By T. T. Soong
Energetic structural keep an eye on capacity making constructions aware of exterior forces like earthquakes and hurricanes. Large-scale experimentation is now occurring during this box and this publication brings jointly a wealth of knowledge at the perform and thought of lively structural keep watch over. in addition to documenting the latest advances within the box, the ebook additionally seems on the fast improvement in allied applied sciences reminiscent of electronics, fabrics and dimension concepts, that have fuelled the expansion of this quarter.
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Additional info for Active Structural Control: Theory and Practice (Longman structural engineering & structural mechanics series)
21. They indicate that instantaneous optimal control algorithms are slightly more efficient than the classical closed-loop control. We note that all three instantaneous optimal control algorithms would produce identical results under the same simulated conditions. A comparison of the required control forces is given in Fig. 22. 3. 4 Independent Modal Space Control (IMSC) As the name implies. control system design based on IMSC takes place in the modal space. To facilitate discussions, let us depart temporarily from the state-space representation and return to the traditional configuration space for this development.
25 Schematic representation of a pulse train 29 5! : ... _ _ _ _ _ _ _ _ _ _ __, Yes Hold data for Calculate p(t;) . 87) Control algorithms In the above, m. and k are the natural frequency and the stiffness of the ZP and Z EF define the contributions system, respectively, Coefficients z,, to the response of the displacement, velocity, pulse at time t, and of the forcing function, respectively. More general expressions for these coefficients for a damped system can be similarly derived. In most cases, the forcing function in the interval (t;.
1. 3 Consider a two-storey structure similar to that shown in Fig. 8. The state-space equation is of the form given by Eq. 1) where A is a 4 x 4 matrix. 01 These numerical values are chosen to characterize a lightly damped system. Units for all physical quantities will not be specified since only comparative studies are performed here. ,.. 2 The uncontrolled two-storey structural system is assumed to be described by i(t) = Az(t) + hf(t) where 0 h= 0 and f(t) = 3 sin wt + 5 sin 2wt + 7 sin 3wt + 4 sin 4wt which is a crude representation of a wind-type excitation acting on both floors.
Active Structural Control: Theory and Practice (Longman structural engineering & structural mechanics series) by T. T. Soong