Download PDF by Andre Preumont, Kazuto Seto: Active Control of Structures

By Andre Preumont, Kazuto Seto

ISBN-10: 0470033932

ISBN-13: 9780470033937

With lively keep an eye on of buildings , worldwide pioneers current the cutting-edge within the thought, layout and alertness of lively vibration keep an eye on. because the call for for top functionality structural platforms raises, so will the call for for info and innovation in structural vibration regulate; this ebook offers a good treatise of the topic that would meet this requirement. The authors introduce energetic vibration regulate by using clever fabrics and constructions, semi-active regulate units and quite a few suggestions concepts; they then talk about themes together with tools and units in civil constructions, modal research, lively regulate of high-rise structures and bridge towers, lively tendon keep an eye on of cable buildings, and energetic and semi-active isolation in mechanical buildings.

energetic regulate of buildings:

  • Discusses new kinds of vibration regulate equipment and units, together with the newly constructed reduced-order actual modelling process for structural keep an eye on;
  • Introduces triple high-rise constructions hooked up through energetic regulate bridges as devised by way of Professor Seto;
  • Offers a layout process from modelling to controller layout for versatile buildings;
  • Makes prolific use of sensible examples and figures to explain the subjects and know-how in an intelligible demeanour.

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Example text

The abscissa is the sensor location, and the ordinate is the frequency of the transmission zero value, is called a pole/zero flipping. Similarly, z3 flips with ω4 for s = l/4, z2 flips with ω3 for s = l/3, and z1 flips with ω2 for s = l/2. 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.

28(a). Every actuator ui applies a pair of forces equal and opposite between floor i and floor i − 1, while the sensor yi = xi − xi−1 measures the relative displacement between the same floors. The mass, OTE/SPH JWBK269-01 OTE/SPH September 26, 2008 13:57 Printer Name: Yet to Come 50 Active Damping stiffness and B matrices are respectively M = mI7 , ⎛ 2 −1 ⎜ −1 2 ⎜ ⎜ 0 −1 K =k⎜ ⎜ ⎜ ⎝ 0 0 0 ... 0 −1 2 ... −1 0 ... ... 2 −1 0 0 0 ⎞ ⎟ ⎟ ⎟ ⎟, ⎟ ⎟ −1 ⎠ 1 ⎛ ⎞ 1 −1 ⎜0 1 ⎟ ⎜ ⎟ ⎜0 0 ⎟ ⎜ ⎟ B=⎜. ⎟ . ⎜ ..

26 Duality between the IFF and the lead (DVF) control configurations. (a) IFF architecture with displacement actuator, force sensor and positive integral force feedback. (b) Force actuator and collocated displacement transducer and (negative) lead controller (DVF is a particular case). (c) IFF control: root locus for a single mode. (d) Lead control: root p. 27 (a),(b) Effect of a lag compensator on the loop size of an IFF control. 27(b). Note, however, that the widening of the loop occurs only if the loop goes from the pole jωi to a zero j zi at a lower frequency; otherwise, the effect is reversed.

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Active Control of Structures by Andre Preumont, Kazuto Seto

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