REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

A forced oscillation system for damping derivative measurement in the T-38 Trisonic Wind Tunnel

Marija Samardžić

Military Technical Institute, Belgrade, majasam@ptt.rs

Dragan G. Marinkovski

Military Technical Institute, Belgrade, draganski53@gmail.com

Dušan S. Ćurčić

Military Technical Institute, Belgrade dusan.curcic@vti.vs.rs

Abstract: A forced oscillation system for the measurement of damping derivative due to an aircraft or missile model oscillatory motion in a wind tunnel test section is described. The forced oscillation technique is used for dynamic stability derivatives measurements in the T-38 wind tunnel. Two full-model apparatuses for oscillatory experiments in pitch/yaw and in roll are shown. Oscillatory motion is imparted to the model by hydraulic driving mechanism. Control unit operates directly with hydraulic servo-valve and provides a desired oscillatory motion of the model.

Keywords: damping derivative, wind tunnel, oscillatory experiments.