摘要:

AbstractAn iterative method is developed for designing symmetrical Joukowski airfoils of specified chord and maximum thickness. The method has been programmed for a digital computer and results for a particular airfoil design are given.

ISSN:0029-5981    

DOI:10.1002/nme.1620100402

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

ISSN:0029-5981    

DOI:10.1002/nme.1620100403

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThe purpose of this paper is to present refinements in a steepest descent algorithm for optimal design of structures and numerical experience that demonstrates its numerical efficiency. The algorithm is based on a state space optimization technique that was initially developed and applied to optimal control problems. Design constraints are divided into four distinct subsets, the special characteristics of which are exploited to improve computational efficiency of the algorithm. Some further improvements in structural analysis, design sensitivity analysis, and constrained steepest descent programming calculations are presented. Optimum designs for three test problems are obtained and convergence rates are compared with results presented in the literature.

ISSN:0029-5981    

DOI:10.1002/nme.1620100404

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThe coupled thermomechanical behaviour of a layer of thermorheologically simple material bonded to a uniformly rotating rigid cylinder and indented by another rigid cylinder is studied by the finite element method. The various approximations necessary to reduce the problem to one of tractable size and the computational methods used are discussed in some detail. The complete thermal, deformation and stress fields may be computed. Some results, computed for a grid using ‘rectangular’ elements, presented graphically include the temperature distribution, the stress distribution near the bond surface, the contact pressure distribution and the asymmetric surface deformation of the rubberlike la

ISSN:0029-5981    

DOI:10.1002/nme.1620100405

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractAn automatic algorithm is presented for reducing the bandwidth of symmetric sparse connectivity matrices. The procedure takes an arbitrary input sequence and creates an optimal bandwidth for complex network systems by renumbering the node labels. Thus, considerable improvement for computer storage and time is achieved in the solution of the systems.A large number of examples is presented to demonstrate the reliability and the efficiency of the method.

ISSN:0029-5981    

DOI:10.1002/nme.1620100406

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractA FORTRAN subroutine is presented which solves the system of simultaneous linear equations associated with the finite difference representation of the Poisson equation for rectangular or annular regions. The code is arranged to require minimum storage, and all possible operations involving known zeros and ones are suppressed. Single subscripting is employed to minimize execution time.

ISSN:0029-5981    

DOI:10.1002/nme.1620100407

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThis paper presents the formulations of essentially one‐dimensional least squares and Galerkin‐least squares finite elements for the numerical solution of two‐dimensional laminar boundary layer equations. An iterative technique to cope with the non‐linearity of the boundary layer equations, in conjunction with the least squares finite element method, is proposed. Through exhaustive numerical investigations in the retarded flow over a plate, flow past a circular cylinder, the flow past an elliptic cylinder, the accuracy and applicability of the proposed method are demon

ISSN:0029-5981    

DOI:10.1002/nme.1620100408

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

ISSN:0029-5981    

DOI:10.1002/nme.1620100409

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractA finite difference solution for the transient non‐linear heat conduction with phase change in a finite slab is proposed. A two‐time level implicit method is used while Taylor's forward projection method is employed for taking into account the non‐linearities. The stability due to the boundary conditions at the moving front is verified. The numerical solution is compared with the analytical solutions and found to be in close agre

ISSN:0029-5981    

DOI:10.1002/nme.1620100410

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractAn accurate reduction scheme for structural eigenvalue problems is deduced from a variational theorem in which the displacement, velocity and/or momentum fields are taken to be independent.

ISSN:0029-5981    

DOI:10.1002/nme.1620100411

出版商:John Wiley&Sons, Ltd    

年代:1976

数据来源: WILEY