A Six Degrees of Freedom Dynamic Wire-Driven Traverse

Lambert, Thomas; Vukašinović, Bojan; Glezer, Ari

doi:10.3390/aerospace3020011

Cited by 13 publications

(5 citation statements)

References 13 publications

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“…The sting motion is controlled using a dynamic 6-DOF eight servo-motor traverse (Figure 2a) that is described in detail by Lambert et al (2016b). Figure 2b shows the coordinate system that is used for the motion of the sting (in red, x s , z s ), and the model (in blue, x m , z m ), where the crossstream directions (y s , y m ) are defined to make each coordinate system righthanded, and the angles of attack are defined: α x roll about x axis, α y pitch about y axis, and α z yaw about z axis.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…An inherent difficulty with wind tunnel investigations of nominally 'free' aerodynamic bodies is related to their mounting in a wind tunnel's test section. The model is connected by a lowfriction gimbal bearing to a sting whose attitude and displacement are dynamically manipulated by wire mounting to a programmable 6-DOF (x/y/z-translation and roll/pitch/yaw) eight-wire dynamic traverse that is electromechanically driven by a dedicated feedback controller (Lambert et al, 2016b). The model is free to precess in pitch, yaw, and roll in response to flow-induced aerodynamic loads that are controlled using fluidic modification of the aerodynamic coupling to the near wake by four independently-controlled aft mounted synthetic jet actuators.…”

Section: Technical Backgroundmentioning

confidence: 99%

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Aerodynamic Flow Control of Wake Dynamics Coupled to a Moving Bluff Body

Lambert

Vukašinović

Glezer

2016

8th AIAA Flow Control Conference

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The dynamic motion of an axisymmetric bluff body that is free to precess in pitch, yaw, and roll as a response to flow-induced aerodynamic loads is investigated in open-and closed-loop flow control wind tunnel experiments at Re D < 2·10 5 . The body is coupled to an upstream wire-mounted sting through a low-friction hinge bearing within its front end that enables nearlyfree rotations in pitch (15), yaw (18), and roll (180). The attitude and displacement of the sting are dynamically manipulated in 6-DOF using eight support wires that are each connected to a servo actuator through an in-line load cell for monitoring the instantaneous tension. The aerodynamic loads on the body, and thereby its motion, are controlled through fluidic modification of its aerodynamic coupling to its near wake using four independently-controlled aft mounted synthetic jet actuators that effect azimuthally-segmented flow attachment over the model's tail end. The effects of actuation-induced, transitory changes in the model's aerodynamic loads are measured by its motion response using image tracking (600 fps) and the coupled evolution of the near-wake flow captured by high-speed (500 fps) stereo PIV. Flow control authority is demonstrated by feedbackcontrolled manipulation of the model's dynamic response when the sting is held stationary or when it is subjected to commanded transitory pitch-yaw trajectory disturbances. It is shown that this flow control approach can modify the stability and damping of the model's motion when the sting is stationary (e.g., suppression or amplification of its natural oscillations), and impose a desired directional attitude that is decoupled from the moving sting using actuation-effected disturbance rejection.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: Technical Backgroundmentioning

confidence: 99%

Aerodynamic Flow Control of Wake Dynamics Coupled to a Moving Bluff Body

Lambert

Vukašinović

Glezer

2016

8th AIAA Flow Control Conference

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“…A wire driven parallel suspension system with eight wires (WDPSS-8) was developed as a WDPR application for the wind tunnel at Xiamen University, 13 with which the aerodynamic parameters were computed from the signals of eight tension sensors on the wires with that system. Lambert et al 14 investigated a platform supported by the wire driven traverse (WDT) utilizing eight thin wires and demonstrated its capabilities on an axisymmetric bluff body in a low speed wind tunnel. The WDT realized high-frequency harmonic motions using a wheel that was directly connected to a servo motor and accurately monitored force responses with in-line load cells.…”

Section: Introductionmentioning

confidence: 99%

Wire-driven parallel robot suspension system for SDM in a low-speed wind tunnel

Peng

Lin

et al. 2023

Advances in Mechanical Engineering

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A wire-driven parallel robot with eight wires (WDPR-8) acting as the suspension system for an aircraft model in a low-speed wind tunnel is introduced in this paper. A kinematics model for WDPR-8 is established here. A theoretical basis is also provided, through which movement control of the model is achieved by changing the wire length. A model motion control subsystem, a monocular vision measurement subsystem for the model position, and a data acquisition subsystem were also developed for WDPR-8. A prototype of WDPR-8 was built and mounted in a low-speed wind tunnel with an open test section. A six-component strain-gauge balance was installed inside the test model to acquire aerodynamic parameters. The aerodynamic coefficients of the static test show reasonable agreement with reference results. The difference between the test result of WDPR-8 and the results from reference is smaller in the positive angle of attack than the negative angle of attack, and the total difference between WDPR-8 and other facilities is under 10%. Pitch dynamic tests with different amplitudes and frequencies were used to verify the aerodynamic hysteresis phenomena. The research indicates it is successful that the solution of measuring aerodynamic parameters with strain-gauge balance set into the standard dynamic model suspended by WDPR. It demonstrates that WDPR-8 is effective and feasible as a model suspension system in a low-speed wind tunnel. Furthermore, test results without interference correction in accordance with the reference data proves that the interference of Wire-Driven support system to flow field during wind tunnel tests is negligible. Finally, WDPR suspension system introduced in this paper will remarkably improve the efficiency and accuracy in wind tunnel test.

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“…The system is designed for 150 kg weight and a motion frequency of 0.5 Hz at an amplitude of approximately 0.5m in the low-speed wind tunnel. Lambert [7]- [8] developed a cabledriven dynamically-controlled wind tunnel traverse mechanism in 6-DOF to investigate the coupling between a blunt body and the embedding flow during a controlled maneuver. Lin and Wang [9], [10] made kinematic and dynamic analyses of the cable-driven suspension system, conducted some typical tests in the low-speed wind tunnel, and obtained static and unsteady aerodynamic forces by using the internal six-force balance.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement Learning-Based Composite Controller for Cable-Driven Parallel Suspension System at High Angles of Attack

Wang

Shen

et al. 2022

IEEE Access

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This paper investigates an intelligent method for the motion control of a cable-driven parallel suspension system (CDPSS) in wind tunnel tests, especially at high angles of attack, which is characterized by unsteady and nonlinear aerodynamics. Considering the modeling uncertainties and the complex aerodynamic interference, a composite controller that combines deep deterministic policy gradient (DDPG) and computed-torque is proposed to improve the control performance. The tasks at hand consist in the construction of the training environment based on the dynamic equations and the Markov Decision Process (MDP) design. The supplementary computed-torque control is used to enhance the learning rate of the agent. Then a well-trained agent is applied in the high angles of attack maneuvers control with different examples, including single-DOF and multi-DOF coupled motion. The simulation results show the controller could fulfill the training tasks efficiently, and it turns out to be robust and maintain strong generalization ability despite handling the unlearned tasks. INDEX TERMSWind tunnel test, cable-driven parallel mechanism, high angle of attack, motion control, DDPG.

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A Six Degrees of Freedom Dynamic Wire-Driven Traverse

Cited by 13 publications

References 13 publications

Aerodynamic Flow Control of Wake Dynamics Coupled to a Moving Bluff Body

Aerodynamic Flow Control of Wake Dynamics Coupled to a Moving Bluff Body

Wire-driven parallel robot suspension system for SDM in a low-speed wind tunnel

Reinforcement Learning-Based Composite Controller for Cable-Driven Parallel Suspension System at High Angles of Attack

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