scholarly journals Validation and Verification of a Numerical Prediction Method for Lift-off Acoustics of Launch Vehicles

2017 ◽  
Vol 15 (0) ◽  
pp. 7-12
Author(s):  
Seiji TSUTSUMI ◽  
Keita TERASHIMA
Keyword(s):  
Prediction Method ◽  
Numerical Prediction ◽  
Launch Vehicles ◽  
Validation And Verification ◽  
Lift Off

scholarly journals An Equivalent Damping Numerical Prediction Method for the Ring Damper Used in Gears under Axial Vibration

Symmetry ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1469 ◽  
Author(s):  
Shuai Wang ◽  
Xiaolei Wang ◽  
Yanrong Wang ◽  
Hang Ye
Keyword(s):  
Structural Parameters ◽  
Great Influence ◽  
Prediction Method ◽  
Forced Response ◽  
Numerical Prediction ◽  
Axial Stiffness ◽  
Response Analysis ◽  
Axial Vibration ◽  
Equivalent Damping ◽  
Vibration Loads

In aircraft gas turbine engines, gears in the transmission system are typically cyclic in structure and inevitably encounter large dynamic loads, such as meshing excitation, resulting in high vibration loads in resonance. To prevent gear resonance failure, a ring damper is employed to reduce the resonance response. As relative motion between the gear and the ring damper occurs, vibration loads can be reduced by friction energy dissipation. Moreover, the gears in the aircraft engine are thin-walled and their axial stiffness is much smaller than radial stiffness; thus, it is easier for axial vibration to cause resonance failure. This paper proposes an equivalent damping numerical prediction method for a ring damper under axial vibration, which greatly shortens the calculation time and prevents the forced response analysis of nonlinear structures. Via this method, the influence of ring damper structural parameters on friction damping in gears under axial vibration is investigated. The results indicate that the friction coefficient and mass of the ring damper have a great influence on damping performance.

scholarly journals Numerical Prediction Method for Local Scour with 3D Body-Fitted Coordinates

1995 ◽  
Vol 39 ◽  
pp. 683-688
Author(s):  
Satoru Ushijima ◽  
Nobukazu Tanaka
Keyword(s):  
Prediction Method ◽  
Numerical Prediction ◽  
Local Scour

scholarly journals The Quantitative Forecast of Precipitation with the Numerical Prediction Method

1955 ◽  
Vol 33 (5) ◽  
pp. 205-216 ◽  
Author(s):  
M. Komabayasi ◽  
K. Miyakoda ◽  
M. Aihara ◽  
S. Manabe ◽  
K. Katow
Keyword(s):  
Prediction Method ◽  
Numerical Prediction

Experimental study on lift-off acoustic environments of launch vehicles by scaled cold jet

2014 ◽  
Vol 136 (4) ◽  
pp. 2168-2168
Author(s):  
Hiroki Ashida ◽  
Yousuke Takeyama ◽  
Kiyotaka Fujita ◽  
Aki Azusawa
Keyword(s):  
Experimental Study ◽  
Launch Vehicles ◽  
Lift Off ◽  
Acoustic Environments

scholarly journals NUMERICAL PREDICTION METHOD FOR ARBITRARILY-SHAPED BODIES MOVING IN THREE-DIMENSIONAL FLUIDS

2007 ◽  
Vol 51 ◽  
pp. 847-852
Author(s):  
Satoru USHIJIMA ◽  
Akira FUKUTANI ◽  
Susumu FUJIOKA ◽  
Iehisa NEZU
Keyword(s):  
Three Dimensional ◽  
Prediction Method ◽  
Numerical Prediction
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