Theoretical construction and parameter analysis of torque-angle tightening control model for aviation tube system

Abstract

The assembly quality of the tube system, which serves as the “blood vessels” and “trachea” of the aircraft, has a crucial impact on the stable and reliable service of aircraft. At present, the tightening control method of the tube system is mainly the torque control method, which exhibits considerable discreteness and has difficulty achieving precise control of the assembly quality. This paper constructed a torque-angle tightening control model based on the torque–force relationship and angle–force relationship of aviation tube systems. Through tightening experiments with five tube diameters, the initial tightening degree, re-tightening operation, lubrication condition, tube material, and connector material were investigated by comparing the torque-angle tightening curves. Results showed that the re-tightening operation can increase the tightening torque by at least 8%, the lubrication condition can reduce the target torque by about 16%, and the control angle range can be reduced by about {10}^{\circ }. Further theoretical and experimental analysis revealed that the system stiffness remained stable at 90000 N/mm when the tube diameter was greater than 6 mm. The torque–tension coefficient remained stable at around 0.16, while the angle–tension coefficient gradually decreased with the increase in the tube diameter.

Graphical abstract

Keywords

aviation tube system / theoretical model / torque-angle tightening control / tightening curve

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Higher Education Press