Electromagnetic Nondestructive Tomography Detection Of Carbon Fiber Wrapped Bottle

Carbon fiber winding bottle can be used as hydrogen energy storage containers for new energy vehicles due to their advantages of light weight,high strength,good fatigue resistance,and long working life.Carbon fiber winding bottle belong to special equipment.Under the action of high cycle fatigue load,physical shock,etc.,It is prone to structural defects that cause major accidents such as explosions and poisoning.Electromagnetic Tomography(EMT,Electromagnetic Tomography)is a process tomography technology based on the principle of electromagnetic induction,It can reconstruct the object field image of substances with electromagnetic properties.Electromagnetic tomography has the advantages of non-contact,low cost,no radiation,no coupling agent,visualization,etc.,and it is suitable for evaluating the integrity of the Carbon fiber winding bottle structure.According to the detection requirements of carbon fiber winding bottle,the thesis has conducted in-depth research on its electromagnetic tomography detection technology from two aspects: sensor array design and optimization and electromagnetic imaging algorithm optimization.Aiming at the characteristics of the multi-layer heterogeneous structure of the carbon fiber winding bottle,the thesis has designed a new 8-coil U-shaped sensor array by studying the coil arrangement of the sensor array,used the finite element simulation results to optimize the sensor’s geometric parameters and excitation measurement mode.In order to improve detection results and improve the quality of reconstructed images.Regarding the image reconstruction algorithm,in view of the uneven distribution of the sensitivity matrix and the existence of peak areas,a dual-field control Landweber iterative image reconstruction algorithm with sinusoidal current excitation was proposed,the imaging quality of different imaging algorithms was compared through image error and correlation coefficient.The results show that the designed sensor array can meet the requirements of EMT detection of carbon fiber winding bottle,and the proposed algorithm can effectively improve the imaging quality.Carried out the defect detection experiment of carbon fiber winding bottle.According to the sensor optimization plan,designed and realized the EMT detection experiment system of carbon fiber winding bottle,and carried out data collection experiments on the defects of carbon fiber winding bottle.Used different image reconstruction algorithms to reconstruct the collected data,and compared the results of different imaging algorithms.The results show that the designed system can accurately evaluate and monitor the structural integrity and safety of carbon fiber winding bottle,and prove the feasibility of applying electromagnetic tomography technology to the non-destructive testing of carbon fiber winding bottle.