抄録
The recent technologies of hydraulics and flight controls have been progressing step by step. The research effort for establishing the technology to build 55.2MPa (8000psi) hydraulic system for practical use has begun to fruit around the world, and high-pressurizing is getting to be standardized, shifting from the conventional 20.7MPa (3000psi) system pressure. The system pressure is settling into 34.5MPa (5000psi), which is practical in both cost and performance with the appropriation of the existing parts and ground support equipment considered.
Also, ALL ELECTRIC AIRCRAFT (AEA) technologies proposed more than 20 years ago have begun to come into practical use, such as electric actuators for primary control surfaces, as improved are 270Vdc power source technology, the permanent magnet peformance for electric motors, the power transister capability for control device, and the reliabilities of mechanical parts such as ballscrews and bearings.
This paper discusses the application of new materials to aircraft such as piezoelectric, magnetostrictive, and shape-memory materials, which have recently become stabilized in production and begun to be applied in commercial fields other than aircraft industry.
