Automatic test device for sounding properties of seacraft hornpipe

Abstract

The invention discloses an automatic test device for sounding properties of a seacraft hornpipe. The automatic test device comprises a stander, an installation platform, a horizontal rotating mechanism, an azimuth adjusting mechanism, a to-be-tested seacraft hornpipe, a sound pressure sensor, a measurement and control communication unit and a principal computer, wherein the principal computer is used for controlling the horizontal rotating mechanism to rotate a circle at a preset stepping angle through the measurement and control communication unit, when the horizontal rotating mechanism rotates by one stepping angle, the principal computer controls the to-be-tested seacraft hornpipe to sound for 4s to 5s, the principal computer also controls the sound pressure sensor to collect an audio signal transmitted by the to-be-tested seacraft hornpipe in the sounding period of the hornpipe and transmit the audio signal to the principal computer, the audio signal is processed by the principal computer to obtain a 1 / 3 frequency multiplication sound pressure distribution diagram, and a basic frequency scope of the sound and a weighting sound pressure grade in the basic scope can be acquired from the distribution diagram. The automatic test device is simple in structure, foldable and convenient to carry and capable of improving the test efficiency of the hornpipe sound pressure performance and enabling a measure result to be 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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