Computer-aided electronic circuit design, part i. conduction processes in thin films, part ii status report, 1 dec. 1964 - 31 may 1965
Computer program for analyzing electronic circuits - Conduction processes in thin films
COMPUTER PROGRAM↗
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Computer-aided electronic circuit design. Conduction processes in thin films Status report, 1 Dec. 1965 - 31 May 1966
Computer aided electronic circuit design and conduction processes in thin films
THIN FILM↗
Computer-aided electronic circuit design, part 1. Thin film active device investigations, part 2 Status report, 1 Jun. - 30 Nov. 1967
Computerized electronic circuit design, and semiconductor thin film active devices
Source record↗
Computer-aided electronic circuit design Status report, 1 Jul. - 30 Nov. 1968
Systems analysis in on-line computer assisted network, simulation, and circuit design
Dertouzos, M. L.↗
Design analysis and computer-aided performance evaluation of shuttle orbiter electrical power system. Volume 2: SYSTID user's guide
The manual for the use of the computer program SYSTID under the Univac operating system is presented. The computer program is used in the simulation and evaluation of the space shuttle orbiter electric power supply. The models described in the handbook are those which were available in the original versions of SYSTID. The subjects discussed are: (1) program description, (2) input language, (3) node typing, (4) problem submission, and (5) basic and power system SYSTID libraries.
Source record↗
Design analysis and computer-aided performance evaluation of shuttle orbiter electrical power system. Volume 1: Summary
Studies were conducted to develop appropriate space shuttle electrical power distribution and control (EPDC) subsystem simulation models and to apply the computer simulations to systems analysis of the EPDC. A previously developed software program (SYSTID) was adapted for this purpose. The following objectives were attained: (1) significant enhancement of the SYSTID time domain simulation software, (2) generation of functionally useful shuttle EPDC element models, and (3) illustrative simulation results in the analysis of EPDC performance, under the conditions of fault, current pulse injection due to lightning, and circuit protection sizing and reaction times.
Source record↗
Design oriented structural analysis.
Recent developments in computer-aided structural design indicate a need for computerized structural analysis techniques which are efficient for the repetitive analysis of large complex structures undergoing design modifications. This paper describes such a technique based on a Taylor series approach. Results are presented for an idealized aircraft fuselage midsection to demonstrate the efficiency and accuracy of the technique. The results show that satisfactory analyses of modified structures may be obtained with the proposed technique, even for large changes in member sizes, for only a small fraction of the computational cost of a full reanalysis.
Storaasli, O. O.↗
Compensator growing and improving program Interim report, 1 Sep. 1970 - 31 Jan. 1971
Computer-aided compensator design program for increasing relative stability of control systems
Mitchell, J. R.↗
Industrial use of aerospace technology
Using a few selected examples of the sevral hundred successful transfers of aerospace technology to applications outside the aerospace field, it is shown that aerospace-related new technology does have many valuable nonaerospace uses. The examples presented include technology transfers to the machine tool and petroleum industries as well as to the fields of electric utilities and computer-aided structure design.
Burnett, J. E.↗
Computer-aided circuit analysis Annual report, 15 May 1966 - 15 Aug. 1967
Numerical methods, programs, and mathematical models for use in digital computer-aided circuit analysis and design
COMPUTER PROGRAMMING↗
Computer-aided inertial platform realignment in manned space flight.
Hardware design and functions of Apollo guidance and navigation system for inertial measurement unit realignment, outlining computer programs and routines
Hand, J. A.↗
Design synthesis of a boron/epoxy reinforced metal shear web.
An advanced composite shear web design concept has been developed for the Space Shuttle Orbiter main engine thrust beam structure. Various web concepts were synthesized by a computer-aided adaptive random search procedure. A practical concept is identified having a titanium-clad, boron/epoxy plate with vertical boron/epoxy reinforced stiffeners. Baseline composite and titanium shear resistant designs are compared; the composite concept is 28% lighter than the titanium web. Element test results show the metal cladding effectively reinforces critical composite load transfer and fastener hole areas making the composite web concept practical for other shear structure applications.-
Laakso, J. H.↗
Reliability estimation procedures and CARE: The Computer-Aided Reliability Estimation Program
Ultrareliable fault-tolerant onboard digital systems for spacecraft intended for long mission life exploration of the outer planets are under development. The design of systems involving self-repair and fault-tolerance leads to the companion problem of quantifying and evaluating the survival probability of the system for the mission under consideration and the constraints imposed upon the system. Methods have been developed to (1) model self-repair and fault-tolerant organizations; (2) compute survival probability, mean life, and many other reliability predictive functions with respect to various systems and mission parameters; (3) perform sensitivity analysis of the system with respect to mission parameters; and (4) quantitatively compare competitive fault-tolerant systems. Various measures of comparison are offered. To automate the procedures of reliability mathematical modeling and evaluation, the CARE (computer-aided reliability estimation) program was developed. CARE is an interactive program residing on the UNIVAC 1108 system, which makes the above calculations and facilitates report preparation by providing output in tabular form, graphical 2-dimensional plots, and 3-dimensional projections. The reliability estimation of fault-tolerant organization by means of the CARE program is described.
Mathur, F. P.↗
Evaluation of a metal shear web selectively reinforced with filamentary composites for space shuttle application. Phase 1 summary report: Shear web design development
An advanced composite shear web design concept was developed for the Space Shuttle orbiter main engine thrust beam structure. Various web concepts were synthesized by a computer-aided adaptive random search procedure. A practical concept is identified having a titanium-clad + or - 45 deg boron/epoxy web plate with vertical boron/epoxy reinforced aluminum stiffeners. The boron-epoxy laminate contributes to the strength and stiffness efficiency of the basic web section. The titanium-cladding functions to protect the polymeric laminate parts from damaging environments and is chem-milled to provide reinforcement in selected areas. Detailed design drawings are presented for both boron/epoxy reinforced and all-metal shear webs. The weight saving offered is 24% relative to all-metal construction at an attractive cost per pound of weight saved, based on the detailed designs. Small scale element tests substantiate the boron/epoxy reinforced design details in critical areas. The results show that the titanium-cladding reliably reinforces the web laminate in critical edge load transfer and stiffener fastener hole areas.
Laakso, J. H.↗
Smart Process Planning for Automated Fiber Placement
Many industries, including aerospace, automotive, wind energy, maritime, and sporting goods, rely on strong, lightweight materials called composites. These materials are made by layering fibers, which can come in the form of narrow strips or wider sheets, and setting them in a polymer matrix. One of the most advanced ways to make these parts is through automated fiber placement, where a machine lays down the fibers in precise patterns. This method can create very efficient and strong designs, but it is complex, expensive, and often depends heavily on the experience of skilled engineers. Today, the design, manufacturing, and inspection stages of composite production are usually handled separately. This separation means that important information, such as how a part will be built or what defects might occur, is not always shared between stages. As a result, parts may not be as lightweight, strong, or defect-free as possible, and the process can take longer and cost more. This research develops a smart process planning system that connects design, manufacturing, and inspection into one continuous process. Built as software that works with existing tools, the system can automatically plan how the fibers are placed, predicting and reducing defects while improving both manufacturability and strength. The system optimizes not only individual layers but also how defects are distributed across all layers, preventing them from stacking up in ways that weaken the final part. It also uses inspection results from completed parts to improve future designs, creating a feedback loop where each stage informs the others. The system was tested by designing a composite panel using this new approach and comparing it to a panel made with state-of-the-art manual planning methods. The results showed that the system could intentionally control where defects appeared and increase the efficiency of the planning process. By unifying design, manufacturing, and inspection, this research shows a way to make advanced composite manufacturing more efficient, consistent, and cost-effective. This approach lowers the barrier to using automated fiber placement and opens the door for its wider adoption not only in aerospace but also in industries such as automotive, wind energy, maritime, and sporting goods, where strong and lightweight structures are essential.
Computer-Aided Process Planning↗
Computer-aided Circuit Analysis Semiannual Report, May 15 - Nov. 14, 1966
Digital computer aided circuit analysis and design
NETWORK ANALYSIS↗
Complementary MOS-FET NAND gate modeling for computer-aided transient analysis
Nonlinear model of field effect transistor for computer aided transient analysis of complementary metal oxide semiconductor-field effect transistor NAND gate
LOGICAL DESIGN↗
Computer-aided CO2 laser cavity-length selection for reduced line competition
The advantages of carbon dioxide lasers for space communications systems are considered. An attempt was made to predict the signature of CO2 lasers. It was found that this requires accurate data on the laser wavelengths (accuracy on the order of 10 MHz). The results of absolute frequency measurements of CO2 lines were utilized, and a list of accurate frequencies was calculated. A computer program was written for the signature prediction. A second program was written which searches through large ranges of cavity length and prints lists of regions where a particular line is well separated from adjacent lines in the signature. Lasers designed according to this list will have an undisturbed tuning profile for one or more lines.
Schiffner, G.↗