scholarly journals INHOMOGENEOUS PLANAR LAYERED CHIRAL MEDIA: ANALYSIS OF WAVE PROPAGATION AND SCATTERING USING TAYLOR'S SERIES EXPANSION

2012 ◽  
Vol 125 ◽  
pp. 119-135 ◽  
Author(s):  
Davoud Zarifi ◽  
Ali Abdolali ◽  
Mohammad Soleimani ◽  
Vahid Nayyeri
Keyword(s):  
Wave Propagation ◽  
Series Expansion ◽  
Media Analysis ◽  
Chiral Media ◽  
Taylor’S Series

THE EVALUATION OF CONTROLLER TRACKING PERFORMANCE BASED ON TAYLOR’S SERIES EXPANSION MODEL

2015 ◽  
Vol 74 (9) ◽  
Author(s):  
Maziyah Mat Noh ◽  
M. R. Arshad ◽  
Rosmiwati Mohd-Mokhtar
Keyword(s):  
Series Expansion ◽  
Sliding Mode ◽  
Equations Of Motion ◽  
Linear Quadratic Regulator ◽  
Tracking Performance ◽  
Convergence Time ◽  
Linear Quadratic ◽  
Glide Path ◽  
Expansion Model ◽  
Taylor’S Series

This paper presents the controller tracking performance of Underwater Glider. The controllers are designed based on linearised model. The equations of motion are restricted to longitudinal plane. The controllers are designed and tested for the glide path moving from 45° to 30° downward and upward. The model is linearised using Taylor’s series expansion linearisation method. The controller developed here is Sliding Mode Control (SMC), and Linear Quadratic Regulator (LQR). The performance of both controllers are compared and analysed. The simulations show SMC produce better performance with about over 30% faster than LQR based its convergence time.

scholarly journals Irreducible Cartesian Tensor Analysis of Harmonic Scattering from Chiral Fluids

Symmetry ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1466
Author(s):  
David L. Andrews
Keyword(s):  
Time Reversal ◽  
Media Analysis ◽  
Boundary Values ◽  
Cpt Symmetry ◽  
Chiral Media ◽  
Third Harmonic ◽  
Symmetry Principles ◽  
Charge Parity ◽  
Chiral Fluids ◽  
A Current

Symmetry principles of several distinct kinds are revealingly engaged in an analysis focussing on third harmonic scattering, a current focus of research on nonlinear optics in chiral media. Analysis in terms of irreducible Cartesian tensors elucidates the detailed electrodynamical origin and character of the corresponding material properties. Considerations of fundamental charge, parity and time reversal (CPT) symmetry reveal the conditions for an interplay of transition multipoles to elicit a chiral response using circularly polarised pump radiation, and the symmetry of quantised angular momentum underpins the associated selection rules and angular distribution. The intrinsic structural symmetry of chiral scatterers determines their capacity to exhibit differential response. Exploiting permutational index symmetry in the response tensors enables quantitative assessment of the boundary values for experimentally measurable properties, including circular intensity differentials.

Wave propagation in moving chiral media: Fizeau's experiment revisited

Radio Science ◽  
1995 ◽  
Vol 30 (5) ◽  
pp. 1313-1324 ◽  
Author(s):  
Yehuda Ben-Shimol ◽  
Dan Censor
Keyword(s):  
Wave Propagation ◽  
Chiral Media

Modeling of unsteady aerodynamic characteristics at high angles of attack

2018 ◽  
Vol 233 (6) ◽  
pp. 2291-2301 ◽  
Author(s):  
Dong Hao ◽  
Lin Zhang ◽  
Jing Yu ◽  
Daiyong Mao
Keyword(s):  
State Space ◽  
Series Expansion ◽  
Angular Rate ◽  
Minimum Mean Square Error ◽  
Aerodynamic Characteristics ◽  
Unsteady Aerodynamic ◽  
Aerodynamic Model ◽  
Constant Pitch ◽  
High Angles Of Attack ◽  
Taylor’S Series

An improved model to express the unsteady aerodynamic characteristics at high angles of attack is presented in this paper. The proposed aerodynamic model is expressed on the basis of a progressive state-space representation and Taylor’s series expansion. The state-space expression is a first-order differential equation in which the power item of the angular rate of attack is introduced. The unsteady aerodynamic coefficients are described by Taylor’s series expansion in terms of input variables. The approach of minimum mean square error criterion is utilized to identify the unknown parameters of the proposed model by nonlinear least square method from the tunnel data. The given modeling method is experimentally demonstrated by the wind tunnel measurements of NACA 0015 airfoil with constant rate to high angles of attack, F18 aircraft with constant pitch rate ramp motion, and F18 HARV (high alpha research vehicle) configuration with large-amplitude harmonic oscillatory. The results show that it is possible to analyze more complex unsteady aerodynamic problems for an aircraft within the framework of the proposed aerodynamic model and the represented model is directly amenable to the simulation and control system design.

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