CAJ | 학술논문

解决了舰船辐射噪声测量过程中采用大孔径基阵易受到水声信道影响及布放实施困难的问题。在该方法的研究过程中，提出了一种利用超指向性小孔径圆柱阵对舰船辐射噪声源进行分辨与噪声级测量的方法。该方法利用超指向性小孔径圆柱阵主瓣宽度较窄、增益较高的特点，可同时实现对舰船多个辐射噪声源的分辨与噪声级测量。首先建立了具有超指向性的圆柱阵波束形成理论模型；其次，推导了基于超指向性小孔径圆柱阵舰船辐射噪声测量的理论公式；最后，通过计算机仿真实验分析了超指向性小孔径圆柱阵舰船辐射噪声源分辨能力及噪声级测量性能。仿真结果表明：当阵元间距与波长之比小于0?5时，超指向性波束形成的指向性指数远大于常规波束形成，能有效分辨舰船低频辐射噪声源；该方法能有效地测量舰船低频辐射噪声级，并且测量误差较小。
해결료함선복사조성측량과정중채용대공경기진역수도수성신도영향급포방실시곤난적문제。재해방법적연구과정중，제출료일충이용초지향성소공경원주진대함선복사조성원진행분변여조성급측량적방법。해방법이용초지향성소공경원주진주판관도교착、증익교고적특점，가동시실현대함선다개복사조성원적분변여조성급측량。수선건립료구유초지향성적원주진파속형성이론모형；기차，추도료기우초지향성소공경원주진함선복사조성측량적이론공식；최후，통과계산궤방진실험분석료초지향성소공경원주진함선복사조성원분변능력급조성급측량성능。방진결과표명：당진원간거여파장지비소우0?5시，초지향성파속형성적지향성지수원대우상규파속형성，능유효분변함선저빈복사조성원；해방법능유효지측량함선저빈복사조성급，병차측량오차교소。
A novel method of discriminating among the noise sources and measuring the ship-radiated noise levels via a super-directivity small aperture cylinder array is proposed;this is used to eliminate the effect caused by the a-coustic channel and to solve the problem that it is difficult to place the measurement array. The narrow beamwidth and high gain can be obtained with optimal weighting technology to distinguish among the sources and to estimate the source levels. In this method, firstly, the beamforming theoretical model of the super-directivity cylinder array is established. Then, the calculation formula for measuring the ship-radiated noise based on the super-directivity small aperture cylinder array is derived. Finally, the resolution of the ship-radiated noise sources and measurement per-formance are, respectively, analyzed in the simulation and the results and their analysis demonstrate preliminarily that, when the ratio of the inter-element spacing to the wavelength is less than 0?5: (1) the directivity index ob-tained with the proposed method is greater than that obtained with conventional beamforming, and it is effective to use the proposed method to discriminate among the sources; ( 2 ) in the low frequency band of the ship-radiated noise, the effectiveness of the proposed method is verified, and the measurement error can be significantly reduced.