Automatic testing device for sound characteristics of sea-going ship's whistle

Abstract

The invention discloses an automatic test device for the sound characteristics of a sea-going ship's whistle, which includes: a frame, a mounting platform, a horizontal rotation mechanism, an azimuth adjustment mechanism, a sea-going ship's whistle to be tested, a sound pressure sensor, a measurement and control communication unit and an upper control unit. The upper computer rotates the horizontal rotation mechanism for one revolution through the measurement and control communication unit at a preset step angle, wherein, each time the position of a step angle is rotated, the upper computer controls the whistle of the ship to be tested to sound 4 ~5s, during the sounding of the whistle, the host computer also controls the sound pressure sensor to collect the audio signal from the whistle of the ship to be tested and transmits the audio signal to the host computer, and the host computer processes the audio signal and obtains 1 / 3 octave band sound pressure level distribution map, from which the basic frequency range of the sound and the weighted sound pressure level within the basic range can be obtained. The invention is simple in structure, foldable and easy to carry, improves the efficiency of the sound pressure performance test of the whistle, and makes the measurement result more accurate.

Description

technical field [0001] The invention relates to the testing field of audio sound characteristics, and more specifically relates to an automatic test device for the sound characteristics of sea-going ship whistles. Background technique [0002] Sea-going whistles are extremely critical sound safety equipment in ship navigation operations. Their sound characteristics (basic frequency range, sound pressure level, and sound radiation directivity) are directly related to the ship's ability to avoid collisions and call for help. At present, there is a lack of automatic test device system for such sound characteristics. The actual test mainly uses auxiliary equipment such as integral sound level meter, 1 / 3 octave filter, rotating mechanical device, etc., according to the test method of GB / T12303-2009 standard. Do it manually. Therefore, there are the following disadvantages: the external 1 / 3 octave filter needs to manually select the test center frequency, and the process of findi...

AI Technical Summary

Problems solved by technology

At present, there is a lack of automatic test device system for such sound characteristics. The actual test mainly uses auxiliary equipment such as integral sound level meter, 1 / 3 octave filter, rotating mechanical device, etc., according to the test method of GB / T12303-2009 standard. done manually

Therefore, there are the following disadvantages: the external 1 / 3 octave filter needs to manually select the test center frequency, and the process of finding the basic frequency range is cumbersome; when measuring the sound radiation directivity of the whistle, manually move the position of the sound level The data points are limited, and there is no guarantee to find an effective minimum sound pressure level; when reading, the tester is placed in a high-decibel sound field, which endangers the tester's auditory system

They cannot measure the sound pressure level of large, oversized horns (>138dB)

Secondly, most commercially available sound level meters use analog circuits to implement signal 1 / 3 octave filters, frequency weighting networks, and time weighting, which have slow operation speed, low precision, small dynamic range, and high power consumption; Spectrum analysis, graphic display, data storage and printing of sound pressure can only be realized through the serial port of external supporting equipment. When they are used in the automatic test system for the sound characteristics of marine whistles, their flexibility is obviously insufficient

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