Research On Theoretical Model Of Ultrasonic Power Energy Transfer

Ultrasound-assisted cutting is applied to the processing of honeycomb composite structural parts due to its small cutting force and high processing precision.However,the domestic exploration of theoretical research and application of ultrasonic processing technology is not comprehensive.As an energy source for processing systems,ultrasonic power supplies are critical to process stability and cutting efficiency.This paper mainly studies the theoretical model of energy transfer.By analyzing the relationship between the ultrasonic vibration system and the ultrasonic power supply and the external load,regarding the acoustic parameters such as static capacitance,dynamic resistance and resonance frequency,the electro-acoustic adjustment model and the force-acoustic influence model are respectively established and verified,and the two models are integrated and generated.The energy transfer model guides the ultrasonic power supply to adjust the acoustic parameters to improve the stability and efficiency of the ultrasonic machining.The main research work and achievements are as follows:1.The ultrasonic processing energy transmission system is divided into two parts:ultrasonic power supply and ultrasonic vibration system.The structure and important features of the two parts are introduced.The characterization of ultrasonic processing energy transmission system is proposed.The ultrasonic vibration system is partly reflected in the amplitude of the tool and the temperature rise of the key parts.The ultrasonic power supply is reflected in the changes of parameters such as phase difference,frequency and impedance.The concept of "standing wave" in the field of radio frequency is introduced.The ratio of forward power to reflected power is used to reflect the efficiency of energy transmission.2.The ultrasonic vibration system is used as a whole to establish an equivalent circuit diagram and analyze its impedance characteristics and resonance characteristics.The admittance circle diagram is established by the relationship between the acoustic parameters,and the acoustic parameters associated with ultrasonic power conditioning and external force loads are determined as resonant frequency,electrostatic capacitance,and dynamic resistance.The influence of the matching components in the ultrasonic power supply on the acoustic parameters of the ultrasonic vibration system is studied experimentally,and the matching method is determined.According to the principle of power distribution and minimum value,a calculation model of the matching component is obtained.Finally,an electro-acoustic adjustment model between the ultrasonic power supply and the acoustic parameters of the ultrasonic vibration system is established,and its correctness and applicability are verified.3.Establish the ultrasonic machining cutting force model and compare it to the three-way component force for research.The thrust force load is simulated by a push-pull force meter,and the ultrasonic vibration system is subjected to impedance analysis under different force loads.The impedance data was processed by the spss mathematical statistics software and the fitting curve was obtained.The force-acoustic influence model between the force load and the resonant frequency,dynamic resistance and static capacitance was obtained.The correctness and applicability were verified by experiments.4.Integrate the electro-acoustic adjustment model and the force-acoustic impact model to establish a complete energy transmission model,guide the ultrasonic power supply to adjust according to different processing conditions,and obtain high processing quality and energy utilization efficiency quickly and effectively.With the standing wave ratio as the index,the validity of the theoretical model of energy transfer is tested.The results show that the energy transfer model is correct and feasible.