Browsing by Author "Palmer, M."
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Item A Computer Aided Engineering Program for Coplanar and In-Line Printed Wiring Board Thermal and Thermal Reliability Analysis.(1985) Pecht, M.; Palmer, M.; ISRThis report is a review of the cooperative: Westinghouse University of Maryland, Mechanical Engineering, computer-aided design (CAD) of a printed wiring board (PWB) project. In earlier cooperation (1984) with Westinghouse, an interface link was developed between the computer-aided PWB layout and routing routine (RECAL-REDAC) and a thermal analysis routine. A CAD program, called MTEMP resulted, which performs a thermal analysis for in-line PWB's without the requirements of "hand" scaling and node shifting used by previous programs, eliminates much of the I/O by providing a direct link with REDAC, and provides an accurate graphical model of the PWB. Finally, to control development cost and conform to copyrights, MTEMP does not alter REDAC. Our research effort over the 1985 year consisted of developing a coplanar thermal analysis program , a thermal reliability analysis program which was integrated into a user friendly printed wiring board design program. In addition heat dissipation input for each component can now be manually entered or can be accessed from the working database. A component database shell was developed that will aid in the thermal , reliability analysis , can be called from any routine as needed. This solves one of the past limitations in that there was no reference from the PWB components to the actual part numbers.Item Indirective Random Optimal Component Placement.(1986) Wong, Y.T.; Palmer, M.; Pecht, M.; ISRPresented is a new efficient method for the placement of components on a printed wiring board (PWB). In order to obtain shortest total wire length, all nets are considered as randomly connected minimum Steiner trees. A random optimal net process theory is used to eliminate redundant comparison and an indirective optimal technique is used to avoid calculating the exact length of minimum Steiner trees in the iterative process.Item Random Optimal Net Oriented PWB Design Automation.(1986) Wong, Y.T.; Pecht, M.; Palmer, M.; ISRPresented is a new automated design approach for the net initial assignment, placement and routing of components on a printed wiring board (PWB). In order to obtain shortest total wire length, all nets under consideration are randomly connected as minimum Steiner trees in every process. The random optimal net process theory is used to eliminate redundant comparisons and the indirective optimal technique is wed to avoid calculating the exact length of minimum Steiner trees in the iterative process. Thus complex PWBs can be designed more efficiently. In the routing process, a modified Lee's algorithm is used to build the minimum spanning trees related to the minimum Steiner trees imagined in the placement process and search proper channels for the Steiner trees in terms of the minimum spanning trees.Item Work station Requirements for Printed Wiring Boards.(1986) Pecht, M.; Naft, J.; Palmer, M.; ISRThis article presents an overview of the requirements of workstations which are used in the design of printed wiring boards (PWBs). Weaknesses in the current usage of workstations in the design process are discussed and a solution is suggested whereby functionally specific clustered workstations are tied to an intelligent working data base to form a workstation environment tailored to the engineering design process.