变参数四连杆机构运动及动力性能研究

Study on the Kinematic and Dynamic Performance of Variable Parameter Four-Bar Linkage Mechanism

基于圆弧组合的变参数四杆机构是采油工程领域抽油机的主要传动机构。首次建立了基于单圆弧、双圆弧组合和双圆弧组合变参数四杆机构运动规律的精确数学模型,研究和分析了单圆弧、双圆弧组合和三圆弧组合情况下变参数四杆机构的运动和动力性能。研究结果显示,虽然三圆弧组合的动力性能最优,其次是双圆弧组合、单圆弧,但三者的动力性能差别很小。首次将变参数四杆机构和四杆机构运动和动力性能进行了详细对比分析,论证了变参数四杆机构动力性能优于四杆机构的主要原因是摇杆角速度运动规律更接近于正弦运动规律。

The variable parameter four-bar linkage based on arcs combination is the main transmission mechanism of pumping unit in oil production engineering field.The motion law mathematical models of variable parameter four-bar linkage based on single arc,double and three arcs combination are developed,and its kinematic and dynamic performance are analyzed.The results suggest that the dynamic performance of three arcs combination is the best,followed by double arcs combination and single.However,the dynamic performance differences between the three models are not distinguishable.The kinematic and dynamic performances of variable parameter four-bar and four-bar linkage are analyzed and compared.The main reason for the dynamic performance of variable parameter four-bar linkage being better than four-bar linkage is rocker angular velocity motion law closer to sine motion law.