Browsing by Author "Pecht, M.G."

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    Computer Aided Printed Circuit Design.
    (1987) Sawyer, B.T.; Pecht, M.G.; ISR
    This paper presents some of the engineering and programming developments wtuch have resulted from the University of Maryland RAMCAD (Reliability and Maintainability using Computer Aided Design) effort for printed circuit boards (PCBs) and wiring assemblies (PWA)s. The paper overviews some of the problems associated with the PCB design process, examines the present status of computer aided PCB design, and then dicusses the development of the University of Maryland RAMCAD system and the methods used to program for goal oriented design.
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    Optimized Redundancy Allocation for Electronic Equipment.
    (1987) Pecht, M.G.; Azarm, Shapour; Praharaj, S.Y.; ISR
    This paper describes a methodology for optimizing the temperature dependent reliability of electronic equipment using active redundancy, while satisfying an area constraint. The process consists of transforming the objective unreliability function by adding to it a suitable penalty term so as to force the optimum solution to an almost integer" value, and minimizing the transformed objective function by a sequential quadratic programming technique. A sensitivity analysis, which avoids "perturb-and-reoptimize" methods, is then conducted to show how an incremental change in an input parameter affects the optimum solution.