Effects of rotation

2020 ◽  
pp. 197-258
Keyword(s):  
Author(s):  
Sterling McBride ◽  
Ricardo Burdisso ◽  
Corina Sandu

ABSTRACT Tire-pavement interaction noise (TPIN) is one of the main sources of exterior noise produced by vehicles traveling at greater than 50 kph. The dominant frequency content is typically within 500–1500 Hz. Structural tire vibrations are among the principal TPIN mechanisms. In this work, the structure of the tire is modeled and a new wave propagation solution to find its response is proposed. Multiple physical effects are accounted for in the formulation. In an effort to analyze the effects of curvature, a flat plate and a cylindrical shell model are presented. Orthotropic and nonuniform structural properties along the tire's transversal direction are included to account for differences between its sidewalls and belt. Finally, the effects of rotation and inflation pressure are also included in the formulation. Modeled frequency response functions are analyzed and validated. In addition, a new frequency-domain formulation is presented for the computation of input tread pattern contact forces. Finally, the rolling tire's normal surface velocity response is coupled with a boundary element model to demonstrate the radiated noise at the leading and trailing edge locations. These results are then compared with experimental data measured with an on-board sound intensity system.


Author(s):  
Roger W. Moss ◽  
Roger W. Ainsworth ◽  
Tom Garside

Measurements of turbine blade surface heat transfer in a transient rotor facility are compared with predictions and equivalent cascade data. The rotating measurements involved both forwards and reverse rotation (wake free) experiments. The use of thin-film gauges in the Oxford Rotor Facility provides both time-mean heat transfer levels and the unsteady time history. The time-mean level is not significantly affected by turbulence in the wake; this contrasts with the cascade response to freestream turbulence and simulated wake passing. Heat transfer predictions show the extent to which such phenomena are successfully modelled by a time-steady code. The accurate prediction of transition is seen to be crucial if useful predictions are to be obtained.


1993 ◽  
Vol 169 (5) ◽  
pp. 1215-1217 ◽  
Author(s):  
Alberto Manetta ◽  
Edward Manetta ◽  
Dennis Emma ◽  
K.A. Keegan ◽  
J.H. Williams

1992 ◽  
Vol 19 (1-12) ◽  
pp. 55-59 ◽  
Author(s):  
Matthias M. Henneberg ◽  
Daryl J. Pocker ◽  
Michael A. Parker

1996 ◽  
Vol 55 (1-4) ◽  
pp. 199-210
Author(s):  
G. -Q. Li ◽  
R. Kung ◽  
R. L. Pfeffer

Author(s):  
A. E. Abouelregal ◽  
Hijaz Ahmad ◽  
S. K. Elagan ◽  
Nawal A. Alshehri

This paper focuses on studying thermal, elastic and coupled plasma waves, in the sense of a photo-thermal process transport within an infinite semiconductor medium. In order to study photo-thermal interactions in two-dimensional semiconducting materials, a new mathematical model based on the Moore–Gibson–Thompson equation (MGTE) is implemented. The MGTE model involving the Green–Naghdi model of type III as well as the heat transport equation proposed by Lord and Shulman. We consider the semi-conductor half-space is rotated at a uniform angular speed and magnetized. The analysis of the distribution of thermophysical fields has been extracted by a normal mode method, represented graphically and discussed. The results predicted by the new and improved model have been compared with the generalized and classic ones. In addition, all field quantities have been examined for effects of rotation, a lifetime of the photo-generated, and the applied magnetic field.


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