Results 141 to 150 of about 74,669 (264)

Performance Data from a Wind-Tunnel Test of Two Main-rotor Blade Designs for a Utility-Class Helicopter [PDF]

An investigation was conducted in the NASA Langley Transonic Dynamics Tunnel to evaluate an advanced main rotor designed for use on a utility class helicopter, specifically the U.S. Army UH-60A Blackhawk.
Singleton, Jeffrey D., Wilbur, Matthew L., Yeager, William T., Jr.   +2 more
core   +1 more source

Controlling the flow loss of a supersonic compressor rotor using the blade slotting method

Advances in Mechanical Engineering
The flow loss in the blade passage of a supersonic compressor rotor mainly comes from the boundary layers on the blade surface and end wall, the shock wave, the shock wave/boundary layer interaction, and tip leakage flow; the instability is mainly caused
Xinlong Ye, Zhenggui Zhou
doaj   +1 more source

Automation of structural cross sectional rotor blade modelling for aeromechanical rotor blade optimization

, 2018
It is often difficult to predict the behavior of helicopters, given their complex aeromechanical operating environments. Given these uncertainties, it is often the case that flight tests need to be conducted prior to a design being "frozen". To improve the whole design and validation procedure, it is essential that the design freeze (and iterations ...
van de Kamp, Bram, Wilke, Gunther Andreas   +1 more
openaire   +1 more source

Vibratory Loads Data from a Wind-Tunnel Test of Structurally Tailored Model Helicopter Rotors [PDF]

An experimental study was conducted in the Langley Transonic Dynamics Tunnel to investigate the use of a Bell Helicopter Textron (BHT) rotor structural tailoring concept, known as rotor nodalization, in conjunction with advanced blade aerodynamics as ...
Hamouda, M-Nabil H., Idol, Robert F., Mirick, Paul H., Singleton, Jeffrey D., Wilbur, Matthew L., Yeager, William T., Jr.   +5 more
core   +1 more source

Wind-tunnel investigation of the effects of blade tip geometry on the interaction of torsional loads and performance for an articulated helicopter rotor [PDF]

The Langley transonic dynamics tunnel was used to determine the degree of correlation between rotor performance and the dynamic twist generated by changes in blade tip geometry using an articulated rotor with four different tip geometries at advance ...
Mantay, W. R., Yeager, W. T.
core   +1 more source

Three-dimensional, transonic rotor flow field reconstructed from holographic interferogram data [PDF]

Holographic interferometry and computer-assisted tomography (CAT) are used to determine the transonic flow field of a model rotor blade in hover. A pulsed ruby laser records 40 interferograms with a 61 cm-diam view field near the model rotor-blade tip ...
Becker, F., Kittleson, J. K., Yu, Y. H.
core   +1 more source

Analytical investigation of blade efficiency for two-dimensional supersonic turbine rotor blade sections [PDF]

Blade efficiency in producing vortex flow within two dimensional supersonic rotor blade ...
Goldman, L. J.
core   +1 more source

Hingeless rotor frequency response with unsteady inflow [PDF]

Hingeless rotor frequency response calculations are obtained by applying a generalized harmonic balance to the elastic blade flapping equations.
Peters, D. A.
core   +1 more source

Validation of the procedures [PDF]

Validation strategies are described for procedures aimed at improving the rotor blade design process through a multidisciplinary optimization approach.
Mantay, Wayne R.
core   +1 more source

A parrot optimizer for solving multiobjective design sensor placement in helicopter main rotor blade. [PDF]

Sci Rep
Aldawsari H.
europepmc   +1 more source