A kind of excitation load loading method of water jet propulsion

Abstract

The embodiment of the present invention discloses an excitation load loading method of a water jet propulsion device, which includes the steps of: constructing a water jet propulsion system model based on hydrodynamic principles; controlling the operation of the water jet propulsion system model through hydrodynamic calculation software, and When the flow channel of the water jet propeller is stable, the pulsating pressure value on each monitoring point on the flow channel wall is collected; the time domain data of the pulsating pressure value is converted into frequency domain data by Fourier transform, and the frequency domain data is analyzed , get the excitation pulsating pressure amplitude and pulse pressure phase angle corresponding to the impeller blade frequency at each monitoring point; establish the dynamic analysis model of the hull tail structure; load the pulsating pressure amplitude and pulse pressure phase angle on the dynamic analysis model On the flow channel, the frequency-domain loading of the excitation force of the waterjet propulsion is realized, which solves the problem of acquisition and loading of the excitation load for ships using waterjet propulsion, so that the vibration response of the hull can be controlled to a certain extent.

Description

technical field [0001] The invention relates to the field of dynamic analysis and evaluation of hull structures, in particular to an excitation load loading method of a water jet propeller. Background technique [0002] In recent years, water jet propulsion devices have been widely used in the field of high-speed and high-performance ships. Compared with traditional propeller propulsion, water jet propulsion has many advantages such as strong anti-cavitation ability, low vibration and noise, strong ability to adapt to variable working conditions, high propulsion efficiency, and excellent maneuverability. [0003] In China, water jet propulsion devices are generally used for small high-speed ships such as monohulls, planing boats, catamarans, and trimarans. These ships have the characteristics of small tonnage and small ship size, and their aspect ratio is average smaller. This type of ship is sensitive to the vibration under the excitation source, and its vibration perform...

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Problems solved by technology

How to obtain the pulsating pressure value of the waterjet propeller and how to load the excitation in the flow channel at the beginning of the design, when the information is incomplete, there are no relevant reports in China.

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