraft assembly.However,current research mainly focuses on the process integration of measurement with assembly,and usually ignores the uncertainty of measured result and its influence on quality evaluation.This paper focuses on the expression,analysis,and application of U-P＆O in measurement assisted alignment.The geometrical and algebraical connotations of U-P＆O are presented.Then,an analytical algorithm for evaluating the multi-dimensional U-P＆O is given,and the effect factors and characteristics of U-P＆O are discussed.Finally,U-P＆O is used to evaluate alignment in aircraft assembly for quality evaluating and improving.Cases are introduced with the methodology.展开更多
基金This study was supported by grants from the Sino-Germany Cooperation Project of the Ministry of Science and Technology of China，the Beijing Science and Technology Planning Projects of Beijing Science and Technology Committee，the Instrument Research Project of the National Natural Science Foundation
文摘The conventional total knee arthroplasty （TKA） is the most successful surgical procedure for relieving pain and improving poor function in patients with advanced arthritis. However, postoperative pain and delayed rehabilitation are the greatest complaints for the conventional approach. Recently, various minimally invasive surgery （MIS） TKA-techniques have been developed to address the concern. MIS-TKAs have shown less postoperative pain, shorter hospital stays, and quicker recovery after surgery.
基金support of National Natural Science Foundation of China (No.50905010)Fund of National Engineering and Research Center for Commercial Aircraft Manufacturing (No.SAMC12-JS-15-044)
文摘Operations in assembling and joining large size aircraft components are changed to novel digital and flexible ways by digital measurement assisted alignment.Positions and orientations（P＆O）of aligned components are critical characters which assure geometrical positions and relationships of those components.Therefore,evaluating the P＆O of a component is considered necessary and critical for ensuring accuracy in aircraft assembly.Uncertainty of position and orientation（U-P＆O）,as a part of the evaluating result of P＆O,needs to be given for ensuring the integrity and credibility of the result;furthermore,U-P＆O is necessary for error tracing and quality evaluating of measurement assisted aircraft assembly.However,current research mainly focuses on the process integration of measurement with assembly,and usually ignores the uncertainty of measured result and its influence on quality evaluation.This paper focuses on the expression,analysis,and application of U-P＆O in measurement assisted alignment.The geometrical and algebraical connotations of U-P＆O are presented.Then,an analytical algorithm for evaluating the multi-dimensional U-P＆O is given,and the effect factors and characteristics of U-P＆O are discussed.Finally,U-P＆O is used to evaluate alignment in aircraft assembly for quality evaluating and improving.Cases are introduced with the methodology.
