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论文类型：期刊论文

发表时间：2018-12-02

发表刊物：JOURNAL OF THERMAL STRESSES

收录刊物：SCIE

卷号：41

期号：10-12,SI

页面范围：1525-1537

ISSN号：0149-5739

关键字：Acoustic transducer array; analytical solution; carbon nanotube thin film; high directivity; thermoacoustic

摘要：A new model for a thermoacoustic transducer array with high acoustic beam directivity applying devised carbon nanotube (CNT) thin films is developed. Analytical exact solutions of acoustic pressure field for linear and planar arrays are derived by constructing a new spherical thermoacoustic model. The beamwidth and side-to-main lobe ratios are defined and used as the criteria for determining the optimal array design parameters. The key influencing factors including input frequency, element number, element length and inter-element spacing on the acoustic performance and characteristics are extensively investigated. A comparison between theoretical prediction and experiment is presented to verify the analytical model and very good agreement is reported. The numerical result indicates that increasing the input frequency, element length and inter-element spacing improves the main lobe sharpness while at the same time it lowers the energy efficiency for a fixed element number. It is recommended the largest possible element length, inter-element spacing and element number should be adopted to produce a higher acoustic pressure and better acoustic directivity while meeting the energy efficiency requirement.