Induction heat treatment is an important tool in metallurgy. Induction annealing is a complex yet efficient manufacturing process with great potential for quality control of produced parts. Induction annealing is rarely used, but has its place and the control methods are similar to induction hardening. It allows much greater control over convection type heat treatment and allows more easily treating only selected regions on the material. One of the obstacles with heat treatment of brass parts is that it is not possible to get a direct reading with the infrared temperature sensor off the surface, therefore making the induction method heat treatment more practical than convection, as it offers almost direct control of the amount of energy inserted into material. We used induction to stress relief and anneal a hollow brass material cylinder to the desired hardness gradient. Four types of variables were controlled until the desired result was found. They are in shape of solenoid, location of solenoid in relation to the part, maximum power used and total induction time. Hardness was measured both on the outer surface of the parts and on parts cut in half. Hardness was measured using appropriate scale measurement systems using the Vickers scale. It was found that hardness differs on the surface measurement from the measurement on the inside, yet there seems to be a certain correlation on the differing amount. Induction offers a very quality controllable process with little difference in hardness form part to part. Empirical optimization is very time consuming and investing time in creating a mathematical model to do the bulk of optimization could be worth it.

In this paper various simple plane configurations of the wings of the actuators by motion investigations in fluid (water or air) are being reviewed. The first part of the report deals with the investigation of motion of a single degree of freedom (1DOF)-rotation system. The rotational motion equations are obtained by the relations of classical mechanics. An approximate one-sided interaction of the fluids and wing elements is described by the exchange the momentum of the fluid particle flux impact. Approximate correlations are obtained for modeling the rotation motion with different actuator excitations. The possibilities of adding a rotary linear or non-linear spring are analyzed. The possibility of blocking the actuator's movement with a stop is considered. In the second part of the report, plane motion of the object is analyzed taking into account the results of the first part of investigations. An analysis is carried out to synthesize the actuator's application for objects flying or diving motion excitation in robot technics.