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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in 1868 "On Governors," which was able to describe the instabilities demonstrated by the fly ball governor. He made use of differential equations to explain the control system. This paper demonstrated the usefulness and importance of mathematical models and methods in relation to understanding complicated phenomena. It even 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.
New control theories and new developments in mathematical techniques made it possible to more accurately control more dynamic systems compared to the initial model fly ball governor. These updated methods comprise different developments in optimal control in the 1950s and 1960s, followed by progress in robust, stochastic, 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 space travel and communication satellites possible.
Originally, 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 controls had current outputs represented with a voltage control input. To implement electrical control systems, the correct technology was unavailable at that time, the designers were left with less efficient systems and the alternative of slow responding mechanical systems. The governor is a very efficient mechanical controller which is still usually utilized by several hydro plants. Eventually, process control systems became available previous to modern power electronics. These process controls systems were often used in industrial applications and were devised by mechanical engineers utilizing pneumatic and hydraulic control devices, lots of which are still being used at present.
Hydraulics
The forklifts hydraulics are the vehicle's muscles, giving the necessary force to raise numerous heavy loads. All Yale trucks feature industrial grade hydraulic parts. Several of these components consist of: heavy-duty hydraulic valves, leak resistant O-ring face seal fittings, fine micron filters and long lasting tilt and hoist cylinders. The control valve has been strategically positioned so as\to be able to prolong component life by reducing exposure to heat sources.
Yale's diesel forklifts provide extreme dependability and are recognized for withstanding harsh working situations and coming out on top. These machinery have been constructed in such a precise way that attention to detail has been taken into consideration to be able to keep the operator as comfortable as possible.
