The broadband narrow pulse self-focusing ultrasonic transducer was designed for the special structure of the column holes, and used to do the research for the testing of bonding layer of metal composite material with F-scan ultrasonic imaging system. The copper-steel boding layer of bimetal rotor is connected by diffusing welding. There may be delamination flaws existed here. The depth and rang...

Position sensorless control has been widely studied for electrical rotor position estimation. However, because of the magnetic periodicity, mechanical multipole electric machine was hardly reported. By increasing dimensions, this article proposes novel topologies named as dual-gap dual-pole composite machines, where can be demodulated from positions two air gaps. The and corresponding theory ar...

This paper describes the transition towards a composite structure, with same overall aerodynamic characteristics, for tail rotor blade of an IAR330 helicopter. The newly proposed structure is made carbon-roving spar embedded epoxy resin, hexagonal-cell honeycomb core manufactured by fused deposition modelling, and outer skin multiple carbon-fibre-reinforced laminae. was authors using hand lay-u...