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Propeller shaft torsional vibration measuring method

A measurement method and technology of propulsion shaft, applied in the direction of measuring device, testing of mechanical components, testing of machine/structural components, etc., can solve the problems of unguaranteed testing accuracy and large errors, and achieve small attenuation and high measurement accuracy Improve and test the effect of accuracy guarantee

Active Publication Date: 2020-08-07
中国人民解放军91663部队
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. First, this method needs to convert the linear velocity of the propulsion shaft rotation into torsional vibration, and the exact shaft diameter of the propulsion shaft must be known in advance. There are large errors in the field test, and the test accuracy cannot be guaranteed;

Method used

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  • Propeller shaft torsional vibration measuring method
  • Propeller shaft torsional vibration measuring method
  • Propeller shaft torsional vibration measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: The instruments used in the torque test proposed by the present invention are general-purpose equipment on the market, mainly including a computer, a collector, a laser rotational speed sensor and a code tape.

[0054] A method for on-site measurement of ship propulsion shaft torsional vibration is characterized in that it comprises the following steps:

[0055] Step 1, paste the code tape on the propulsion shaft along the circumferential direction;

[0056] Step 2: When the propulsion shaft of the ship rotates and the code tape passes through alternately in light and dark, the torsional vibration signal of the propulsion shaft is obtained by collecting the time difference of the pulse signal of the code tape through the laser speed sensor;

[0057]Step 3. At this time, the laser speed sensor will generate electrical signals with different heights, which will be processed by the collector;

[0058] Step 4, input the electrical signal processed by the coll...

Embodiment 2

[0085] 1. The collector gets such Figure 5 For the pulse level signal shown, the sampling pulse frequency of the collector is f=32768Hz, and the number of code bands k=120 for one revolution of the rotating shaft.

[0086] 2. Use the collection to get Figure 5 For the level signal shown, directly calculate the time ti without considering the seam error of the end face of the code tape; calculate the instantaneous speed ni according to the formula (1); calculate the average speed n=4.15 rev / s according to the formula (2); according to the formula (3) The torsional vibration Ti is calculated; the results are shown in Table 1 and Figure 6 .

[0087] Table 1 does not consider the time, instantaneous speed and torsional vibration directly calculated by the end joint

[0088] i 1 2 3 4 5 6 7 8 9 … 119 120 t i (10 -2 Second)

[0089] 3. Obtained by using experimental collection Figure 5 For the level signal shown, the parameter μ=-0.2491 is calcu...

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Abstract

The invention discloses a propeller shaft torsional vibration measuring method. The method comprises the following steps of 1, flatly adhering code bands with reflection characteristics, which are alternately arranged at equal bright and dark intervals, to a propeller shaft along the circumferential direction, and through collecting code band pulse signals, acquiring a propeller shaft torsional vibration signal, 3, converting the propeller shaft torsional vibration signal into an electric signal which can be identified by a computer, 4, inputting the electric signal which can be identified bythe computer into the computer, and 5, accurately calculating the rotation angles of the propeller shaft and the code band according to the signals obtained by the computer, and obtaining the propeller shaft torsional vibration by calculating the function of the change of the rotation angle position of the code band along with time. The accurate shaft diameter of the propeller shaft does not needto be known in advance, the collected torsional vibration signals cannot be attenuated, and the test accuracy is improved.

Description

technical field [0001] The invention relates to the field of torsional vibration measurement, in particular to a method for measuring torsional vibration of a propulsion shaft. Background technique [0002] As the core component of the ship's main power plant, the ship's propulsion shaft transmits the power from the main engine to the propeller, makes the propeller rotate to generate thrust, and transmits the thrust generated by the propeller to the thrust bearing to provide power for the ship. It is mainly composed of thrust bearings, It is composed of intermediate shaft, intermediate bearing, stern shaft, stern bearing, paddle shaft and propeller. [0003] Torsional vibration is the key design index of the ship's propulsion shaft. Improper design of propulsion shaft torsional vibration may lead to shaft resonance, resulting in failure or catastrophic accidents of propellers, intermediate shafts, bearings, transmission gears, and main engines, with serious consequences. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/025G01M13/028
CPCG01M13/025G01M13/028
Inventor 古成中苏高辉罗日荣周志才陈洪春任富山李维刘卡柱
Owner 中国人民解放军91663部队