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By translationally moving a magnetic source above a conductive plate guideway both levitation and drag forces are created. Unfortunately, the electrodynamic drag force can be quite high [1]. Kratz studied a double Halbach array topology, such as shown in Fig 1 [1], and used a simple curve fitting approximation to model the forces. Kratz experimentally showed that a significant reduction in drag force...
Valve actuator is a critical component of the electromagnetic valve in the pneumatic steering gear. By controlling the action and release of the actuator, the gas circuit can be switched, thus to control the attitude adjustment of the missile. The traditional actuator is solenoid structure. In order to satisfy the demand of saving energy, lowering the driving power of the coil and providing enough...
The competition between enterprises has been gradually replaced by that between supply chains. Nowadays, suppliers and buyers are cooperative associates and work in the competition together with each other, which used to be competitive forces. However, they are still separate units and transaction cost still exists as a prime cost between enterprises in supply chain today. Through the analysis of...
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