Adolf Leonhard

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Adolf Leonhard (born December 18, 1899 in Edelsfeld , Sulzbach district , Upper Palatinate ; † June 25, 1995 in Wilchenreuth, Theisseil municipality , Upper Palatinate) was a German engineer and university professor for electrical engineering and control engineering . He is one of the pioneers who helped shape these fields as well as the specialization in electrical systems.

Career

Adolf Leonhard grew up in the Upper Palatinate and attended elementary school in Wilchenreuth and grammar school in Weiden . Because of the First World War he had prematurely in 1917 his high school years with a Notabitur end, it took place the call-up for military service in a garrison in Erlangen . From 1918 to 1920 he was a French prisoner of war .

From 1920 to 1923 he studied electrical engineering at the Technical University of Munich . He then joined the Siemens-Schuckert works in Berlin as a project manager. After a change to the testing and testing field in 1925 and another change to the assembly department in 1928, it was used all over the world.

In 1929 he received his doctorate with a dissertation on "The independently working three-phase asynchronous generator with separately excited three-phase exciter". In 1936 he began his habilitation at the Technical University of Berlin ; the subject of his habilitation thesis was "Asynchronous and synchronous operation of the general, double-fed three-phase machine".

Act as a professor

In 1936, the electrical engineering department at the TH Stuttgart was reorganized. Shortly before the chair heads Fritz Emde and Emil Veesenmeyer were relieved of their duties due to their age , double replacements were made: Adolf Leonhard for electrical systems (1936), Richard Feldtkeller for communications engineering ( 1936), Heinrich Hess for electrical engineering ( 1938) and Wilhelm Bader for the theory of electrical engineering ( 1939). From August 1936 onwards, Leonhard took over the representation of the chair for electrical systems. His appointment as full professor for electrical systems followed in November 1936.

After the start of the Second World War in 1939, he was called up again for military service and posted to Krakow to monitor and keep the technical works there (gas, electricity, water, tram) in operation. In February 1940 he was able to return to Stuttgart. In the same year he published his basic book "The automatic control in electrical engineering".

As a measure against the threatened air raids, the chair was moved to Ottendorf in 1944 ; the university buildings were then largely destroyed by air raids in 1944. In 1945 Leonhard was dismissed from the service at the TH Stuttgart. In 1948, however, he turned down offers from two universities abroad. In 1949 Leonhard published his well-known book "The automatic regulation". In 1950 he took over the substitute for the sick Professor Graner at his previous chair for "Electrical Systems" at the TH Stuttgart. In 1952 he was reappointed to this chair. In 1953 and 1954 Leonhard also held a visiting professorship at the Technical University in Istanbul .

After reaching the age limit, Leonhard retired at the end of the winter semester 1968 . Even after retiring, he remained closely connected to science. Until 1970 he took over the deputy head of the department.

In June 1995, Adolf Leonhard died at the age of 95 in Wilchenreuth , a district of the municipality of Theisseil in the Upper Palatinate. Since 1926 Adolf Leonhard was married to Helene Kaschkat (1890–1989).

Honors (selection)

Publications (selection)

  • The independently working three-phase asynchronous generator with separately excited three-phase exciter. Springer, Berlin 1930 (dissertation, TH Munich 1929).
  • The automatic control in electrical engineering. J. Springer, Berlin 1940.
  • Static stability with three-phase high-power transmission. Vieweg, Braunschweig 1941, 2nd edition 1942. Vieweg & Teubner, Wiesbaden, ISBN 978-3-663-04052-1 .
  • Electric motors. Enke, Stuttgart 1949, 2nd edition 1959.
  • The automatic regulation. Theoretical basics with practical examples. Springer, Berlin; Göttingen; Heidelberg 1949, 2nd edition 1957, 3rd edition 1962, ISBN 978-3-642-92841-3 .
  • Life memories: childhood, schoolboy, soldier, student, engineer and scientist; 1914-1968 , autobiography, Stuttgart / Wilchenreuth, 1986. [1]

Web links

  • Biography on the website of the University of Stuttgart

literature

  • Eberhard Herter (Ed.): Electrical engineering in Württemberg. Vieweg, Wiesbaden & Teubner, Stuttgart and Leipzig 2012 (reprint of the 1st edition from 1998), ISBN 978-3-322-91842-0 .

Individual evidence

  1. ↑ Life data of Adolf Leonhard in the Landesbibliographie Baden-Württemberg Online, leo-bw.de, accessed on April 29, 2016
  2. ^ A b Entry about Adolf Leonhard in the database of the Wilhelm Exner Medal Foundation .
  3. ↑ Eberhard Herter (Ed.): Electrical engineering in Württemberg. Vieweg, Wiesbaden & Teubner, Stuttgart and Leipzig 2012 (reprint of the 1st edition from 1998), ISBN 978-3-322-91842-0 , p. 243.
  4. ↑ Helene Kaschkat's life data, local newspaper Memeler Dampfboot , No. 8 1989, memel.klavb.lt, .pdf, accessed on April 29, 2016
  5. ^ TU Wien: Honorary doctorates ( Memento from February 21, 2016 in the Internet Archive ). Retrieved August 16, 2016.
  6. ^ Adolf Leonhard Memorial Colloquium , Stuttgart 1999, statistik.baden-wuerttemberg.de, accessed on April 29, 2016
personal data
SURNAME Leonhard, Adolf
BRIEF DESCRIPTION German engineer and university professor for electrical engineering and control engineering
DATE OF BIRTH December 18, 1899
PLACE OF BIRTH Edelsfeld , Sulzbach district , Upper Palatinate
DATE OF DEATH June 25, 1995
Place of death Wilchenreuth, municipality of Theisseil , Upper Palatinate