... is to establish a simple experimental procedure to calibrate pitch instrumentation and classical control algorithms. This includes developing an efficient pitch angle observer with optimal estimation and evaluating controllers under uncertainty and external disturbances. Design/methodology/approach A wind...

... proposed for achieving in-flight thrust measurements involve complicated, sensitive and expense instruments, an acoustics-based approach is discussed that greatly simplifies the technology development pathway to in-flight applications. Findings Results are provided for a minimum set of sensors applied...

... obtained in these measurements by rotation of the distortion while leaving the instrumentation stationary. Extensive analysis of the PIV data has yielded information on the mechanisms for mean-flow axial development, interaction details between the distortion and the spinner, fan acceleration effects...