Reliability of Kinematic Accuracy and Rate Life for Planar Mechanism
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摘要: 平面机构传递路线较长,对机构运动输出精度产生的影响不能忽视。将影响机构运动精度可靠性因素分为非累积性因素和累积性因素,提出了非累积性因素和累积性因素耦合作用下平面机构的运动精度可靠性分析方法;以Archard磨损模型为理论基础建立了磨损可靠性干涉模型;提出了在额定转速下机构寿命的计算方法。对曲柄滑块机构结果表明:累积性因素是影响机构运动精度的主要原因,当累积性因素累积到一定程度时,机械可靠度急剧下降,并计算了机构在额定转速下机构的额定寿命。Abstract: Planar mechanisms are widely applied to many machines, but the impact of their long transmission distance on the kinematic accuracy can not be ignored. The influence factors of reliability in precision of mechanism kinematic were divided into non-cumulative factors and cumulative factors. The analysis methods of reliability in precision of planar mechanism motion were given under the conditions of coupling effects by cumulative factors and non-cumulative factors. The model of wear reliability interference was established based on the Archard wear model. The calculating method for rated life was proposed under the condition of rotational speeds. The crank slider mechanism was analyzed as an example, which is widely used in engineering. The results showed that the cumulative factors is the main factor which affects the kinematic accuracy of mechanisms, the mechanical reliability falls sharply when cumulative factors accumulate to a certain extent and the rated life of various institutions is calculated under the rated speed.
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Key words:
- kinematic accuracy /
- coupling /
- wear,reliability /
- life /
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