Determination of the toss speed for an automotive valve-gear system

Article Abstract:

This research presents an improved lumped-parameter model that combines favorably its simplicity and precision to represent appropriately an automotive valve-gear system, by means of the inclusion of a fluidic pressure element within the modeling of the hydraulic lifter, and by considering the hysteretic behavior of the pushrod under cyclic loading. Realistic values have been chosen for the parameters of this cam-follower mechanical system, and the checking of this modified mathematical model has been accomplished by means of a qualitative comparison with other models previously conceived, and with previous experimental results obtained from an automobile engine. The digital computer simulation allows the determination of cam speed for which the valve toss occurs, whose value is of fundamental importance in evaluating the design of automotive cam mechanisms. (Reprinted by permission of the publisher.)

Automobile industry, Motor vehicles, Digital Signals, Continuous Simulation, Scientific Research

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Simulating electric machine performance

Article Abstract:

This paper presents details of a computer program EMSP (Electric Machine Simulation Program), which provides the capability to simulate the steady state and dynamic performance of five fundamental devices: the transformer; the dc machine; the polyphase induction machine; the polyphase synchronous machine; and the single phase induction machine. A power factor correction analysis is also provided. EMSP constructs its machine simulation models from approximating functions derived from ANSI/IEEE/NEMA standards, from the author's own expertise, from information provided in manufacturer's application guides, and from user-provided data. (Reprinted by permission of the publisher.)

Systems analysis, Industrial research, Expert systems, Computer aided engineering, Electric motors, Research and Development, Software Packages, System Design, Simulation, Computer-Aided Engineering

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