By T. T. Soong
Lively structural keep watch over capacity making constructions aware of exterior forces like earthquakes and hurricanes. Large-scale experimentation is now happening during this box and this booklet brings jointly a wealth of knowledge at the perform and thought of lively structural keep watch over. in addition to documenting the newest advances within the box, the publication additionally seems to be on the quick improvement in allied applied sciences similar to electronics, fabrics and dimension concepts, that have fuelled the expansion of this quarter.
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Additional resources for Active Structural Control: Theory and Practice (Longman structural engineering & structural mechanics series)
5 (a) passive mass damper; (b) classical closedloop control; (c) instantaneous optimal contro1 3 43 Actin~ structural control: theory and practice in which Q11 and Q22 arc 2 x 9 matrices. 0 is chosen for~ such that the top floor relative displacement is reduced by approximately 60%. i = I, ... , 8 and Qjj = 0, j=9, ... , 18. Without the active control force, the mass damper is passive. 2l(a), respectively. 21. They indicate that instantaneous optimal control algorithms are slightly more efficient than the classical closed-loop control.
18 - 20 The procedure essentially shifts the problem of control design from a coupled 2n-order structural system to n second-order systems, a considerably simpler problem with substantial savings in computational efforts. It is particularly attractive when only a few critical modes need to be controlled. The modal control forces v(t) can be determined by using any method of control. 78) Upon determination of the modal control forces, the physical controller forces can be synthesized subsequently via Eq.
Next, a procedure to determine the required pulse p(t 1), based only on the sensed system state at time t, and the system dynamic characteristics, is derived. The system response at time ti can be considered as a superposition of the contributions of the initial conditions at timet;. the pulse applied at timet, and the external forcing function during the time interval (t,, r j). 25 Schematic representation of a pulse train 29 5! : ... _ _ _ _ _ _ _ _ _ _ __, Yes Hold data for Calculate p(t;) .
Active Structural Control: Theory and Practice (Longman structural engineering & structural mechanics series) by T. T. Soong