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Fluid Power System Dynamics This minibook was created because system dynamics courses in the standard mechanical engineering curriculum do not cover fluid power, even though fluid power is essential to mechanical engineering and students entering the work force are likely to encounter fluid power systems in their job. Most system dynamics textbooks have a chapter or part of a chapter on fluid power but typically the chapter is thin and does not cover practical fluid power as is used in industry today. For example, many textbooks confine their discussion of fluid power to liquid tank systems and never even mention hydraulic cylinders, the workhorse of today’s practical fluid power.
Fluid power is the transmission of forces and motions using a confined, pressurized fluid. In hydraulic fluid power systems the fluid is oil, or less commonly water, while in pneumatic fluid power systems the fluid is air. Fluid power is ideal for high speed, high force, high power applications. Compared to all other actuation technologies, including electic motors, fluid power is unsurpassed for force and power density and is capable of generating extremely high forces with relatively lightweight cylinder actuators. Fluid power systems have a higher bandwidth than electric motors and can be used in applications that require fast starts, stops and reversals, or that require high frequency oscillations. Because oil has a high bulk modulus, hydraulic systems can be finely controlled for precision motion applications. 1 Another major advantage of fluid power is compactness and flexibility. Fluid power cylinders are relatively small and light for their weight and flexible hoses allows power to be snaked around corners, over joints and through tubes leading to compact packaging without sacrificing high force and high power. A good example of this compact packaging are Jaws of Life rescue tools for ripping open automobile bodies to extract those trapped within. Fluid power is not all good news. Hydraulic systems can leak oil at connections and seals. Hydraulic power is not as easy to generate as electric power and requires a heavy, noisy pump. Hydraulic fluids can cavitate and retain air resulting in spongy performance and loss of precision. Hydraulic and pneumatic systems become contaminated with particles and require careful filtering. The physics of fluid power is more complex than that of electric motors which makes modeling and control more challenging. University and industry researchers are working hard not only to overcome these challenges but also to open fluid power to new applications, for example tiny robots and wearable power-assist tools.
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"Fluid Power System Dynamics"
Mon Apr 04, 2011 08:40:39 AM
I am so sorry that document unable to download before. But the link has been fixed and Now enjoy the Fluid Power Document. I hope engineer or people who working in related topic helped with the document. Admin
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