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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in 1868 "On Governors," that was able to describe the instabilities exhibited by the fly ball governor. He utilized differential equations in order to describe the control system. This paper demonstrated the usefulness and importance of mathematical models and methods in relation to comprehending complicated phenomena. It also signaled the start of mathematical control and systems theory. Previous elements of control theory had appeared before by not as dramatically and as convincingly as in Maxwell's analysis.
In the following one hundred years control theory made huge strides. New developments in mathematical techniques made it feasible to more precisely control significantly more dynamic systems as opposed to the first fly ball governor. These updated techniques include 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 technology and applications of control methodology have helped produce cleaner auto engines, more efficient and cleaner chemical processes and have helped make communication and space travel satellites possible.
Primarily, control engineering was performed as a part of mechanical engineering. Additionally, control theory was first studied as part of electrical engineering in view of the fact that electrical circuits could often be simply described with control theory techniques. At present, control engineering has emerged as a unique discipline.
The first controls had current outputs represented with a voltage control input. In order to implement electrical control systems, the proper technology was unavailable then, the designers were left with less efficient systems and the alternative of slow responding mechanical systems. The governor is a very effective mechanical controller which is still normally utilized by some hydro plants. Eventually, process control systems became accessible previous to modern power electronics. These process controls systems were normally used in industrial applications and were devised by mechanical engineers utilizing pneumatic and hydraulic control equipments, many of which are still being used at present.
Hydraulics
The forklifts hydraulics are the muscles of the vehicle, giving 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 positioned so as\to be able to prolong part life by minimizing 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 considered in order to keep the operator as comfortable as possible.
