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

By H. G. Natke (eds.)

ISBN-10: 3211820523

ISBN-13: 9783211820520

ISBN-10: 3709126282

ISBN-13: 9783709126288

System identity is a strong instrument in engineering. Its a variety of tools within the frequency and within the time area were largely mentioned in prior CISM classes. the purpose of this direction is to explain the cutting-edge in particular program components, resembling 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, equivalent to computing device sound features, and the id of the dynamic behaviour of stream triggered platforms (e.g. aerolastic problems). Geotechnical purposes also are one of the fields of curiosity. The lecture notes comprise demonstrations of a number of tools and contain a valuation via combining several types of event. Such advanced details comprises not just theoretical elements of identity but additionally recommendation on functional dealing with, for instance touching on checking out attempt and knowledge handling.

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15/. Pseudo-random signals are created in the frequency domain, usually with uniform amplitude and random phase throughout the desired frequency range. Fourier transformed into the time domain, the signal is transmitted to the exciter system through a digital-to-analog converter. This process of signal generation leads to an advantage of pseudo-random excitation: the excitation signal is always periodic within the sample window and therefore does not suffer from ·leakage errors. ,/. 5/: during the first input of pseudo-random excitation one has to wait for the transient system response to die out so that the steady-state response (and the correspond- Introduction 51 ing input) can be measured.

E. g. or displa- cement transducers for low-frequency vibration, where corresponding velocity or acceleration measurements yield an impractically small output, or acceleration measurements may be useful, where suitable displacement or velo- city pickups would be too large because of clearance requirements). The effect of added mass and the change in stiffness of the test structure must also be considered. 5/· the only correctable 55 Introducdon The main requirement for a tranducer mounting is to couple the transducer to the system under test so that the transducer accurately follows the motion of the surface to which it is attached.

15/. Pseudo-random signals are created in the frequency domain, usually with uniform amplitude and random phase throughout the desired frequency range. Fourier transformed into the time domain, the signal is transmitted to the exciter system through a digital-to-analog converter. This process of signal generation leads to an advantage of pseudo-random excitation: the excitation signal is always periodic within the sample window and therefore does not suffer from ·leakage errors. ,/. 5/: during the first input of pseudo-random excitation one has to wait for the transient system response to die out so that the steady-state response (and the correspond- Introduction 51 ing input) can be measured.

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


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