Wave Motion Studies Originated in IEM Liao ZP (Institute of Engineering Mechanics, CSB) August 19...
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Transcript of Wave Motion Studies Originated in IEM Liao ZP (Institute of Engineering Mechanics, CSB) August 19...
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