THE EFFECTS OF WATER CONTENT AND GRAIN SIZE ON THE CLOGGING AND ABRASIVITY OF FINE-GRAINED SOILS IN MECHANIZED EXCAVATION

Clogging during excavation is one of the common problems in mechanized excavation.Among the influential factors in clogging of the cutter head, we can mention the percentage of fine soil particles (under 200 mesh sieve), soil moisture, and soil type.In this study, to investigate the mechanism of tunnel excavation in the laboratory, a tunnel excavat

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A nonlilear controller for ship autopilots

Conventional ship autopilots are designed based on Mandolines a linear ship model using pole - placement technique or linear optimal theory.However, in operation, the ship kinematical parameters can go out the linear limits.In this paper, a nonlinear optimal control law based on aggregated variables is presented.The criterion is chosen so Coffee Ta

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