Topic
Frequency response
About: Frequency response is a research topic. Over the lifetime, 25705 publications have been published within this topic receiving 332249 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, a general model based on Hamilton's principle and spectral analysis was developed for non-linear free vibrations occurring at large displacement amplitudes of fully clamped beams and rectangular homogeneous and composite plates.
177 citations
27 Nov 2007
TL;DR: In this article, a frequency-domain analysis of an active disturbance rejection-based control system is performed to quantify its performance and stability characteristics, and the result shows that the active-disturbance rejection based control system possesses a high level of robustness.
Abstract: Active Disturbance Rejection is a relatively new, and quite different, design concept that shows much promise in obtaining consistent response in an industrial control system full of uncertainties. But most of the development and analysis has previously been shown in the time-domain. In this paper, frequency-domain analysis of such a control system is performed to quantify its performance and stability characteristics. The transfer function description of the controller is derived and, together with a highly uncertain linear time-invariant plant, the loop gain frequency response is analyzed. The result shows that the active disturbance rejection based control system possesses a high level of robustness. The bandwidth and stability margins, in particular, are nearly unchanged as the plant parameters vary significantly; so is the sensitivity to input disturbance. Such characteristics makes this control system an appealing solution in dealing with real world control problems where uncertainties abound.
177 citations
TL;DR: In this article, a theoretical approach for the representation of microstrip discontinuities by equivalent circuits with frequency-dependent parameters is presented, which accounts accurately for the substrate presence and associated surface-wave effects, strip finite thickness, and radiation losses.
Abstract: A theoretical approach for the representation of microstrip discontinuities by equivalent circuits with frequency-dependent parameters is presented. The model accounts accurately for the substrate presence and associated surface-wave effects, strip finite thickness, and radiation losses. The method can also be applied for the solution of microstrip components in the millimeter frequency range.
176 citations
TL;DR: In this article, a laser Doppler velocimeter is described in which the laser is employed not only as a light source, but also as a mixer-oscillator, in order to give a simpler optical system.
Abstract: A laser Doppler velocimeter is described in which the laser is employed not only as a light source, but also as a mixer-oscillator, in order to give a simpler optical system. The efficiency is comparable to that of a con-ventional system, such as a Michelson interferometer, and coherence requirements do not impose very severe restrictions. The frequency response of the system is also considered. Measurements of the coherence and frequency response of the system are also given.
176 citations
TL;DR: In this article, the authors proposed an indirect approach for extracting bridge frequencies from a passing vehicle, which works mainly for the first frequency and can be used to extract bridge frequencies of higher modes.
175 citations