关键词: 轨迹综合, 平面连杆机构, 数学形态学, 特征参数

Abstract: The problems existing in present methods for describing the coupler curve of linkage mechanism are analyzed. A new analyzing method based on mathematical morphology is proposed. It is shown that the characteristic parameters obtained by the new method are independent of the scale，direction and position of the coupler curve. A database for the coupler curves of linkage mechanisms，which is of small redundancy and quick to be retrieved，is built by using these characteristic parameters.

Key words: Mathematical morphology, Characteristic parameter, Mechanism synthesis Planar linkage mechanism