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Man-machine interactive system simplifies computer-aided circuit design
Langley interactive computerized circuit analysis capability /LICCA/ enables designer to draw electronic circuit diagrams on cathode ray tube screen. This information is submitted as input to user-selected circuit analysis program. LICCA accommodates binary logic circuits and circuits with discrete components, and monitors operator's instructions to detect errors.
Utilization of a CRT display light pen in the design of feedback control systems
A hierarchical structure of the interlinked programs was developed to provide a flexible computer-aided design tool. A graphical input technique and a data structure are considered which provide the capability of entering the control system model description into the computer in block diagram form. An information storage and retrieval system was developed to keep track of the system description, and analysis and simulation results, and to provide them to the correct routines for further manipulation or display. Error analysis and diagnostic capabilities are discussed, and a technique was developed to reduce a transfer function to a set of nested integrals suitable for digital simulation. A general, automated block diagram reduction procedure was set up to prepare the system description for the analysis routines.
Micropower active filters for vhf applications
High Q micropower filters for VHF applications based on conditionally stable negative resistance operation, describing computer-aided design, construction and performance
Computer-aided electronic circuit design, part I. Conduction processes in thin films, part II Status report, 1 Jun. - 30 Nov. 1965
Computer-aided electronic circuit design, and conduction processes in thin films
Computer-aided electronic circuit design, part I. Conduction processes in thin films, part II Status report, Jun. 1 - Nov. 30, 1966
Computer-aided electronic circuit design and conduction processes in thin films
An annotated bibliography of computer-aided circuit analysis and design
Annotated bibliography of computer-aided circuit analysis and design
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-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
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
Computer-aided electronic circuit design Status report, 1 Jul. - 30 Nov. 1968
Systems analysis in on-line computer assisted network, simulation, and circuit design
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
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-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
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.
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 Circuit Analysis Semiannual Report, May 15 - Nov. 14, 1966
Digital computer aided circuit analysis and design
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