Method for testing and measuring modal parameters of ship propeller rotor under real prestress

A technology of modal parameters and measurement methods, which is applied in the field of ships and marine engineering, can solve problems such as the increase of rotor modal parameter errors, and achieve high accuracy and practicability

Active Publication Date: 2021-08-27
708TH RES INST OF CSSC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This means that as the thrust and speed of the marine propeller rotor increase, the error of the rotor modal parameters based on the static state measurement also increases

Method used

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  • Method for testing and measuring modal parameters of ship propeller rotor under real prestress
  • Method for testing and measuring modal parameters of ship propeller rotor under real prestress
  • Method for testing and measuring modal parameters of ship propeller rotor under real prestress

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Embodiment Construction

[0036] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0037] The present invention provides a modal parameter test and measurement method for a marine propeller rotor under real prestress. The complete test process includes four parts: test principle, test facility and instrument layout, test process, and data processing, which are now described in detail as follows.

[0038] (1) Test principle

[0039] First of all, the test should ensure that the marine propeller rotor is in th...

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Abstract

The invention relates to a method for testing and measuring modal parameters of a ship propeller rotor under real prestress. The method comprises the following steps: designing a whole test flow, namely deducing a test principle, selecting and arranging test facilities and instruments, arranging the test flow, processing test data and the like, and finally, the purpose of measuring the modal parameters of the ship propeller rotor under the real prestress is achieved. According to the method provided by the invention, with the help of test facilities such as a circulating water tank or a towing tank commonly used in the ship and ocean engineering field, the rotor is enabled to be in a stress state the same as that in a real working state by setting the inflow speed and the rotation speed of the rotor of the propeller in a flow field, and meanwhile, modal parameters are measured, so that the modal parameters of the rotor in a real stress state can be accurately obtained. Compared with a common marine propeller rotor modal parameter test at present, the measurement method provided by the invention better conforms to the actual working condition of the rotor, and the measurement result has higher accuracy and practicability.

Description

technical field [0001] The invention relates to a modal parameter test and measurement method under real prestress of a marine propeller rotor, which belongs to the technical field of ships and marine engineering. Background technique [0002] The marine propeller rotor refers to the rotating working parts such as propellers or impellers used for ship propulsion. These parts are rotated by the shaft system, and the water flow is discharged to the rear of the ship's sailing direction, so as to obtain the thrust that makes the ship move forward and push the ship forward. On the one hand, due to the low noise requirements of ship propulsion, and on the other hand, due to the vibration verification requirements of the shafting design, it is necessary to predict the natural frequency of the propeller or impeller during the design process. [0003] At present, the prediction of the natural frequency of this type of rotor is mostly obtained through the modal test of its scale mode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B71/20B63B71/00
CPCB63B71/20B63B71/00Y02T90/00
Inventor 刘正浩丁举毛献群朱健申赵建
Owner 708TH RES INST OF CSSC
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