Results 261 to 270 of about 1,329,156 (311)
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Decomposition of frequency response functions into paths
Mechanical Systems and Signal Processing, 2022Abstract Frequency response functions (FRFs) lie within the framework of the linear response theory in elastic structures. In FRFs, the inputs/outputs relationships are strictly determined, but there is no way of knowing how waves are propagated and converted from the input signals into the output signals.
Noriaki Yamamoto +4 more
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Measurement of frequency response functions in noisy environments
7th IEEE Conference on Instrumentation and Measurement Technology, 1990The geometric mean is proposed as an alternative averaging technique for frequency response function (FRF) measurements of a linear system. It is shown that it produces almost unbiased measurements even if the input and output measurements are both disturbed with (normal distributed) noise.
Schoukens, Joannes, Pintelon, Rik
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Frequency response function measurements in the presence of nonlinear distortions
Automatica, 2000In this paper, we deal with the measurement of the frequency response function (FRF) of linear dynamic systems in the presence of nonlinear distortions. It is shown that it is possible to detect, qualify and quantify the nonlinear distortions during a broadband frequency response measurement.
Johan Schoukens +3 more
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Accurate Estimation of Multivariable Frequency Response Functions
IFAC Proceedings Volumes, 1996Abstract The nonparametric estimation of multivariable frequency response functions is studied within an "errors-in-variables" stochastic framework. It is shown that, even when the second-order moments of the disturbances are unknown, it is possible by using periodic excitations to obtain consistent and asymptotically effieient point estimates of the
Guillaume, Patrick +2 more
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Frequency-Response Functions of Orthotropic Sandwich Plates
Journal of the Aerospace Sciences, 1961Summary A method is presented for the determination of the frequencyresponse functions of the components of deformation and of stress in orthotropic sandwich plates. It applies to the case of simply supported rectangular plates, loaded by pressure normal to their planes.
Bienick, M. P., Freudenthal, A. M.
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Estimation of Rotational Frequency Response Functions
As it is widely known, in structural dynamic applications, ranging from structural coupling to model updating, the incompatibility between measured and simulated data is inevitable, due to the problem of coordinate incompleteness. Usually, the experimental data from conventional vibration testing is collected at a few translational degrees of freedom ...Silva, Tiago Alexandre Narciso +1 more
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Frequency-Correlation Functions of Frequency Responses in Rooms
The Journal of the Acoustical Society of America, 1962A mathematical study of the random interference of sound waves in large rooms requires statistical methods. “Statistical wave acoustics” is based on the random interference of many simultaneously excited normal modes of a room. In general, the random interference takes place for frequencies above 2000 (T60/V)12, where T60 is the reverberation time (in ...
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Non-stationary frequency response function
Bulletin of Earthquake Engineering, 2013Using the Duhamel’s integral concept, a non-stationary frequency response function (complete-FRF) for the dynamic response of a single degree of freedom system initially at rest has been developed. Although the procedure is devised to be applied in the frequency domain, this new function is time dependent and can be employed to calculate the transient ...
Rafael Blázquez, Juana Arias-Trujillo
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Frequency Response Sensitivity Functions for Helicopter Frequency Domain System Identification
Journal of the American Helicopter Society, 1997This paper addresses some aspects of frequency domain based, state space system identification. A frequency response sensitivity function is developed, and applied to the problem of identifying a coupled rotor-fuselage helicopter model from simulated frequency sweep data.
Christopher Tyler Jones, Roberto Celi
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Convexity of a frequency response are associated with a stable entire function
IEEE Transactions on Automatic Control, 1996Summary: We extend the convexity results for Hurwitz polynomials reported in [\textit{J. C. Hamann} and \textit{B. R. Barmish}, ``Convexity of frequency response arcs associated with a stable polynomial'', IEEE Trans. Automat. Control 38, No. 6, 904-915 (1993; Zbl 0786.93080)]\ to a large class of entire functions.
Nir Cohen, Jacob Kogan
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