In this study, with the finite element analysis(FEA), the variation of the performances of underwater acoustic transducer in relation to its structural variables were analyzed. In addition, the new optimal design scheme of acoustic transducer that could reflect not only individual but also all the c...
In this study, with the finite element analysis(FEA), the variation of the performances of underwater acoustic transducer in relation to its structural variables were analyzed. In addition, the new optimal design scheme of acoustic transducer that could reflect not only individual but also all the cross-coupled effects of multiple structural variables, and could determine the detailed geometry of the transducer with great efficiency and rapidity was developed. The validation of the new optimal design scheme was verified by applying the optimal structure design of a flextensional and a Tonpilz transducer which are the most common use for high power underwater acoustic transducer. The finite element model of the flextensional transducer was constructed, and the validity of the model was verified through comparison with previously reported results. The following results of the preliminary calculations on the performance of the transducer in relation to its structural and material parameters, the most influential structural variables were established. Through statistical multiple regression analysis of the finite element analysis results, the functional forms of the performances in terms of the structural variables were derived. By applying the constrained optimization technique, Sequential Quadratic Programming Method ofPhenichny and Danilin(SQP-PD), to the derived function, the optimal structure of the transducer that could provide the highest sound pressurelevel and the highest working depth at the resonance frequency of 1 kHz was determined. Furthermore, the validity of the optimized result was confirmed through comparison of the optimal performance with that of trial transducers of different geometries. The optimal structure of the Tonpilz transducer was designed. First, the FE model of the transducer was constructed, that included all the details of the transducer which used practical environment. The validity of the FE model was verified through the impedance analysis of the transducer. Second, the resonance frequency, the sound pressure, and the bandwidth of the transducer in relation to its structural variables were analyzed. Third, the design method of 2n experiments was employed to reduce the number of analysis cases, and through statistical multiple regression analysis of the results, the functional forms of the transducer performances that could consider the cross-coupled effects of the structural variables were derived. Fourth, the optimal geometry of the Tonpilz transducer that had the highest sound pressure level at the resonance frequency of 30 kHz and satisfied the -3dB fractional bandwidth more than 10 % was determined through the optimization with the SQP-PD method of a target function composed of the transducer performance. The validity of the optimized structure was checked through comparison with trial geometries of the transducer with other arbitrary dimensions. In addition, with the FEA, the impulsive shock pressure of the transducer in relation to its structural variables were analyzed. Based on the all results, the optimal structure of the Tonpilz transducer that could provide the highest sound pressure at the desired working environment were designed and verified. The validation of the new optimal design scheme was verified by applying the optimal structure design of the flextensional and the Tonpilz transducer that could provide the highest performance at the desired working environment. Furthermore, for the convenience of a user, the automatic process program making the optimal structure of the acoustic transducer automatically at a given target and a desired working environment was made. In near future, it is required to carry out more research concerning a manufacturing and an experimental study of the designed optimal structure of the Tonpilz and the flextensional transducer. The optimal design method developed could reflect all the cross-coupled effects of multiple structural variables, and could determine the detailed geometry of the transducer with great efficiency and rapidity. However, when the nonlinear interactions of the variables have strong effects on the transducer performance, it is desirable to carry out more rigorous validation of the regression equation before real application of the design method. The developed technique is so general that it can also be applied to any other type of acoustic transducers as well.
In this study, with the finite element analysis(FEA), the variation of the performances of underwater acoustic transducer in relation to its structural variables were analyzed. In addition, the new optimal design scheme of acoustic transducer that could reflect not only individual but also all the cross-coupled effects of multiple structural variables, and could determine the detailed geometry of the transducer with great efficiency and rapidity was developed. The validation of the new optimal design scheme was verified by applying the optimal structure design of a flextensional and a Tonpilz transducer which are the most common use for high power underwater acoustic transducer. The finite element model of the flextensional transducer was constructed, and the validity of the model was verified through comparison with previously reported results. The following results of the preliminary calculations on the performance of the transducer in relation to its structural and material parameters, the most influential structural variables were established. Through statistical multiple regression analysis of the finite element analysis results, the functional forms of the performances in terms of the structural variables were derived. By applying the constrained optimization technique, Sequential Quadratic Programming Method ofPhenichny and Danilin(SQP-PD), to the derived function, the optimal structure of the transducer that could provide the highest sound pressurelevel and the highest working depth at the resonance frequency of 1 kHz was determined. Furthermore, the validity of the optimized result was confirmed through comparison of the optimal performance with that of trial transducers of different geometries. The optimal structure of the Tonpilz transducer was designed. First, the FE model of the transducer was constructed, that included all the details of the transducer which used practical environment. The validity of the FE model was verified through the impedance analysis of the transducer. Second, the resonance frequency, the sound pressure, and the bandwidth of the transducer in relation to its structural variables were analyzed. Third, the design method of 2n experiments was employed to reduce the number of analysis cases, and through statistical multiple regression analysis of the results, the functional forms of the transducer performances that could consider the cross-coupled effects of the structural variables were derived. Fourth, the optimal geometry of the Tonpilz transducer that had the highest sound pressure level at the resonance frequency of 30 kHz and satisfied the -3dB fractional bandwidth more than 10 % was determined through the optimization with the SQP-PD method of a target function composed of the transducer performance. The validity of the optimized structure was checked through comparison with trial geometries of the transducer with other arbitrary dimensions. In addition, with the FEA, the impulsive shock pressure of the transducer in relation to its structural variables were analyzed. Based on the all results, the optimal structure of the Tonpilz transducer that could provide the highest sound pressure at the desired working environment were designed and verified. The validation of the new optimal design scheme was verified by applying the optimal structure design of the flextensional and the Tonpilz transducer that could provide the highest performance at the desired working environment. Furthermore, for the convenience of a user, the automatic process program making the optimal structure of the acoustic transducer automatically at a given target and a desired working environment was made. In near future, it is required to carry out more research concerning a manufacturing and an experimental study of the designed optimal structure of the Tonpilz and the flextensional transducer. The optimal design method developed could reflect all the cross-coupled effects of multiple structural variables, and could determine the detailed geometry of the transducer with great efficiency and rapidity. However, when the nonlinear interactions of the variables have strong effects on the transducer performance, it is desirable to carry out more rigorous validation of the regression equation before real application of the design method. The developed technique is so general that it can also be applied to any other type of acoustic transducers as well.
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