C e n t r u m v o o r W i s k u n d e e n I n f o r m a t i c a
MAS
Modelling, Analysis and Simulation
Modelling, Analysis and SimulationManifold-mapping optimization applied to linear actuator design ABSTRACT Optimization procedures in practice are based on highly accurate models that typically have an excessive computational cost. By exploiting auxiliary models that are less accurate but much cheaper to compute, space-mapping has been reported to accelerate such procedures. However, the space-mapping solution does not always coincide with the accurate model optimum. We introduce manifold mapping, an improved version of space mapping that finds this precise solution with the same computational efficiency. By an example in linear actuator design we show that our technique delivers a significant speed-up compared to other optimization schemes.2000 Mathematics Subject Classification: 65K10, 65M60, 65N55, 65Y20, 90C31
Engineering optimization procedures employ highly accurate numerical models that typically have an excessive computational cost, e.g. finite elements (FE). The space mapping (SM) technique speeds up the minimization procedure by exploiting also simplified (less accurate) models. We will use the SM terminology of fine and coarse in order to refer to the accurate and inaccurate models, respectively. SM implementation in the field of electromagnetic actuators design, in the context of constrained optimization, is a rather unexplored topic. A linear voice coil actuator is chosen as a benchmark test example. The key element in SM is the so-called SM function, which efficiently corrects the imprecise results that can be obtained with just coarse information. SM is used to solve a shape optimization problem. The design problem is stated as a minimization in which the computational cost lies completely in the constraint evaluation, thus SM is applied only to the constraints. A mathematical description of the approach is presented in this paper and two implementations are compared. The solution of the SM optimization is validated (locally) by means of a standard minimization routine. The numerical results obtained show a high efficiency of the SM-based optimization algorithm, reflected by a significantly low number of fine model simulations and an overall low computational effort.
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Φ Abstract -A novel three-phase double sided flux switching linear motor topology with a stator-to-mover teeth ratio of 19/24 is presented. Finite element analysis of the electromagnetical performance of the initial design is conducted and shows that the topology suffers from an unbalanced EMF in terms of amplitude and phase shift between the three phases. On the other hand a low detent force is observed. By adding end-teeth to the structure, a balanced EMF is obtained, but the detent force also increases. A geometrical optimization is conducted on the end-tooth shape and stator tooth width to reduce the detent force while maintaining a balanced sinusoidal EMF. For the optimization a faster hybrid modeling tool is used. The hybrid model is based on the magnetic equivalent circuit method that employs the boundary element method to accurately determine the air gap permeances of the magnetic equivalent circuit.Index Terms-Flux switching motor, linear motor, magnetic equivalent circuit method, boundary element method.
Most human powered energy harvesting systems are used to power ubiquitously deployed sensor networks and mobile electronics. These systems scavenge power from human activity or derive limited energy from ambient heat, light, or vibrations. In most of these conventional methods users must focus their attention on power generation at the expense of other activities. However, for sustainable electrical power generation, energy could be harvested from everyday activities such as walking, running or even dancing. In this paper systems are analyzed that use human power by walking, or running, where an alternative system has been designed and implemented that generates energy from people dancing in a club environment. It will be shown that power's exceeding walking can be extracted from the system, i.e., maximum 80-100 W or an average of 20-30 W over a time period of 10 s.
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Vehicle manufacturers always strive to improve the vehicle handling and passenger safety and comfort. One of the focus points for the automotive industry is the (semi-)active suspension system for which various commercial technologies are existing, varying from pneumatic to hydraulic. This paper addresses the design considerations of a tubular electromagnetic actuator for semi-active suspension.Index Terms-Design optimization, permanent magnet actuators, road vehicle power systems, space mapping.
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