金屬磁記憶—磁巴克豪森噪聲融合檢測應力系統(tǒng)的研究及應用
[Abstract]:Because of welding, casting and long-term service of ferromagnetic components, there will be internal stresses. These internal stresses have a great influence on the physical properties of ferromagnetic components. For example, welding stress in welding process; impact stress in explosion impact process; thermal stress caused by thermal expansion and cold contraction. Typical engineering problems such as longitudinal temperature stress of CWR, stress of welded steel plate structure and so on. Therefore, it is necessary to detect the internal stress of ferromagnetic components. Based on the detection principle of metal magnetic memory (MMM) method and magnetic Barkhausen noise (MBN) method, this paper combines the advantages of the two detection methods to perform on-line, nondestructive, fast stress detection and stability analysis for ferromagnetic materials. The main research contents are as follows: 1. Using the average volume (AVMBJ), of the magnetic Barkhausen jump released by the irreversible displacement of the magnetic domain wall and the relationship between the irreversible susceptibility and the stress of the ferromagnetic member under the action of the alternating magnetic field. The mathematical relationship between the mean volume of magnetic Barkhausen jump and the stress and excitation magnetic field is deduced. The displacement process of single crystal domain wall under the action of stress and magnetic field is analyzed, and the effect of excitation magnetic field and stress on the average volume of magnetic Barkhausen jump is explained. According to the different saturation velocity of magnetic Barkhausen jump curve of ferromagnet under tension and compression stress, the critical magnetic field concept of magnetic domain wall displacement is introduced. The problem of supersaturated calibration of magnetic Barkhausen jump signal with the change of stress is solved. 2. According to the principle of metal magnetic memory and magnetic Barkhausen noise, a special sensor for ferromagnetic component stress detection is designed and fabricated. And the primary signal processing circuit: excitation circuit, amplifier circuit and secondary signal processing circuit: data acquisition circuit. The high performance processor is used to realize rich man-machine interface. Automatic control technology is used to switch metal magnetic memory and magnetic Barkhausen noise working system to realize automatic detection. 3. The principle and realization method of metal magnetic memory and magnetic Barkhausen noise detection are studied, and the advantages of the two methods are combined. In order to meet the requirements of large area, long time consuming and real time of stress detection in some special ferromagnetic components, a fast stress detection method based on magnetic memory, magnetic Barkhausen noise fusion, is proposed. The following studies have been completed: (1) the welding stress distribution of E36 and CCSB grade marine steel plates is analyzed; The welding stress of E36 steel plate experimental cabin before and after blasting impact was analyzed. The welding stress of CCSB steel plate impact test bench is analyzed. (2) the variation law of temperature stress of seamless track is studied, according to the principle of virtual work of static balance, the strength and stability condition of the line, The dam model and energy calculation formula for the stability of CWR are established. Using this formula to calculate the current storage energy of CWR, the stability of the track is explained from the point of view of energy. (3) based on the discrete short time Fourier transform (DSTFT) method, a new method for detecting and evaluating the global and local stability of CWR is proposed. The mathematical formula of stability evaluation is established. (4) based on the on-line measurement of the temperature stress of the seamless track and the field rail temperature, the numerical calculation relationship of the actual lock-in rail temperature of the seamless track is established, and the on-line implementation method of the actual lock-in rail temperature detection is determined.
【學位授予單位】:北京化工大學
【學位級別】:博士
【學位授予年份】:2015
【分類號】:TG404;TG115
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