525 Hydraulic System Optimization for Fly-By-Wire Control
Track: Simcenter User Connection
The Bell 525 is he world's first commercial helicopter to incorporate fly-by-wire flight controls. Fly-by-wire features will allow unparalleled safety and decreased pilot workload - especially for operation in austere environments. To support the unique requirement of a commercial fly-by-wire flight control systems, the 525 design needed to incorporate three functionally identical, seperate and continuously operating hydraulic systems. Any one system is independently capable of incorporates complete system separation so that a hydraulic failure in one hydraulic system can no affect the other systems. To ensure that the flight control system operate within required tolerances, thermal aspects of the three hydraulic systems are closely regulated. This unique Fly-by-wire architecture was optimized for weight, ease of aircraft manufacturing/assembly, reliability, and field maintenance by using a technical approach that integrates system components to create rugged individual line replaceable units (LRU's). The integration concept was validated early in the 525 program by development testing of the components. This approach ensured that the aircraft build schedule would not be impacted by the hydraulic system design. Thermal design of the hydraulic system was optimized using Dynamic Physics based Amesim Hydraulic Systems Models to achieve weight targets of the hydraulic fluid conveyance system, and to fully validate the functional performance of the system. The sum total of these efforts led to an elegant 525 hydraulic system design which is successfully supporting 525 flight test activities.