基于装配约束的飞机导管几何特征建模与误差补偿

Pipe Geometric Feature Modeling and Error Compensation of Aircraft Based on Assembly Constraints

针对飞机导管实际装配过程中因装配应力大导致故障频发的问题,提出了一种基于导管装配特征的误差补偿方法。首先采用几何建模法进行了导管装配过程的几何建模,并提出了一种基于轴线矢量的导管装配模型建模方法。在此基础上,采用罗德里格旋转公式建立了基于实际装配工况下的导管空间位姿计算模型。然后基于导管装配要求进行了装配约束分析并识别了导管装配关键约束特征。随后分析了不同约束形式下的导管装配场景,并分别提出了单约束和关联约束下导管装配误差补偿方法。最后选用航空典型扩口导管进行试验研究,分别进行导管装配误差补偿计算和导管装机气密性试验,结果表明所提出的方法能够有效地实现导管理论空间位姿调节和参数补偿,且补偿后的导管在装机气密性上明显优于未补偿的导管。

An error compensation method based on assembly constraints of aircraft pipe is proposed for solving the problem of frequent failures caused by high assembly stress in the actual assembly process.Firstly,the pipe assembly process’geometric modeling is carried out using geometric modeling method,and a new modeling method based on axis vector is proposed.On this basis,the Rodrigues formula is used to establish a pipe space pose calculation model based on actual assembly conditions.Then,the assembly constraints are analyzed,and the key constraint features are identified based on the pipe assembly requirements.Subsequently,the pipe assembly scenarios under different constraint forms are analyzed,and the pipe error compensation methods under a single constraint and associated constraint are respectively proposed.Finally,a typical flaring pipe is selected for the test;the pipe assembly error compensation calculation and the pipe installation air tightness test are carried out,respectively.The results show that the proposed method could effectively realize the theoretical space pose adjustment and the pipe parameter compensation,and the air tightness of the compensated pipe is better than that of the uncompensated one.