Linear Servo Loop Systems
Résumé
Following Wikipedia a system is a set of interacting or interdependent
components forming an integrated whole.
System control exists for more than 2000 years. Water clocks control was one
of the rst application of system control. Nevertheless the scienti c approach
appears after the mid of the 19th century. In 1868 James Clerk Maxwell (1831-
1879) published a paper entitled "On Governors" within which he described
how to derive the linear dierential equations for various governor mechanisms.
In 1798 James Watt (1736-1819) developed the automatic control of the speed
of a steam motor.
The theory of control has been developed during the rst half of the 20th
century both in the western countries and in the ex-URSS but the motivations
were dierent. Indeed they were based on mathematical interests in the East.
For example Nicholas Minorsky (1885-1970) presented in 1922 a clear analysis
of the control involved in position control systems and formulated a control law
that we now refer to PID control. On the other side engineering issues were the
main drivers in the West. In 1914 Lawrence Burst Sperry (1892-1923) invented
the rst autopilot which he demonstrated with success in France. In the US
telephone repeaters based on electronic ampli cation of the signal were used
around 1920 but the distortion they introduced limited the number that could
be used in series. Harold Stephen Black (1898-1983) developed the electronic
ampli er with negative feedback in 1927 to overcome the issue.
Domaines
Sciences de l'ingénieur [physics]
Origine : Fichiers produits par l'(les) auteur(s)
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