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

By H. G. Natke (eds.)

System id is a robust software in engineering. Its a variety of tools within the frequency and within the time area were widely mentioned in previous CISM classes. the purpose of this path is to explain the cutting-edge in particular program components, comparable to estimation of eigenquantities (in the aerospace undefined, in civil engineering, in naval engineering etc.), noise resource detection, fault detection by means of research of dynamic houses, akin to laptop sound features, and the identity of the dynamic behaviour of move brought on platforms (e.g. aerolastic problems). Geotechnical functions also are one of the fields of curiosity. The lecture notes comprise demonstrations of numerous equipment and contain a valuation by way of combining several types of adventure. Such complicated details contains not just theoretical elements of id but additionally suggestion on sensible dealing with, for instance relating checking out attempt and information handling.

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An electromagnetic (electrodynamic) driver unit and a power valve or hydraulic amplifier are used. Depending on the power capacity of the system, large forces and large velocities of motion can be generated, made possible with a large stroke. 1 0/). Since the weight of a hydraulic vibrator is small relative to the forces attainable, a heavy reaction mass or support is necessary if such a vibratory force is to be introduced in Introduction 43 a large structure. This may be a complicating factor when large, fixed structures have to be exci ted.

In spite of these difficulties the low frequency suspension of such test structures seems to be more advantageaus for simulating boundary conditions than "rigid" fixtures, which are sometimes used when etructures or etructural componente (eubetructures) are teeted on a shaker table. Really rigid fixturee can never be obtained in practice, but cauee interactione between test eetup and test structure, which then have to be taken into account in the mathematical model. g. )) are not available or ineufficient for dynamic teste of the structure under inveetigation, the test structure hae to be excited by a euitably chosen test device.

The advantage of this formulation is that it includes the prior knowledge, that missing test data can be replaced by prior knowledge, and that it can be used as a parameter perturbation method for solving the problem iteratively. In the case where the method is nonlinear in the parameters to be estimated, the perturbation is done by choosing the weighting matrices parametrically and by using the previous solution as starting values for the next iteration. The maximum likelihood estimation and its classification remains to be discussed.

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