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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 clarify the instabilities exhibited by the fly ball governor. He utilized differential equations to describe the control system. This paper exhibited the usefulness and importance of mathematical methods and models in relation to comprehending complex phenomena. It even signaled the start of systems theory and mathematical control. Previous elements of control theory had appeared earlier by not as convincingly and as dramatically as in Maxwell's analysis.
New control theories and new developments in mathematical techniques made it possible to more accurately control more dynamic systems as opposed to the first model fly ball governor. These updated techniques consist of different developments in optimal control in the 1950s and 1960s, followed by advancement in robust, stochastic, optimal and adaptive control techniques during the 1970s and the 1980s.
New applications and technology of control methodology have helped make cleaner auto engines, cleaner and more efficient chemical processes and have helped make communication and space travel satellites possible.
Originally, control engineering was carried out as just a part of mechanical engineering. Control theories were originally studied with electrical engineering because electrical circuits could simply be described with control theory techniques. Currently, 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 at that moment, the designers were left with less efficient systems and the choice of slow responding mechanical systems. The governor is a very efficient mechanical controller which is still often utilized by some 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 hydraulic and pneumatic control machines, a lot of which are still being used these days.
Hydraulics
The hydraulics are the forklift's "muscles". They give the necessary force required to raise heavy loads during the entirety of a long shift. All Yale trucks feature industrial grade hydraulic components. Some of these parts include: heavy-duty hydraulic valves, leak resistant O-ring face seal fittings, fine micron filters and long lasting hoist and tilt cylinders. The control valve has been strategically placed so as\to be able to prolong part life by lessening exposure to heat sources.
Yale's diesel forklifts offer extreme dependability and are recognized for withstanding harsh working situations and coming out on top. These machinery have been built in such a precise manner that attention to detail has been taken into account to be able to keep the operator as comfortable as possible.
