Lothar Cremer

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License to operate a business
The company sign at the time

Lothar Cremer (born August 16, 1905 in Munich ; † October 16, 1990 in Miesbach ) was a German electrical engineer and acoustician. Cremer wrote several books on the subject of acoustics and is considered one of the leading scientists of the 20th century in the field of technical acoustics. Since 1992, the young talent award of the German Society for Acoustics has been named the Lothar Cremer Prize in his honor .

Life

Lothar Cremer was born in Munich, the son of Max Cremer , professor of physiology at the University of Munich, and mother Elisabeth, née. Rothmund, born. He had a brother Hubert Cremer (1897–1983) eight years older and a sister Erika Cremer (1900–1996) five years older . Hubert Cremer later became a full professor of mathematics at the TH Aachen and his sister professor of physical chemistry at the University of Innsbruck . When Cremer was six years old, the family moved to Berlin. His father became a professor at the university there. At the end of the war, Cremer and his family moved to Sielenbach .

Cremer played the viola very well and was tutored by the virtuoso Oskar Sala , Trautonium . When choosing a career, he wavered between a professional musician and an engineer . That is why he worked temporarily at AEG after graduating from high school and then decided to study electrical engineering . In 1938 Cremer married in Freiburg Cathedral . The marriage produced three children: Cordula, Michael and Andreas. Michael became a professor like his father.

In 1930 he passed the diploma examination in electrical engineering at the Technical University of Berlin. His diploma thesis on the theory of the frequency dependence of an AC circuit with a DC device and dry rectifier was supervised by Franz Heinrich Ollendorff . In 1933 he completed his doctorate under Carl Ramsauer and Erwin Meyer on the theory of sound absorption in porous walls. In 1940 he completed his habilitation at the TH Berlin .

In 1946, Lothar Cremer received the approval and license from the American occupying power to operate a business as a consulting engineer for sound technology in building construction in Munich. Today the company operates under the name Müller-BBM . It was taken over in 1958 by Cremer's student Helmut A. Müller (1930–2015) and took on other partners in 1962, including Cremer's student Manfred Heckl and Leo Beranek (von Bolt, Beranek and Newman, BBN).

From 1949 he taught in Munich at the Ludwig Maximilians University and the Technical University . In 1951 he became an adjunct professor. During his time in Munich, Cremer worked for the first time in the construction of a large concert hall, the former throne room in the destroyed Munich residence . This room - now known as the Hercules Hall because of the Flemish tapestries with the deeds of Hercules - can hold 1200 people and was the first to have free-hanging reflectors .

In 1954, Cremer was appointed to the TU Berlin , where he became full professor and director of the newly founded Institute for Technical Acoustics (ITA). In 1960 he also became director of the Heinrich Hertz Institute . In 1970 he was elected a full member of the Göttingen Academy of Sciences . In 1972 he retired .

In 1974 Crember received the Wallace Clement Sabine Medal and in 1989 the Gold Medal from the Acoustical Society of America .

Lothar Cremer was buried in the forest cemetery in Miesbach .

Fonts

  • The scientific foundations of room acoustics. Volume 1: Geometric room acoustics.
  • with Helmut A. Müller: The scientific foundations of room acoustics. Volume 1: Wave theory room acoustics. Volume 2: Statistical room acoustics.
  • The scientific foundations of room acoustics. Volume III: Wave theory and room acoustics. Physics and Technology of the Present.
  • Physics of the violin. Hirzel, Stuttgart.

literature

  • Festive colloquium on Prof. Lothar Cremer's 100th birthday. ITA TU Berlin, November 25, 2005.

Web links

Individual evidence

  1. Holger Krahnke: The members of the Academy of Sciences in Göttingen 1751-2001 (= Treatises of the Academy of Sciences in Göttingen, Philological-Historical Class. Volume 3, Vol. 246 = Treatises of the Academy of Sciences in Göttingen, Mathematical-Physical Class. Episode 3, vol. 50). Vandenhoeck & Ruprecht, Göttingen 2001, ISBN 3-525-82516-1 , p. 62.