By Andre Preumont, Kazuto Seto
With energetic keep an eye on of constructions , international pioneers current the cutting-edge within the thought, layout and alertness of energetic vibration keep an eye on. because the call for for prime functionality structural platforms raises, so will the call for for info and innovation in structural vibration keep an eye on; this ebook offers an efficient treatise of the topic that might meet this requirement. The authors introduce lively vibration keep watch over by using shrewdpermanent fabrics and constructions, semi-active regulate units and numerous suggestions innovations; they then talk about issues together with equipment and units in civil buildings, modal research, lively keep an eye on of high-rise structures 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 different types of vibration keep watch over tools and units, together with the newly built reduced-order actual modelling procedure for structural keep watch over;
- Introduces triple high-rise structures attached by means of energetic keep watch over bridges as devised through Professor Seto;
- Offers a layout procedure from modelling to controller layout for versatile constructions;
- Makes prolific use of sensible examples and figures to explain the themes and know-how in an intelligible demeanour.
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Extra resources for Active Control of Structures
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. 5. 145) OTE/SPH JWBK269-01 OTE/SPH September 26, 2008 13:57 Printer Name: Yet to Come 52 Active Damping (open-loop poles) and for g −→ ∞ (transmission zeros); for 0 < g < ∞, the plots depend on the control law.
F. along the actuator blocked ( = 0). Note that these are larger than the open-loop poles in the IFF case, because the stiffness is infinite in this case. 26(c) is fixed, and with it the maximum damping. 27. 27. 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.
However, guaranteed stability does not mean guaranteed performance; good performance does require information on the system as well as on the disturbance applied to it, for appropriate actuator/sensor placement, actuator sizing, sensor selection and controller tuning. Actuator placement means good controllability of the dominant modes; this will be reflected by well-separated poles and zeros, leading to wide loops in the root-locus plots. In order to keep the formal complexity to a minimum, we will assume no structural damping and perfect actuator and sensor dynamics throughout most of this section.