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 acoustic field characteristics research of ultrasonic transducers, and in particular to a method for sound field simulation of rectangular ultrasonic transducers. Background technique [0002] Ultrasonic transducers are often used in industrial non-destructive testing. The performance of ultrasonic transducers plays a very important role in industrial non-destructive testing. The sound pressure distribution characteristic of the sound field is one of the important performances of ultrasonic transducers. The resolution, positioning and size judgment of defect detection have a great influence. Therefore, in the design and pre-use selection process of the ultrasonic transducer, 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 zone and the sound pressure distribution on the acoustic axis. In the prior art, in or...

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" (The time-dependent force and radiation impedance on a piston in a rigid infinite planar baffle), proposing A simulation model of the spatial impulse response is proposed, but for the rectangular ultrasonic transducer, because the rectangular ultrasonic transducer needs to be described by two parameters of length and width, the simulation is more complicated, and there is no simple simulation of its spatial sound pressure at present. Methods; K.B. Ocheltree and L.A. Frizzel, pp. 242-248 in IEEE Ultrasonics, Ferroelectrics and Frequency Control, No. 36, 1989 Page, published the article "Sound Field Calculation for Rectangular Sources", the rectangular ultrasonic transducer is divided into tiny array elements, each array element satisfies the condition of far-field approximation, and then all the array elements The sum of the spatial impulse responses of the elements is used 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