Analysis on Metamorphic of the Cable-Driven Parallel Mechanism in Wind Tunnel Test

2013 ◽  
Vol 336-338 ◽  
pp. 1196-1203
Author(s):  
Qing Lin Chen ◽  
Qi Lin
Keyword(s):  
Wind Tunnel ◽  
Parallel Mechanism ◽  
Wind Tunnel Test ◽  
Kinematics And Dynamics ◽  
High Angle ◽  
High Angle Of Attack ◽  
New Methods ◽  
Methods Of Calculation ◽  
Metamorphic Mechanism ◽  
Metamorphic Mechanisms

The workspace is limited in the fixed parameters of cable-driven parallel mechanism and interference often happens between cables and surfaces of actuator. The fundamental basis of metamorphic mechanisms is addressed in accordance with the design, kinematics and dynamics, as well as the compliant metamorphic mechanisms. Metamorphic structure was applied to the cable-driven parallel mechanism. The more adaptive metamorphic mechanism is the full mobile hinge, which provided whole workspace of the frame. Through adding the adaptive hinge, the workspace was extended. The new methods of distant to detect interference between cables and faces of actuator was discussed and applied to a 6 DOF cable-driven parallel mechanism. Comparing with other methods of calculation of interference, it showed more accurate and provided a function to metamorphic control. The volume of interference was coherent and the force of cable was smoother to control when testing the high angle of attack.

Workspace analysis and verification of cable-driven parallel mechanism for wind tunnel test

2016 ◽  
Vol 231 (6) ◽  
pp. 1012-1021 ◽  
Author(s):  
Xiaoguang Wang ◽  
Yunbo Hu ◽  
Qi Lin
Keyword(s):  
Wind Tunnel ◽  
Parallel Mechanism ◽  
Aerodynamic Force ◽  
Wind Tunnel Test ◽  
Special Kind ◽  
Parallel Robot ◽  
System Construction ◽  
Vector Projection ◽  
Workspace Analysis ◽  
Projection Strategy

Cable-driven parallel mechanism is a special kind of parallel robot in which traditional rigid links are replaced by actuated cables. This provides a new suspension method for wind tunnel test, in which an aircraft model is driven by a number of parallel cables to fulfil 6-DOF motion. The workspace of such a cable robot is limited due to the geometrical and unilateral force constraints, the investigation of which is important for applications requiring large flight space. This paper focuses on the workspace analysis and verification of a redundant constraint 6-DOF cable-driven parallel suspension system. Based on the system motion and dynamic equations, the geometrical interference (either intersection between two cables or between a cable and the aircraft) and cable tension restraint conditions are constructed and analyzed. The hyperplane vector projection strategy is used to solve the aircraft’s orientation and position workspace. Moreover, software ADAMS is used to check the workspace, and experiments are done on the prototype, which adopts a camera to monitor the actual motion space. In addition, the system construction is designed by using a built-in six-component balance to measure the aerodynamic force. The results of simulation and tests show a good consistency, which means that the restraint conditions and workspace solution strategy are valid and can be used to provide guidance for the cable-driven parallel suspension system’s application in wind tunnel tests.

scholarly journals Research on high attack angle stall and spin characteristics with flight test of a general electric aircraft

2021 ◽  
Vol 39 (3) ◽  
pp. 650-659
Author(s):  
Yadong Li ◽  
Junyao Zhang ◽  
Fengtian Yang ◽  
Yongliang Chen
Keyword(s):  
Numerical Simulation ◽  
Aspect Ratio ◽  
Aerodynamic Force ◽  
Angle Of Attack ◽  
Wind Tunnel Test ◽  
Flight Test ◽  
High Angle ◽  
High Angle Of Attack ◽  
Linear Change ◽  
Electric Aircraft

When the aircraft is flying at high angle of attack, the local separation of the air flow on the surface of the aircraft, the linear change of aerodynamic force is destroyed, and the maneuverability and stability are reduced to varying degrees, resulting in the aircraft stalling or entering the spin. The stall characteristics and spin characteristics directly affect the safety of the aircraft. In order to analyze the stall and spin characteristics, a full-scale 6-DOF nonlinear high angle of attack dynamic model is established for a two-seater electric high aspect ratio aircraft based on the wind tunnel test data. The stall characteristics of an electric aircraft at high angle of attack are obtained by numerical simulation and analysis. According to the stall characteristics of simulation calculation, flight test is carried out to verify the reliability of numerical simulation, which provides reference for the later analysis of stall/spin test of large aspect ratio series electric aircraft at nonlinear high angle of attack.

Analysis about the Work Space of a 3-RPR Parallel Mechanism Based Wind Tunnel Experiment Platform

2015 ◽  
Vol 741 ◽  
pp. 646-650
Author(s):  
Yong Jin Hu ◽  
Wen Jia Chen ◽  
Lu Yang Li ◽  
Jian Zhang ◽  
Zi Yan Shao
Keyword(s):  
Wind Tunnel ◽  
Parallel Mechanism ◽  
Wind Tunnel Test ◽  
Wind Tunnel Experiment ◽  
Work Space ◽  
Experiment Platform ◽  
Test Platform ◽  
Dimensional Parameters ◽  
Position Solution ◽  
The Impact

This paper introduces the characteristics of a 3-RPR parallel mechanism based on the wind tunnel experiment platform, makes use of the constraint condition of the inverse position solution of the structure, and uses MATLAB software to draw images of their work space and analyze the impact of the dimensional parameters of wind tunnel platform on the scope of work space, and it provides a theoretical basis for the design and practical of wind tunnel test platform.

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