Study On Ultrasonic Phased Array Probe Sound Field Simulation Based On ANSYS

Ultrasonic phased array detection technology controls the excitation relative delay of the probe array elements by electronic technology,so that the sound beam has the ability to deflect,focus and deflect focus.Ultrasonic phased array can effectively improve the detection sensitivity and resolution of the sound field by using its characteristics.However,the different parameters of ultrasonic phased array transducer have a big impact on sound field.As a result,the detection sensitivity and resolution of the sound field will also change.Therefore,ultrasonic phased array probe sound field is worth studying.The finite element model of the sound field in ultrasonic phased array probe of Q235 steel plate ultrasonic phased array detection was established and simulated by ANSYS software.It can not only save the research cost and time but also it easier for the detector to understand the detection sound field intuitively.At the same time,it also provides reference for the prediction of actual detection,selection of transducer and analysis of detection results,and has important application value.In this study,based on fundamentals of ultrasonic phased arrays.Q235 steel plates are used as research objects.The finite element model of ultrasound phased array probe sound field and ultrasound phased array detection sound field with round hole defects were established.Based on this,the distribution characteristics of the ultrasonic phased array probe sound field was analyzed.And the effects of geometric parameters of ultrasound phased array probe and depth of focus on detection sound field were summarized.So selecting rules of probe for testing different depth defect are proposed.The main research contents includes:Firstly,the finite element model of the sound field in ultrasonic phased array probe of Q235 steel plate ultrasonic phased array probe was established and simulated by ANSYS software.And the simulation results were processed to obtain the focused sound field figure of each model by MATLAB software.Based on this,the characteristics of the ultrasonic phased array probe sound field was understood intuitively.Secondly,the ANSYS software was used to simulate the sound in ultrasonic phased array probe of Q235 steel plates with a circular hole defect.And the selection criteria of probe in the near field area from different positions on the detection surface were summarized.Finally,the ANSYS software was used to simulate the sound in ultrasonic phased array probe of Q235 steel plates with a circular hole defect in near field region,near field length and far field region.Combining with the commonly used focusing rules in actual detection and experimental proof.And the selecting rules of focus position were proposed.The results of the study show that,a variety of parameters of the ultrasonic phased array probe have complex effects on the detection index of the sound field.For example,the detection sensitivity and resolution of the sound field were improved with the number increase of array element.But the detection area will be reduced.In order to detect the defects in different positions,the probe with different parameters should be selected.Meanwhile,the choice of the focus position is also an important problem worth considering in the detection.For the defects in the near field area and close to the detection surface,the focus is set in the near field area,and the high-frequency probe with 32 array elements and small array spacing can improve the detection rate and detection efficiency.For the defect located in the near field area and far from the detection surface,the near field focus is still selected,and the intermediate frequency probe with 64 array elements,larger array element spacing and width can meet the requirements of detection sensitivity and resolution.Considering the sensitivity,resolution and quantitative error,it is suggested to set the focus on the actual near-field length of the probe for the defects across the near-field and far-field regions.For defects in the far field area,it is better to set the focus at the target to be tested.