Trajectory tracking control is used to effect desired trajectories of a device. In order to more precisely track specified trajectories, or be able to follow more general trajectories, many tracking control algorithms have been proposed. A representative cross-section of these schemes, and their implementations are discussed. A flexible robotic tracking control testbed has been developed which allows implementation of the various schemes.
The influence of grain size on the mechanical properties and limit strains of materials has been studied in the tensile test, hydraulic bulging and in-plane stretching, using 1.0-mm thick brass, aluminium and steel sheets. The limit strains of the materials, as well as the mechanical properties of the brass sheets, were found to be closely related to the square root of the grain diameter. The values of the uniaxial work-hardening exponent for the brass, aluminium and St1403 steel were found to be larger than the biaxial -values. The results of the limit strains obtained from in-plane stretching and hydraulic bulging were found to be related.
This paper proposes a model for the growth of flank wear in milling. It incorporates the predominant mechanisms of wear which are abrasion and diffusion and also accounts for thermal fatigue and the effect of the number of teeth. The results obtained are compared to actual data and are shown to be in good agreement.
Surface finishing induces damage such as plastic deformation, residual stresses, and cracking near the finished surface. This damage is characterized by measurement of the residual stress distribution and calculation of crack sizes. A single point indentation model for the evolution of surface damage is described. Finally, processes for controlling finishing induced surface damage are outlined.
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