Abstract: An effective approach of stirring mixing was developed by integrating chaotic mapping and pulse width modulation (PWM) scheme. The chaotic numerical sequence was gained from one-dimensional logistic mapping and then assigned to the PWM duty cycle. The chaotic PWM signal was, by a full bridge converter, transformed into the chaotic voltage which acted on a DC motor driving the agitator. Thus, the rotational speed of agitator was chaotic. Stirring mixing experiments were conducted utilizing the acid-alkali neutralization decolorization method, and glycerin was stirred. Experimental results with the same maximum speed revealed that conventional constant-speed agitation approximately needed 9 min to achieve complete homogeneity, whereas chaotic-speed agitation just needed 20 s to achieve the same homogeneity, 5% of the former.

Key words: chaotic mapping, pulse width modulation, chaotic-speed stirring

摘要： 将混沌映射与脉冲宽度调制(PWM)技术相结合，开发了一种混沌转速搅拌混合技术. 该技术基于一维逻辑斯蒂映射获得混沌数值序列，然后将该数值序列赋予PWM占空比，经全桥驱动电路转变成混沌电压信号，从而使搅拌轴驱动电机转速呈混沌状态. 采用酸碱中和脱色法对甘油溶液进行了搅拌混合实验研究. 结果表明，在最大转速相同的条件下，为使甘油溶液完全混合均匀，常规匀速搅拌需近9 min，而混沌转速搅拌仅需20 s，后者所用时间仅为前者的5%.

关键词: 混沌映射, 脉冲宽度调制, 混沌转速搅拌