Acoustic Transfer Characteristics of Ship’s Bridge for Whistle Sound

Yim, Jeong-Bin; Kim, Chang-Kyoung

Journal of Navigation and Port Research 2004;28(6):491-496.
Published online August 31, 2004.

기적음에 대한 선박 선교의 음향전달특성

임정빈, 김창경

Acoustic Transfer Characteristics of Ship’s Bridge for Whistle Sound

Jeong-Bin Yim, Chang-Kyoung Kim

Abstract

The paper describes measurement techniques for an acoustic transfer characteristic of ship’s bridge stimulated by a whistle sound. The response sounds. according to the opening-shutting conditions of bridge doors for Training ship ‘SAENURI’, are measured by B&K 2260D equipment, and then the frequency responses are extracted by B&K 7830 software. To evaluate the measured transfer characteristic, the 128th order FIR (Finite Impulse Response)filters, containing the different frequency characteristics, are constructed based on the frequency sampling based design method. Using evaluation indexes with six scales, psychological assessments by five subjects are carried out with test sounds which are obtained from convolving the source signal with FIR filters. Ad results of tests, the test sounds gives AS 3.3~4.7 which means the psychological sense of ‘it is almost similar sound as original ones in a real world’, and thus it is clearly seen that the proposed method can be used for the measurement of an acoustic transfer characteristic of ship’s bridge.

Key Words: whistle sound;acoustic transfer characteristic of bridge;bridge door;Sound Pressure level(SPL);FIR filter