基于模糊自寻优控制方法的自动频率跟踪

本文研究了功率超声外科手术设备的自动频率跟踪技术。首先,分析了功率超声振动系统中振速与频率之间关系,把频率跟踪过程表述为一维变极值点的寻优问题。然后,结合自寻最优自适应控制方法和模糊控制方法.提出了一种模糊自寻优控制方法来实现自动频率跟踪。通过对梯度自寻优控制方法和模糊自寻优控制方法进行实验比较,得出模糊自寻优控制方法能够解决频率瞬变漂移的跟踪问题。

Automatic Frequency Tracking Based on Fuzzy Self-Optimizing Control Approach

The problem of automatic frequency tracking for the power ultrasonic vibration system is studied. First, the relationship between the vibration velocity and frequency are analyzed. The process of frequency tracking is described as the problem of searching for one dimension fluctuant extremum. And then, a fuzzy self-optimizing control approach is presented to implement the frequency tracking through the analysis of the self-optimizing adaptive control approach together with the fuzzy control method. Experiments show that fuzzy self-optimizing control approach can solve the problem of frequency tracking for the transient large frequency drift, as compared with the self-optimizing adaptive control approach. This approach can be applied to the vibration velocity feedback frequency tracking system.