To address the issue of resonance frequency shifts, output amplitude reduction, and vibration instability in piezoelectric transducers (PT) during the cutting process of ultrasonic surgical instruments due to temperat...
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To address the issue of resonance frequency shifts, output amplitude reduction, and vibration instability in piezoelectric transducers (PT) during the cutting process of ultrasonic surgical instruments due to temperature changes and load fluctuations, resulting in decreased cutting quality and efficiency, severely impacting surgical outcomes, this paper proposes an amplitude-phase control algorithm based on fuzzy PI against vibration fluctuations of ultrasonic surgical instruments. This algorithm adopts a dual-loop control design: the frequency control loop locks the impedance phase of the transducer to zero through the phasecontrol method, achieving rapid resonance frequency tracking;the amplitudecontrol loop maintains a constant input current through the amplitudecontrol method, ensuring stable amplitude output. In complex surgical environments, this dual-loop control design is more reliable and practical compared to a single control method. To enhance the controlalgorithm's adaptability and robustness to load and temperature changes, a fuzzy PI controller is used instead of a traditional PI controller. Simulation results show that when the load is large, merely using a resonance frequency tracking algorithm cannot ensure stable vibration amplitude of the piezoelectric transducer. Compared with the classic PI control, the algorithm based on fuzzy PI control can quickly and stably track the resonance frequency and maintain constant amplitude under different loads, exhibiting stronger robustness and adaptability. Experiments validate the effectiveness of this algorithm in practical applications, demonstrating that within a reasonable working pressure range (not exceeding 5 N), the controlalgorithm is robust, maintaining good cutting ability and vibration stability of the ultrasonic surgical instrument. The method proposed in this paper is of significant importance for ensuring the vibration stability of ultrasonic surgical instruments, improving surgical outcom
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