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Determination of stress intensity factors in c cracked plates by the finite element method
Krishnamoorthy, C. S. and Yu. C W. 74.17 'Simplified computer approach to the ultimate load analysis and design of reinforced concrete frames', Arner. Concr. Inst. J., Vol 69, (1972) No 11, pp 6 9 0 - 8 Presentation of a computer program for the five different cases of hinge pattern under two ultimate loading conditions. A modified simplified limit method by Baker is proposed.
Nielson, R. and Orang, P.Y. 74.18 'Structural analysis of longitudinally framed ships', Ship Structure Committee, Coastguard HQ, Washington DC, USA (1972) 60pp N-00024-70-C-5219 The method combines the advantages of the finite element technique and uncoupling by co-ordinate transformation. A fine mesh can be used to produce more accurate boundary conditions. The transformations also reduce the computer time to about onetenth of that by other methods. Three computer programs are discussed: one for longitudinal strength analysis, one for transverse strength analysis and a third for the local stability check of the structure.
Raft, A.I. 74.19 'Program SCORES - Ship structural response in waves' Ship Structure Committee, Coastguard HQ, Washington DC, USA (1972) 68pp N-0002470-C-5076 FR The SCORES program calculates both the vertical and lateral plane motions and applied loads to a ship in waves. Strip theory is used and each ship hull crosssection is assumed to be of Lewis form to calculate hydrodynamic forces. Both regular and irregular wave results can be obtained and the ship can be at any heading relative to the wave's direction. All three primary ship hull loadings are computed.
Schroeder, M.R. 74.20 'Computer models for concert hall acoustics', Am. J. Phys., Vol 41, No 4 (April 1973) pp 461--471 Recent applications are described of computer model studies to the design of concert halls together with new methods of quantifying personal preference and subjective quality. These methods show promise in making the acoustics of future hall designs more predictable and satisfactory.
Yamamoto, Y. and Tokuda, N. 74.21 'Determination of stress intensity factors in cracked plates by the finite element method', Int. J. Nuraerical Metbods in Eng., Vol 6 (1973) pp 427--439 Stress fields near crack tips in an elastic body can be specified by the stress intensity factors. These factors relate closely to the stress singularities arising from the crack tips but they cannot be exactly represented by conventional finite element models. This method is based on the superposition of analytical and finite element solutions. Several two-dimensional problems are considered and the numerical solutions are in close agreement with analytical ones. A coarse mesh subdivision still provides sufficiently accurate results but with considerably reduced computational effort.
Volume 6 Number 1 January 1974
Electronic and Electrical
engineering
Abos, I., Reval, I. and Stehanrski 74.22 'KONSTR-I: Computer-aided design of printed circuit plates and hybrid integrated circuits' Proc. o f the Res. Inst. for Telecommun., Vol 17, (1972), No 3, pp 15-23 Apperley, M.D. 74.23 'Ergonomics considerations for a circuit design system', Colloquium Digest on Interactive Graphics in Circuit Design, Inst. Elect. Eng., London, England. 26th February 1973 The paper presents some ideas concerning man/machine communication for a circuit design system in an interactive graphics environment. Boranyi, A. 74.24 'Recent trends in computer aided circuit design' proc. of tbe Res. Inst. for Telecommun., Vol 17, (1972), No 3, pp 15--23 Boardman, J. T. and Wilde, IL J. 74.25 'Interactive design of electricity distribution networks', Proc. Inst. Electr. Eng., Vol 120. No 9 (September 1973) pp 1006-1011 A computer display method is described for interactive design of electricity distribution networks. Visual communications provides high-speed output of results and a wide range of operating conditions. The method provides both a.c. and d.c. load-flow programs and fanlt-level analysis could be provided quite simply. A 22-node network is given as an example, having a d.c. load flow computation time of less than 9s. The short computation times suggest that the method can be applied to much larger networks. Darwood, N. 74.26 'Flow diagrams aid computer hardware design', Electron. Eng., Vol 45, No 541 (March 1973) pp 69-71 A control system illustrates the way in which flow diagrams can assist in devising the sequential hardware for computer control circuits and counters.
Derviso glu, B. 74.27 'Computer aided logic design', Colloquium digest on 'Interactive Graphics in Circuit Design', London England (26th February 1973), IEE Publication Three programs are described for specifying a logic system in a high level and then to simulate it. The work is performed on a PDP-7 and 340 display and light-pen and they are attached to a DEC PDP-10 timesharing computer through a high-speed parallel link.
Kahn, H. J. and May, J. W.R. 74.28 'Use of logic simulation in the design of large computer systems', Radio and Electr. Eng., Vol 43, No 8 (August 1973) pp 497-503 Lloyd, R. D. and Rudd, D.A. 74.29 'Computer optimization of linear a.c. circuits', Mullard Res. Labs., UK. Presented
at Annual Rev. (1972) 5pp A program called LINOPT has been written for optimizing the component values in a general linear a.c. circuit to meet the required response specifications. The resulting design is optimal whether or not the specifications are met.
Marovac, N. 74.30 'A single data-display structure: A new view on interactive computer graphics in c.a.d.', Comput. J., Vol 16, No 2 (May 1973) pp 152--156 A data-display structure has been implemented for a suite of programs for general network analysis using interactive graphics. The basic concepts of display files and data and display structures are reviewed. The paper describes a network built on the screen in full pictorial, constitutive and topological details, thus enabling the display of the network and the construction of various network matrices that are required by different analysis programs. Morlzumi, Y. 74.31 'Computer-aided design of an axially symmetrical magnetic circuit and its application to electron-beam focusing devices', IEEE Trans. Vol ED-19, No 6 (June 1972) pp 782-797 A method of computer simulation is presented for the analysis of an axially symmetrical magnetic circuit with existing coils, magnetic poles and permanent magnets. The vector magnetic potential is determined by applying the successive overrelaxation method, so that devices having magnetic hysterises characteristics can be analysed effectively. The program accounts for the magnetization intensity distribution within the magnet. Oberst, E. 74.32 'Computer design of digital automatic equipment', Automatizace No 1 (1973) pp 14--16 (in Czech) The paper reviews the requirements of a system of programs for computer design of digital equipment. Practical logic design of combinatorial switching systems requires approximation methods. This means that sub-optimal solutions are produced with a reasonable computer time requirement.
Paul, D.H. 74.33 'Drawing microwave printed circuit masks by computer', Mullard Res. Laboratories, UK. Presented at Annual Rev. (1972) 3pp It is necessary to define the pattern coordinates at the layout stage in the production of masked printed circuits. N.C. drawing machines enable the final cutting to be performed automatically, but the designer still has to calculate the co-ordinates and prepare the data in suitable format. Several programs have been written to assist in this task.
Sheets, L.R.
74.34 'Input/output techniques for computerized hybrid microcircuit mask making', Bendix Tecb. J., Vol 5, No 3 (Winter 1972) pp 41--46 The paper considers input/output techniques that have been developed to help the
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Nielson, R. and Orang, P.Y. 74.18 'Structural analysis of longitudinally framed ships', Ship Structure Committee, Coastguard HQ, Washington DC, USA (1972) 60pp N-00024-70-C-5219 The method combines the advantages of the finite element technique and uncoupling by co-ordinate transformation. A fine mesh can be used to produce more accurate boundary conditions. The transformations also reduce the computer time to about onetenth of that by other methods. Three computer programs are discussed: one for longitudinal strength analysis, one for transverse strength analysis and a third for the local stability check of the structure.
Raft, A.I. 74.19 'Program SCORES - Ship structural response in waves' Ship Structure Committee, Coastguard HQ, Washington DC, USA (1972) 68pp N-0002470-C-5076 FR The SCORES program calculates both the vertical and lateral plane motions and applied loads to a ship in waves. Strip theory is used and each ship hull crosssection is assumed to be of Lewis form to calculate hydrodynamic forces. Both regular and irregular wave results can be obtained and the ship can be at any heading relative to the wave's direction. All three primary ship hull loadings are computed.
Schroeder, M.R. 74.20 'Computer models for concert hall acoustics', Am. J. Phys., Vol 41, No 4 (April 1973) pp 461--471 Recent applications are described of computer model studies to the design of concert halls together with new methods of quantifying personal preference and subjective quality. These methods show promise in making the acoustics of future hall designs more predictable and satisfactory.
Yamamoto, Y. and Tokuda, N. 74.21 'Determination of stress intensity factors in cracked plates by the finite element method', Int. J. Nuraerical Metbods in Eng., Vol 6 (1973) pp 427--439 Stress fields near crack tips in an elastic body can be specified by the stress intensity factors. These factors relate closely to the stress singularities arising from the crack tips but they cannot be exactly represented by conventional finite element models. This method is based on the superposition of analytical and finite element solutions. Several two-dimensional problems are considered and the numerical solutions are in close agreement with analytical ones. A coarse mesh subdivision still provides sufficiently accurate results but with considerably reduced computational effort.
Volume 6 Number 1 January 1974
Electronic and Electrical
engineering
Abos, I., Reval, I. and Stehanrski 74.22 'KONSTR-I: Computer-aided design of printed circuit plates and hybrid integrated circuits' Proc. o f the Res. Inst. for Telecommun., Vol 17, (1972), No 3, pp 15-23 Apperley, M.D. 74.23 'Ergonomics considerations for a circuit design system', Colloquium Digest on Interactive Graphics in Circuit Design, Inst. Elect. Eng., London, England. 26th February 1973 The paper presents some ideas concerning man/machine communication for a circuit design system in an interactive graphics environment. Boranyi, A. 74.24 'Recent trends in computer aided circuit design' proc. of tbe Res. Inst. for Telecommun., Vol 17, (1972), No 3, pp 15--23 Boardman, J. T. and Wilde, IL J. 74.25 'Interactive design of electricity distribution networks', Proc. Inst. Electr. Eng., Vol 120. No 9 (September 1973) pp 1006-1011 A computer display method is described for interactive design of electricity distribution networks. Visual communications provides high-speed output of results and a wide range of operating conditions. The method provides both a.c. and d.c. load-flow programs and fanlt-level analysis could be provided quite simply. A 22-node network is given as an example, having a d.c. load flow computation time of less than 9s. The short computation times suggest that the method can be applied to much larger networks. Darwood, N. 74.26 'Flow diagrams aid computer hardware design', Electron. Eng., Vol 45, No 541 (March 1973) pp 69-71 A control system illustrates the way in which flow diagrams can assist in devising the sequential hardware for computer control circuits and counters.
Derviso glu, B. 74.27 'Computer aided logic design', Colloquium digest on 'Interactive Graphics in Circuit Design', London England (26th February 1973), IEE Publication Three programs are described for specifying a logic system in a high level and then to simulate it. The work is performed on a PDP-7 and 340 display and light-pen and they are attached to a DEC PDP-10 timesharing computer through a high-speed parallel link.
Kahn, H. J. and May, J. W.R. 74.28 'Use of logic simulation in the design of large computer systems', Radio and Electr. Eng., Vol 43, No 8 (August 1973) pp 497-503 Lloyd, R. D. and Rudd, D.A. 74.29 'Computer optimization of linear a.c. circuits', Mullard Res. Labs., UK. Presented
at Annual Rev. (1972) 5pp A program called LINOPT has been written for optimizing the component values in a general linear a.c. circuit to meet the required response specifications. The resulting design is optimal whether or not the specifications are met.
Marovac, N. 74.30 'A single data-display structure: A new view on interactive computer graphics in c.a.d.', Comput. J., Vol 16, No 2 (May 1973) pp 152--156 A data-display structure has been implemented for a suite of programs for general network analysis using interactive graphics. The basic concepts of display files and data and display structures are reviewed. The paper describes a network built on the screen in full pictorial, constitutive and topological details, thus enabling the display of the network and the construction of various network matrices that are required by different analysis programs. Morlzumi, Y. 74.31 'Computer-aided design of an axially symmetrical magnetic circuit and its application to electron-beam focusing devices', IEEE Trans. Vol ED-19, No 6 (June 1972) pp 782-797 A method of computer simulation is presented for the analysis of an axially symmetrical magnetic circuit with existing coils, magnetic poles and permanent magnets. The vector magnetic potential is determined by applying the successive overrelaxation method, so that devices having magnetic hysterises characteristics can be analysed effectively. The program accounts for the magnetization intensity distribution within the magnet. Oberst, E. 74.32 'Computer design of digital automatic equipment', Automatizace No 1 (1973) pp 14--16 (in Czech) The paper reviews the requirements of a system of programs for computer design of digital equipment. Practical logic design of combinatorial switching systems requires approximation methods. This means that sub-optimal solutions are produced with a reasonable computer time requirement.
Paul, D.H. 74.33 'Drawing microwave printed circuit masks by computer', Mullard Res. Laboratories, UK. Presented at Annual Rev. (1972) 3pp It is necessary to define the pattern coordinates at the layout stage in the production of masked printed circuits. N.C. drawing machines enable the final cutting to be performed automatically, but the designer still has to calculate the co-ordinates and prepare the data in suitable format. Several programs have been written to assist in this task.
Sheets, L.R.
74.34 'Input/output techniques for computerized hybrid microcircuit mask making', Bendix Tecb. J., Vol 5, No 3 (Winter 1972) pp 41--46 The paper considers input/output techniques that have been developed to help the
51