wave motion studies originated in iem liao zp (institute of engineering mechanics, csb) august 19...
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Wave Motion Studies Originated in IEM
Liao ZP(Institute of Engineering Mechanics, CSB)
August 19 2004
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Professor Liu Hui Xian
Initiating the studies in IEMGreat support to the studies
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Problem Statement
• Near-field wave motion
• Numerical Simulation
• Open, Complicated System of large scale
Remark: Common Problem
Fields in Electromagnetics
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Goal: High Efficiency Accuracy and Stability
Results:Finite Element Decoupling Technique
for Simulation of the Near-Field Wave Motion
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Framework of Decoupling Technique(1970s, 1980s)
Decoupling
• Waves passing through the boundary
• Wave Motion in the interior
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• Transmitting Boundary conditions Liao ZP, etc., Siencia Sinica, 27(10), 1063-1076, 1984;
Liao ZP, etc., Soil Dyn. Earthq. Eng., 3(1), 174-183,1984
• Decoupling Simulation of Waves
in the Interior of the SystemLumped Mass and Consistent MassLiao ZP , Earthq. Eng. Eng. Vib., 4(2), 1-14, 1984 (in Chinese)
• Framework of the decoupling technique
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Recent Studies (1990s - now)
Theoretical basis of the boundaryPlane wave assumption and Radiation conditions at infinity
Liao ZP, Sciences in China, 42(2), 177-186, 2001
Stable ImplementationSemi-empirical technique to enhance the stability
Classification of instabilities Causes Measures
Liao ZP, etc., Acta Geophysica sinica, 45(4), 554-568, 2002
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Complicated Waves in the Interior The technique is generalized to include:
Contactable Cracks
Plasticity, Viscosity and Elasticity
Constant Hysteretic Damping
Liu JB, etc., Acta Mechanica Sinica, 15(1), 63-72, 1999
Liu JB, etc, Comp. Meth. Appl. Mech. Eng., 121, 187-200, 1995
123, 287-298, 1995
Li XJ, etc., Acta Seismologica Sinica, 8(3), 447-456, 1995
Liao ZP, An Introduction to Wave Motion Theories for Engineering
Academic Press, Beijing ,2002 (in Chinese)
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Applications
Professor Chen HQ
Earthquake Resistance Design
Of Xiao-wan arch dam(192m)
I = Ⅷ,Ⅸ
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11A sketch of F.E. modeling of Xiaowan arch dam
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Concluding Remarks
Forward and Inverse Problems
Cooperation of Different Disciplines