for the unknown column vector u(x , t) defined in some volume in space, V. Here, L is a linear partial differential operator in the spatial coordinate(s), x~, though the known continuous coefficients may be functions of t as well. For example, in a simple model for a single lifting rotor blade in forward flight, the dimensionless transverse displacement of the uniform blade satisfies the dimens...

The paper reviews recent achievements in the application of smart-materials actuation to counteract aeroelastic and vibration effects in helicopters and fixed wing aircraft. A brief review of the induced-strain actuation principles and capabilities is done first. Attention is then focused on the smart rotor blade applications. Induced twist, active blade tip, and active blade flap are presented...

By making use of a suite of programs for designing profile geometry, cutter geometry and predicting the thermodynamic performance of a twin screw compressor, this paper investigates techniques of obtaining an optimised rotor cutter blade design. The techniques for using different geometric schemes for setting clearances are explained, and the techniques for optimising main manufacturing paramet...

A probabilistic methodology to quantify the impact of geometric variability on compressor aerodynamic performance is presented. High-fidelity probabilistic models of geometric variability are derived using a principal-component analysis of blade surface measurements. This probabilistic blade geometry model is then combined with a compressible, viscous blade-passage analysis to estimate the impa...

Measurements of the structure and evolution of the tip vortex from a rotor in low-speed forward flight are presented. On the advancing blade spanwise flow on the pressure side of the blade is comparable in magnitude to the inflow. Core circumferential velocity profiles show multiple features during formation. Trajectories and peak core velocities of the tip-vortex during its formation on top of...

Title of dissertation: COMPREHENSIVE AEROELASTIC ANALYSIS OF HELICOPTER ROTOR WITH TRAILING-EDGE FLAP FOR PRIMARY CONTROL AND VIBRATION CONTROL Jinwei Shen, Doctor of Philosophy, 2003 Dissertation directed by: Professor Inderjit Chopra Department of Aerospace Engineering A comprehensive aeroelastic analytical model of helicopter rotors with trailingedge flaps for primary and vibration controls ...

Recent achievements in the application of activematerials induced-strain actuation to counteract aeroelastic and vibration effects in helicopters and fixed wing aircraft are reviewed. First, the induced-strain actuation principles and capabilities are briefly presented. Next, the attention is focused on the smart rotor blade applications. Induced twist, active blade tip, and active blade flap a...

The paper reviews recent achievements in the application of smart-materials actuation to counteract aeroelastic and vibration effects in helicopters and fixed wing aircraft. A brief review of the induced-strain actuation principles and capabilities is done first. Attention is then focused on the smart rotor blade applications. Induced twist, active blade tip, and active blade flap are presented...

The Axial compressor is an integrated part of a gas turbine. The central part of compressors is its blades. Blade aerodynamic has a significant effect on compressor performance. Because of the adverse pressure gradient in the compressor, any deviation in the blade profile has a significant influence on the flow field as well as the compressor performance. During the manufacturing and operation ...