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Abstract: Study
of self-adjustable mechanisms without overconstraint, which are high
efficiency and stability and low cost, is the most important aspect of
robust design based on the uncertainty of planar constraints. Mechanism
of self-adjustment is analyzed for planar crank-rocker mechanism without
overconstraint, and self-adjustment conditions of the crank-rocker
mechanism are derived from the condition of self-locking in prismatic
pair. With this understanding, a method, which can be used to analyze
performance of self-adjustment for the crank-rocker mechanism, is
proposed and allowable error angles that the mechanism can self-adjust
are found. Some conclusions and rules, which can be applied to
synthesizing for the self-adjustable mechanisms and determining for
shape-position tolerances of kinematic-pair elements and axes, are
obtained. Thereby, the theoretic foundation is provided for designing
self-adjustable machines scientifically, and not experientially.
Key words: Overconstraint
Crank-rocker mechanism Self-adjustment Self-adjustable
structures Allowable errors
CLC No: TH112
国家自然科学基金资助项目(50075087).
Received 20030625, received in revised form 20040102
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