Application of Forecasting and Health Management (PHM) technology in the new generation of fighter aircraft engines abroad

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Excerpted from a journal

With the increasing performance requirements of advanced fighter jets, the structure of their engines has become increasingly complex and works under harsh conditions such as temperature, pressure, faster rotation and high stress. Therefore, the status monitoring and fault diagnosis of the engine is an effective way to reduce aircraft flight safety and reduce usage and support costs. In the past decade, in order to reduce maintenance manpower, increase the number of dispatching frames, and realize state-based maintenance (CBM) and autonomous support, advanced fighter jets and their engines have further developed from status monitoring and fault diagnosis technology to prediction and health management (PHM) technology.

one,Development of PHM technology

PHM technology is based on enhanced diagnostic capabilities, that is, the ability to determine the status of components completing their functions with relatively fault diagnosis capabilities and very low false alarm rates.

The development of PHM technology has gone through the development and evolution process from external testing to in-flight testing (BIT) → testability becoming an independent discipline → the proposal and development of comprehensive diagnosis → the formation of prediction and health management (PHM) systems.

PHM systems are becoming an integral part of the design and use of a new generation of aircraft, ship and vehicle systems. PHM technology has been widely used in military fields such as military helicopters, fixed-wing aircraft and missiles, civil aircraft, automobiles, bridges, nuclear power plants, large dams, etc., and has become a veritable military-civilian dual-use technology in the 21st century.

The following details are introducedA typical application case of PHM technology in the EJ200 engine of the new generation of fighter EF-2000 "Typhoon" in Europe and the United States.

two,EJ200 engine status monitoring system

Euro fighterThe EF-2000 Engine Status Monitoring System (ECMS) provides a comprehensive function to complete engine testability, fault positioning and other monitoring requirements. This function is accomplished by the digital electronic control unit (DECU), the engine monitoring unit (EMU), and the ground support system (GSS) device.

Engine monitoring unit (EMU) is the central processing unit for the EJ200 engine monitoring, which is installed in the aircraft avionics compartment cabin and is cooled by air (Figure 1). It includes two basically consistent and independent lines for monitoring the two EJ200 engines of the EF2000 aircraft.

EMU is dedicated to engine monitoring functions, but DECU plays an important role in collecting monitoring data, although it is mainly used for engine control. The two devices are connected via a bidirectional digital data bus.

The DECU is mounted on the engine and is cooled by fuel. It consists of two identical lines that communicate through an internal interface. The basic function of the DECU is to control the engine's unforced and afterburned fuel flow, in order to operate the engine normally over the entire working range. In addition, the DECU performs in-machine test (BIT) function to determine the health of the engine control system and can achieve slow down function in the event of defects.

The DECU is the source of cockpit alarm, while the EMU is the device that collects and transmits all data to the corresponding aircraft system for maintenance and post-flight analysis (Figure 2). Among all other information, the EMU specifically reports all events and fault diagnosis results to the aircraft interface processing unit (IPU), for displaying on-board maintenance data panel (MDP) information, and transmits information to the ground support system through a portable maintenance data memory (PMDS). The EMU also provides data through the IPU to the crashed survivable memory unit (CSMU) and mass storage devices (BSD) that store alternative data for specialized investigations.

3. Development trends of engine health management technology

Currently, engine health management technology mainly shows the following development trends:

1. Real-time:Recent diagnosissystemResponse speedand efficiency, achieve real-time diagnosis。

2. Intelligent:The engine has self-diagnosis, self-prediction, self-optimization and task adaptability。

3. Integration:Realize the integration of engine control and flight control。

4. Networking:Integrate the monitoring, diagnosis and maintenance technology of aircraft engines into the network environment, greatly improving the accuracy and timeliness of engine difficult fault diagnosis。

5. Openness:The system structure adopts modular design and recognized interface standards。

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