Research On Measurement And Evaluation Technology Of Radiated Sound Field Of Power Ultrasonic System

With the development of ultrasonic machining technology,power ultrasonic machining technology has been widely used in various fields of industrial manufacturing.The core component of this kind of equipment is ultrasonic vibration equipment,and the performance of ultrasonic vibration equipment basically determines the processing technology.Therefore,the research on the distribution of the radiated sound field of ultrasonic vibration equipment and the establishment of the evaluation index which can measure the performance of ultrasonic vibration equipment are of great significance for improving the efficiency of ultrasonic machining,and also for optimizing the design of ultrasonic machining equipment.At present,the research on performance evaluation of ultrasonic vibration equipment is mainly qualitative evaluation or single index quantitative evaluation.There is not a comprehensive index that can evaluate the performance of ultrasonic equipment quantitatively.Therefore,this paper starts from the ultrasonic signal processing,uses the dual hydrophone method to measure the sound intensity points in the sound field,combines the simulation and comparative analysis of the sound field of the ultrasonic vibration equipment,establishes the evaluation index based on the average sound intensity value and the sound field uniformity,and realizes the evaluation technology research of the power ultrasonic vibration equipment.In this paper,ultrasonic sensors are used to collect ultrasonic signals in complex environment.Firstly,threshold gradient detection method is used to eliminate the singular value,then FFT is used to analyze the frequency domain of the signals,the improved wavelet threshold method is used to denoise the ultrasonic signals,and then the denoised signals are smoothed by five points and three times smoothing algorithm The signal after sliding can be calculated by the sound intensity measurement method(P-P technology)selected in this paper.In addition,this paper analyzes the directivity of circular transducer,and studies the influence of transducer size and radiation frequency on the directivity of transducer.The distribution of the radiated sound field of the cylindrical transducer is derived by using the distribution of the radiated sound field of the single piston element,and the simulation experiment is completed by using MATLAB.Based on the above research content,the performance evaluationindex of power ultrasonic vibration equipment is designed,and the transverse and longitudinal sound fields of dumbbell shaped tool head,nine knot whip tool head and diamond tool head are analyzed.In addition,the performance evaluation indexes of the above design are used to calculate the index results of three different tool heads respectively,and the feasibility of the index scheme is verified by combining the calculation results and sound field analysis.Through the feasibility analysis,the ultrasonic performance evaluation index proposed in this paper can meet the requirements of quantitative evaluation of power ultrasonic vibration equipment,which is of great significance for the selection of ultrasonic vibration equipment in industrial processing,and has a certain guiding role in improving and optimizing the design of ultrasonic vibration equipment.