A Method for Assessing the Looseness of Flange Bolted Connections
A connection structure and looseness technology, which is applied in the testing of machines/structural components, vibration testing, and testing of mechanical components, etc., can solve problems such as difficulty in detecting changes in preload state, limited application range, and limited detection range, etc., to achieve Reliable results, easy operation and strong implementability
Active Publication Date: 2021-05-28
XI AN JIAOTONG UNIV
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Problems solved by technology
Based on the electromechanical impedance method, the bolt pretightening force is determined by monitoring the change of the mechanical impedance of the bolted joint. The detection range is limited and an expensive high-precision impedance analyzer is required, and the application range is limited.
Based on the computer vision method to identify bolt looseness based on the circumferential displacement of the bolt, it is difficult to detect small-scale changes in the preload state, and the accuracy is low
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[0042]In order to make the objects, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be described in connestly and complete, and the described embodiments will be described in connection with the accompanying drawings. Embodiments. Based on the embodiments of the present invention, there are all other embodiments obtained without making creative labor without making creative labor premises.
[0043]Based on the vibration response method according to the response information generated by the bolt connection structure in the external excitation, the bolt connection structure characteristics are determined, and the degree of looseness of the bolt connection is provided is convenient and effective. When the bolt connection structure is loose, the dynamic characteristics of the structure, such as rigidity, damping, etc., which are shown in the external excitation, and the internal mode of the bolt connection struc...
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The invention discloses a method for evaluating the looseness of a flange bolted connection structure, which comprises the following steps: Step 1: Randomly excite the bolted connection structure to obtain a state subspace; Step 2: Project the state subspace obtained in Step 1 Obtain state projection matrix, described state projection matrix comprises normal state projection matrix and loose state projection matrix; Step 3: the normal state projection matrix that step 2 obtains is modeled based on nuclear support vector data description method, obtains hypersphere model; Step 4: Construct the looseness index according to the hypersphere model obtained in step 3; Step 5: Determine the degree of looseness of the bolted connection structure according to the looseness index constructed in step 4. The invention has the characteristics of reliable results, easy operation, low cost and strong implementability, is suitable for real-time evaluation of the looseness degree of the bolt connection structure on site, is beneficial to improving the reliability and safety of the structure, and has important engineering practical value.
Description
Technical field[0001]The present invention belongs to the method of determining a mechanical structure Health state, and there is a method of evaluating a loose degree of assessment of the flange bolt connection structure.Background technique[0002]As a most commonly used pre-tightening structure, the bolt connection structure has the advantages of good rigidity, simple structure, convenient installation, and reliable connection, and wide range of aerospace and weapon equipment. During the actual use, the bolt connection structure will inevitably happen to be loose in the effect of environmental factors such as temperature and vibration. The bolt connection structure loose will affect the sealing, stability, and safety of the overall structure, causing a decrease in the reliability of the overall structure. Therefore, the loose characteristics of the bolt connection structure are studied, and it is determined that the looseness is important to improve structory reliability, improve s...
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IPC IPC(8): G01M13/00G01M7/02G06F30/20G06F30/17G06F17/16G06F111/10
CPCG01M7/02G01M13/00G06F17/16
Inventor 张周锁洪宇杰杨文展陈旭马玉琼
Owner XI AN JIAOTONG UNIV