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Improvement of Flight Safety on Configuration Change of Rotorcraft Wiper Arm

회전익 항공기의 와이퍼 암 형상변경을 통한 비행 안전성 향상

  • Received : 2017.03.03
  • Accepted : 2017.06.09
  • Published : 2017.06.30

Abstract

This paper examines the design for improving the wiper system of rotorcraft. During rotorcraft operation, the wiping performance and excessive clearance can decrease. The wiper system consists of a wiper arm assembly, motor, convertor and flex drive. If there is a problem with the wiper system, the operation ability decreases because the operation is restricted in a rainy environment. There are two main causes of the problem of the wiper system: the lifting forces acting on the wiper arm in aircraft flight and the excessive gap of the components. To remedy these two problems, the wiper arm was improved. The improvements included increased contact pressure on the wiper arm (spring tension), improved gear clearance, and material and shape changes. Durability test, aircraft ground test and flight test were carried out to verify the improved shape, and it was confirmed that the wiping performance and clearance problems were solved. Currently, the rotorcraft is operated without problem by applying the improved shape, and this design improvement process will be a useful reference for future rotorcraft development.

Keywords

Flight Safety;Flight Test;Rotorcraft;Wiper Arm;Wiper System

References

  1. Gerald L. Rogers, Ronald B. Schulte, "Windshield wiper arm", United States Patent, 1982.
  2. Y. J. Hyun, S. H. Kim, S. W. Lee, Y.S. Hwang, Y.H. Moon, K. Y. Hong, "Rotorcraft Wiper Arm Assembly Fatigue Strength Substantiation for Localization", The Korean Society For Aeronautical And Space Sciences, pp. 917-922, 2015.
  3. MIL-A-8866, "Military Specification, Airplane Strength and Rigidity Reliability Requirement, Repeated Load, Fatigue and Damage Tolerance", Naval air systems command(USA), 1987.