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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in the year 1868 "On Governors," that was able to describe the instabilities demonstrated by the fly ball governor. He used differential equations in order to explain the control system. This paper exhibited the importance and helpfulness of mathematical methods and models in relation to comprehending complicated phenomena. It also signaled the beginning of mathematical control and systems theory. Previous elements of control theory had appeared earlier by not as dramatically and as convincingly as in Maxwell's analysis.
New developments in mathematical techniques and new control theories made it possible to more precisely control more dynamic systems as opposed to the initial model fly ball governor. These updated methods consist of various developments in optimal control during the 1950s and 1960s, followed by progress in stochastic, robust, optimal and adaptive control techniques during the 1970s and the 1980s.
New applications and technology of control methodology have helped produce cleaner auto engines, cleaner and more efficient chemical methods and have helped make space travel and communication satellites possible.
At first, control engineering was practiced as just a part of mechanical engineering. Control theories were initially studied with electrical engineering since electrical circuits could simply be described with control theory techniques. At present, control engineering has emerged as a unique practice.
The very first controls had current outputs represented with a voltage control input. To implement electrical control systems, the proper technology was unavailable at that time, the designers were left with less efficient systems and the choice of slow responding mechanical systems. The governor is a very effective mechanical controller that is still often used by several hydro factories. Eventually, process control systems became obtainable before modern power electronics. These process controls systems were often used in industrial applications and were devised by mechanical engineers using pneumatic and hydraulic control machines, lots of which are still being used nowadays.
Hydraulics
The forklifts hydraulics are the muscles of the vehicle, providing the necessary force to lift many heavy loads. All Yale trucks feature industrial grade hydraulic components. Several of these parts consist of: leak resistant O-ring face seal fittings, heavy-duty hydraulic valves, fine micron filters and long lasting tilt and hoist cylinders. The control valve has been strategically placed so as\to be able to prolong component life by reducing exposure to heat sources.
The Yale forklift can withstand the most extreme working situations coming out on top with their great reliability. These machines have been constructed in such a precise manner that attention to detail has been taken into account so as to keep the operator as comfortable as they can be.
