Sensor and design method for fatigue life monitoring of mechanical parts under multi-axial loads
A technology for mechanical parts and monitoring sensors, applied in computer-aided design, design optimization/simulation, instruments, etc., can solve problems such as fatigue life foil uniaxial life prediction, and achieve the effect of solving monitoring difficulties and broadening application fields
Active Publication Date: 2021-06-08
DALIAN UNIV OF TECH
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Problems solved by technology
The multi-axial fatigue damage state monitoring of the structure is realized by the combination of multiple fatigue life foils, which solves the problem that the current fatigue life foil can only perform uniaxial life prediction, and broadens the application field of the fatigue life foil; a life monitoring method is proposed The sensor structure design model can flexibly adjust the sensor structure in combination with the load characteristics of the engineering structure; a structural multi-axis fatigue life monitoring model is proposed, which can obtain the cumulative fatigue damage and remaining fatigue life of the structure in real time according to the cumulative change of the fatigue life foil resistance, ensuring that the mechanical The equipment works safely and reliably, with good real-time performance and practicality
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[0037] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions.
[0038] Figure 5 It is a schematic diagram of the specific work of the sensor for monitoring the remaining fatigue life of mechanical parts. The life monitoring sensor S is installed on the surface of the mechanical part M to be tested, and the mounting foot G and the fixed support B of each supporting arm A are used to bear the surface stress of the mechanical part M under test. Extract the uniaxial stress on the surface of the mechanical part M, so that each fatigue life foil E can record the unidirectional load history of the surface of the mechanical part under test, and the cumulative change in resistance of each fatigue life foil E can be recorded through the wireless node D It is transmitted to the computer monitoring platform to realize the monitoring of the multi-axis fatigue life of the structur...
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The invention provides a fatigue life monitoring sensor and design method of mechanical parts under multi-axial loads, which can realize the fatigue life state of mechanical parts with fatigue life foil, and belongs to the technical field of mechanical structure fatigue monitoring. The fatigue life monitoring sensor mounting feet and fixed supports arranged on the surface of mechanical parts bear the multiaxial stress on the surface of the parts, and the fatigue life foil on each bearing cantilever bears the unidirectional stress of the structural surface in real time, and cyclically loads the surface of the mechanical parts The history is converted into the cumulative change of resistance of the fatigue life foil in real time, and through the multi-axis fatigue life monitoring model proposed by the present invention, the measured position of the mechanical parts is obtained according to the monitored cumulative change of resistance of the fatigue life foil on each load-carrying cantilever The multi-axis fatigue life status is transmitted to the computer monitoring platform through wireless nodes, even if it is fed back to the staff, to accurately evaluate the structural health status, prevent unexpected accidents, and ensure the safe operation of mechanical equipment.
Description
technical field [0001] The invention relates to a sensor for monitoring the local remaining fatigue life of mechanical components under multi-axial loads and a design method thereof, belonging to the technical field of mechanical structure fatigue monitoring. Background technique [0002] Fatigue refers to the phenomenon that when a structure is subjected to cyclic loads, a certain point or points of the structure produce local permanent damage, and form cracks or even completely break after a certain number of cycles. The fatigue life monitoring of mechanical structures has always been an important topic in the mechanical field. The failure of complex mechanical systems, such as accidents in aircraft engines, automobiles, nuclear power plants, and large tunnel boring machines, will cause heavy casualties, huge economic losses, and environmental damage. According to statistics, 50%-90% of mechanical structure damage is caused by fatigue damage. Therefore, how to effectively ...
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IPC IPC(8): G01N3/32G01N3/02G06F30/20G06F119/04G06F119/14
CPCG01N3/02G01N3/32G06F30/20G06F2119/04G06F2119/14
Inventor 霍军周张伟
Owner DALIAN UNIV OF TECH