نتایج جستجو برای: fractional damped beam
تعداد نتایج: 179314 فیلتر نتایج به سال:
The fractional Fourier transform (FRFT) is a useful tool for signal processing. It is the generalization of the Fourier transform. Many fractional operations, such as fractional convolution, fractional correlation, and the fractional Hilbert transform, are defined from it. In fact, the FRFT can be further generalized into the linear canonical transform (LCT), and we can also use the LCT to defi...
Light emerging from a spiral phase plate with a non-integer phase step has a complicated vortex structure and is unstable on propagation. We generate light carrying fractional orbital angular momentum (OAM) not with a phase step but by a synthesis of Laguerre-Gaussian modes. By limiting the number of different Gouy phases in the superposition we produce a light beam which is well characterised ...
The present study uses linear quadratic regulator (LQR) theory to control a vibratory system modeled by fractional-order differential equation. First, as an example of such system, viscoelastically damped structure is selected. Second, LQR designed for in which terms are contained the equation motion. An iteration-based method solving algebraic Riccati proposed order obtain feedback gains LQR. ...
We study in this paper the stability of a system type Rao–Nakra sandwich beam whole line $\mathbb{R}$ under linear frictional dampings acting on two wave equations. prove that $L^2(\mathbb{R})$-norm solutions and their higher order derivatives with respect to space variable converge polynomially zero as time goes infinity. These decay estimates are obtained independently parameters spite fact E...
The proposed future International Linear Collider (ILC) will collide electrons and positrons. Because positrons are antimatter, they are harder to produce than electrons and need to be accumulated and conditioned in a damping ring. The Cornell Electron Storage Ring Test Accelerator (CesrTA) at the Cornell Laboratory for Accelerator-based Sciences and Education (CLASSE) is similar to the damping...
In this paper we propose to use digital fractional sample delayers to perform high precision beam steering at the baseband sampling frequency. The major advantages of the proposed technique are that the fractional sample delayer (FSD) used has a very flat magnitude response within the baseband width allowing greater than 20-bit resolution for a 35-tap Finite Impulse Response filter. It also has...
The CESR Luminosity Upgrade Plan consists of several consecutive steps, or phases [1]. At the present time, this program is in Phase II. The next step, Phase III, would yield a luminosity of 1x1033cm-2sec-1 with 45 bunches in each beam for a total current of 1 A. This plan utilizes four superconducting single-cell cavities with an accelerating gradient of 6 MV/m, which corresponds to a peak acc...
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