提出了一种欠驱动、冗余自由度为1的混沌振动筛机构设计方案。利用Largrange方法建立了机构的动力学模型,并用MATLAB中的Simulink进行数值仿真。仿真结果表明筛箱的运动是混沌的。 A scheme of underactuated chaotic vibration sieve with redundant degree of freedom of 1 was proposed. The dynamics model of the mechanism was established by Largrange method and simulated by Simulink in MATLAB. The simulation results show that the movement of the screen box is chaotic.