Class #16 - Introduction to Structural Control

Engineering Applications of Correlation and Spectral Analysis, 2nd Edition

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1 CEE619 Advanced Structural Dynamics and Smart Structures University of Michigan April 2, 2007 Prof. J. P. Lynch Introduction to Structural Control System Technology CEE619 Advanced Dynamics and Smart Structures: April 2, 2007 Prof. J. P. Lynch University of Michigan CEE619 Advanced Structural Dynamics and Smart Structures University of Michigan April 2, 2007 Prof. J. P. Lynch What is Structural Control? • Mechanical system employed to reduce structural vibrations 9 Control device 9 Control algorithms • Enhance the safety and habitability of structures • Interested in numerous sources of vibration 9 Winds (Strong gusts and typhoons) 9 Earthquakes (Weak and strong) 9 Machinery • Types of structural control 9 Passive (Very common approach to control) 9 Active 9 Semi-Active
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2 CEE619 Advanced Structural Dynamics and Smart Structures University of Michigan April 2, 2007 Prof. J. P. Lynch Concept of Semi- and Active Control • Two approaches to the employment of active and semi- active structural control systems: 9 Feed-back control (most common) 9 Feed-forward control (least common) CEE619 Advanced Structural Dynamics and Smart Structures University of Michigan April 2, 2007 Prof. J. P. Lynch Passive Structural Control • Tend to be very simple systems • Requires no external power to operate 9 Simply impart forces which are developed in response to structure’s motion 9 Relatively inexpensive solution to reducing structural vibrations • Usually compact and non-invasive to architectural spaces • Limits exist on the amount of control attainable
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3 CEE619 Advanced Structural Dynamics and Smart Structures University of Michigan April 2, 2007 Prof. J. P. Lynch Passive Control Device Types •V i s c o e l a s t i cD am p e r s : 9 Contains a viscoelastic polymer sandwiched between two metal plates.
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4 CEE619 Advanced Structural Dynamics and Smart Structures University of Michigan April 2, 2007 Prof. J. P. Lynch Base Isolation Systems • A lead-rubber bearing is made from layers of rubber sandwiched together with layers of steel. • In the middle of the bearing is a solid lead "plug." On top
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Class #16 - Introduction to Structural Control -...

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