On vibration testing of a large structure, such as aerospace structures, it is difficult to handle the whole structure as an entire system. An alternate approach, substructure testing, is considered. In this method, one of the problems is truncation error, which is the subject of this investigation. As the characteristics of substructures are represented by the lower vibration modes, an error due to truncated higher modes is inherent. In order to reduce the error, numerous component modes are required in the modeling stage, especially when the substructures are strongly coupled with each other in the system. This means that the vibration testing must cover very high frequencies and that a great number of vibration modes must be identified. Such testing is so laborious and error prone that a more effective contrivance is desired. Attaching auxiliary weights to the points which are to be the junction with other substructures, known as 'mass loading', is suitable for the purpose. The effects of mass, having both translating and rotating inertia, were examined by the numerical analysis of flexural vibration of beams. The technique was applied successfully to experiments on a satellite model.
A study on truncation error in substructure testing
Eine Untersuchung zu Trennungsfehlern bei Pruefungen von Unterstrukturen
IMAC 3. Proc. of the 3rd Int. Modal Analysis Conf., Union College-Schenectady ; 2 , Jan ; 1220-1226
1985
7 Seiten, 8 Bilder, 5 Quellen
Conference paper
English
Modal Truncation Vectors for Reduced Dynamic Substructure Models
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