Differential Aerodynamic Force-Based Formation Control of Nanosatellites Using Yaw Angle Deviation

2021 ◽  
pp. 1-15
Author(s):  
Yuandong Hu ◽  
Zhengliang Lu ◽  
Wenhe Liao ◽  
Xiang Zhang
Keyword(s):  
Formation Control ◽  
Aerodynamic Force ◽  
Angle Deviation ◽  
Yaw Angle

scholarly journals Formation Control of Satellites in Low Earth Orbit by Using Moving Masses

2021 ◽  
Author(s):  
Jianqing Li ◽  
Shameng Wen ◽  
Hua Zhong
Keyword(s):  
Formation Control ◽  
Aerodynamic Force ◽  
Adaptive Controller ◽  
Low Earth Orbit ◽  
Control Technique ◽  
Earth Orbit ◽  
Control Input ◽  
Moving Mass ◽  
Orbit Control ◽  
Satellite Attitude

Abstract This paper investigates a formation control technique based on the use of moving masses. First, the mechanism of the moving mass control is conducted to reveal the relation between the attitude and the offsets of moving masses. Then, to achieve the desired formation control, the aerodynamic force generated by the change of attitudes is used as the control input to implement the orbit control. The moving masses and magnetic torquers constitute a combined actuator to drive the satellite attitude. To deal with the offset saturation of moving masses, an adaptive controller is investigated. Finally, a simulation on two satellites formation is provided, demonstrating the feasibility of the proposed method.

Aerodynamics of a Rugby Ball

2012 ◽  
Vol 79 (2) ◽  
Author(s):  
A. J. Vance ◽  
J. M. Buick ◽  
J. Livesey
Keyword(s):  
Aerodynamic Force ◽  
Angular Position ◽  
Separation Point ◽  
Aerodynamic Forces ◽  
Ball Speed ◽  
Flow Visualizations ◽  
Lift And Drag ◽  
Yaw Angle ◽  
Linear Manner ◽  
Existing Data

This paper describes the aerodynamic forces on a rugby ball traveling at speeds between 5 and 15 ms−1. This range is typical of the ball speed during passing play and a range of kicking events during a game of rugby, and complements existing data for higher velocities. At the highest speeds considered here, the lift and drag coefficients are found to be compatible with previous studies at higher velocities. In contrast to these higher speed investigations, a significant variation is observed in the aerodynamic force over the range of velocities considered. Flow visualizations are also presented, indicating how the flow pattern, which is responsible for the aerodynamic forces, changes with the yaw angle of the ball. This flow and, in particular, the position of the separation points, is examined in detail. The angular position of the separation point is found to vary in a linear manner over much of the surface of the rugby ball; however, this behavior is interrupted when the separation point is close to the ‘tip’ of the ball.

scholarly journals Numerical investigation for the influence of the car underbody on aerodynamic force and flow structure evolution in crosswind

2018 ◽  
Vol 10 (10) ◽  
pp. 168781401879750
Author(s):  
Zhiqun Yuan ◽  
Zhengqi Gu ◽  
Yiping Wang ◽  
Xiaoqun Huang
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Physical Mechanism ◽  
Aerodynamic Force ◽  
Simulation Models ◽  
Structure Evolution ◽  
Vehicle Stability ◽  
Visualization Technique ◽  
Yaw Angle ◽  
Dynamics Method

To investigate the aerodynamic behavior of underbody structure in crosswind conditions, two numerical simulation models have been developed by using computational fluid dynamics method. First, to validate the accuracy of these models, the wind tunnel experiment of model with simplified flat underbody has been designed. The computationally predicted results of realizable k-e model show consistency with experimental data, and the correlation deviation of aerodynamic force is less than 10%. By using such model, the aerodynamic force and flow field of car under steady crosswind are simulated using underbody structure, and the influence on the aerodynamic characteristic has been analyzed. It can be found that the aerodynamic force increased significantly under different yaw angle. The physical mechanism response has been clearly shown by investigating the flow field around car body by vortices visualization technique. The results of this study can be served as a suggestion for studying the vehicle stability of high-speed under crosswind.

Flutter Analysis of Long-Span Suspension Bridges Considering Yaw Wind and Aerostatic Effects

2021 ◽  
Author(s):  
Xin-Jun Zhang ◽  
Fu-Bin Ying ◽  
Lei-Lei Sun
Keyword(s):  
Wind Speed ◽  
Aerodynamic Force ◽  
Coupling Effect ◽  
Suspension Bridge ◽  
Computational Procedure ◽  
Wind Effect ◽  
Suspension Bridges ◽  
Long Span ◽  
Flutter Analysis ◽  
Yaw Angle

Based on the aerostatic and self-excited aerodynamic force models, a computational approach of three-dimensional (3D) refined flutter analysis for long-span bridges under skew winds is established, in which the structural nonlinearity, aerostatic effect and full-mode coupling effect, etc., are fully considered, and the computational procedure ([Formula: see text] flutter-sw) is developed accordingly. By taking the Runyang Suspension Bridge over the Yangtze river as an example, under the wind attack with initial angles of 0∘ and [Formula: see text] and yaw angles between 0∘ and 25∘, the flutter stability of the bridge in completion under skew winds is analyzed, and the influences of skew wind and aerostatic effect on the flutter stability of suspension bridges are assessed. The results show that the aerostatic effect has a significant influence on the flutter stability of long-span suspension bridge, and it may worsen its flutter stability, with an average decrease of 6.0%. However, it does not change the evolution of flutter stability of suspension bridge with increasing wind yaw angle. The critical flutter wind speed fluctuates with the increase of wind yaw angle, and it reaches the lowest value mostly under the skew wind, with an average reduction of 8.0%. The combined influence of the aerostatic effect and skew wind further reduces the flutter critical wind speed by 11.5% on average, and therefore, the aerostatic effect, skew wind effect and their adverse influences need to be comprehensively considered in the flutter analysis of long-span suspension bridges.

Withdrawal: Ascent Aerodynamic Force and Moment Database Development for the Space Launch System

2019 ◽  
Author(s):  
Patrick R. Shea ◽  
Jeremy T. Pinier ◽  
Heather P. Houlden ◽  
Amber L. Favaregh ◽  
Michael J. Hemsch ◽  
...  
Keyword(s):  
Aerodynamic Force ◽  
Database Development ◽  
Space Launch
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