Method for Calculating Rotors with Active Gurney Flaps

Aerodynamics of Gurney Flaps on a Wing in Ground Effect

Phase-rotors in an active medium

Vortices of unusual form (rotating straight lines), phase-rotors, are found to occur in an active medium. Transitions between phase-rotors and Archimedian spiral waves are studied. The role of the dispersion relation in vortex development is discussed. Rotating nonlinear waves in active media have been attracting attention of the researchers during several decades. Such waves are found to occur...

New Hybrid Optimization for Design of Active Twist Rotors

This paper presents the development of a mixed-variable optimization framework for the aeroelastic analysis and design of active twist rotors. Proper tailoring of the blade properties can lead to the maximization of the active twist and the control authority for vibration reduction under operating conditions. Thus, using mathematical optimization, the crosssectional layout is designed using con...

Wind Tunnel Testing of a Full Scale Helicopter Blade Section with an Upstream Active Gurney Flap

Wind tunnel tests were performed on an aerofoil section comparable to that of a full scale helicopter blade section with an upstream active Gurney flap in the framework of the European project CleanSky ITD Green RotorCraft. A modified NACA0012 profile was used, with 23 Kulite pressure transducers embedded in the profile’s surface and with an integrated actuator system for the Gurney flap. The G...

Simple Method for Calculating Backside Via Inductance

Backside via self-inductance is a critical electrical quantity needed for the design of Monolithic Millimeter-wave Integrated Circuits (MMIC). We have investigated a simple, analytical method for accurately calculating via inductance based upon physical geometry. The analytical method enables backside via process development to be tailored to meet design goals. Conversely, the sensitivity of RF...