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The actuator is the essential part of the automatic control system of the diesel crankshaft rotation frequency. The actuator on base of the linear electromagnet is considered. The purpose of this paper is to determine the conditions of receiving minimum of the weight and to optimize the parameters of the actuator. The exact calculation of the leakage of the magnetic flux and the parameters of magnetic circuit allows to find the characterisctics of the actuator precisely. In order to investigate the magnetic field in the axi-simmetric and planar complex shaped bodies such a stator and rotor of the electrical machines we have to solve Maxwell equations in these bodies. In this paper we use the Finite element method to calculate the magnetic field because it makes possible to avoid the dificulties connected with the complex shape of the system. The results of this paper allows to choose the material, configuration and parameters of the actuator optimally.

The problems of calculating non-steady temperature fields, in complex shaped axi-symmetric bodies in the processes of plastic forming as well as in working processes of ICE are concerned. A mixed method of solving this problem is proposed. According to this method, an axis section region of a complex shaped body is mapped conformally into a rectangle. A reduced boundary value problem for heat transfer is solved in this rectangle. The numerical method of a time-depending heat transfer modelling at the forming processes of impeller disk of a gas turbine is concerned.