Waloddi weibull biography of donald

  • Dr. Weibull was a
      • Waloddi weibull biography of donald


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    Accelerated Test / Parameter as Function of Engineering Variable (PFEV) / Degradation / Covariate Data Analysis

    There are lots of names for this kind of post-test results analysis. They all refer to a changing solution model parameter as test conditions change. The resulting model for lifetime is often termed an `S/N` relationship (Stress vs. N time units of life capability). Accelerated testing generally consists of increasing some or all the significant stresses that control the length of product life. This is done for the purpose of producing the same end-of-life results as normal operating level stresses, but with shorter overall test times and lower cost. It is often difficult to increase stresses without also changing the physics of failure invalidating this kind of test for the stated purpose, unless test levels are held within an acceptable range. Even after a successful accelerated test (no significant failure mechanism change) the life data from higher loading must be correlated to life at normal load. Dr. Wayne Nelson, a leading authority on accelerated testing, refers to many such techniques in his Accelerated Testing book. One source for accelerated testing analysis isSuperSMITH(TM) Weibull software. S/N curves for the product can be easily estimated

    I thoroughly enjoyed working at the Lockheed-California Company Rye Canyon Research and Development Center, Saugus, California.

    One of my independent research and development reports was LR27399, "Correlation of Failure Analysis Data: Pitting Corrosion". I was assigned to work in the Life Sciences Bldg. Here below the Last.fm link is a copy of report LR27399, page 1.

    In this website, I use methods described in 1975 report LR27399 to present an application of my Weibull Trending Toolkit(WTT). Files updated in July 2003 are: wtt01.html, wtt02.html, and wtt03.html

    Updated references are:
    wtt01.html
    wtt02.html
    wtt03.html

    Waloddi Weibull

    Ernst Hjalmar Waloddi Weibull (, Vittskövle – , Annecy) est un ingénieur et mathématiciensuédois. Il est reconnu pour ses travaux sur la fatigue des matériaux et, en statistique, pour ses études sur la distribution de Weibull.

    Biographie

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    Waloddi Weibull compte dans sa famille plusieurs cousins historiens connus comme Curt Weibull.

    Il s'engage en 1904 dans la marine suédoise en suivant parallèlement des cours à l'Institut royal de technologie à Stockholm. En 1924, il devient professeur et obtient huit ans plus tard son doctorat à l'université d'Uppsala. Il est employé dans différentes sociétés suédoises ou allemandes comme chercheur (roulements à billes et à rouleaux, marteau-piqueur) et ingénieur consultant.

    En 1939, il publie ses travaux sur la distribution de Weibull, utilisée en probabilité et statistique. Puis en 1941, il est nommé professeur de physique appliquée à l'Institut royal de Stockholm, grâce à la société de fabrique d'armes Bofors. Il publie de nombreux travaux sur la résistance des matériaux.

    En 1947, il part en expédition sur l' Albatros, un navire de recherche, dans les mers Méditerranée, des Caraïbes et dans l'océan Pacifique. Il écrit son premier article sur la propagation des ondes explosives. Il développe une technique basée sur l'explosion de charges pour caractériser la nature et l'épaisseur des fonds marins, technique encore utilisée aujourd'hui dans l'exploration pétrolière offshore.

    En 1951, il présente sa plus célèbre étude devant l' American Society of Mechanical Engineers, à partir de sept études de cas.

    Ses travaux seront récompensés par la médaille d'or de l'ASME en 1972 et par la grande médaille d'or de l'Académie royale des sciences de Suède en 1978 pour l'ensemble de son travail (plus de 70 publications).

    Waloddi Weibull meurt le à Annecy.

    Article scientifique

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    Notes et références

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    1. ↑Jules Ro
  • Ernst Hjalmar Waloddi Weibull

    • Waloddi Weibull


    Professor Weibull's proudest moment came in 1978 when he received the Great Gold Medal from the Royal Swedish Academy of Engineering Sciences which was personally presented to him by King Carl XVI Gustav of Sweden.


    He was devoted to his family and was proud of his nine children and numerous grand- and great-grandchildren. Dr. Weibull was a member of many distinguished Swedish Academies and Societies and worked to the last day of his remarkable life. He died on October 12, 1979, in Annecy, France.


    During June 1996, I asked Walter J. Trapp to help me in writing to Mrs. Inga Britta (Ibbi) Weibull. I remembered Walter telling me about Waloddi Weibull having received an award from King Gustav of Sweden, and I wished to include an image of the event in this tribute.

    Tribute to Waloddi Weibull

    Page created on 8/7/2006 12:00:00 AM

    Last edited 8/7/2006 12:00:00 AM

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