Application of System Identification in Engineering by H. G. Natke (eds.)

By H. G. Natke (eds.)

System identity is a strong device in engineering. Its quite a few equipment within the frequency and within the time area were generally mentioned in prior CISM classes. the purpose of this path is to explain the state-of-the-art in particular software parts, resembling estimation of eigenquantities (in the aerospace undefined, in civil engineering, in naval engineering etc.), noise resource detection, fault detection via research of dynamic homes, similar to computer sound features, and the id of the dynamic behaviour of move triggered structures (e.g. aerolastic problems). Geotechnical functions also are one of the fields of curiosity. The lecture notes include demonstrations of numerous equipment and contain a valuation by way of combining several types of event. Such complicated details contains not just theoretical elements of identity but in addition suggestion on useful dealing with, for instance pertaining to trying out attempt and knowledge handling.

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By H. G. Natke (eds.)

System identity is a strong device in engineering. Its quite a few equipment within the frequency and within the time area were generally mentioned in prior CISM classes. the purpose of this path is to explain the state-of-the-art in particular software parts, resembling estimation of eigenquantities (in the aerospace undefined, in civil engineering, in naval engineering etc.), noise resource detection, fault detection via research of dynamic homes, similar to computer sound features, and the id of the dynamic behaviour of move triggered structures (e.g. aerolastic problems). Geotechnical functions also are one of the fields of curiosity. The lecture notes include demonstrations of numerous equipment and contain a valuation by way of combining several types of event. Such complicated details contains not just theoretical elements of identity but in addition suggestion on useful dealing with, for instance pertaining to trying out attempt and knowledge handling.

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Extra resources for Application of System Identification in Engineering

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The advantages and disadvantages of slow sine e%- citation are therefore almost the same as for stepped sine e%citation, tion e%cept for the shorter duration of the vibra- test. By applying a fast sine sweep (chirp, Fig. 2), the sweep rate e%ceeds the quasi-steady stete condition. In order to avoid leakage errors when analyzing the system response with a usual digital Fourier-analyzer, the fast sine sweep is made periodic in the analyzer window (periodic chirp}. 13/. G. Natke- N. Cottin characterizing structural non-linearities, good signal-tonoise ratio, controlled bandwidth.

3/. 3/· On the other band, it can be difficult to simulate the correct boundary conditions during the dynamic identification test, for instance in the aircraft and spacecraft industry when ground-based teste {"ground vibration testing") have to simulate flight environments. A frequent method of conducting such vibration teste on aircraft under "free" boundary conditions is to suspend them in a low-frequency support system comprised of long cables and/ or soft mechanical or air springe. G. Natke- N.

Natke - N. Cottin ment methods, an approximation is made by partitioning the source surface into a finite number of plan~r surface elements (chosen, for example, so that the velocity and pressure is distributed uniformly over the elements). The result is a system of linear inhomogeneous equations. 4 Test model The definition of the test model is contained in Fig. 5. The test planning in general takes into consideration the a priori knowledge of system analysis and experience with comparable structures.

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