Local noise measuring device of water jet propulsion system

The invention discloses a local noise measuring device for a water jet propulsion system. The water jet propulsion system comprises a stern board flange, an impeller shell connected with the stern board flange, a guide vane body connected with the impeller shell and a nozzle connected with the guide vane body, and the impeller shell and the guide vane body form an outer shell for containing an impeller; the impeller is characterized in that mounting holes are formed in the nozzle, the middle of the guide vane body and the middle of the impeller shell and used for mounting a hydrophone, and the hydrophone is connected to a multi-channel signal collector through a data collection line. The water jet propulsion system noise measuring device provided by the invention can measure the hydrodynamic noise of a water jet propulsion real ship, and can also measure the noise of a water jet propeller. Compared with the existing method, the method has the biggest difference that the method is simple in arrangement form an