With various relative lengths of the links, this four-bar linkage becomes a useful mechanism for converting uniform rotary to non-uniform rotary motion or continuous rotary to oscillatory motion.

改变这些杆的相对长度，这种四杆连杆机构就成为一种实用的机械装置，可以把等速转动转变为非等速转动，或者把连续转动转变成振荡运动。

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DDM motion emulation analysis processes are demonstrated by four-bar mechanism. The emulation result shows the convenience and practicability of DDM in mechanism motion emulation and analysis.

通过四杆机构演示了DDM运动仿真分析白勺过程，得到了仿真结论，说明了DDM在机构运动仿真和分析中白勺简便性和实用性。

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Hence, this paper mainly focuses on the dynamic analysis of the two-side four-bar beating-up motion of an air-je.

介绍平移式后发动机舱门的结构及工作原理，四连杆机构尺寸的确定及动力学校核，以及空气弹簧、门锁的选用等。

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