Views on general systems story

198 p., fig

An analysis of the automatic control of multiple capacity systems

Thesis: Sc. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1942Vita.Includes bibliographical references (leaves 212-214).by John Anthony Hrones.Sc. D.Sc. D. Massachusetts Institute of Technology, Department of Mechanical Engineerin

Recent Investigations in Plastic Torsion

Abstract Tension, double-shear, and torsion tests on cast iron, S.A.E. 1045 annealed steel, and S.A.E. 1112 annealed steel are described in which the quantitative relations between the so-called modulus of rupture, double shear strength, and actual maximum shear stress in the bar at fracture are given for each material. The shear stress distribution over the cross section of each bar at fracture is also determined. Further, the data obtained from tension and torsion tests on the two steels are plotted on a single set of coordinates, namely the octahedral shearing stress τn and the octahedral shearing strain γn. A reasonable check is obtained between the two curves when the shear strain is less than that corresponding to the tensile strength. Finally, there is described a series of plastic-torsion tests on bars of mild steel with various new cross sections of practical interest, namely, the splined shaft, the circular shaft with two shallow rectangular keyways, double- and four-lipped drills, and I-beams. In these tests, the regions of initial yielding are determined by means of the Fry etching method.</jats:p

Defining global requirements with distributed QFD

Obtaining valid data on customer needs and translating it into optimum product functionality is always a challenge, but especially so when the customers are geographically, culturally, and functionally diverse. Digital&apos;s Corporate Telecommunications Software Engineering (CTSE) used groupware techniques supported by the distributed use of Quality Function Deployment (QFD) to identify product features that meet customer needs. By linking engineers, customers, and product personnel from across the globe, CTSE redesigned the QFD model to optimize the use of local and global groups in defining product requirements. During one year, three software products, including Automatic Callback version 2.1, were defined using the Distributed Quality Function Deployment (DQFD) technique. Lessons learned from each interactive session were applied to continuously refine th