Nonlinear aeroelastic response of a typical airfoil section with control surface freeplay

2000 ◽  
Author(s):  
Deman Tang ◽  
Denis Kholodar ◽  
Earl Dowell
Keyword(s):  
Control Surface ◽  
Aeroelastic Response ◽  
Airfoil Section

Nonlinear response of airfoil section with control surface freeplay to gust loads

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 1543-1557 ◽  
Author(s):  
Deman Tang ◽  
Denis Kholodar ◽  
Earl H. Dowell
Keyword(s):  
Nonlinear Response ◽  
Control Surface ◽  
Airfoil Section ◽  
Gust Loads

Further study on aeroelastic response of aircraft wing with freeplay

2011 ◽  
Vol 18 (11) ◽  
pp. 1690-1697 ◽  
Author(s):  
Fusheng Wang ◽  
Shihui Huo ◽  
Zhufeng Yue ◽  
Wei Qian
Keyword(s):  
Time History ◽  
Step Length ◽  
Control Surface ◽  
Response Analysis ◽  
Lumped Mass ◽  
Aircraft Wing ◽  
Lattice Method ◽  
Aeroelastic Response ◽  
Freeplay Nonlinearity ◽  
External Program

The complex aeroelastic equation of an aircraft wing with freeplay nonlinearity was built and applied for aeroelastic response analysis. This took into account multiple lumped mass points and directions of the control surface using the Roger rational function approximation. The aerodynamic analysis was based on the subsonic doublet lattice method and the external program of time history analysis method was employed. The aeroelastic response results show that amplitudes of generalized displacement considering the freeplay effect is decreased compared with those not considering the freeplay effect, and influenced by freeplay stiffness coefficients. Constant and variable step length calculations of the fourth order Runge-Kutta method can influence the results and efficiency.

Experimental Aeroelastic Response for a Freeplay Control Surface in Buffeting Flow

AIAA Journal ◽  
2013 ◽  
Vol 51 (12) ◽  
pp. 2852-2861 ◽  
Author(s):  
Deman Tang ◽  
Earl H. Dowell
Keyword(s):  
Control Surface ◽  
Aeroelastic Response

Nonlinear Response of Airfoil Section with Control Surface Freeplay to Gust Loads

AIAA Journal ◽  
2000 ◽  
Vol 38 (9) ◽  
pp. 1543-1557 ◽  
Author(s):  
Deman Tang ◽  
Denis Kholodar ◽  
Earl H. Dowell
Keyword(s):  
Nonlinear Response ◽  
Control Surface ◽  
Airfoil Section ◽  
Gust Loads

Characterization of carbides in M50NiL

1991 ◽  
Vol 49 ◽  
pp. 606-607
Author(s):  
L. S. Lin ◽  
K. P. Gumz ◽  
A. V. Karg ◽  
C. C. Law
Keyword(s):  
Temperature Effects ◽  
Base Composition ◽  
Lattice Parameter ◽  
Control Surface ◽  
Carbide Formation ◽  
Particle Sizes ◽  
Low Carbon ◽  
Fee Structure ◽  
Heat Treated

Carbon and temperature effects on carbide formation in the carburized zone of M50NiL are of great importance because they can be used to control surface properties of bearings. A series of homogeneous alloys (with M50NiL as base composition) containing various levels of carbon in the range of 0.15% to 1.5% (in wt.%) and heat treated at temperatures between 650°C to 1100°C were selected for characterizations. Eleven samples were chosen for carbide characterization and chemical analysis and their identifications are listed in Table 1.Five different carbides consisting of M6C, M2C, M7C3 and M23C6 were found in all eleven samples examined as shown in Table 1. M6C carbides (with least carbon) were found to be the major carbide in low carbon alloys (<0.3% C) and their amounts decreased as the carbon content increased. In sample C (0.3% C), most particles (95%) encountered were M6C carbide with a particle sizes range between 0.05 to 0.25 um. The M6C carbide are enriched in both Mo and Fe and have a fee structure with lattice parameter a=1.105 nm (Figure 1).

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