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A study on helicopter main gearbox planetary bearing fault diagnosis

机译：直升机主变速箱行星轴承故障诊断研究

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摘要

The condition monitoring of helicopter main gearbox (MGB) is crucial for operation safety, flight airworthiness and maintenance scheduling. Currently, the helicopter health and usage monitoring system, HUMS, is installed on helicopters to monitor the health state of their transmission systems and predict remaining useful life of key helicopter components. However, recent helicopter accidents related to MGB failures indicate that HUMS is not sensitive and accurate enough to diagnose MGB planetary bearing defects. To contribute in improving the diagnostic capability of HUMS, diagnosis of a MGB planetary bearing with seeded defect was investigated in this study. A commercial SA330 MGB was adopted for the seeded defect tests. Two test cases are demonstrated in this paper: the MGB at 16,000 rpm input speed with 180 kW load and at 23,000 rpm input speed with 1760 kW load. Vibration data was recorded, and processed using signal processing techniques including self-adaptive noise cancellation (SANC), kurtogram and envelope analysis. Processing results indicate that the seeded planetary bearing defect was successfully detected in both test cases.
机译：直升机主变速箱（MGB）的状态监视对于操作安全，飞行适航性和维护计划至关重要。当前，直升机的健康和使用情况监视系统HUMS已安装在直升机上，以监视其传输系统的健康状态并预测关键直升机组件的剩余使用寿命。但是，最近发生的与MGB故障相关的直升机事故表明，HUMS不够灵敏和准确，无法诊断MGB行星轴承缺陷。为了有助于提高HUMS的诊断能力，本研究对带有种子缺陷的MGB行星轴承的诊断进行了研究。采用商业SA330 MGB进行种子缺陷测试。本文演示了两个测试用例：MGB，输入速度为16,000 rpm，负载为180 kW，以及输入速度为23,000 rpm，负载为1760 kW。记录振动数据，并使用信号处理技术进行处理，包括自适应噪声消除（SANC），峰度图和包络分析。处理结果表明，在两个测试案例中都成功地检测到了种子状行星轴承缺陷。

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