液压系统广泛应用于商用飞机,比如操纵起落架、轮胎、制动、飞行控制、推动转向器等其他飞行与安全相关的部件,系统的可靠性对飞行安全非常重要,因此在飞机停飞之前通过预测型维修发现问题非常必要。

ATA Chapter 29 hydraulic systems are widely used in commercial aircraft to operate landing gear, wheels, brakes, flight controls, thrust reversers and other flight- and safety-critical components. Their reliability is thus critical to efficient flying, and doing predictive maintenance before defects ground aircraft can be a huge gain.

幸运的是,液压系统很适合通过预测型维修进行监测和分析。霍尼韦尔Forge相关维修公司的产品经理约什-梅林表示,每架飞机都有详尽的液压系统健康数据,这些都是预测型维修的可用资料,同时,预测型维修也能满足诸如空客A350等最新一代飞机的需求。

Fortunately, hydraulic systems seem to be amenable to the kind of monitoring and algorithm development that predictive maintenance relies on. Josh Melin, product line director at Honeywell Forge Connected Maintenance, says any aircraft that captures sufficient and sufficiently frequent parametric data on the health of its hydraulic systems is a good candidate for predictive maintenance on hydraulic systems. This requirement is certainly met by the latest generation of aircraft, such as the Airbus A350.

Forge使用飞机状态监视系统和快速存储记录器的数据发展液压系统的预测模块,技师的状态、故障、检测和更换部件日志对预测也很有帮助。

Forge uses both aircraft condition monitoring system and quick access recorder data to develop its predictive models for hydraulics. Also helpful are technician logs that record symptoms, failures, troubleshooting actions and replaced parts.

梅林表示,Forge的液压系统预测工具能减少80%的停飞事件和40%的最低装备清单(MEL)事件。“这意味着我们的产品能发现液压系统80%的可能故障,这些故障通常会造成运营中断。我们的产品也能在液压系统达到最低设备清单事件之前发现大约40%的故障。故障预警相对很少,因为公司的液压预测模型准确率高达95%。”

Melin says Forge’s predictive tools for hydraulics are able to reduce 80% of delay events and 40% of minimum equipment list events. “That means our solution can catch on average 80% of the imminent failures on the hydraulic LRUs that we cover before they become failures that impact the operation that would cause operational interruptions. And our solution can catch on average 40% of the imminent failures on the hydraulics LRUs that we cover before they would become an MEL (minimum equipment list) event.” He says false warnings are relatively rare. “The accuracy of our hydraulics predictive models is over 95%.”

但是,Forge发展的预测工具还相对年轻。梅林表示,迄今只有36架飞机使用了Forge的液压系统预测维修工具。

Still, this is a relatively young field for Forge’s predictive tools. Melin says that only 36 aircraft so far are using Forge predictive maintenance for hydraulics.