Gravity type propeller noise measuring device

Abstract

The invention provides a gravity type propeller noise measuring device. The device comprises a high-level water tank, an experimental water tank and a reservoir which are connected in sequence througha water pipe, a long-shaft dynamometer, a propeller and a hydrophone are mounted in the experimental water tank, the hydrophone is connected with a computer, the reservoir is divided into two parts,one part is an open part, the other part is a closed part, a partition plate is arranged between the two parts, an air bag is arranged in the closed part, the open part is connected with the experiment water tank and is provided with a first valve on a communication water pipe, and the closed part is connected with the high-level water tank and is provided with a second valve on the communicationwater pipe. According to the gravity type propeller noise measuring device provided by the invention, by grading utilization of the reservoir, a noise measuring experiment is separated from circulating water, and collected rainwater is utilized to carry out the experiment, thereby reducing the operation of a motor during water circulation, reducing the influence of background noise on the experiment, and enabling an experiment result to be more authentic and more reliable.

Description

technical field [0001] The invention relates to a propeller noise detection device. Background technique [0002] Ship noise comes from three major noise sources—propeller noise, mechanical noise and hydrodynamic noise. Among the three major noise sources, propeller noise contributes the most to the total noise. Generally, propeller noise is divided into thickness noise, load noise and cavitation noise. Once cavitation occurs in the propeller, with the development of cavitation, propeller cavitation noise will become the most important part of the total ship noise. The commonly used method of measuring propeller noise in circulating water tanks has to face the influence of background noise on the experiment, because circulating water tanks usually use motors to realize water recycling, and the motors that circulate water often work at the same time as the motors that rotate the propellers. This increases the impact of environmental noise on the experiment. Contents of th...

AI Technical Summary

Problems solved by technology

The commonly used method of measuring propeller noise in circulating water tanks has to face the influence of background noise on the experiment, because circulating water tanks usually use motors to realize water recycling, and the motors that circulate water often work at the same time as the motors that rotate the propellers. This increases the impact of environmental noise on the experiment

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