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Hull Vibration Aging Method

A technology of vibration aging and hull, applied in the direction of improving process efficiency, etc., can solve the problems of not reaching the residual stress of the hull, impracticability of thermal aging of the hull, and inability to eliminate the residual stress of the hull, so as to solve the problem of hull quality Hidden problems, efficient treatment, and the effect of eliminating residual stress

Active Publication Date: 2019-06-25
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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  • Hull Vibration Aging Method
  • Hull Vibration Aging Method
  • Hull Vibration Aging Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] figure 1 The hull 2 ​​shown has a ship surface 202 and a ship bottom 201 located below the ship surface 202, and both ends of the ship surface 202 have two end angles. The hull vibration aging method is as follows: four support pads 103 are placed between the bottom 201 and the ground to keep the ship surface 202 level; two vibration meters 102 are placed at one end of the ship surface 202 along the length of the hull Near the edge of one end corner diagonal, use two vibration exciters 101, including the following steps:

[0016] The first step is to fix the two vibration exciters 101 along the length of the hull on the other end of the ship surface 202 of the hull 2 ​​at the same end diagonal as the vibrator 102, so that each exciter 101 The rotation directions of the motors are the same, and the two vibration exciters 101 are placed adjacent to each other; in this way, the excitation force of the vibration exciter can be doubled in the same position and direction;

[0017...

Embodiment 2

[0019] Place the three vibration detectors 102 along the length of the hull at the edge of one end of the ship surface 202 near the diagonal of the end corner, and use the three vibration exciters 101, including the following steps:

[0020] The first step is to fix the three vibration exciters 101 along the length of the hull on the other end of the ship surface 202 of the hull 2 ​​at the same end diagonal as the vibrator 102, so that each vibration exciter 101 The rotation direction of the motor is the same, and the three vibration exciters 101 are placed adjacent to each other; in this way, the excitation force of the vibration exciter can be doubled in the same position and direction;

[0021] The second step is to start the exciter 101 and control the vibration frequency of each exciter 101 to be the sub-resonant frequency fz of the hull 2. The three exciters 101 perform the same frequency resonance at the same time, and the hull 2 ​​is subjected to vibration aging Treatment: ...

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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 the residual welding stress of the ship hull. Background technique [0002] The hull is a large-scale welded structural part, which is huge in size and heavy in weight, some weighing tens of thousands of tons. This kind of structural part is composed of crisscrossed ribs and has many welded parts. After welding, there is a high distribution of complex residual stress. , The phenomenon of stress concentration is prominent, so it is necessary to eliminate these residual stresses. However, the existing thermal aging and vibration aging are unable to perform aging treatment to eliminate residual stress on the hull. Obviously, it is not feasible to build a thermal aging furnace for thermal aging of the hull. Conventional vibration aging methods use a single vibration exciter for treatment. Because the hull ...

Claims

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Application Information

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Patent Type & Authority Patents(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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