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  • 1
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    Damping modeling in Timoshenko beams (1992)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Theoretical and numerical results of damping model studies for composite material beams using the Timoshenko theory is presented. Based on the damping models developed for Euler-Bernoulli beams, the authors develop damping methods for both bending and shear in investigation of Timoshenko beams. A computational method for the estimation of the damping parameters is given. Experimental data with high-frequency excitation were used to test Timoshenko beam equations with different types of damping models for bending and shear in various combinations.
    Keywords: STRUCTURAL MECHANICS
    Type: In: 1992 American Control Conference, 11th, Chicago, IL, June 24-26, 1992, Proceedings. Vol. 3 (A93-22776 07-63); p. 2139-2143.
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  • 2
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    Bending rate damping in elastic systems (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Preliminary results of an investigation of the bending rate damping model for elastic structures are presented. A model for which the internal damping term is physically plausible and which can accomodate cantilevered boundary conditions is discussed. The model formulation and mathematical foundations are given, and numerical results are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: IEEE Conference on Decision and Control; Dec 13, 1989 - Dec 15, 1989; Tampa, FL; United States
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  • 3
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    Parameter identification techniques for the estimation of damping in flexible structure experiments (1987)
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    Publication Date: 2019-07-13
    Description: The use of spline-based inverse procedures to estimate damping coefficients for flexible structures in distributed-parameter systems is reported. Damping models involving viscous (air) damping and Kelvin-Voigt damping in an Euler-Bernoulli framework are used to analyze data from vibration experiments with composite material beams.
    Keywords: STRUCTURAL MECHANICS
    Type: IEEE Conference on Decision and Control; Dec 09, 1987 - Dec 11, 1987; Los Angeles, CA; United States
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  • 4
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    The identification of a distributed parameter model for a flexible structure (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A computational method is developed for the estimation of parameters in a distributed model for a flexible structure. The structure we consider (part of the RPL experiment) consists of a cantilevered beam with a thruster and linear accelerometer at the free end. The thruster is fed by a pressurized hose whose horizontal motion effects the transverse vibration of the beam. The Euler-Bernoulli theory is used to model the vibration of the beam and treat the hose thruster assembly as a lumped or point mass dashpot spring system at the tip. Measurements of linear acceleration at the tip are used to estimate the hose parameters (mass, stiffness, damping) and a Voigt-Kelvin viscoelastic structural damping parameter for the beam using a least squares fit to the data. Spline based approximations are considered to the hybrid (coupled ordinary and partial differential equations) systems; theoretical convergence results and numerical studies with both simulation and actual experimental data obtained from the structure are presented and discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: SIAM Journal on Control and Optimization (ISSN 0363-0129); 26; 743-762
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  • 5
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    Estimation of Boltzmann damping coefficients in beam models (1988)
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    Publication Date: 2019-07-13
    Description: A distributed parameter model of a flexible structure with Boltzmann type viscoelastic damping is discussed. A computational method for the estimation of the damping parameters is developed, and theoretical convergence results are given. An example is presented in which actual experimental data is used, demonstrating the efficacy of the computational method and the plausibility of the model for predicting response in damped structures.
    Keywords: STRUCTURAL MECHANICS
    Type: ComCon Workshop on Stabilization of Flexible Structures; Dec 11, 1987 - Dec 15, 1987; Montpellier; France
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  • 6
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    Spatial versus time hysteresis in damping mechanisms (1988)
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    Publication Date: 2019-07-13
    Description: A description is given of continuing investigations on the task of estimating internal damping mechanisms in flexible structures. Specifically, two models for internal damping in Euler-Bernoulli beams are considered: spatial hysteresis and time hysteresis. A theoretically sound computational algorithm for estimation is described, and experimental results are discussed. It is concluded that both models perform well in the sense that they accurately predict response for the experiments conducted.
    Keywords: STRUCTURAL MECHANICS
    Type: IEEE Conference on Decision and Control; Dec 07, 1988 - Dec 09, 1988; Austin, TX; United States
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