Investigation of Current Methods to Identify Helicopter Gear Health

Paula J. Dempsey, D. Lewicki, Dy D. Le
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引用次数: 52

Abstract

This paper provides an overview of current vibration methods used to identify the health of helicopter transmission gears. The gears are critical to the transmission system that provides propulsion, lift and maneuvering of the helicopter. This paper reviews techniques used to process vibration data to calculate conditions indicators (CI's), guidelines used by the government aviation authorities in developing and certifying the Health and Usage Monitoring System (HUMS), condition and health indicators used in commercial HUMS, and different methods used to set thresholds to detect damage. Initial assessment of a method to set thresholds for vibration based condition indicators applied to flight and test rig data by evaluating differences in distributions between comparable transmissions are also discussed. Gear condition indicator FM4 values are compared on an OH58 helicopter during 14 maneuvers and an OH58 transmission test stand during crack propagation tests. Preliminary results show the distributions between healthy helicopter and rig data are comparable and distributions between healthy and damaged gears show significant differences.
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直升机齿轮健康度识别方法的研究
本文概述了目前用于识别直升机传动齿轮健康状况的振动方法。齿轮对提供直升机推进力、升力和机动的传动系统至关重要。本文回顾了用于处理振动数据以计算状态指标(CI)的技术,政府航空当局在开发和认证健康和使用监测系统(HUMS)时使用的指南,商用HUMS中使用的状态和健康指标,以及用于设置检测损伤阈值的不同方法。还讨论了通过评估可比较传输之间的分布差异,为应用于飞行和试验台数据的基于振动的状态指标设置阈值的方法的初步评估。在一架OH58直升机的14次机动和一架OH58传动试验台的裂纹扩展试验中,比较了齿轮状态指示器FM4的值。初步结果表明,健康直升机和钻机数据之间的分布具有可比性,健康齿轮和损坏齿轮之间的分布存在显著差异。
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