scholarly journals URSULA2 computer program. Volume 1. Mathematical formulation and solution procedure. Final report. [PWR]

1980 ◽  
Author(s):  
A. Singhal ◽  
D. Spalding
Keyword(s):  
Computer Program ◽  
Mathematical Formulation ◽  
Solution Procedure ◽  
Final Report

Computer Aided Analysis of High-Speed Single Row, Spherical Roller Bearings and Comparison With Full-Scale Test Results

1993 ◽  
Author(s):  
A. K. Aggarwal ◽  
D. M. Michaels ◽  
C. H. Keller
Keyword(s):  
Computer Program ◽  
High Speed ◽  
Mathematical Formulation ◽  
Roller Bearing ◽  
Full Scale ◽  
Full Scale Test ◽  
Operating Characteristics ◽  
Single Row ◽  
Roller Bearings ◽  
Scale Test

Abstract Single row, angular contact, spherical roller bearings were designed, analyzed, and tested to study their feasibility in a high speed (1.15 million DN) spiral bevel input pinion application. A mathematical formulation, modeling the mechanics of internal motions, load and stress distributions, lubricant flow, sliding friction, heat generation and heat transfer, was developed to analyze the bearing performance and predict operating characteristics. An interactive computer program, capable of running on a DOS PC, was then developed to solve the bearing model for the given parameters of geometry, materials, loads, and speed. The computer program, named SASHBEAN (Sikorsky Aircraft Spherical Roller High Speed Bearing ANalysis), also provided the capability of “lumped capacity” thermal analyses of the bearing and its supporting mechanical system. Six test bearings, conforming to a 216 cylindrical roller bearing OD (140 mm) and ID (80mm), were manufactured using Carpenter Pyrowear® Alloy 53 steel rings. Both conventional (with steel rollers) and hybrid (with silicon nitride rollers) configurations were built and tested under different setup conditions of loads (radial and axial), speed, and lubrication. Excellent correlation was found between the full scale test data and the computer analyses results. The analysis also provides an excellent comparison of the performance characteristics of an hybrid bearing with those of an “all steel” bearing for this high speed transmission application.

Partitioning Tasks to Product Development Teams

2002 ◽  
Author(s):  
Dan Braha
Keyword(s):  
Product Development ◽  
Mathematical Formulation ◽  
Solution Procedure ◽  
Solution Technique ◽  
Design Teams ◽  
Complex Engineered Systems ◽  
Development Teams ◽  
Engineered Systems ◽  
The Cost ◽  
Product Development Teams

The principle of partitioning tasks among product development teams so as to minimize the cost of interactions across design teams is an important characteristic of complex engineered systems. Although there is growing literature that deals with the proper organization of product development tasks, little attention is given to rigorous modeling of the phenomena. To fill the void, we present a mathematical formulation for the problem. Two main issues are addressed by the model: 1) how to specify task dependencies, and 2) how to optimally partition the tasks among a number of teams. Characteristics of the problem are analyzed, and an efficient solution procedure is proposed. The developed model and solution technique can be applied to various scales of the product design and development process, and may open a variety of interesting questions.

Gauging Children’s Understanding of Artificially Intelligent Objects: A Presentation of “Counterfactuals”

1998 ◽  
Vol 22 (4) ◽  
pp. 871-889 ◽  
Author(s):  
Mike Van Duuren ◽  
Barbara Dossett ◽  
Dawn Robinson
Keyword(s):  
General Solution ◽  
Computer Program ◽  
Comparison Group ◽  
Solution Procedure ◽  
Accurate Assessment ◽  
The Difference

Children aged 5 to 11 years and a comparison group of adults were presented with two instances where the behaviour of a computational object was contrary to what might normally be expected of such a device. In both instances findings are discussed with regard to children’s understanding of a computer program and resulting computational behaviour generally. In the first study, children viewed a ”lm featuring a number of robots either acting as traditionally programmed devices or, alternatively, with apparent intentionality. We examine to what extent, if at all, children were aware of this difference. Findings indicated that although the younger children mentioned other alleged differences between the robots, the issue of different loci of control was not a salient one. In the second study, children were encouraged to type two kinds of questions into a computer. The first kind (simple maths questions) required a general solution procedure commonly accessible to a computational object. The second (details of a biographical nature) did not. With respect to the first as well as the second kind of questions the computer was seen to provide apparently correct answers. Findings showed that although with increasing age children were better at articulating the difference between rote- and rule-generated solutions generally, this was not generally accompanied by an accurate assessment of the kinds of problems that could normally be expected to be solved by a computer.

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