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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in 1868 "On Governors," that can describe the instabilities exhibited by the fly ball governor. He made use of differential equations so as to describe the control system. This paper demonstrated the importance and helpfulness of mathematical methods and models in relation to understanding complex phenomena. It also signaled the beginning of systems theory and mathematical control. Previous elements of control theory had appeared before by not as convincingly and as dramatically as in Maxwell's analysis.
New developments in mathematical techniques and new control theories made it possible to more precisely control more dynamic systems compared to the original model fly ball governor. These updated techniques consist of different developments in optimal control during the 1950s and 1960s, followed by development in stochastic, robust, adaptive and optimal control methods during the 1970s and the 1980s.
New applications and technology 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.
In the beginning, 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 explained with control theory techniques. Today, control engineering has emerged as a unique practice.
The first controls had current outputs represented with a voltage control input. To be able to implement electrical control systems, the proper technology was unavailable then, 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 used by various hydro plants. Eventually, process control systems became accessible before modern power electronics. These process controls systems were often utilized in industrial applications and were devised by mechanical engineers using hydraulic and pneumatic control machines, lots of which are still being used these days.
Hydraulics
The forklifts hydraulics are the vehicle's muscles, providing the necessary force to raise many heavy loads. All Yale trucks feature industrial grade hydraulic components. Several of these components consist of: 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 positioned in order to prolong part life by minimizing exposure to heat sources.
The Yale forklift can withstand the most extreme working situations coming out on top with their great reliability. These machinery have been constructed in such a precise way that attention to detail has been considered in order to keep the operator as comfortable as they can be.
