Review of Linear and Nonlinear Controller Designs

2011 ◽  
pp. 13-19 ◽  
Author(s):  
Ioannis A. Raptis ◽  
Kimon P. Valavanis
Keyword(s):  
Nonlinear Controller ◽  
Linear And Nonlinear

Linear and nonlinear controller design for robust automatic steering

1995 ◽  
Vol 3 (1) ◽  
pp. 132-143 ◽  
Author(s):  
J. Ackermann ◽  
J. Guldner ◽  
W. Sienel ◽  
R. Steinhauser ◽  
V.I. Utkin
Keyword(s):  
Controller Design ◽  
Nonlinear Controller ◽  
Automatic Steering ◽  
Linear And Nonlinear ◽  
Nonlinear Controller Design

Non-Linearization Simulation Research of Linear Active Disturbance Rejection Controller

2013 ◽  
Vol 427-429 ◽  
pp. 1263-1267
Author(s):  
En Rang Zheng ◽  
Hao Yang ◽  
Shi Chen Wang
Keyword(s):  
Disturbance Rejection ◽  
Pid Controller ◽  
Simulation Experiment ◽  
Nonlinear Controller ◽  
Control Effect ◽  
Simulation Research ◽  
Active Disturbance Rejection ◽  
Linear And Nonlinear ◽  
And Performance ◽  
Better Than

The characteristics of PID controller, Active Disturbance Rejection Controller (ADRC) and Linear Active Disturbance Rejection Controller (LADRC) are introduced in the paper, then the parts which can be improved are analyzed, which leads to the topic of balancing linear and nonlinear elements in controller. LADRC with FFTD is used as an example in simulation experiment operated in Matlab7.0.The results shows that the control effect of LADRC with FFTD is better than other three controllers above. The simulation results and perspectives in paper offers reference for combining linear and nonlinear controller and balancing difficulty and performance.

BIFURCATION ANALYSIS OF LINE OF SIGHT VEHICLE GUIDANCE USING SLIDING MODES

1991 ◽  
Vol 01 (04) ◽  
pp. 849-865 ◽  
Author(s):  
FOTIS A. PAPOULIAS
Keyword(s):  
Bifurcation Theory ◽  
Sliding Mode ◽  
Line Of Sight ◽  
Loss Of Stability ◽  
Sliding Modes ◽  
Nonlinear Controller ◽  
Guidance Law ◽  
Numerical Integrations ◽  
Linear And Nonlinear ◽  
Dynamic Loss

The problem of dynamic loss of stability during line-of-sight pursuit navigation of a vehicle under automatic control of a heading sliding mode autopilot is considered. The linear and nonlinear controller gains and the lookahead distance of the guidance law are the main bifurcation parameters. Hopf bifurcation theory techniques are used in order to establish stability of the resulting periodic solutions after the initial loss of stability of straightline motion. The analytical results are confirmed by numerical integrations. It is shown that both linear and nonlinear methods are required in order to evaluate the dynamic response of the system.

Linear and Nonlinear Optical Properties of Natural Dyes Freestanding Films and Application in Optical Limiting

2020 ◽  
pp. 139-143
Keyword(s):  
Absorption Coefficient ◽  
Water Solution ◽  
Optical Limiting ◽  
Refraction Index ◽  
Laser Wavelength ◽  
Solid State Laser ◽  
Natural Dyes ◽  
Linear And Nonlinear ◽  
532 Nm ◽  
Absorbance Spectra

Natural dyes were followed and prepared from a pomegranate, purple carrot, and eggplant peel. The absorbance spectra was measured in the wavelength range 300-800 nm. The linear properties measurements of the prepared natural dye freestanding films were determined include absorption coefficient (α0), extinction coefficient (κ), and linear refraction index (n). The nonlinear refractive index n2 and nonlinear absorption coefficient β2 of the natural dyes in the water solution were measured by the optical z-scan technique under a pumped solid state laser at a laser wavelength of 532 nm. The results indicated that the pomegranate dye can be promising candidates for optical limiting applications with significantly low optical limiting of 3.5 mW.

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

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