Topic
Frequency response
About: Frequency response is a research topic. Over the lifetime, 25705 publications have been published within this topic receiving 332249 citations.
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TL;DR: Based on frequency domain measurements in the 0.9-1.1-GHz band, an autoregressive model for the frequency response of the indoor radio channel is introduced and it is shown that a second-order process is sufficient to represent the important statistical characteristics of the channel both in the frequency domain and the time domain.
Abstract: Based on frequency domain measurements in the 0.9-1.1-GHz band, an autoregressive model for the frequency response of the indoor radio channel is introduced. It is shown that a second-order process is sufficient to represent the important statistical characteristics of the channel both in the frequency domain and the time domain where each pole identifies the arrival of a cluster of paths. A comparison is made between the statistical characteristics of the empirical data and of the channel responses regenerated from the second-order AR processes. Four methods to regenerate the indoor radio channel responses from a second-order AR model are proposed. The accuracy of the methods is examined by comparing the cumulative distribution functions of the RMS delay spread and the 3-dB width of the frequency correlation function with that of the measurements performed in global, local, and mixed indoor radio propagation experiments. >
129 citations
TL;DR: In this article, nonlinear output frequency response functions (NOFRFs) are introduced to detect cracks in beams using frequency domain information, and the results show that the NOFRFs are a sensitive indicator of the presence of cracks providing the excitation is of an appropriate intensity.
128 citations
TL;DR: In this article, a generic model for a two-stage grid-connected photovoltaic (PV) system with frequency response capability, suitable for power system studies, is proposed.
128 citations
TL;DR: In this article, an analytical, linear, state-space model of a thyristor-controlled series capacitor (TCSC) is proposed and the model results are verified using MATLAB and verified against PSCAD/EMTDC in the time and frequency domains for a range of operating conditions.
Abstract: This paper presents an analytical, linear, state-space model of a thyristor-controlled series capacitor (TCSC). First, a simplified fundamental frequency model of TCSC is proposed and the model results are verified. Using frequency response of the nonlinear TCSC segment, a simplified nonlinear state-space model is derived, where the frequency of the dominant TCSC complex poles shows linear dependence on the firing angle. The nonlinear element is linearised and linked with the ac network model and the TCSC controller model that also includes a phase-locked-loop (PLL) model. The model is implemented in MATLAB and verified against PSCAD/EMTDC in the time and frequency domains for a range of operating conditions. The model is sufficiently accurate for most control design applications and practical stability issues in the subsynchronous range.
128 citations
TL;DR: Proctor et al. as mentioned in this paper proposed a piezoelectric transducer with a conical active element and an extended backing for high fidelity acoustic emission (AE) transducers.
Abstract: A piezoelectric transducer has been designed and developed that has promise of being a high fidelity acoustic emission (AE) transducer [T. M. Proctor, Jr., J. Acoust. Soc. Am. Suppl. 1 68, S568 (1980)]. Small transducer contact area, elimination of acoustical interference effects associated with certain geometries, and redistribution of the arrival times of reflected signals originating from various elements of the transducer were the guiding criteria in the design. This transducer consists of a conical active element and an extended backing. The transducer’s performance has been compared to a line capacitance transducer using surface wave signals. These comparisons indicate an amplitude response which is flat within ±3 dB for the frequency range of 50 kHz to 1 MHz. The over‐all displacement sensitivity is nominally 2×108 V/m. Factors that influence frequency response such as backing geometry and aperture size have been experimentally investigated and results are reported.
127 citations