Journal ArticleDOI
Parametric Identification of Structures with Nonlinearities Using Global and Substructure Approaches in the Time Domain
R. Kishore Kumar,K. Shankar +1 more
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In this paper, structural parametric identification of structures with non-linearities in stiffness and damping properties is carried out using acceleration responses in the time domain and is useful for structural health monitoring.Abstract:
This paper presents further research on the parametric identification of structures with non-linearities in stiffness and damping properties. Parametric identification is carried out using acceleration responses in the time domain and is useful for structural health monitoring. Cubic nonlinearities in springs and quadratic nonlinearities in dampers are considered. Structural parametric identification is modeled as an inverse problem, based on minimizing the difference between measured responses and calculated responses from a mathematical model. The results of both global and substructural identification approaches are compared. The substructural approach allows us to identify a smaller domain while ignoring external parameters, resulting in a reduced model, but on the other hand the formulation is more complex. Genetic algorithms (GA) are used for filtering the unknown parameter values from within a given range. Simple real coded GA as well as a superior hybrid version obtained by combining with the Leve...read more
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Journal ArticleDOI
A New Physical Parameter Identification Method for Two-Axis On-Road Vehicles: Simulation and Experiment
TL;DR: In this article, a new physical parameter identification method for two-axis on-road vehicle is presented, where the modal parameters of vehicle are identified by using the State Variable Method.
Journal ArticleDOI
Identification of Tall Shear Buildings under Unknown Seismic Excitation with Limited Output Measurements
TL;DR: In this paper, an algorithm based on the extended Kalman estimator approach is proposed for the identification of structural parameters and unknown excitation of tall shear-type buildings with only partial measurements of structural absolute acceleration responses.
Journal ArticleDOI
Damage Identification of Frame Structures with Joint Damage under Earthquake Excitation
TL;DR: In this article, an algorithm based on a two-step Kalman filter approach is presented for the damage detection of frame structures with joint damage under earthquake excitation using partial measurements of structural acceleration responses.
Journal ArticleDOI
Physical Parameter Identification Method Based on Modal Analysis for Two-axis On-road Vehicles: Theory and Simulation
TL;DR: In this paper, a methodology based on the State Variable Method (SVM) for physical parameter identification of two-axis on-road vehicle is presented, which can identify all physical parameters of 7-DOF vehicle model by using free-decay responses of vehicle without need to assume some physical parameters are known.
Journal ArticleDOI
Identification of time-varying nonlinear structural physical parameters by integrated WMA and UKF/UKF-UI
TL;DR: This paper proposes approaches to identify the time-varying physical parameters of nonlinear structures in three cases using only partially measured structural responses using an improved fading-factor unscented Kalman filter under unknown input and the WMA integrated with UKF-UI method.
References
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Journal ArticleDOI
Structural-System Identification. I: Theory
Roger Ghanem,Masanobu Shinozuka +1 more
TL;DR: In this article, a number of structural-identification algorithms are reviewed and applied to the identification of structural systems subjected to earthquake excitations, and the performance of the various identification algorithms is critically assessed, and guidelines are obtained regarding their suitability to various engineeri...
Journal ArticleDOI
Estimation of structural parameters in time domain: A substructure approach
TL;DR: In this paper, a substructure approach is used to estimate the stiffness and damping coefficients of structures from measurement of dynamic responses, and the structures are decomposed into smaller subsystems for which state and observation equations are formulated and solved by the method of extended Kalman filter with a weighted global iteration algorithm.
Journal ArticleDOI
Substructural and progressive structural identification methods
Chan Ghee Koh,B. Hong,C. Y. Liaw +2 more
TL;DR: In this paper, a non-classical approach of genetic algorithms is employed as the search tool for its several advantages including ease of implementation and desirable characteristics of global search, and a numerical simulation study is presented, including a fairly large system of 50 degrees of freedom, to illustrate the identification accuracy and efficiency.
Journal ArticleDOI
Substructural Identification Method without Interface Measurement
Chan Ghee Koh,K. Shankar +1 more
TL;DR: In this article, a method for parameter identification of substructures without the need of interface measurements is proposed, where an inverse problem is formulated in the frequency domain and the fitness function is defined to minimize the difference between the estimates of interface forces obtained using different sets of response measurements.
Journal ArticleDOI
Identification of a continuous structure with a geometrical non-linearity. Part I: Conditioned reverse path method
TL;DR: In this article, a continuous non-linear system consisting of an experimental cantilever beam with a geometrical nonlinearity was analyzed using the conditioned reverse path method and proper orthogonal decomposition.
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