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In this paper, the model of engineering ship was presented. The ship has no movements' ability by itself. Its' motion is adjusting the length of anchor chain controls the course of engineering ship. It limits the moving scope of the ship and makes it not drift about wantonly. But while moving and mooring the ship, because wind, wave, flow and various kinds of random influence is difficult to be predicted,...
A retrofitted electro-hydraulic proportional system for hydraulic excavator was introduced firstly. According to the principle and characteristic of load independent flow distribution(LUDV) system, taking boom hydraulic system as an example and ignoring the leakage of hydraulic cylinder and the mass of oil in it, a force equilibrium equation and a continuous equation of hydraulic cylinder were set...
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