哈尔滨工程大学学报
哈爾濱工程大學學報
합이빈공정대학학보
Journal of Harbin Engineering University
2015年
10期
1397-1403
,共7页
反射系数%水声材料%表面阻抗法%矢量传感器%边缘衍射效应%误差分析
反射繫數%水聲材料%錶麵阻抗法%矢量傳感器%邊緣衍射效應%誤差分析
반사계수%수성재료%표면조항법%시량전감기%변연연사효응%오차분석
reflection coefficient%underwater acoustic materials%surface impedance%vector hydrophone%diffraction effect%error analysis
针对采用单矢量传感器表面阻抗法对水声材料进行反射系数测量时产生的测量误差问题,从理论上系统地分析了表面阻抗法的误差来源、影响大小和测量不确定度. 通过数值计算,重点分析了矢量传感器对材料边缘衍射效应的抑制作用,提出了规避其影响的方法,并讨论了发射声源和测量系统等参数对测量结果的影响. 数值计算结果表明:基于矢量传感器的表面阻抗法对材料边缘衍射效应起到了一定抑制作用,测量结果优于双声压水听器法;表面阻抗法对矢量传感器各通道声压灵敏度误差和相位不一致性较敏感;在低频、大角度入射情况下表面阻抗法对测量系统参数误差较敏感.
針對採用單矢量傳感器錶麵阻抗法對水聲材料進行反射繫數測量時產生的測量誤差問題,從理論上繫統地分析瞭錶麵阻抗法的誤差來源、影響大小和測量不確定度. 通過數值計算,重點分析瞭矢量傳感器對材料邊緣衍射效應的抑製作用,提齣瞭規避其影響的方法,併討論瞭髮射聲源和測量繫統等參數對測量結果的影響. 數值計算結果錶明:基于矢量傳感器的錶麵阻抗法對材料邊緣衍射效應起到瞭一定抑製作用,測量結果優于雙聲壓水聽器法;錶麵阻抗法對矢量傳感器各通道聲壓靈敏度誤差和相位不一緻性較敏感;在低頻、大角度入射情況下錶麵阻抗法對測量繫統參數誤差較敏感.
침대채용단시량전감기표면조항법대수성재료진행반사계수측량시산생적측량오차문제,종이론상계통지분석료표면조항법적오차래원、영향대소화측량불학정도. 통과수치계산,중점분석료시량전감기대재료변연연사효응적억제작용,제출료규피기영향적방법,병토론료발사성원화측량계통등삼수대측량결과적영향. 수치계산결과표명:기우시량전감기적표면조항법대재료변연연사효응기도료일정억제작용,측량결과우우쌍성압수은기법;표면조항법대시량전감기각통도성압령민도오차화상위불일치성교민감;재저빈、대각도입사정황하표면조항법대측량계통삼수오차교민감.
In order to handle measurement errors when the acoustic reflection coefficients of underwater acoustic ma-terials are measured by a single vector hydrophone based on surface impedance method, the source of error, the dif-fraction effect and the measurement uncertainty of surface impedance method were theoretically investigated. Numer-ical calculations were focused on analysis of the vector sensor′s restraint on the material edge′s diffraction effect, a method for avoiding the diffraction effect was established. And the parameters′ effects on the measurement result, such as the transmitting sound source and measurement system, were discussed. Numerical results show that the surface impedance method based on vector hydrophone can restrain the diffraction on the material′s edges to a cer-tain degree, which is better than the double pressure hydrophone method. The surface impedance method is sensi-tive to the phase and sensitivity mismatch between pressure and particle velocity channels of the vector hydrophone. It is also sensitive to the system error at large incidence angle and low frequencies.