Design of Statically Balanced Planar General Four-bar Linkage with Base-attached Springs
Date Issued
2007
Date
2007
Author(s)
Lin, Po-Yang
DOI
en-US
Abstract
Design of statically balanced, planar four-bar linkages with base-attached springs is presented. This design is based on the methodology of conservation of potential energy, formulated by the use of complex number notations for vectors. Minimal numbers of springs required for the two- and four-bar linkages are first identified by the number of independent variable vectors existed in the formulation of the gravitational potential energy. Spring constants and installed angles of springs are then determined by setting the variation of the total gravitational and elastic potential energy to be zero. Derived from the design conditions of general four-bar linkages, designs of statically balanced parallelograms are also accomplished. A transportation device of a general four-bar is given as an example to illustrate the achievement of a spring balancing mechanism. And an eight-bar Peaucellier straight line linkage is demonstrated as an example of a multi-loop linkage system to be applied with the proposed design methodology.
Subjects
靜平衡機構
拉伸彈簧
平行機構
四連桿機構
static balance
spring
planar parallel linkages
Type
thesis
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