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Vibration aging method for offshore drilling platform

An offshore drilling platform and vibration aging technology, applied in the field of vibration aging, can solve the problems of infeasibility of thermal aging, inability to eliminate residual stress of ocean drilling platform, and inability to effectively eliminate residual stress of ocean drilling platform, so as to achieve high processing efficiency and solution Hidden dangers of quality problems and the effect of eliminating residual stress

Active Publication Date: 2019-06-04
NANNING SHENHUA VSR TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing thermal aging and vibration aging cannot perform aging treatment for the elimination of residual stress on offshore drilling platforms.
Obviously, it is not feasible to build a thermal aging furnace for thermal aging of offshore drilling platforms, and the conventional vibration aging method uses a single vibrator for processing. Since the offshore drilling platform is very heavy, the exciting force of a single vibrator It is difficult to obtain the dynamic stress required for resonance of the offshore drilling platform. After the dynamic stress and the residual stress are superimposed, the yield limit of the material cannot be exceeded, and the purpose of effectively eliminating the residual stress of the offshore drilling platform cannot be achieved. Eliminating the residual stress of the offshore drilling platform is practical The above is a long-standing worldwide technical problem in the offshore drilling platform manufacturing industry

Method used

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  • Vibration aging method for offshore drilling platform
  • Vibration aging method for offshore drilling platform
  • Vibration aging method for offshore drilling platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] figure 1 The shown ocean drilling platform 2 has a platform 202 and a platform bottom 201, and the platform 202 of the ocean drilling platform 2 is a quadrilateral; use 4 support pads 103 to be placed between the platform bottom 201 and the supporting surface, so that the platform 202 of the ocean drilling platform maintains Horizontally, set the vibrator 102 at a corner of the table 202, using two vibrators 101, including the following steps:

[0015] The first step is to fix the two vibrators 101 at a corner opposite to the countertop 202 of the offshore drilling platform 2 and the vibrator 102, so that the motors of each vibrator 101 rotate in the same direction, and the two exciters Vibrators 101 are adjacently arranged; like this, the exciting force of the vibrator can be doubled in the same position and in the same direction;

[0016] The second step, start the vibrator 101, control the vibration frequency of each vibrator 101 to be the sub-resonance frequency fz...

Embodiment 2

[0018] Use three exciters 101, including the following steps:

[0019] The first step is to fix the three vibrators 101 at a corner opposite to the countertop 202 of the offshore drilling platform 2 and the vibrator 102, so that the motors of each vibrator 101 rotate in the same direction. Vibrators 101 are adjacently arranged; like this, the exciting force of the vibrator can be doubled in the same position and in the same direction;

[0020] The second step, start the vibrator 101, control the vibration frequency of each vibrator 101 to be the sub-resonant frequency fz of the ocean drilling platform 2, and three vibrator 101 carry out the same frequency resonance at the same time, and the ocean drilling platform 2 is carried out Vibration aging treatment; the vibration aging treatment time is 5 hours, and the vibration acceleration value can be controlled during the vibration aging process to be 20m / s²-120m / s²; other features are the same as in embodiment 1.

[0021] Contro...

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Abstract

The invention discloses a vibration aging method for a marine drilling platform, and relates to the technical field of stress relief treatment for steel structural parts. The marine drilling platformis a large welded structural part, and it is difficult for existing thermal aging and vibration aging methods to perform aging treatment on the marine drilling platform. According to the vibration aging method for the marine drilling platform, a plurality of vibration exciters are adjacently fixed to the marine drilling platform, then the vibration exciters are started and controlled and have thesame subresonant frequency in the marine drilling platform, at the same time, the same frequency subresonance vibration is carried out to effectively eliminate residual stress, and the average elimination ratio of the residual stress can reach 44.5%, so that the technical problem that the residual stress is difficult to eliminate by the marine drilling platform is solved; and the vibration agingmethod for the marine drilling platform can be used in marine drilling platform manufacturing industries.

Description

technical field [0001] The invention relates to the technical field of stress relief treatment of steel structural parts, in particular to a vibration aging method for eliminating welding residual stress of an ocean drilling platform. Background technique [0002] The offshore drilling platform is a large-scale welded structural part, which is bulky and heavy, and some weigh tens of thousands of tons. This structural part is composed of criss-cross ribs and has many welding parts. After welding, there are high residues with complex distribution. The phenomenon of stress concentration is prominent, so it is necessary to eliminate these residual stresses. However, the existing thermal aging and vibration aging cannot perform aging treatment for eliminating residual stress on offshore drilling platforms. Obviously, it is not feasible to build a thermal aging furnace for thermal aging of offshore drilling platforms, and the conventional vibration aging method uses a single vibr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00
CPCC21D10/00
Inventor 杨胜锋杨坤熊文府李艳杨秀山黄华欢骆源岑杰田小艳杨琳俪杨宇光
Owner NANNING SHENHUA VSR TECH RES INST
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