Browsing by Author "Lakshminarayana, K."

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Four different graphical constructions are put forward for the synthesis of the RSSR crank-rocker mechanism for prescribed oscillation angle and quick-return ratio. All these graphical constructions exhibit a series of designs, enabling some amount of direct choice. Checks for crankrocker action and for oscillation between the prescribed positions and in the prescribed direction are included along with a consideration of the transmission angle. These graphical procedures are believed to be useful when critical demands are not being made or while deviating somewhat from a limited set of catalogued designs. © 1984.
(Graphical synthesis of the RSSR crank-rocker mechanism) Lakshminarayana, K.; Balaji Rao, L.V.
1984
Graphical synthesis of the RSSR crank-rocker mechanism
(1984) Lakshminarayana, K.; Balaji, Rao, L.V.
Four different graphical constructions are put forward for the synthesis of the RSSR crank-rocker mechanism for prescribed oscillation angle and quick-return ratio. All these graphical constructions exhibit a series of designs, enabling some amount of direct choice. Checks for crankrocker action and for oscillation between the prescribed positions and in the prescribed direction are included along with a consideration of the transmission angle. These graphical procedures are believed to be useful when critical demands are not being made or while deviating somewhat from a limited set of catalogued designs. 1984.
Isometric designs are those that carry the same linear dimensions. Unique specification of the motion requirements of a mechanism between skew axes, with the help of a suitable set of conventions, removes all alternative designs isometric to the original mechanism, with one exception: an isometric design satisfying exactly the same motion requirements is available but with the algebraic sign of the axis distance changed. The transformation is one of reflection and is called an opposite isometry. Extending the use of unique specification of motion requirements to the special case of two-position design with identical specification of motion derivatives at the two positions (as in the case of a crank-rocker design), one is left with an alternative isometric design, without change of sign of axis distance. The device consists of a change of direction of motion of the mechanism, coupled with an interchange of mechanism positions that correspond to the two distinct positions on the curve of motion relationship. There is, in this case, what is called a direct isometry. The two transformations are shown to be useful: (i) in reducing the extent of design cataloguing, and (ii) in reducing the area of search for suitable mechanism designs. © 1983.
(Isometry in mechanism design) Lakshminarayana, K.; Balaji Rao, L.V.
1983
Isometry in mechanism design
(1983) Lakshminarayana, K.; Balaji, Rao, L.V.
Isometric designs are those that carry the same linear dimensions. Unique specification of the motion requirements of a mechanism between skew axes, with the help of a suitable set of conventions, removes all alternative designs isometric to the original mechanism, with one exception: an isometric design satisfying exactly the same motion requirements is available but with the algebraic sign of the axis distance changed. The transformation is one of reflection and is called an opposite isometry. Extending the use of unique specification of motion requirements to the special case of two-position design with identical specification of motion derivatives at the two positions (as in the case of a crank-rocker design), one is left with an alternative isometric design, without change of sign of axis distance. The device consists of a change of direction of motion of the mechanism, coupled with an interchange of mechanism positions that correspond to the two distinct positions on the curve of motion relationship. There is, in this case, what is called a direct isometry. The two transformations are shown to be useful: (i) in reducing the extent of design cataloguing, and (ii) in reducing the area of search for suitable mechanism designs. 1983.