Design and Performance of a Quad-Shrouded Rotor Micro Air Vehicle

2014 ◽  
Vol 51 (3) ◽  
pp. 779-791 ◽  
Author(s):  
Vikram Hrishikeshavan ◽  
James Black ◽  
Inderjit Chopra
Keyword(s):  
Micro Air Vehicle ◽  
Air Vehicle ◽  
And Performance ◽  
Shrouded Rotor

Gramian Analysis of a Shrouded Rotor Micro Air Vehicle in Hover

2014 ◽  
Vol 37 (5) ◽  
pp. 1684-1691 ◽  
Author(s):  
Vikram Hrishikeshavan ◽  
J. Sean Humbert ◽  
Inderjit Chopra
Keyword(s):  
Micro Air Vehicle ◽  
Air Vehicle ◽  
Shrouded Rotor

Performance, Flight Testing of a Shrouded Rotor Micro Air Vehicle in Edgewise Gusts

2012 ◽  
Vol 49 (1) ◽  
pp. 193-205 ◽  
Author(s):  
Vikram Hrishikeshavan ◽  
Inderjit Chopra
Keyword(s):  
Micro Air Vehicle ◽  
Flight Testing ◽  
Air Vehicle ◽  
Shrouded Rotor

Measurements and performance prediction of an adaptive wing micro air vehicle

2003 ◽  
Author(s):  
Sergey V. Shkarayev ◽  
Wayne C. Jouse ◽  
William R. Null ◽  
Matthew G. Wagner
Keyword(s):  
Performance Prediction ◽  
Micro Air Vehicle ◽  
Air Vehicle ◽  
Adaptive Wing ◽  
And Performance

Improved Shroud Design for Rotary Wing MAV Applications Based on Computational Analysis

2012 ◽  
Vol 57 (4) ◽  
pp. 1-5
Author(s):  
Vinod K. Lakshminarayan ◽  
James D. Baeder
Keyword(s):  
Computational Analysis ◽  
Micro Air Vehicle ◽  
Navier Stokes ◽  
Circular Shape ◽  
Outer Portion ◽  
Air Vehicle ◽  
Hover Performance ◽  
Significant Performance ◽  
Shrouded Rotor ◽  
Rotary Wing

A compressible Reynolds-averaged Navier–Stokes (RANS) solver is used to improve the design of a microscale shroud applicable for micro air vehicle (MAV) applications. The new shroud is primarily designed to improve the hover performance; however, it is also shaped to better suit nonhovering flight conditions. The proposed shroud design has an elliptic shape on the inner portion of the shroud inlet and a circular shape on the outer portion. A collective angle sweep study of the shrouded rotor configuration using the proposed shroud design shows significant performance benefits in hover.

Aeromechanics and Control of a Shrouded Rotor Micro Air Vehicle in Hover and in Edgewise Flow

2011 ◽  
Vol 56 (4) ◽  
pp. 1-14 ◽  
Author(s):  
Vikram Hrishikeshavan ◽  
Inderjit Chopra
Keyword(s):  
Linear Quadratic Regulator ◽  
Micro Air Vehicle ◽  
Pitching Moment ◽  
Attitude Dynamics ◽  
Linear Quadratic ◽  
Air Vehicle ◽  
Lqr Controller ◽  
Dynamics And Control ◽  
And Control ◽  
Shrouded Rotor

Shrouded rotors are efficient in hover but are quite sensitive to disturbances in external flow. In this paper, the dynamics and control of a shrouded rotor micro air vehicle is studied in hover and when it is subjected to edgewise gust. The importance of incorporating a hingeless rotor in a shrouded rotor configuration was shown and was flight-tested in hover using a proportional-integral attitude feedback controller. In edgewise flow, the shrouded rotor produced up to 300% higher pitching moment than the unshrouded rotor. To counter this pitching moment, the control moments were about 80–100% higher for the shrouded rotor. Time domain attitude dynamics identification of the vehicle, restrained in translation, was conducted with and without the flybar. It was shown to be desirable to incorporate a flybarless rotor for improved maneuverability and hover efficiency. A linear quadratic regulator (LQR) controller was developed based on the extracted attitude dynamics model. Gust disturbance rejection capabilities of the controller were tested with the vehicle in edgewise flow using a spherical gimbal setup. The shrouded vehicle was found to tolerate up to 2 m/s of edgewise gusts, whereas the unshrouded configuration could reject gusts of up to 4.8 m/s.

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