Transonic aeroelastic analyses

McIver, Donald B (1965) Transonic aeroelastic analyses. MSc(R) thesis, University of Glasgow.

Abstract

In this paper, means are investigated whereby the effects on loading of the shock-wave patterns and non-linearities associated with transonic flow may be included in an aeroelastic analysis. These effects if present on a rigid wing would also exist, although in a modified form, for a flexible wing of the same planform under the same flight conditions. Three methods are described for adjusting linearised theoretical aerodynamic influence coefficients so that the predicted aerodynamic load distribution on a rigid wing at incidence and at the required Mach number agrees with the measured distribution. Thereafter, it is assumed that these modified influence coefficients, which are possibly dependent on Incidence, may be applied to the prediction of the load distribution on the same wing planform at the same Mach number but with an arbitrary spanwise twist variation. It is proposed that the methods be applicable throughout the entire speed range but are pursued in detail only for transonic speeds for which the linearised theories break down. Two methods are tested by applying them to wind-tunnel data measured at Mach numbers of 0.30 and 0,94 for a series of flexible wings with different geometrical spanwise twist distributions. The elastic twist distribution for each wing under aerodynamic loading is known or can be calculated. The wings are of aspect ratio 4, quarter-chord sweep of 45

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Additional Information: Adviser: A W Babister
• Keywords: Aerospace engineering
• Date of Award: 1965
• Depositing User: Enlighten Team
• Unique ID: glathesis:1965-72818
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 11 Jun 2019 11:06
• Last Modified: 11 Jun 2019 11:06
• URI: https://theses.gla.ac.uk/id/eprint/72818