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针对重装空投过程的飞机运动系统，考虑气动数据的测量和计算误差等不确定性，提出了带有自适应函数近似的反步滑模控制方法。首先将系统的复杂非线性不确定性分解为不确定参数向量和已知非线性矩阵，降低了控制器的设计难度，在此基础上，设计自适应算法近似不确定参数向量，并将自适应结果补偿到反步滑模控制器中，解决了滑模切换增益的选取依赖于系统不确定性边界的问题。理论分析表明，该方法能够保证飞机速度和俯仰角的跟踪误差...
Theoretical Background for Aerodynamic Shape Optimization
Theoretical Background Aerodynamic Shape Optimization
2015/7/3
This is the first of three lectures prepared by the authors for the von Karman Institute that deal with the subject of aerodynamic shape optimization. In this lecture we introduce some theoretic...
A Systematic Study on the Impact of Dimensionality for a Two-Dimensional Aerodynamic Optimization Model Problem
Systematic Study Impact Dimensionality Two-Dimensional Aerodynamic Optimization Model Problem
2015/7/3
A model problem, based on the NACA0012 airfoil, is studied. The thickness distribution of the symmetric NACA0012 airfoil is optimally approximated with a 4th-order Bezier curve. This best-fit ap...
Enhancement of a Class of Adjoint Design Methods via Optimization of Parameters
Enhancement Adjoint Design Methods Optimization Parameters
2015/7/3
INCE the adjoint method was introduced to aerodynamic shape optimization in 1980s [1,2], this method has become a popular choice for design problems involving fluid flow and has been succe...
A Pilot Project in Preparation of an Aerodynamic Optimization Workshop with Lessons Learned
Pilot Project Preparation Aerodynamic Optimization Workshop Lessons Learned
2015/7/2
This paper is an addendum to a recent publication on a Comparative Study of 3D Wing Drag Minimization by Different Optimization Techniques; with a focus on a path forward towards the development of a ...
Comparative Study of 3D Wing Drag Minimization by Different Optimization Techniques
3D Wing Drag Minimization Diff erent Optimization Techniques
2015/7/2
The main goal of this paper is to document a comparative study of different CFD based optimization techniques applied to the so lution of a 3D wing drag minimization problem.
One-shot pseudo-time method for aerodynamic shape optimization using the Navier–Stokes equations
aerodynamic shape optimization simultaneous pseudo-time stepping Navier–Stokes equations
2015/7/2
This paper presents a numerical method for aerodynamic shape optimization problems in compressible viscous flow. It is based on simultaneous pseudo-time stepping in which stationary states are o...
Aerodynamic Shape Optimization Part II:Sample Applications
Aerodynamic Shape Optimization Sample Applications
2015/7/2
This is the second of two lectures prepared by the authors for the von Karman Institute that deal with the subject of aerodynamic shape optimization.
Aerodynamic Shape Optimization Part I: Theoretical Background
Aerodynamic Shape Optimization Theoretical Background
2015/7/2
This is the first of two lectures prepared by the authors for the von Karman Institute that deal with the subject of aerodynamic shape optimization.
Aerodynamic Shape Optimization for the World's Fastest P-51
Aerodynamic Shape Optimization World's Fastest P-51
2015/7/2
In this paper, an Adjoint-based automatic design methodology has been applied to redesign the wing of the P51 \Dago Red", an aircraft competing in the Reno Air Races.
Aerodynamic Simulation and Shape Optimization for High Speed Flow
Aerodynamic Simulation Shape Optimization High Speed Flow
2015/7/2
In this paper we review the development of aerodynamic simulation and shape optimization techniques which had their inception in Princeton during the early eighties, when Seymour M. Bogdonoff wa...
Since the present author rst became involved in computational uid dynamics, around 1970, the land scape has changed dramatically. At that time, panel methods had just come into use, and the world's f...
The focus of CFD applications has shifted to aerodynamic design. This shift has been mainly motivated by the availability of high performance computing platforms and by the development of new and eci...
AERODYNAMIC SHAPE OPTIMIZATION:EXPLORING THE LIMITS OF DESIGN
AERODYNAMIC SHAPE OPTIMIZATION EXPLORING LIMITS DESIGN
2015/7/2
This paper discusses the role that computational fluid dynamics (CFD) plays in the design of aircraft. An overview of the design process is provided, covering some of the typical decisions that ...
CFD for Aerodynamic Design and Optimization:Its Evolution over the Last Three Decades
CFD Aerodynamic Design Optimization Evolution Last Three Decades
2015/7/2
The AIAA First Computational Fluid Dynamics Conference, held in Palm Springs in July 1973, signified the emergence of computational fluid dynamics (CFD) as an accepted tool for airplane de...