Vibration ageing method for ship body

A vibration aging and hull technology, applied in the direction of improving process efficiency, can solve the problems of unreachable hull residual stress, unfeasible hull thermal aging, and inability to eliminate residual stress on the hull, and achieve a solution to the quality of the hull. Hidden problems, elimination of residual stress, and efficient treatment

Active Publication Date: 2018-06-05
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 are unable to perform aging treatment on the hull to eliminate residual stress.
Obviously, it is not feasible to build a thermal aging furnace for the thermal aging of the hull, and the conventional vibration aging method uses a single exciter for treatment. Due to the heavy hull, it is difficult to obtain the excitation force of a single exciter. The dynamic stress required to resonate the hull, after the dynamic stress and the residual stress are superimposed, cannot exceed the yield limit of the material, and the purpose of effectively eliminating the residual stress of the hull cannot be achieved. Eliminating the residual stress of the hull is actually a long-term goal of the shipbuilding industry. A worldwide technical problem exists

Method used

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  • Vibration ageing method for ship body
  • Vibration ageing method for ship body
  • Vibration ageing method for ship body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] figure 1 The hull 2 ​​shown has a deck 202 with two end corners at each end and a bottom 201 below the deck 202 . The vibration aging method of the hull is as follows: use 4 support pads 103 to place between the bottom 201 and the ground to keep the deck 202 level; Near the edge of a corner diagonal line, use two exciters 101, including the following steps:

[0016] The first step, two vibrators 101 are fixed on the other end of the same end angle diagonal line of the vibrator 102 on the deck 202 of the hull 2 ​​along the hull length direction, so that each vibrator 101 The motors rotate in the same direction, and the two exciters 101 are placed adjacent to each other; in this way, the excitation force of the exciter can be doubled at the same position and in the same direction;

[0017] The second step, start the vibrator 101, control the vibration frequency of each vibrator 101 to be the sub-resonance frequency fz of the hull 2, and the two vibrators 101 simultaneou...

Embodiment 2

[0019] Three vibrators 102 are placed on the edge of one end of the ship deck 202 near a corner diagonal line along the length direction of the hull, and three vibrators 101 are used, including the following steps:

[0020] The first step, three vibrators 101 are fixed on the other end of the same end angle diagonal line of the vibrator 102 of the ship deck 202 of the hull 2 ​​along the hull length direction, so that each vibrator 101 The direction of rotation of the motors is the same, and the three exciters 101 are placed adjacent to each other; in this way, the exciting force of the exciters can be doubled at the same position and in the same direction;

[0021] The second step, start the vibrator 101, control the vibration frequency of each vibrator 101 to be the sub-resonance frequency fz of the hull 2, and the three vibrators 101 simultaneously perform the same frequency resonance, and perform vibration aging on the hull 2 Treatment; the vibration aging treatment time is...

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Abstract

The invention discloses a vibration ageing method for a ship body, and relates to the technical field of stress-removal treatment of steel structural parts. The ship body is a large welding structuralpart, and an existing thermal-ageing and vibration-ageing method is difficult to perform ageing treatment on the ship body. The vibration ageing method is characterized in that a plurality of vibration exciters are fixedly arranged on the ship body in an adjacent mode, and then are started and controlled; and same-frequency sub-resonance vibration is performed while the ship body has same sub-resonance frequency, so that the purpose of effectively eliminating residual stress is achieved with an average residual stress eliminating rate of 47.5%, and therefore, the technical problem that residual stress of the ship body is difficult to eliminate is solved, and the vibration ageing method can be applied in the ship-making industry.

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 residual stress of hull welding. Background technique [0002] The hull is a large 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 is a high residual stress with complex distribution. , the phenomenon of stress concentration is prominent, so it is necessary to eliminate these residual stresses. However, neither the existing thermal aging nor vibration aging can perform aging treatment on the hull to eliminate the residual stress. Obviously, it is not feasible to build a thermal aging furnace for the thermal aging of the hull, and the conventional vibration aging method uses a single exciter for treatment. Due to the heavy hull, it is difficult to obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00
CPCC21D10/00Y02P10/20
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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