scholarly journals Integrated optimization of control surface layout for gust load alleviation

2019 ◽  
Vol 10 (4) ◽  
pp. 1059-1069 ◽  
Author(s):  
Manuel Pusch ◽  
Andreas Knoblach ◽  
Thiemo Kier
Keyword(s):  
Control Surface ◽  
Integrated Optimization ◽  
Surface Layout ◽  
Gust Load Alleviation

scholarly journals Optimal Control Surface Layout for an Aeroservoelastic Wingbox

AIAA Journal ◽  
2017 ◽  
Vol 55 (12) ◽  
pp. 4347-4356 ◽  
Author(s):  
Bret K. Stanford
Keyword(s):  
Optimal Control ◽  
Control Surface ◽  
Surface Layout

Computational analysis on actuator failures of flexible aircraft

2018 ◽  
Vol 07 (01n02) ◽  
pp. 1850014
Author(s):  
Shi-Bin Yang ◽  
Li-Bao Wang ◽  
Dan Xu
Keyword(s):  
Coupled Model ◽  
Control Surface ◽  
Loss Of Function ◽  
Hydraulic Actuator ◽  
Actuator Failures ◽  
Failure Loads ◽  
Rigid Body Modes ◽  
Elastic Modes ◽  
Gust Load Alleviation ◽  
And Control

A coupled model of aeroservoelasticity and hydraulic actuator used for failure simulation is presented. The mathematical model composites rigid-body modes, elastic modes, control surface modes, unsteady aerodynamic forces and failure models (jam, loss of control (LOC), oscillatory failure, and hydraulic fluid leakage). A clear framework of coupling method of airplane aeroelastic equation and control surface dynamic equation is provided to study the impacts of surface failures on rigid-elastic motion of airplane. The coupled model is shown to be effective in evaluation of gust response in both discrete gust and continuous turbulence conditions compared with results obtained from the 3-order simplified actuator. Examples of gust load alleviation (GLA) system with LOC of ailerons are given. Results show that total loss of function of GLA system is caused by the LOC. With continuous turbulence excitation, the failure loads is several times larger than that without GLA system.

scholarly journals Identification and assessment of a nonlinear dynamic actuator model for controlling an experimental flexible wing

2021 ◽  
Author(s):  
Martin Tang ◽  
Marc Böswald ◽  
Yves Govers ◽  
Manuel Pusch
Keyword(s):  
Nonlinear Dynamic ◽  
Closed Loop ◽  
Control Surface ◽  
Parameter Study ◽  
Actuator Dynamics ◽  
Flexible Wing ◽  
Describing Functions ◽  
The Individual ◽  
Gust Load Alleviation ◽  
The Impact

AbstractIn this paper, the effect of nonlinear actuator dynamics on the performance of an active load alleviation system for an experimental flexible wing is studied. Common nonlinearities such as backlash or rate limits are considered for the control surface actuator. An aeroelastic simulation model of a flexible wing with control surface is being used. With this, a parameter study is carried out to quantify the impact of the individual nonlinearities on the overall closed-loop performance by means of describing functions. Finally, the nonlinear actuator model with parameters identified from dedicated tests is experimentally validated allowing for an accurate prediction of the expected gust load alleviation performance.

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).

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
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