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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in the year 1868 "On Governors," that can explain the instabilities exhibited by the fly ball governor. He utilized differential equations to be able to describe the control system. This paper demonstrated the importance and helpfulness of mathematical methods and models in relation to understanding complicated phenomena. It likewise signaled the start of mathematical control and systems theory. Previous elements of control theory had appeared before by not as convincingly and as dramatically as in Maxwell's study.
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 comprise various developments in optimal control in the 1950s and 1960s, followed by development in stochastic, robust, adaptive and optimal control techniques in the 1970s and the 1980s.
New technology and applications of control methodology have helped make cleaner auto engines, more efficient and cleaner chemical processes and have helped make communication and space travel satellites possible.
Initially, control engineering was performed as just a part of mechanical engineering. Control theories were initially studied with electrical engineering as electrical circuits could simply be described with control theory methods. At present, control engineering has emerged as a unique discipline.
The first control partnerships had a current output that was represented with a voltage control input. Since the proper technology to implement electrical control systems was unavailable then, designers left with the alternative of slow responding mechanical systems and less efficient systems. The governor is a very effective mechanical controller which is still often used by several hydro plants. Ultimately, process control systems became available before modern power electronics. These process controls systems were usually utilized in industrial applications and were devised by mechanical engineers using pneumatic and hydraulic control equipments, many of which are still being used these days.
Hydraulics
The hydraulics are the forklift's "muscles". They give the necessary force needed to lift heavy loads during the entirety of a long shift. All Yale trucks feature industrial grade hydraulic parts. Some of these parts include: heavy-duty hydraulic valves, leak resistant O-ring face seal fittings, long lasting tilt and hoist cylinders, and fine micron filters. The control valve has been strategically placed so as\to be able to prolong part life by minimizing exposure to heat sources.
The Yale forklift could withstand the most extreme working situations coming out on top with their great reliability. These machines have been constructed in such a precise way that attention to detail has been taken into consideration in order to keep the operator as comfortable as possible.
