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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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Journal ArticleDOI
TL;DR: Nonlinearities affecting cochlear mechanics produce appreciable compression in the basilar membrane (BM) input/output (I/O) functions at the characteristic frequency for sound-pressure levels (SPLs) as low as 20 dB (re: 20 microPa).
Abstract: Nonlinearities affecting cochlear mechanics produce appreciable compression in the basilar membrane (BM) input/output (I/O) functions at the characteristic frequency for sound‐pressure levels (SPLs) as low as 20 dB (re: 20 μPa) This is thought to depend upon saturation of the outer hair cell (OHC) mechanoelectrical transducer (MET) This hypothesis was tested by solving a nonlinear integrodifferential equation that describes the BM vibration in an active cochlea The equation extends a previously developed linear approach [Mammano and Nobili, J Acoust Soc Am 93, 3320–3332 (1993)], here modified to include saturating MET, with a few corrections mainly concerning tectorial membrane resonance and OHC coupling to the BM Stationary solutions were computed by iteration in the frequency domain for a wide range of input SPLs, generating BM I/O functions, frequency response envelopes, and two‐tone distortion products Traveling‐wave amplitude envelopes were also computed for a fixed suppressor and several suppressed tones in order to evidence the phenomenon of two‐tone suppression (frequency masking) at the mechanical level All results accord nicely with experimental data

119 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented the load frequency control of an interconnected two-area power system under deregulated environment with area 1 as a thermal system having two generating companies and area 2 as hydro-thermal system.
Abstract: This study presents the load frequency control of an interconnected two-area power system under deregulated environment with area1 as a thermal system having two generating companies and area2 as hydro-thermal system. Appropriate generation rate constraint, and governor dead band are provided in the areas. Three-degree-of-freedom integral-derivative (3DOF-ID) controllers are used as secondary controllers in the areas whose performance is compared with that of two-degree-of-freedom integral-derivative (2DOF-ID) and single-degree-of-freedom controllers such as integral (I), integral-derivative (ID). Biogeography-based optimisation (BBO) technique is used for simultaneous optimisation of controller gains and electric governor parameters. Analysis of the dynamic responses reveal the superiority of 3DOF-ID controller over I, ID, and 2DOF-ID controllers, in terms of settling time, peak deviation and magnitude of oscillation. Sensitivity analysis proved that, BBO optimised parameters obtained at nominal conditions are robust. 3DOF-ID controller parameters obtained at nominal distribution companies participation matrix (DPM) are healthy enough and not necessary to optimise for change in DPMs. Variation in frequency bias coefficient (B) concludes that the best selection for B is equal to area frequency response characteristics. Similarly, selection of governor speed regulation parameter (R) infers higher value for thermal-system, while hydro-system should be kept comparatively low.

119 citations

Journal ArticleDOI
TL;DR: In this article, several impedance spectroscopy models found useful for data fitting and interpretation of dielectric and conductive-system frequency data are briefly summarized and compared, and it is concluded, on the basis of both experimental and synthetic data fitting, that the corrected modulus formalism approach, with a temperature and ionic-concentration independent fractional exponent, β 1C ≤ 1/3, is the most appropriate model for representing the hopping response of homogeneous materials; an effective medium nearlyconstant-loss model describes such experimental loss data well; and the

119 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed analytical results for vibration control of structures with one or more Tuned Mass Dampers (TMDs) and showed that at least p TMDs with properly placed attachments to the structure are necessary to control the response.
Abstract: Analytical results are developed for vibration control of structures with one or more Tuned Mass Dampers (TMDs). The input is a harmonic load with a range of possible frequencies. The control objective is to reduce the maximum amplitude of the structural response. Perturbation theory is used with three sets of small parameters: the ratio of TMD and structural modal masses, the damping of the system, and the differences between the structural and loading frequencies. It is shown analytically that for structures with widely spaced natural frequencies, the response can be approximated accurately by the response of the well-known single-mode structure/TMD system. For structures with p closely spaced natural frequencies, more general analytical results are developed to describe the coupling between the motions of the p modes of the structure and the multiple TMDs. The results show that at least p TMDs with properly placed attachments to the structure are necessary to control the response. If fewer TMDs are used, the maximum frequency response has a lower bound which is independent of the properties of the TMDs. The TMD placement is shown to be always important, regardless of the spacing of the structure's natural frequencies. The results are illustrated for both lumped-mass and continuous structures.

119 citations

Journal ArticleDOI
TL;DR: In this article, the harmonic components in the nonlinear system response to a sinusoidal input calculated using nonlinear output frequency response functions (NOFRFs) are one of the solutions obtained using the harmonic balance method (HBM).

118 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023154
2022389
2021857
20201,105
20191,212
20181,152