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Engine systems
Published in David Wyatt, Mike Tooley, Aircraft Electrical and Electronic Systems, 2018
Ignition energy for piston engines is generated from a magneto; this provides pulses of electrical power via a distributor to spark plugs in each of the engine cylinders. The magneto operates on the principle of electromagnet induction (Fig. 10.3); it is a combined four-pole permanent magnet generator and autotransformer and can be used where there is no aircraft battery. The engine drives the input shaft of the magneto rotor via a gearbox; the relative movement of transformer windings and the poles of a permanent magnet can be arranged in one of three ways: The transformer coils are on the shaft and the magnet is fixed to the housing (rotating armature type)The permanent magnet is rotated by the shaft within stationary coils of the transformer (rotating magnet type)A soft iron inductor is rotated between the permanent magnet and transformer windings (polar inductor type).
Multi-field coupling thermo-acoustic radiation using free-standing nano-thin films in a static magnetic field
Published in Journal of Thermal Stresses, 2019
Yida Mao, C. W. Lim, Tianyun Li
The effects of varying electric current on the thermo-acoustic and magneto-acoustic radiation are illustrated in Figures 7–9. The amplitude of the electric current changes from to with intervals The thermo-acoustic radiation is rather constant while the magneto-acoustic radiation drops with increasing frequency. It is noticed that the thermo-acoustic radiation increases faster than magneto-acoustic radiation for increasing electric current. This is because thermo-acoustics is driven by the input power, which is proportion to while magneto-acoustics is excited by electro-magnetic loading, which is proportional to As expected, fluctuation of the mixed acoustic response becomes smaller for increasing electric current, as the thermo-acoustic effect becomes gradually more dominant.
Magneto-electric self-powered electrical output and ignition performance of a multifunctional projectile under impact loading
Published in Waves in Random and Complex Media, 2023
Enling Tang, Zhen Zhang, Xingyong Gao, Yafei Han, Chuang Chen, Mengzhou Chang
The magneto-electric self-powered ignition system consists of an electric ignition head, an induction coil and a sintered NdFeB magnet. The electric ignition head is at the head of the self-powered ignition system and forms a series circuit with the induction coil and in contact with the Al/PTFE active material sparse powder. The electric ignition head consists of a bridge wire, an ignition charge and a wire. The bridge wire resistance of the electric ignition head is 2.7 Ω. The material parameters of the electric ignition head bridge wire are shown in Table 1. A high-speed impact experiment was designed. Figure 2 shows the structure of the magneto-electric self-powered ignition system.