Download e-book for iPad: Active Control of Structures by Andre Preumont, Kazuto Seto

By Andre Preumont, Kazuto Seto

ISBN-10: 0470033932

ISBN-13: 9780470033937

With lively keep watch over of buildings , worldwide pioneers current the state of the art within the concept, layout and alertness of energetic vibration keep watch over. because the call for for top functionality structural structures raises, so will the call for for info and innovation in structural vibration regulate; this ebook presents a good treatise of the topic that might meet this requirement. The authors introduce energetic vibration keep an eye on by utilizing clever fabrics and buildings, semi-active keep an eye on units and various suggestions suggestions; they then speak about themes together with tools and units in civil buildings, modal research, lively keep an eye on of high-rise constructions and bridge towers, lively tendon keep an eye on of cable buildings, and lively and semi-active isolation in mechanical constructions.

lively keep an eye on of buildings:

  • Discusses new different types of vibration regulate equipment and units, together with the newly built reduced-order actual modelling strategy for structural regulate;
  • Introduces triple high-rise structures attached by way of energetic regulate bridges as devised by means of Professor Seto;
  • Offers a layout technique from modelling to controller layout for versatile buildings;
  • Makes prolific use of useful examples and figures to explain the themes and expertise in an intelligible demeanour.

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In this way, the phase diagram is always contained between 0 and −180◦ , as a consequence of the interlacing property. For the same reason, the Nyquist diagram consists of a set of near-circles (one per mode), all contained in the third and fourth quadrants. Thus, the entire curve G(ω) is below the real axis (the diameter of every circle is proportional to ξi−1 ). 1 Transmission Zeros and Constrained System We now establish that the transmission zeros of the undamped system are the poles (natural frequencies) of the constrained system.

63), that is, the eigenvalues of the constrained system. The fact that the eigenvalues are purely imaginary, s = ± jω0 , stems from the fact that K and M are symmetric and positive semi-definite. 17. As for the lead controller, for well-separated modes, those which are far enough from the origin can be analyzed independently of each other. 17 Collocated control system. (a) Root locus for a lead controller. 92) in the vicinity of mode i. 3 Positive Position Feedback There are frequent situations where the open-loop FRF does not exhibit a roll-off of −40 dB/decade as above.

G´eradin and Rixen, 1997) ωl = 2 π (2l − 1) k sin , m 2 (2n + 1) l = 1, . . 142) where n is the number of stories. 143) where g is the scalar gain and h(s) is the scalar control law, common to all the loops. 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 .

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Active Control of Structures by Andre Preumont, Kazuto Seto

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