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RISA Reduced Second-Order Approach for Linear Viscoelastic Oscillators
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper proposes a new approach for the reduction in the model-order of linear multiple-degree-of-freedom viscoelastic systems via equivalent second-order systems. The assumed viscoelastic forces ...
Lancaster’s Method of Damping Identification Revisited
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Identification of damping is an active area of research in structural dynamics. In one of the earliest works, Lancaster [1] proposed a method to identify the viscous damping matrix from measured ...
Doubly Spectral Stochastic Finite-Element Method for Linear Structural Dynamics
Publisher: American Society of Civil Engineers
Abstract: Uncertainties in complex dynamic systems play an important role in the prediction of a dynamic response in the mid- and high-frequency ranges. For distributed parameter systems, parametric uncertainties can be represented ...
Modal Analysis of Linear Asymmetric Nonconservative Systems
Publisher: American Society of Civil Engineers
Abstract: In this work, classical modal analysis has been extended to treat lumped parameter asymmetric linear dynamic systems. In the presence of general nonconservative forces, the damping matrix is not simultaneously diagonalizable ...
Closure to “Modal Analysis of Linear Asymmetric Nonconservative Systems” by Sondipon Adhikari
Publisher: American Society of Civil Engineers
Wishart Random Matrices in Probabilistic Structural Mechanics
Publisher: American Society of Civil Engineers
Abstract: Uncertainties need to be taken into account for credible predictions of the dynamic response of complex structural systems in the high and medium frequency ranges of vibration. Such uncertainties should include uncertainties ...
Iterative Methods for Eigenvalues of Viscoelastic Systems
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper proposes a new iterative approach for the calculation of eigenvalues of single and multiple degree-of-freedom viscoelastic systems. The Biot model of viscoelasticity is assumed. With ...
Multilevel Decomposition Framework for Reliability Assessment of Assembled Stochastic Linear Structural Systems
Publisher: ASCE
Abstract: To reduce the computational cost of assembled stochastic linear structural dynamic systems, a three-staged reduced order model-based framework for forward uncertainty propagation was developed. First, the physical domain ...
Reliability Analysis of Structures by Active Learning Enhanced Sparse Bayesian Regression
Publisher: American Society of Civil Engineers
Abstract: Adaptive sampling near a limit state is important for metamodeling-based reliability analysis of structures involving an implicit limit state function. Active learning based on the posterior mean and standard deviation ...
Transient Dynamics of Stochastically Parametered Beams
Publisher: American Society of Civil Engineers
Abstract: The problem of determining the statistics of the transient response of randomly inhomogeneous beams is formulated. This is based on the use of stochastic dynamic stiffness coefficients in conjunction with the fast Fourier ...