Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535211
Title: Development and evaluation of a wind tunnel manoeuvre rig
Author: Pattinson, John
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2010
Availability of Full Text:
Access through EThOS:
Abstract:
A novel wind tunnel rig, which can be used to collect data from high incidence, large amplitude manoeuvres is presented. The "manoeuvre rig" is a horizontal-pendulum type rig that is capable of large amplitude motions in up to five degrees of freedom. The rig consists of. two gimbals, an arm to provide an element of translation to the model centre of gravity, an aerodynamic compensation device, and a scale aircraft model. It is remotely controlled allowing largely unhindered motion and the potential for the investigation of feedback control laws. To assess the manoeuvre rig concept, a pilot rig was designed, manufactured and operated. For the tests, an existing approximate-scale model of the BAe Hawk aircraft is used. Mathematical models of the rig components and their dynamics are developed, with additions that account for friction. Small amplitude manoeuvres, typical of conventional testing, are performed. Mathematical models, describing the longitudinal aerodynamics of the Hawk, are fitted to this data using parameter estimation methods. Excellent results are achieved in the one degree-of-freedom pitch configuration. In two degrees-of-freedom pitch and heave, the results are not as good and the reasons for this are discussed. The Hawk model exhibits significant nonlinear behaviour at high angles of attack. This is thought to be related to dynamic stall and a suitable mathematical model is developed. Continuation and bifurcation analysis is used to analyse this model and fit it to experimental data. Qualitative agreement between the model and the data is achieved and influence of friction on the rig dynamics is discussed. The rig's capabilities are further evaluated by the demonstration of large amplitude, three degree of freedom (roll, pitch and yaw) tests, velocity vector rolls (roll and pitch) and four degree (roll, pitch, yaw and sway) of freedom snake-like motions. The manoeuvre rig is shown to be suitable for the extraction of longitudinal aerodynamic models. It is capable of generating small- and large-amplitude unsteady motions so that aircraft responses can be demonstrated and studied. As such, the rig shows promise for aerodynamic model extraction for nonlinear dynamics and departure
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.535211  DOI: Not available
Share: