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In the expansion of composite material application, it is one of the most important subjects in assembly of aircraft structure how drilling of composite/metal stack should be processed in an efficient way. This paper will show the result of development of a drill bit for CFRP/Aluminum-alloy stack by Kawasaki Heavy Industries (KHI) and Sumitomo Electric Hardmetal (SEH). In order to improve workability and economic performance, the drill bit which enables drilling CFRP/Al-alloy stack: at 1 shot; from both directions; without air blow and coolant (just usual vacuuming); was required. A best mix drill bit which has smooth multi angles edge and pointed finishing edge was produced as a result of some trials. Developed drill bit achieved required performance and contributed to large cost reduction, labor hour saving, production speed increase and work environment improvement.

The electric active stabilizer suspension system, which can reduce roll angle, has been developed. This paper presents the configuration, function and effect of the system. The electric active stabilizer suspension system performs not only decreasing roll angle but good fuel consumption. The rotary actuator of this system consists of the DC brushless motor and strain wave gearing. It has been confirmed that the system achieved target roll angle and contributed to improve fuel consumption compare to hydraulic system.

As the design stress of the helical coil spring is increased to reduce the mass, the problem of riding comfort has come to the fore. To find out the solutions which compatibly satisfy the riding comfort and the mass reduction, we made the study of the side force of helical coil springs by using the finite element code ABAQUS. In the present analysis, the specifications of the spring which minimize the side force are discussed. Moreover, the effect of the tilting angle of a spring seat and of the kinematic condition of the spring on the side force is investigated.