By Andre Preumont, Kazuto Seto
With energetic keep watch over of buildings , worldwide pioneers current the cutting-edge within the concept, layout and alertness of energetic vibration regulate. because the call for for prime functionality structural structures raises, so will the call for for info and innovation in structural vibration regulate; this booklet offers an efficient treatise of the topic that might meet this requirement. The authors introduce lively vibration keep watch over by utilizing clever fabrics and constructions, semi-active regulate units and a number of suggestions ideas; they then talk about subject matters together with equipment and units in civil constructions, modal research, energetic keep watch over of high-rise constructions and bridge towers, energetic tendon regulate of cable buildings, and energetic and semi-active isolation in mechanical constructions.
energetic keep watch over of buildings:
- Discusses new sorts of vibration regulate equipment and units, together with the newly constructed reduced-order actual modelling process for structural regulate;
- Introduces triple high-rise structures hooked up by means of lively regulate bridges as devised by way of Professor Seto;
- Offers a layout technique 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
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. beams or plates covered with collocated piezoelectric patches, piezoelectric truss). 18 Block diagram of the second-order PPF controller applied to a structure with collocated actuator and sensor (the open-loop transfer function has the same number of poles and zeros) In these situations, the degree of the numerator of G(s) is the same as that of the denominator and the open-loop pole/zero pattern has an additional pair of zeros at high frequency.
72) − is Thus, if the two residues have the same sign, the sign of G(ω) near ωi+1 + opposite to that near ωi . By continuity, G(ω) must vanish somewhere − . 70) are not all positive, there is no guarantee that G(ω) is an increasing function of ω, and one can find situations where there is more than one zero between two neighboring poles. 3 Non-Collocated Control Systems Since the low-frequency modes vary slowly in space, the sign of φi (a )φi (s) tends to be positive for low-frequency modes when the actuator and sensor are close to each other, and the interlacing of the poles and zeros is maintained at low frequency.
14 Open-loop pole/zero pattern and root locus of the lead compensator applied to a structure with collocated actuator/sensor (open-loop transfer function with two more poles than zeros). 15 Block diagram of the lead compensator applied to a structure with collocated actuator/sensor (open-loop transfer function G(s) with two more poles than zeros) roll-off rate s −2 (a feedthrough component would introduce an additional pair of zeros). This system can be damped with a lead compensator: H(s) = g s+z s+p (p z).