Resolution of a linear and a nonlinear inverse problem in magnetostatics

This paper deals with the solution of inverse problems in magnetostatics. The cases the authors have broached are finding the current density or positions of air coils on the basis of magnetic field measurements. These problems are ill-posed, so regularization techniques are needed. The authors discuss the main iterative regularization principles, and the stability issues of these inverse problems. This method is applied to MRI magnets. Numerical results are presented

Stirling machine as auxiliary power unit for range extender hybrid electric vehicles

International audienceStirling machine as auxiliary power unit for range extender hybrid electric vehicle

A Stirling Engine for Automotive Applications

International audienceThis paper describes a Stirling Engine used as an Auxiliary Power Unit in a Series Hybrid Vehicle. The engine modeling is presented, then its integration in the vehicle power train is described. Fuel consumption, power train efficiency are compared between Stirling Engines and Spark ignition Engines. The results show that Stirling engines present good performances compared to internal combustion engines in the same configuration. Finally, the prototype design and first results are presented

A Stirling engine for hybrid vehicles applications

International audienceThis paper describes a Stirling Engine used as an Auxiliary Power Unit in a Series Hybrid Vehicle. Integration of the Stirling engine in the vehicle power train is described. Using a vehicle model, fuel consumption is compared between Stirling Engines and Spark ignition Engines. The results show that Stirling engines present good performances compared to internal combustion engines in the same configuration. Finally, the prototype design and first experimental results are presented

Etude expérimentale d’un moteur Stirling pour une application de véhicule hybride

International audienceRésumé – cet article présente une étude expérimentale d’une machine Stirling destinée à une application de véhicule hybride. Un prototype de puissance théorique 10 kW a été développé avec le groupe PSA avec comme gaz de travail de l’azote. Le banc d’essai utilisé pour valider le prototype est décrit. Les résultats présentés détaillent la marche du moteur à vide : pression au cours du cycle, températures, couple et vitesse instantanés, pertes dans les circuits de refroidissement.Experimental study of a Stirling engine for a hybrid vehicleAbstract – this article presents an experimental study of a Stirling machine for a hybrid vehicle application. A 10 kW theoretical power prototype has been developed with Groupe PSA using nitrogen as a working gas. The test bench used to validate the prototype is described. The results presents detailed operation of the machine in engine mode at no load : cycle pressure, temperatures, instantaneous torque and speed, losses in the cooling circuits

Resolution of linear magnetostatic inverse problem using iterative regularization

This paper deals with the solution of linear inverse problems in magnetostatics. The case the authors have broached is finding the current density on the basis of magnetic field values. Solving this kind of equation is an ill-posed problem. Exact magnetic field values and measured values lead to different cases, each of which is presented. To solve them, the authors use the conjugate gradient method with iterative regularization. They present numerical results for the design of magnets, gradient and shim coils, and numerical results for the problem of recovering current density values from measured field values