A measurement method of ship radiated noise

Abstract

The invention provides a measurement method of radiation noise of a ship and relates to the noise measurement. The method comprises steps of forming a deep sea submerged buoy by use of an underwater positioning beacon, a hydrophone array and a depth sensor system; carrying out synchronization by use of a clock of a GPS system before the clocks of the hydrophone array and the depth sensor system are put in water; arranging the underwater positioning beacon near an upper floating body; arranging the deep sea submerged buoy in the sea and parking the to-be-measured ship for standby after the to-be-measured ship is motorized to be near to an actual position of the deep sea submerged buoy from an entry place of a cement block along the path of a connection line of the cement block and the upper floating block in the direction before the diving of the upper floating body; carrying out measurement on underwater positioning of the upper floating body; after determining the position of the upper floating body, positioning the to-be-measured ship when the to-be-measured ship is away from the upper floating body for 1000m and gets close to a perpendicular bisector of the connection line of the hydrophone array, and continuing to record differential GPS positions of the ship; correcting the horizontal position of the hydrophone array; and after the correction, calculating the distances between the to-be-measured ship and different hydrophone arrays, and by use of sound signals recorded by the hydrophone arrays, giving the radiation noise of the to-be-measured ship after conversion based on the distances.

Description

technical field [0001] The invention relates to noise measurement, in particular to a method for measuring ship radiation noise. Background technique [0002] The underwater noise of my country's merchant ships is much higher than that of developed countries. The international community has paid more and more attention to the underwater noise of merchant ships. The International Maritime Organization (IMO) and China Classification Society (CCS) have issued the "Guidelines for Reducing the Adverse Effects of Underwater Noise Caused by Commercial Shipping on Marine Life" (MEPC.1Circ .833), which includes how to predict underwater noise levels, etc.; the National Development and Reform Commission, the Ministry of Industry and Information Technology, and the Ministry of Communications also issued a "Letter on Soliciting Research Suggestions on Underwater Noise" in 2014. There are few studies on underwater noise, and there are no conditions for large-scale underwater noise testi...

AI Technical Summary

Problems solved by technology

The measurement results of volume sound sources depend on the specific measurement distance, and there will be obvious differences with the performance of the sound source in the far field, which will damage the practical value of the measurement results

Finally, the shallow sea measurement requires that there is no interference from other ships within 5 nautical miles, which is becoming more and more difficult to guarantee in the case of increasingly frequent sea activities in recent years