Aerodynamic Performance of Quadrotor UAV with Non-Planar Rotors

The mobility of a quadrotor UAV is significantly affected by its aerodynamics, especially when the closely spaced rotors are applied in the multi-rotor system. This paper addresses the aerodynamic modeling of non-planar quadrotor UAV with various rotor spacing (1 d–2 d) and disk plane angle (0–50 deg). The inter-rotor interference and the power models are also proposed in this paper. In order to validate the non-planar model, a series of CFD analyses and experiments were conducted. The obtained results demonstrate that the flow field of the non-planar quadrotor is extremely complicated when the unsteady flow is involved. The pulsation of partial angle of attack and pressure distribution is formed when the blade passes through the vortex. The thrust is increasing significantly along with the tilt angle, resulting from the stronger outflow of the non-planar rotors, which is also leading the power increment. However, the thrust increment is not that obvious when the spacing is larger than 1.4 d. The experiments and the numerical simulation results provide consistent trends and demonstrate the effectiveness of the aerodynamic model of the non-planar quadrotor. The comparison with the traditional planar quadrotor validates that the proposed non-planar quadrotor has better aerodynamic and control performances with a larger power loading.

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Wavelet Neural Network with PLS Feature Extraction and its Application in Aerodynamic Modeling for Aircraft Stall

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.3131 ◽

2014 ◽

Vol 602-605 ◽

pp. 3131-3134

Author(s):

Xu Sheng Gan ◽

Xue Qin Tang ◽

Hai Long Gao

Keyword(s):

Neural Network ◽

Feature Extraction ◽

Least Squares ◽

Partial Least Squares ◽

Test Data ◽

Flight Test ◽

Data Simulation ◽

Aerodynamic Modeling ◽

Aerodynamic Model ◽

Simulation Results

An aerodynamic modeling method based on WNN with Partial Least Squares (PLS) is proposed. In the method, PLS first is applied to extract the feature of original aerodynamic data samples, and then the obtained feature is used to establish the WNN aerodynamic model for aircraft stall from flight test data. Simulation results are given to illustrate that the proposed method is effective and feasible.

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Development of an Aerodynamic Model and Control Law Design for a High Altitude Airship

10.21236/ada451761 ◽

2004 ◽

Cited By ~ 14

Author(s):

Joseph B. Mueller ◽

Michael A. Paluszek ◽

Yiyuan Zhao

Keyword(s):

High Altitude ◽

Control Law ◽

Aerodynamic Model ◽

And Control

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Model development and control of an auto-refrigerated polystyrene polymerization reactor

Transactions of the Institute of Measurement and Control ◽

10.1177/01423312211025125 ◽

2021 ◽

pp. 014233122110251

Author(s):

Reyhane Mokhtarname ◽

Ali Akbar Safavi ◽

Leonhard Urbas ◽

Fabienne Salimi ◽

Mohammad M Zerafat ◽

...

Keyword(s):

Temperature Control ◽

Model Development ◽

Heat Removal ◽

Superior Performance ◽

Polymerization Process ◽

Vacuum System ◽

Control Scheme ◽

Simulation Results ◽

And Control ◽

Operating Plant

Dynamic model development and control of an existing operating industrial continuous bulk free radical styrene polymerization process are carried out to evaluate the performance of auto-refrigerated CSTRs (continuous stirred tank reactors). One of the most difficult tasks in polymerization processes is to control the high viscosity reactor contents and heat removal. In this study, temperature control of an auto-refrigerated CSTR is carried out using an alternative control scheme which makes use of a vacuum system connected to the condenser and has not been addressed in the literature (i.e. to the best of our knowledge). The developed model is then verified using some experimental data of the real operating plant. To show the heat removal potential of this control scheme, a common control strategy used in some previous studies is also simulated. Simulation results show a faster dynamics and superior performance of the first control scheme which is already implemented in our operating plant. Besides, a nonlinear model predictive control (NMPC) is developed for the polymerization process under study to provide a better temperature control while satisfying the input/output and the heat exchanger capacity constraints on the heat removal. Then, a comparison has been also made with the conventional proportional-integral (PI) controller utilizing some common tuning rules. Some robustness and stability analyses of the control schemes investigated are also provided through some simulations. Simulation results clearly show the superiority of the NMPC strategy from all aspects.

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A multigroup model for cholera dynamics and control

International Journal of Biomathematics ◽

10.1142/s1793524516500017 ◽

2015 ◽

Vol 09 (01) ◽

pp. 1650001 ◽

Cited By ~ 2

Author(s):

Drew Posny ◽

Chairat Modnak ◽

Jin Wang

Keyword(s):

Reproduction Number ◽

Vaccination Strategy ◽

Sharp Threshold ◽

Indirect Transmission ◽

Dynamics And Control ◽

Simulation Results ◽

Transmission Pathways ◽

And Control ◽

Control Study ◽

The Basic Reproduction Number

We propose a general multigroup model for cholera dynamics that involves both direct and indirect transmission pathways and that incorporates spatial heterogeneity. Under biologically feasible conditions, we show that the basic reproduction number R0 remains a sharp threshold for cholera dynamics in multigroup settings. We verify the analysis by numerical simulation results. We also perform an optimal control study to explore optimal vaccination strategy for cholera outbreaks.

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Kinematic Analysis of Three-Wire-Driven Parallel (TWDP) Robot

Advanced Engineering Forum ◽

10.4028/www.scientific.net/aef.2-3.302 ◽

2011 ◽

Vol 2-3 ◽

pp. 302-307 ◽

Cited By ~ 1

Author(s):

Tao Yu ◽

Qing Kai Han

Keyword(s):

Static Analysis ◽

Parallel Robot ◽

Analytical Models ◽

Kinematics Analysis ◽

Mechanism Model ◽

Good Movement ◽

Dynamics And Control ◽

Movement Stability ◽

Simulation Results ◽

And Control

In the paper, a novel new gravity-constrained (GC) three-wire-driven (TWD) parallel robot is proposed. With its mechanism model, three typical kinematics analytical models, including horizontal up-down motion, pitching motion and heeling motion and their corresponding simulations are given in detail. In static analysis, the change of tensions in the wires is calculated based on previous kinematics analysis. The simulation results show the robot has good movement stability. The paper can provide useful materials to study of dynamics and control on wire-driven robot.

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A numerical approach for the assessment of crosswind effects on barrier-protected trains running on bridges

10.2749/ghent.2021.0233 ◽

2021 ◽

Author(s):

Giuseppe Porpiglia ◽

Paolo Schito ◽

Tommaso Argentini ◽

Alberto Zasso

Keyword(s):

Wind Tunnel ◽

Velocity Profile ◽

Wind Velocity ◽

Aerodynamic Force ◽

Numerical Approach ◽

Aerodynamic Performance ◽

Vehicle Speed ◽

Initial Condition ◽

Cfd Analyses ◽

Moving Train

<p>This paper introduces a new methodology to assess the influence of a windscreen on the crosswind performance of trains running on a bridge. Considering the difficulties encountered in both carrying out wind tunnel tests that consider the vehicle speed or complete CFD analyses, a simplified CFD approach is here discussed. Instead of simulating simultaneously the windscreen plus the moving train, the numerical problem is split into two parts: firstly, a simulation of the windshield alone is used to extract the perturbed velocity profile at the railway location; secondly, this profile used as an inlet condition for the wind velocity acting on an isolated train. The method is validated against a complete train plus windshield simulation in terms of pressure distribution and aerodynamic force coefficients on the train, and flow streamlines. This approach opens to the possibility of evaluating the aerodynamic performance of a vehicle on bridges considering bridge and vehicle as separated. Wind velocity profiles measured on the bridge during a wind tunnel campaign could be used as the initial condition for numerical simulations on vehicles.</p>

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Methodology for Wheelchair Design Based on Simulation Analyses

10.20944/preprints202112.0318.v1 ◽

2021 ◽

Author(s):

Grzegorz Dobrzynski ◽

Michal Abramowski

Keyword(s):

Modeling And Simulation ◽

Control Systems ◽

Simulation Results ◽

And Control

The article presents the stages of modeling and simulation of a new design of a wheelchair with the option of moving up and down stairs. These analyzes were aimed at the synthesis of the de-sign parameters and parameters of the sensor and control systems. The simulation results were verified by experimentally testing the prototype.

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Fractal analysis and control of the competition model

International Journal of Biomathematics ◽

10.1142/s1793524516500455 ◽

2016 ◽

Vol 09 (03) ◽

pp. 1650045 ◽

Cited By ~ 6

Author(s):

Mianmian Zhang ◽

Yongping Zhang

Keyword(s):

Feedback Control ◽

Mathematical Models ◽

Fractal Analysis ◽

Fractal Geometry ◽

Julia Set ◽

Julia Sets ◽

Competition Model ◽

Simulation Results ◽

Population Competition ◽

And Control

Lotka–Volterra population competition model plays an important role in mathematical models. In this paper, Julia set of the competition model is introduced by use of the ideas and methods of Julia set in fractal geometry. Then feedback control is taken on the Julia set of the model. And synchronization of two different Julia sets of the model with different parameters is discussed, which makes one Julia set change to be another. The simulation results show the efficacy of these methods.

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Decoupling Control for Unwinding Tension Control Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.262.367 ◽

2012 ◽

Vol 262 ◽

pp. 367-371

Author(s):

Min Bian ◽

Mei Yang

Keyword(s):

Control Systems ◽

Strong Coupling ◽

Control Process ◽

Tension Control ◽

Decoupling Control ◽

Driver Model ◽

Control Performance ◽

Printing Quality ◽

Simulation Results ◽

And Control

During the printing process, invariable tension is very important to make sure the high printing quality. It’s well known that the relation of tension and tape velocity is strong-coupling based on the model of tension control, the modeling of tension possesses varies a lot in the control process, and various disturbances are inevitable during printing. All of these make the tension control systems unstable and affect the printing quality. This paper purposes a method to decrease the strong-coupling relation between speed and tension and control the speed-tension accurately. Based on the shaft-less printing press, the unwinding tension model and servo driver model are given. Decoupling controller is designed in this paper, and simulation results show that this method can improve the coupling degree and control performance.

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