An effective inverse analysis computer program that integrates nonlinear optimization algorithm and forward dynamic analysis of multilayered medium is developed for inferring structural and material properties (e.g., modulus, thickness, and the number of layers) of the medium. Using dynamic deflection information obtained from forward dynamic analysis of the multilayered medium as a hypothetical deflection measured from the field during pavement nondestructive evaluation (NDE) using falling weight deflectometer, the estimated parameters of the medium are compared with the known true parameters of the medium used to perform the static and forward dynamic analyses. Based on two different multilayered media, a number of important observations and conclusions are made regarding the accuracy and efficiency of the proposed numerical algorithms and developed computer program. The inversion methods presented in this paper show improved NDE results over many of the existing algorithms.

Issue Section:
Research Papers
Keywords:
elasticity, elastodynamics, inverse problems, nondestructive testing, system monitoring, multilayered medium, elasticity, seismic inverse problem, nonlinear optimization, numerical analysis
Topics:
Algorithms, Computation, Computer software, Deflection, Dynamic analysis, Elasticity, Inverse problems, Nondestructive evaluation, Optimization, Pavement, Surface waves (Fluid), Numerical analysis, Optimization algorithms, Stress, Sensors, Weight (Mass)
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 by American Society of Mechanical Engineers
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