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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 clarify the instabilities exhibited by the fly ball governor. He used differential equations to be able to describe the control system. This paper exhibited the importance and helpfulness of mathematical methods and models in relation to understanding complex phenomena. It even signaled the start 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 study.
New control theories and new developments in mathematical techniques made it possible to more accurately control more dynamic systems than the first model fly ball governor. These updated methods include various developments in optimal control during the 1950s and 1960s, followed by development in stochastic, robust, adaptive and optimal control methods in 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 communication and space travel satellites possible.
Initially, control engineering was performed as just a part of mechanical engineering. Control theories were firstly studied with electrical engineering in view of the fact that electrical circuits can simply be described with control theory techniques. Now, control engineering has emerged as a unique discipline.
The first control relationships had a current output that was represented with a voltage control input. Because the proper technology to be able 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 really effective mechanical controller which is still often used by some hydro plants. Ultimately, process control systems became accessible previous to modern power electronics. These process controls systems were usually used in industrial applications and were devised by mechanical engineers using pneumatic and hydraulic control devices, many of which are still being used at present.
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 parts. Several of these parts consist of: leak resistant O-ring face seal fittings, heavy-duty hydraulic valves, fine micron filters and long lasting hoist and tilt cylinders. The control valve has been strategically positioned so as\to be able to prolong part life by lessening exposure to heat sources.
Yale's diesel forklifts provide extreme reliability and are recognized for withstanding harsh working conditions and coming out on top. These machinery 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.
