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機械外文翻譯---液壓機-液壓系統-文庫吧

2025-12-16 06:14 本頁面

【正文】 ers to an accuracy of 1 millimeter。 Today most hydraulic systems utilize oil rather than water but the principle is the same. You can press a liquid, and a force that is applied at one point is transmitted to another point by that inpressible fluid. Because of its liquid nature, hydraulic systems can transmit force through pipes of any shape and length, so the force can be applied at one central point and transmitted efficiently to another point or to multiple points far away. Think about the master cylinder in you car39。s brakes and how, by stepping on the brake pedal, you apply stopping pressure on the brakes on all four wheels. Physics Basic physics tells us that we can trade off force for distance in all mechanical systems. In a hydraulic system, we do this by changing the relative size of the pistons at each end of the system. For example, a small piston moving a relatively large distance (say a foot) will exert pressure on a larger piston at the other end. The force will be enough to move a heavy weight a small distance (much less than a foot). Engineers and physicists can calculate exactly how much distance needs to be traveled and the relative sizes of the pistons required to move a particular weight. Hydraulic Engines Water falling from one level to a lower one is used to drive machines like the water wheel and the turbine . The difference in height between the highest and the lowest level is called the head。 The amount of work produced per pound of falling water is proportional to the head. Water power can be produced in this way from many natural sources, such as waterfalls and dammed rivers.。 Where no natural sources are available, an artificial reservoir can be made. When energy is plentiful, it is used to pump water into the reservoir。 the water is then available as a power sourc

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