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  • 1
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    Variations of strong earthquake shaking in the Los Angeles area (1974)
    In:  Bull. Seism. Soc. Am., Warszawa, EGS, vol. 64, no. 1-3, pp. 1429-1454, pp. 1089, (ISSN: 1340-4202)
    Details
    Publication Date: 1974
    Keywords: Strong motions ; Site amplification ; USA ; California ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Analysis of errors in digitized strong-motion accelerograms (1973)
    In:  Bull. Seism. Soc. Am., Warszawa, EGS, vol. 63, no. 1-3, pp. 157-187, pp. 1089, (ISSN: 1340-4202)
    Details
    Publication Date: 1973
    Keywords: Strong motions ; Seismology ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    On the identification of continuous vibrating systems modelled by hyperbolic partial differential equations (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: This paper deals with the identification of spatially varying parameters in systems of finite spatial extent which can be described by second order hyperbolic differential equations. Two questions have been addressed. The first deals with 'partial identification' and inquires into the possibility of retrieving all the eigenvalues of the system from response data obtained at one location x-asterisk epsilon (0, 1). The second deals with the identification of the distributed coefficients rho(x), a(x) and b(x). Sufficient conditions for unique identification of all the eigenvalues of the system are obtained, and conditions under which the coefficients can be uniquely identified using suitable response data obtained at one point in the spatial domain are determined. Application of the results and their usefulness is demonstrated in the identification of the properties of tall building structural systems subjected to dynamic load environments.
    Keywords: CYBERNETICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Pulse control of single degree-of-freedom system (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The possibility of using active control for structural and mechanical systems is examined. Open loop adaptive control of structural systems subjected to deterministic and stochastic excitations is considered by means of an algorithm for a single-degree-of-freedom oscillator. The algorithm is heuristic and requires continuous monitoring of the state variables, with a pulse control applied when some prespecified level of control is exceeded. The control algorithm is based on the principle that the gradual rhythmic increase of the structural response can be eliminated by applying a pulse of suitable magnitude in the proper direction, thereby avoiding the application of large forces over sustained periods of time. The optimum pulse magnitude is determined as the minimum rms response of the system. Application to linear and nonlinear systems, as well as in chatter suppression, are outlined.
    Keywords: CYBERNETICS
    Type: American Society of Civil Engineers; Journal
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Some aspects of the identification of continuous vibrating systems (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: This paper deals with the identification of systems described by the one-dimensional, second order wave equation. Such equations arise commonly in various areas of mathematical physics, such as, acoustics, elastic wave propagation, and electromagnetic theory. Assuming that suitable measurements are made at only one point in the spatial domain, sufficient conditions for unique identification of the system eigenvalues and system coefficients are presented.
    Keywords: CYBERNETICS
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    NASA TECHNICAL REPORTS
  • 6
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    Optimal Sensor Locations for Structural Identification (1985)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: The optimum sensor location problem, OSLP, may be thought of in terms of the set of systems, S, the class of input time functions, I, and the identification algorithm (estimator) used, E. Thus, for a given time history of input, the technique of determining the OSL requires, in general, the solution of the optimization and the identification problems simultaneously. A technique which uncouples the two problems is introduced. This is done by means of the concept of an efficient estimator for which the covariance of the parameter estimates is inversely proportional to the Fisher Information Matrix.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Proc. of the Workshop on Identification and Control of Flexible Space Struct., Vol. 3; p 247-261
    Format: application/pdf
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  • 7
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    Nonparametric identification of a class of nonlinear close-coupled dynamic systems (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A nonparametric identification technique for the identification of close coupled dynamic systems with arbitrary memoryless nonlinearities is presented. The method utilizes noisy recorded data (acceleration, velocity and displacement) to identify the restoring forces in the system. The masses in the system are assumed to be known (or fairly well estimated from the design drawings). The restoring forces are expanded in a series of orthogonal polnomials and the coefficients of these polynomial expansions are obtained by using least square fit method. A particularly simple and computationally efficient method is proposed for dealing with separable restoring forces. The identified results are found to be relatively insensitive to measurement noise. An analysis of the effects of measurement noise on the quality of the estimates is given. The computations are shown to be relatively quick (when compared say to the Wiener identification method) and the core storage required relatively small, making the method suitable for onboard identification of large space structures.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: NASA-CR-164948 , JPL-PUB-81-48
    Format: application/pdf
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  • 8
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    On-line pulse control for structural and mechanical systems (1981)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper studies the feasibility of using open-loop adaptive on-line pulse control for limiting the response of large linear multidegree of freedom systems subjected to general dynamic loading environments. Pulses of short durations are used to control the system when the system response exceeds a given threshold level. The pulse magnitudes are obtained in closed form, leading to large computational efficiencies when compared with optimal control theoretic methods. The technique is illustrated for a structural system subjected to earthquake-like base excitations.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 81-0636 , Conference on Structures, Structural Dynamics and Materials; Apr 06, 1981 - Apr 08, 1981; Atlanta, GA
    Format: text
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  • 9
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    A nonparametric identification method for a class of non-linear systems (1981)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A relatively simple nonparametric method for the identification of a class of close-coupled nonlinear multi-degree-of-freedom systems has been developed. The identification of arbitrary memoryless nonlinearities is possible through knowledge of the accelerations, velocities, and displacements of the various masses. These quantities are used to obtain the surfaces of the restoring forces as functions of the intermass displacements and velocities. The method was demonstrated by application to a four-degree-of-freedom system to identify the restoring forces. It is found that the identification results are relatively insensitive to measurement noise.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 81-0527 , Conference on Structures, Structural Dynamics and Materials; Apr 06, 1981 - Apr 08, 1981; Atlanta, GA
    Format: text
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