By Andre Preumont, Kazuto Seto
With energetic keep an eye on of constructions , worldwide pioneers current the state of the art within the conception, layout and alertness of lively vibration regulate. because the call for for top functionality structural structures raises, so will the call for for info and innovation in structural vibration keep watch over; this ebook presents a good treatise of the topic that might meet this requirement. The authors introduce lively vibration keep an eye on by using clever fabrics and constructions, semi-active keep watch over units and various suggestions strategies; they then speak about subject matters together with tools and units in civil constructions, modal research, lively keep an eye on of high-rise constructions and bridge towers, lively tendon keep an eye on of cable constructions, and lively and semi-active isolation in mechanical buildings.
energetic keep an eye on of buildings:
- Discusses new forms of vibration keep watch over tools and units, together with the newly constructed reduced-order actual modelling process for structural keep watch over;
- Introduces triple high-rise constructions attached by means of lively regulate bridges as devised via Professor Seto;
- Offers a layout approach from modelling to controller layout for versatile constructions;
- Makes prolific use of useful examples and figures to explain the themes and expertise in an intelligible demeanour.
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Extra resources for Active Control of Structures
111), 12 μi ωi2 is the total modal strain energy, OTE/SPH JWBK269-01 OTE/SPH September 26, 2008 13:57 Printer Name: Yet to Come Active Damping with Collocated System 39 in the whole structure, for the same mode. We define the fraction of modal strain energy: νi = (bT φi )2 K a = μi ωi2 Strain energy in the strut . 116) With this definition, the open-loop transfer function can be rewritten G(s) = K a ga n νi 2 2 i=1 s /ωi +1 −1 . 117) The contribution of the high-frequency modes can be truncated and replaced by a quasi-static contribution as we did earlier, leading to m G(s) K a ga i=1 n νi νi − 1 .
We will soon examine the case of a truss involving several active struts controlled in a decentralized manner. 26 illustrates the duality between the IFF and the lead controllers. 26(c)–(d)). 26(c)). Open-loop poles and zeros For the IFF, the open-loop poles jωi are the natural frequencies of the structure with the active element working passively (contributing with its own stiffness K a ), while the open-loop zeros, j zi , are the natural frequencies when the force f in the active strut is zero, that is, when the active element is removed.
According to the foregoing discussion, the transmission zeros are the natural frequencies of the system obtained by constraining (blocking) the first two floors. 142) can therefore be used to evaluate the zeros as well, after setting the number of stories to n − 2. 31 shows the root locus for a positive position feedback as in Høgsberg and Krenk (2006), h(s) = −1 . 144) was chosen very close to the origin and the pole very far on the negative real axis, so that the lead compensator behaves as a DVF.
Active Control of Structures by Andre Preumont, Kazuto Seto