Propeller Blade Strength

2019 ◽  
pp. 437-452
Author(s):  
J.S. Carlton
Keyword(s):  
Propeller Blade

FEATURES OF CONSTRUCTION OF ON-BOARD HELICOPTER RADAR ICE EXPLORATION ON BASIS OF CIRCULAR GROUND SURFACE WITH SYNTHESIS OF APERTURE ROTATING ANTENNA

2019 ◽  
pp. 31-37
Author(s):  
I. G. Antсev ◽  
A. P. Aleshkin ◽  
V. V. Vladimirov ◽  
E. O. Kudrina ◽  
O. L. Polonchik ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Ground Surface ◽  
Rotor Blades ◽  
Navigation Systems ◽  
Propeller Blade ◽  
Antenna Aperture ◽  
Sensing System ◽  
Radar Systems ◽  
Simulation Results ◽  
Circular Antenna Array

The results of modeling the processes of receiving and processing the signals of remote sensing of the Earth’s surface using helicopter radar and synthesizing the antenna aperture due to its placement on the rotating rotor blades are presented. The mathematical correctness of the application of the developed algorithms for processing probing signals, as well as the uniqueness of the measurements, was confirmed. At the same time, the dimensions of the synthesized aperture due to the rotation of the radiator placed at the end of the propeller blade are equivalent to a circular antenna array with a diameter of tens of meters. The functionality of the remote sensing system based on this radar meets the requirements for ice observation and navigation systems for seagoing ships off the coast. The simulation results confirm the promise of further research in this direction and can be used in the development of radar systems with synthesized antenna aperture mounted on rotating rotor blades.

scholarly journals Large scale advanced propeller blade pressure distributions - Prediction and data

1989 ◽  
Author(s):  
M. NALLASAMY ◽  
O. YAMAMOTO ◽  
S. WARSI ◽  
L. BOBER
Keyword(s):  
Large Scale ◽  
Propeller Blade ◽  
Pressure Distributions

scholarly journals Analysis of Dynamic Characteristics of a Propeller Blade Subjected to Large Material Removal in Milling

2020 ◽  
pp. 10-14
Author(s):  
Luyi Han ◽  
◽  
Riliang Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Behavior ◽  
Dynamic Characteristics ◽  
Material Removal ◽  
Natural Frequencies ◽  
Machining Process ◽  
Time Varying ◽  
Propeller Blade ◽  
Large Material

A propeller blade, as a typical example of low-rigidity components, is prone to chatter and deformation in machining process, especially when large material removal is applied. In order to foresee the problems and then optimize the process, identification of the dynamic behavior of the workpiece is of great importance. This paper studies the dynamic characteristics of the workpiece in the machining process from plate to propeller blade using Finite Element Method. The results show that the time-varying natural frequencies of the workpiece decrease gradually at the beginning steps of the process due to the influence of material removal, and increases afterwards influenced by the geometry of the blade.

scholarly journals Roughness of propeller blade surface and its implications for propulsion performance

2019 ◽  
Vol 4 (390) ◽  
pp. 11-26
Author(s):  
A. Pustoshny ◽  
◽  
A. Sverchkov ◽  
S. Shevtsov ◽  
◽  
...  
Keyword(s):  
Blade Surface ◽  
Propeller Blade ◽  
Propulsion Performance

scholarly journals Numerical Investigation of Viscous Flow Velocity Field around a Marine Cavitating Propeller

2014 ◽  
Vol 6 ◽  
pp. 272316 ◽  
Author(s):  
Zhifeng Zhu
Keyword(s):  
Velocity Field ◽  
Bubble Dynamics ◽  
Volume Fraction ◽  
Tip Vortex ◽  
Navier Stokes ◽  
Back Side ◽  
Propeller Blade ◽  
Propeller Wake ◽  
Numerical Predictions ◽  
Hybrid Grid

Velocity field around a ship cavitating propeller is investigated based on the viscous multiphase flow theory. Using a hybrid grid, the unsteady Navier-stokes (N-S) and the bubble dynamics equations are solved in this paper to predict the velocity in a propeller wake and the vapor volume fraction on the back side of propeller blade for a uniform inflow. Compared with experimental results, the numerical predictions of cavitation and axial velocity coincide with the measured data. The evolution of tip vortex is shown, and the interaction between the tip vortex of the current blade and the wake of the next one occurs in the far propeller wake. The frequency of velocity signals changes from shaft rate to blade rate. The phenomena reflect the instability of propeller wake.

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