Exciting load loading method for water-jet propeller

A water jet propulsion, water jet propulsion technology, applied to ship components, ships, transportation and packaging, etc., can solve problems such as excitation loading

Active Publication Date: 2020-01-14
708TH RES INST OF CSSC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Exciting load loading method for water-jet propeller
  • Exciting load loading method for water-jet propeller
  • Exciting load loading method for water-jet propeller

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Experimental program
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Embodiment approach

[0048] As a preferred embodiment of the present invention, the monitoring points include the first pressure monitoring group, the second pressure monitoring group and the third pressure monitoring group, and the first pressure monitoring group, the second pressure monitoring group and the third pressure monitoring group are all set Several pressure monitoring points;

[0049] The first pressure monitoring group is arranged on the water inlet section of the flow channel, the second pressure monitoring group is arranged on the impeller section, and the third pressure monitoring group is arranged on the water outlet section of the flow channel. Specifically, 8 pressure monitoring points are uniformly set in each section, and there are 24 monitoring points in three sections.

[0050] Through Fourier transform, the time-domain results of the pulsating pressure at the 24 monitoring points obtained by the above-mentioned measurement and acquisition are converted into frequency-domain...

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Abstract

The embodiment of the invention discloses an exciting load loading method for a water-jet propeller. The method comprises the steps of constructing a water-jet propelling system model on the basis ofa hydrodynamic principle; controlling the water-jet propelling system model to run through hydrodynamic computing software, and collecting pulsating pressure values on monitoring points on a runner wall when a runner of the water-jet propeller is stable; converting time-domain data of the pulsating pressure values into frequency-domain data through Fourier transformation, analyzing the frequency-domain data, and obtaining exciting pulsating pressure amplitudes and pulsating pressure phase angles corresponding to impeller blade frequencies on the monitoring points; building a dynamic analysis model of the hull tail structure; loading the pulsating pressure amplitude and the pulsating pressure phase angles to the runner of the dynamic analysis model. Frequency-domain loading of water-jet propeller exciting force is achieved, the purposes of obtaining and loading exciting loads of a water-jet propelling type ship are achieved, and therefore the hull vibration response condition is controlled.

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...

Claims

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Application Information

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IPC IPC(8): B63B71/10
Inventor 赵超徐志亭夏益美李聪马云飞
Owner 708TH RES INST OF CSSC
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