从动件在极限位置作直到3阶停歇的平面六杆机构设计与虚拟实验

Design and Virtual Experiment on Driven Member Doing unto Three-ordered Intermission of Planar Six-bar Mechanism at Limit Position

从动件在极限位置作直到3阶的停歇，表明停歇时间相对较长，可以很好地满足物料传送与纺织机械的工作要求。研究发现，复合函数中2个基本函数在同一时刻的l阶导数同时为零，导致复合函数的1～3阶导数在对应时刻为零，若令1个组合机构的位移函数是该复合函数，2个基本机构的位移函数对应2个基本函数，则输出构件在对应位置作直到3阶的停歇．．通过虚拟实验展示该类机构的尺寸设计与传动特征，实现了机构设计理论与实验教学的有机结合。，

The driven member doing unto three-ordered intermission at limit positions demonstrates that intermission time is relatively longer. It ean meet the work＇ s demands of material transmission and spinning and weaving machinery very well. Research has founded that one to three order differentials of a compound function are zero if one order differentials of two basic functions are zero at the same moment. Let displacement fum＇tion of the combined mechanism is equal to the compound function, and displacement functions of two basic mechanisms uorrespond respectively to two basic functions, then output member does unto three ordered intermission at corresponding position（s）. It realizes an organic integration of theory on mechanism designed with experimental teaching, and slimulates positive factors of the students doing experiments by virtual experiment showing dimension design and transmission characteristic of the mechanisms. This mathematical principle not only sets up a kind of geometric construction design method about driven member doing unto three ordered intermission at one or two limit position （s） but also does not need iterative ealculation and without theoretical error.