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Alfred-Marie Liénard | |
|---|---|
| Born | Alfred-Marie Liénard (1869-04-02)2 April 1869 |
| Died | 29 April 1958(1958-04-29) (aged 89) |
| Known for | Liénard equation Liénard–Chipart criterion Liénard–Wiechert potential |
| Awards | Poncelet Prize(1929) |
| Scientific career | |
| Institutions | École des Mines de Saint-Étienne |
Alfred-Marie Liénard (2 April 1869 inAmiens – 29 April 1958 inParis), was a Frenchphysicist andengineer. He is best known for his derivation of theLiénard–Wiechert potentials.
From 1887 to 1889 Liénard was a student at theÉcole Polytechnique and from 1889 to 1892 at theÉcole des mines de Paris. From 1892 to 1895 he was amining engineer inValencia,Marseille, andAngers. From 1895 to 1908 he was professor at theÉcole des Mines de Saint-Étienne and from 1908 to 1911 he was professor of electrical engineering at the École des Mines de Paris. InWorld War I he served in theFrench Army.
Liénard worked in the fields ofelectricity,magnetism, andmechanics. In 1898 (and two years after himEmil Wiechert), he derived what is now called theLiénard–Wiechert potentials. He also investigated problems related to theelasticity and strength of materials, and wrote papers onthermodynamics andhydrodynamics.
Along with M. H. Chipart, Liénard developed theLiénard–Chipart criterion for determining the stability of a continuous-time system of equations.
Liénard was a commander of theLégion d'honneur. He was also vice-president of the Société Française des Électriciens and president of theSociété Mathématique de France.
