Effects of the Sting Oscillation on the Measurements of Dynamic Stability Derivatives

 

Marija Samardžić

Zoran Anastasijević

Dragan Marinkoviski

Jovan Isaković

 

This paper presents a method for determination the effects of the sting oscillation on the measurements of dynamic derivatives due to oscillatory pitching. Measurements of stability derivatives in the T-38 trisonic blowdown wind tunnel of the Military Technical Institute in Belgrade are described. The paper presents the sample tests results of pitch-damping measurements of the Modified Basic Finner Model made using the new mathematics model of stability derivatives measurements at Mach numbers 0.6. The test results are compared with published experimental data from the AEDC wind tunnel (USA) and with calculated pitch-damping coefficient values obtained by the DMAC semi-empirical method developed by the Military Technical Instute.

Key words: wind tunnel, experimental aerodynamics, aerodynamic derivatives, stability derivatives, forced oscillations, pitching.