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Online quantitative recognition analysis method for loose fault of bearing support of rotor system

A bearing support and quantitative identification technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of few influencing factors and short paths, and achieve the reduction of influencing factors, accurate testing, and simple analysis and processing methods Effect

Active Publication Date: 2017-05-10
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] In view of the flaws and insufficiencies in the simulation method and fault carrier signal of the existing bearing support loose fault, the purpose of the present invention is to provide a new dynamic model establishment for the bearing support loose fault with a shorter path and fewer influencing factors Methods and Fault Carrier Signals

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  • Online quantitative recognition analysis method for loose fault of bearing support of rotor system
  • Online quantitative recognition analysis method for loose fault of bearing support of rotor system
  • Online quantitative recognition analysis method for loose fault of bearing support of rotor system

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Embodiment Construction

[0064] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0065] Such as figure 1 As shown, an online quantitative identification and analysis method for a loosening fault of a bearing support of a rotor system of the present invention includes the following steps:

[0066] 1) Use finite element analysis software to establish a bolt model with spiral threads and a basic model of the rotor system with spiral internal threaded holes, replace the bearing support with a mass block, and connect the bearing support with the basic model of the rotor system with bolts ;

[0067] 2) Perform loosening analysis on the bolt connection finite element model established in 1) to obtain the change law between bolt looseness and bolt tension, and further obtain the pressure distribution law of the joint surface of the bolt connection under different bolt tensions , That is, the law of the load distribution between the joint surfaces of ...

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Abstract

The invention provides an online quantitative recognition analysis method for a loose fault of a bearing support of a rotor system. The method comprises the following steps: 1) establishing a bolt model with spiral threads; 2) acquiring a change rule of load distribution between junction surfaces of screw connection following the loose amount; 3) acquiring the change rule of normal contact stiffness and damp of the junction surfaces of screw connection following the loose amount; 4) acquiring the change rule of equivalent stiffness and damp at the loose position following the loose amount; 5) establishing a dynamical model taking the loose bearing support as an object, thereby acquiring a relation between the loose amount of the bearing support and the oil film pressure endured by the bearing support; 6) acquiring the relation between the thickness distribution of a lubricating film and the loose amount; 7) monitoring the change rule of the thickness distribution of the lubricating film in a sliding bearing online in real time; 8) quantitatively recognizing and analyzing a loose fault signal of the bearing support online. According to the method provided by the invention, a dynamical model establishing method and a fault carrier signal with a shorter route and few influence factors are supplied for the loose fault of the bearing support.

Description

【Technical Field】 [0001] The invention relates to the technical field of failure mechanism analysis and diagnosis of a rotor system, in particular to an on-line quantitative identification and analysis method for the loosening fault of a rotor system bearing support for dynamic monitoring of the thickness of the lubricating film of the support bearing by optical fiber. 【Background technique】 [0002] Rotating machinery supported by sliding bearings (turbine power generation unit, gas turbine, nuclear power unit, rocket engine, fan) is widely used in energy, national defense, electric power, transportation, petrochemical and other fields as key equipment, and has played a pivotal role in these fields effect. Due to the influence of many factors, the rotating machinery will inevitably have some failures, which will reduce the performance of the equipment or directly lose its function. The failure of the rotating unit will cause a chain reaction, which will cause the entire equipmen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 张小栋郭琦牛杭
Owner XI AN JIAOTONG UNIV
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