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工程科学与技术:2016,48(3):182-189
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末端约束相邻固定点间线束长度建模研究
(南京航空航天大学)
Length modeling of the end cable harnesses between mechanical fixed points and electrical fixed points
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投稿时间:2015-09-23    修订日期:2016-04-15
中文摘要: 将装配状态下飞机线束分支分解为若干相邻固定点间线束,并将一端是机械类固定点、另一端是电气类固定点的相邻固定点间线束定义为“末端约束相邻固定点间线束(简称末端线束)”;系统揭示了飞机样机装配中线束分支长度的确定原理,提出原型机上确定分支长度的单元是相邻固定点间线束长度,人工确定相邻固定点间线束长度的思维过程可以抽象为预定长度下满足工艺几何要求和工艺间隙要求两个判据的迭代过程;基于该线束分支长度确定原理,建立了可用于计算机平台计算的末端线束最大、最小长度模型。为求解长度模型,采用6R机器人手臂建立了末端线束初步几何模型,并通过6根杆件长度的比例变化模拟线束的刚度特性;基于曲线能量最小原理,将初步几何模型中主体部分中心线精细化为端点不变、等长的圆弧,进而建立了末端线束精细几何模型,提高了间隙检测精度。最后,基于虚拟现实平台对末端线束长度模型进行了编程实现,并进行了实验验证。
Abstract:The cable harness branches assembled in aircrafts can be separated by fix points into a number of cable harnesses between the adjacent fix points. One kind of these cable harnesses between the adjacent fix points, which has the assembly feature: one fix point being a mechanical protection and the other fix point being electrical connector, is defined as the end cable harness between the adjacent fix points(''the end cable harness'' for short) in this paper. The principle of determining the lengths of cable harness branches in prototype was revealed, it is proposed that the unit lengths of determining cable harness branches in prototype are lengths of cable harnesses between the adjacent fix points. And the process for assembly workers to determine the length of one cable harness between the adjacent fix points was abstracted as a kind of iterative approach in which its length was determined by justifying whether the process geometrical requirement and the process clearance requirement could be met or not under a given possible lengths. On the basis of that, the length model of the end cable harness was developed to calculate its maximum and minimum length values in the computer platform. To solve the model, the preliminary geometry model for this kind of cable harness was proposed by 6R robot arms, in which the end cable harness’s stiffness could be simulated by adjusting the ratio of lengths of the six rods. Then based on the minimum curve energy method, the refined geometric model was proposed where the center line of the main body of the preliminary geometry was refined to an arc with common end points and same length, the gap detecting precision was improved. Finally, the length model of the end cable harness was programmed in VR environment and the calculating result of an entire example was verified by experiments.
文章编号:201501006     中图分类号:    文献标志码:
基金项目:国家商用飞机制造工程技术研究中心创新基金资助“飞机线束虚拟装配仿真技术研究”
Author NameAffiliationE-mail
Yan Jing  yanjing@nuaa.edu.cn 
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引用文本:
闫静.末端约束相邻固定点间线束长度建模研究[J].工程科学与技术,2016,48(3):182-189.
Yan Jing.Length modeling of the end cable harnesses between mechanical fixed points and electrical fixed points[J].Advanced Engineering Sciences,2016,48(3):182-189.