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Synthesis of Stephenson's six-bar linkages by an interactive technique

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Sommario

E' riportata una tecnica per il progetto degli esalateri articolati piani di Stephenson, basata sull'impiego interattivo dell'elaboratore elettronico. E'noto che gli esalateri articolati, rispetto a meccanismi più semplici, consentono di soddisfare a richieste più sofisticate in certe applicazioni.

Il metodo di progetto proposto consiste nella ricerca di un opportuno punto di biella di un quadrilatero articolato piano, la cui traiettoria soddisfi a precise caratteristiche imposte dal movimento del cedente. Il meccanismo finale viene costruito a partire dal quadrilatero così ottenuto e viene analizzato automaticamente.

Vengono illustrati il metodo di analisi e il programma di calcolo. Quest'ultimo è stato implementato per un minicomputer e richiede essenzialmente la disponibilità di un video grafico interattivo.

Summary

An interactive approach to the computer aided synthesis of the planar Stephenson's six-bar linkages is reported. As known, in the applications, six-bar linkages may meet more sophisticated requirements than simpler mechanisms could allow.

The design method consists in carefully selecting a suitable coupler point of a planar four-bar linkage: the coupler curve must fit the characteristics required by the law of motion of the follower. Knowledge of this curve supplies the needed directions to complete the six-bar linkage which is then automatically analysed.

The analysis method and the computer program are fully explained. The program was implemented on a mini-computer: it needs essentially a video-display unit with grafic input-output capabilities.

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Riva, R. Synthesis of Stephenson's six-bar linkages by an interactive technique. Meccanica 16, 157–166 (1981). https://doi.org/10.1007/BF02128444

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