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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in the year 1868 "On Governors," which was able to describe the instabilities demonstrated by the fly ball governor. He utilized differential equations so as to describe the control system. This paper exhibited the usefulness and importance of mathematical methods and models in relation to understanding complex phenomena. It even signaled the beginning of systems theory and mathematical control. Previous elements of control theory had appeared before by not as dramatically and as convincingly as in Maxwell's analysis.
New developments in mathematical techniques and new control theories made it possible to more accurately control more dynamic systems compared to the original model fly ball governor. These updated techniques comprise various developments in optimal control in the 1950s and 1960s, followed by advancement in robust, stochastic, optimal and adaptive control techniques in the 1970s and the 1980s.
New technology and applications of control methodology have helped make cleaner auto engines, cleaner and more efficient chemical processes and have helped make space travel and communication satellites possible.
Initially, control engineering was practiced as a part of mechanical engineering. Additionally, control theory was firstly studied as part of electrical engineering in view of the fact that electrical circuits can often be simply explained with control theory methods. Today, control engineering has emerged as a unique practice.
The first controls had current outputs represented with a voltage control input. So as to implement electrical control systems, the proper technology was unavailable at that moment, the designers were left with less efficient systems and the option of slow responding mechanical systems. The governor is a very efficient mechanical controller which is still usually utilized by some hydro plants. Eventually, process control systems became accessible prior to modern power electronics. These process controls systems were often used in industrial applications and were devised by mechanical engineers making use of hydraulic and pneumatic control machines, a lot of which are still being used these days.
Hydraulics
The hydraulics are the "muscles" of the forklift. They provide the necessary force required to raise heavy loads during the entirety of a long shift. All Yale trucks feature industrial grade hydraulic parts. Some of these components consist of: heavy-duty hydraulic valves, leak resistant O-ring face seal fittings, long lasting hoist and tilt cylinders, and fine micron filters. The control valve has been strategically positioned in order to prolong component life by reducing 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 machines have been constructed in such a precise manner that attention to detail has been considered so as to keep the operator as comfortable as possible.
