由船舶所引起的輻射噪音，主要是來自主機引擎、推進器(螺槳) 以及流體擾動等，尤其以前兩者最為顯著。一般量測在水中轉動的螺槳葉片噪音主要在空蝕水槽進行，但在量測裝備及分析方法上，無國家標準，國內不論在空蝕水槽或是在拖航水槽中都尚未有關於螺槳噪聲標準量測的研究。
本研究主要是利用水下聽音器陣列在成大拖航水槽量測水中螺槳噪聲與分析螺槳噪聲，藉由結果分析逐步的修正實驗步驟與實驗架設得以建立標準水中螺槳噪聲量測與分析流程，建立起一套完整的在水槽量測水中螺槳噪聲的標準流程與系統，並利用時間反轉法與陣列效應呈現出螺槳的噪聲頻譜圖來觀察螺槳的聲音特性。
本研究經過多次螺槳噪聲量測後，得出在成大拖航水槽進行螺槳噪聲量測的水聽器架設位置應當在螺槳側邊與後方較佳，在螺槳前方易造成收不到聲源訊號，且適當量測螺槳轉速為7 rps至9 rps。並將接收訊號透過時間反轉法還原與陣列效應可獲得水下螺槳非空蝕噪聲的聲紋。

The radiated noise caused by ships mainly comes from main engine, propeller and fluid disturbance, etc. Especially the former two are the most significant. Generally, the measurement of propeller blades rotating in the water is mainly cavitation noise. There are no good results in the measurement of propeller noise in the cavitation tank, neither are on the measurement of propeller noise in the towing tank in ROC.
This research mainly uses hydrophone array to measure the propeller noise in the water and analyze the propeller noise in the towing tank of National Cheng Kung University. Through the analysis of the results, the step-by-step correction experiment procedure and experimental setup are used to establish a standard underwater propeller noise measurement. In this study, a complete set of standard process and system for measuring the propeller noise in the towing tank is established. Also use time reversal method and the array gain effect are used to observe the propeller noise spectrogram .
After many times of propeller noise measurement in this research, it is concluded that the hydrophones for propeller noise measurement in the towing tank of National Cheng Kung University gives better results on the sides and rear of the propeller than those in front of the propeller. The appropriate measurement propeller rotational speed is 7 rps to 9 rps. The received signal is restored through the time reversal method and array effect to obtain the sound print of the underwater propeller non-cavitation noise.

[1] D. Ross and W. Kuperman, "Mechanics of underwater noise," ed: Acoustical Society of America, 1989.
[2] J. Bosschers, F. Lafeber, J. de Boer, R. Bosman, and A. Bouvy, "Underwater radiated noise measurements with a silent towing carriage in the Depressurized Wave Basin," in AMT Conference, Gdansk, 2013.
[3] ITTC, "Underwater from ships, full scale measurement " ITTC - Recommwnded Procedures and Guideline, 2017.
[4] ITTC, "Model-Scale Propeller Cavitation Noise Measurements," ITTC - Recommwnded Procedures and Guideline, 2017.
[5] H. Seol, B. Jung, J.-C. Suh, and S. Lee, "Prediction of non-cavitating underwater propeller noise," Journal of Sound and Vibration, vol. 257, no. 1, pp. 131-156, 2002.
[6] H. Haimov, V. Gallego, E. Molinelli, and B. Trujillo, "Propeller acoustic measurements in atmospheric towing tank," Ocean Engineering, vol. 120, pp. 190-201, 2016.
[7] D. R. Jackson and D. R. Dowling, "Phase conjugation in underwater acoustics," The Journal of the Acoustical Society of America, vol. 89, no. 1, pp. 171-181, 1991.
[8] W. Kuperman, W. S. Hodgkiss, H. C. Song, T. Akal, C. Ferla, and D. R. Jackson, "Phase conjugation in the ocean: Experimental demonstration of an acoustic time-reversal mirror," The journal of the Acoustical Society of America, vol. 103, no. 1, pp. 25-40, 1998.
[9] S. Yon, M. Tanter, and M. Fink, "Sound focusing in rooms: The time-reversal approach," The Journal of the Acoustical Society of America, vol. 113, no. 3, pp. 1533-1543, 2003.
[10] 吳柏賢, "聲音全像法於傳動系統噪音之分析," 2006.
[11] 廖科涵, 數位麥克風陣列系統應用於即時聲源定位及聲音全像之開發研究. 2017.
[12] D. Cassereau and M. Fink, "Time-reversal of ultrasonic fields. III. Theory of the closed time-reversal cavity," IEEE transactions on ultrasonics, ferroelectrics, and frequency control, vol. 39, no. 5, pp. 579-592, 1992.
[13] D. Cassereau and M. Fink, "Focusing with plane time‐reversal mirrors: An efficient alternative to closed cavities," The Journal of the Acoustical Society of America, vol. 94, no. 4, pp. 2373-2386, 1993.
[14] G. Grelowska, E. Kozaczka, S. Kozaczka, and W. Szymczak, "Underwater noise generated by a small ship in the shallow sea," Archives of Acoustics, vol. 38, no. 3, pp. 351–356, 2013.
[15] 胡天群, 沈浩, and 刘宽诚, "螺旋桨噪声的 Wigner 谱研究," 交通部上海船舶运输科学研究所学报, vol. 1, 1998.
[16] M. D. Turbo, 船舶推进基本原理. 2012.
[17] R. Urick and W. Kuperman, "Ambient noise in the sea," ed: Acoustical Society of America, 1989.