Simulation method for rectangular ultrasonic transducer sound field

Abstract

The invention discloses a simulation method for a rectangular ultrasonic transducer sound field. The simulation method includes the following steps of 1, establishing a space rectangular coordinate system; 2, regionalizing a fourth quadrant; and 3, simulating a sound field of a rectangular ultrasonic transducer under a simulation software environment by a computer. Specifically, 301, setting and storing initial parameters; 302, setting a coordinate of an arbitrary point P (x,y,z) in sound field radiation space, 303, judging and mapping the position of the point P (x,y,z), 304, determining function relationship h (x,y,z,t)=rec_response (x,y,z,a,b), 305, determining space pulse response h (x,y,z,t) of the transducer by the space point P (x,y,z), 306, determining transient sound pressure p (x,y,z,t) of the transducer by the space point P (x,y,z), 307, determining sound pressure maximum pmax (x,y,z) of the transducer by the space point P (x,y,z), and 308, determining sound pressure distribution rule of the rectangular ultrasonic transducer. The simulation method for the rectangular ultrasonic transducer sound field is novel and reasonable in design, convenient to be realized, low in cost, high in simulation efficiency and high in accuracy, provides theoretical basis for optimizing the design of the rectangular transducer and making nondestructive testing process, and is high in practicability.

Description

technical field [0001] The invention relates to the technical field of sound field characteristics research of ultrasonic transducers, in particular to a sound field simulation method of a rectangular ultrasonic transducer. Background technique [0002] Ultrasonic transducers are often used in industrial nondestructive testing. The performance of ultrasonic transducers plays a very important role in industrial nondestructive testing. The sound pressure distribution characteristics of the sound field are one of the important performances of ultrasonic transducers. The resolution, positioning and size judgment of defect detection have a great influence. Therefore, in the process of designing and selecting ultrasonic transducers before use, it is necessary to know in advance the spatial distribution of the ultrasonic transducer's radiated sound field, including the length of the near-field region and the sound pressure distribution on the sound axis. In the prior art, in order...

AI Technical Summary

Problems solved by technology

In the prior art, in order to obtain the sound pressure distribution of the ultrasonic transducer, measurement methods are mainly used, such as radiation force method, hydrophone method, optical fiber detection method and ball reflection method, etc. These measurement methods need to be designed and After the sample is processed and manufactured, the actual object can be used for measurement, and no matter which measurement method requires professional instruments and equipment, it consumes a lot of manpower and material resources

In order to solve these problems, some researchers began to study the sound field simulation method of ultrasonic transducers. For circular ultrasonic transducers, P.R.Stepanishen (Journal of the Acoustical Society) published in the 49th issue of the American Acoustic Society in 1971 of America), published the article "The time-dependent force and radiation impedance on a piston in a rigid infinite planar baffle" , a simulation model of spatial impulse response is proposed, but for rectangular ultrasonic transducers, because rectangular ultrasonic transducers need to be described by two parameters of length and width, the simulation is more complicated, and there is no spatial sound pressure simulation model at present. Simple Simulation Methods; K.B. Ocheltree and L.A. Frizzel, IEEE Ultrasonics, Ferroelectrics and Frequency Control, Issue 36, 1989, No. On pages 242-248, the article "Sound Field Calculation for Rectangular Sources" (Sound Field Calculation for Rectangular Sources) was published, which divided the rectangular ultrasonic transducer into tiny array elements, each array element satisfies the condition of far-field approximation, and then The spatial impulse response of all array elements is summed to obtain the impulse response of the rectangular transducer. The sound pressure obtained in this way is approximate, which will affect the accuracy of the sound field calculation, and the simulation process is complicated and the simulation efficiency is low.

Images