By A. Preumont
This textual content is an creation to the dynamics of lively buildings and to the suggestions keep an eye on of calmly damped versatile constructions; the emphasis is put on easy concerns and straightforward keep watch over innovations that work.
Now in its 3rd variation, extra chapters were additional, and reviews and suggestions from readers were taken under consideration, whereas whilst the original premise of bridging the distance among constitution and regulate has remained. Many examples and difficulties carry the topic to existence and take the viewers from thought to practice.
The publication has chapters facing a few ideas in structural dynamics; electromagnetic and piezoelectric transducers; piezoelectric beam, plate and truss; passive damping with piezoelectric transducers; collocated as opposed to non-collocated regulate; lively damping with collocated platforms; vibration isolation; kingdom house process; research and synthesis within the frequency area; optimum keep watch over; controllability and observability; balance; functions; tendon keep watch over of cable buildings; energetic keep watch over of huge telescopes; and semi-active keep an eye on. The publication concludes with an exhaustive bibliography and index.
This ebook is meant for structural engineers who are looking to collect a few history in vibration keep watch over; it may be used as a textbook for a graduate path on vibration keep watch over or lively constructions.
A ideas guide is accessible during the writer to lecturers utilizing this booklet as a textbook.
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Extra info for Vibration Control of Active Structures: An Introduction Third Edition
Such that ωk ωb ) to G(ω) can be evaluated by assuming Dk (ω) 1. 20) This approximation is valid for ω < ωm . The ﬁrst term in the right hand side is the contribution of all the modes which respond dynamically and the second term is a quasi-static correction for the high frequency modes. Taking into account that n G(0) = K −1 = i=1 1 φi φTi μi ωi2 Qi = 1/2ξi is often called the quality factor of mode i. b ! k ! Fig. 2 Fourier spectrum of the excitation F with a limited frequency content ω < ωb and dynamic ampliﬁcation Di of mode i such that ωi < ωb and ωk ωb .
F. on which the control system acts. We know from control theory that the open-loop zeros are asymptotic values of the closed-loop poles, when the feedback gain goes to inﬁnity. f. where the constraint has been added (this is indeed well known in control theory that the open-loop poles are independent of the actuator and sensor conﬁguration while the open-loop zeros do depend on it). However, from the foregoing discussion, for every actuator/sensor conﬁguration, there will be one and only one zero between two consecutive poles, and the interlacing property applies for any location of the collocated pair.
20) This approximation is valid for ω < ωm . The ﬁrst term in the right hand side is the contribution of all the modes which respond dynamically and the second term is a quasi-static correction for the high frequency modes. Taking into account that n G(0) = K −1 = i=1 1 φi φTi μi ωi2 Qi = 1/2ξi is often called the quality factor of mode i. b ! k ! Fig. 2 Fourier spectrum of the excitation F with a limited frequency content ω < ωb and dynamic ampliﬁcation Di of mode i such that ωi < ωb and ωk ωb .