By Andre Preumont, Kazuto Seto
With lively keep watch over of constructions , worldwide pioneers current the state of the art within the conception, layout and alertness of energetic vibration regulate. because the call for for prime functionality structural platforms raises, so will the call for for info and innovation in structural vibration keep watch over; this ebook presents an efficient treatise of the topic that would meet this requirement. The authors introduce energetic vibration keep watch over by utilizing clever fabrics and constructions, semi-active regulate units and quite a few suggestions strategies; they then talk about subject matters together with tools and units in civil constructions, modal research, energetic keep watch over of high-rise constructions and bridge towers, energetic tendon keep watch over of cable buildings, and lively and semi-active isolation in mechanical constructions.
energetic keep watch over of constructions:
- Discusses new kinds of vibration regulate equipment and units, together with the newly built reduced-order actual modelling strategy for structural regulate;
- Introduces triple high-rise constructions hooked up by way of lively keep watch over bridges as devised via Professor Seto;
- Offers a layout method from modelling to controller layout for versatile constructions;
- Makes prolific use of sensible examples and figures to explain the subjects and expertise in an intelligible demeanour.
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Additional info for Active Control of Structures
Examining the mode shapes, one notices that the pole/zero flipping always occurs at a node of the mode shapes, and this corresponds to a change of sign in φi (a )φi (s), as discussed above. This simple example illustrates the behavior of the pole/zero pattern for nearly collocated control systems: the poles and zeros are still interlacing at low frequency, but not at higher frequency, and the frequency where the interlacing stops decreases as the distance between the actuator and sensor increases.
117) are the fraction of modal strain energy; they are all positive, and this guarantees, once again, interlacing poles and zeros. 22 Open-loop FRF of an active truss. 5, the important difference is that the zero z1 has a frequency lower than ω1 . 108). 119) y = K a (bT x − δ). 121) (the K a in the denominator is for normalization purposes; y/K a is the elastic extension of the strut). 23. 24. It consists of interlacing pole/zero pairs on the imaginary axis (z1 < ω1 < z2 < ω2 < . ) and the pole at s = 0 from the controller.
95) Note that it is independent of the structural damping in the system. Since the instability occurs for large gains which are not used in practice, the PPF can be regarded as unconditionally stable. Unlike the lead controller of the previous section which controls all the modes which belong to z < ωi < p and even beyond, the PPF filter must be tuned on the targeted mode (it is therefore essential to know the natural frequency accurately), and the OTE/SPH OTE/SPH JWBK269-01 September 26, 2008 13:57 Printer Name: Yet to Come 34 Active Damping authority on the modes with very different frequencies is substantially reduced.
Active Control of Structures by Andre Preumont, Kazuto Seto