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1.
Ohad Gur Manav Bhatia William H. Mason Joseph A. Schetz Rakesh K. Kapania Taewoo Nam 《Structural and Multidisciplinary Optimization》2011,44(2):277-298
The paper describes the development of a multidisciplinary design optimization framework for conceptual design of truss-braced
wing configurations. This unconventional configuration requires specialized analysis tools supported by a modular and flexible
framework to accommodate different configurations. While the previous framework developed at Virginia Tech was a monolithic
Fortran-77 code, the need for more flexibility for complex truss-braced wing configurations was addressed by the development
of this new framework, which is based on Phoenix Integration ModelCenterTM environment. The framework uses updated structural and aerodynamic design modules that enable a more general geometry definition.
The new framework, thus, provides a foundation for future design concepts, especially multi-member truss-braced wing configurations.
The fuel saving potential of these truss-braced wing configurations is presented by comparing different truss designs with
gradually increased level of complexity. 相似文献
2.
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4.
Transfer matrix models have been frequently used to analyze the structural behavior of rods, including curved and pretwisted ones. The advantages of these models include their relative simplicity, numerical efficiency and ease of implementation. Previous investigations did not include nonlinear analyses of curved rods that undergo large deformations. The present paper describes a nonlinear transfer matrix model of curved and pretwisted rods, which is capable of analyzing very large spatial deformations. The rod is divided into segments. A body system of coordinates is attached to each segment. This system translates and rotates with the segment during the deformation. If the segments are kept small enough, the local deformations of each segment, relative to its body system of coordinates, are small. The segments’ systems of coordinates rotate relative to their neighbors and if this rotation is dealt with properly, large rotations and displacement of the curved rod can be analyzed. In spite of its nonlinear nature, the model remains relatively simple and efficient. The new model is used to solve a few problems and the results show very good agreement with other analytical, finite-element, and experimental results. 相似文献
5.
Mordechai Shacham 《International journal for numerical methods in engineering》1986,23(8):1455-1481
The numerical solution of n non-linear algebraic equations with n unknowns, when any or all of the variables are subjected to constraints, is discussed. Distinction is made between physical and absolute constraints. It is shown, using a set of test problems, that solution of constrained equations does require a special approach. It is found that the step length restricted Newton's method performs best for problems with absolute constraints. Physical constraints can be best handled using a continuation method or penalty functions. 相似文献
6.
Yaniv Gelbstein Boaz Dado Ohad Ben-Yehuda Yatir Sadia Zinovy Dashevsky Moshe P. Dariel 《Journal of Electronic Materials》2010,39(9):2049-2052
The search for alternative energy sources is presently at the forefront of applied research. In this context, thermoelectricity
for direct energy conversion from thermal to electrical energy plays an important role. This paper is concerned with the development
of highly efficient p-type Ge
x
Pb1−x
Te alloys for thermoelectric applications, using spark plasma sintering. The carrier concentration of GeTe was varied by alloying
of PbTe and/or by Bi2Te3 doping. Very high ZT values up to ~1.8 at 500°C were obtained by doping Pb0.13Ge0.87Te with 3 mol% Bi2Te3. 相似文献
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8.
Convergence properties of a new iterative method for solution of non-linear equations are investigated. It is shown that for a system of equations which contain mixed linear equations and homogeneous functions of degree n, the convergence of this method is equivalent to the convergence of Newton's method. In contrast to the latter, this new method does not require evaluation of the vector of function values at every iteration. 相似文献
9.
We describe an electro-optical method of deciphering a watermark from a recently invented encoded image termed a concealogram. The watermark is revealed as a result of spatial correlation between two concealograms, one containing the watermark and the other containing the deciphering key. The two are placed side by side on the input plane of a modified joint-transform correlator. When the input plane is illuminated by a plane wave, the watermark image is reconstructed on part of the correlator's output plane. The key function deciphers the concealed watermark from the visible picture only when the two specific concealograms are matched. To illustrate the system's performance, both simulation and experimental results are presented. 相似文献
10.
Mordechai Shacham 《Computers & Chemical Engineering》1978,2(4):197-199
The solution of steady state chemical reactor models, using classic numerical methods, (like Newton-Raphson, Quasi-Newton, etc.), is often very difficult.
It is proposed to select constraints for the independent variables as the first step of the solution, then to use a combination of the Newton-Raphson and continuation methods, to obtain the solution, starting from a feasible initial guess.
Several methods for the solution of steady reactor models are compared. It is shown that the proposed method is the most reliable and efficient for locating the solution. 相似文献