用于电磁加载的脉冲激励源设计

发布时间：2018-03-09 04:14

本文选题：电磁加载　切入点：脉冲激励源　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：对金属结构进行电磁加载,会在裂纹处产生应力波信号,利用该现象可以实现对金属缺陷的无损检测。脉冲激励源作为电磁加载装置的核心部件,其输出电流的幅值、频率等参数对电磁加载效果的影响显而易见。针对电磁加载的实验要求,确定了脉冲激励源的设计要求:脉冲输出频率在低频范围内连续可调,峰值电流在1200A以内可调,脉冲宽度为10~50?s之间。首先,本课题基于半桥型开关电路原理,采用恒频脉宽调制的控制方式,设计了以MOSFET为核心的可调稳压电源。其次,采用聚丙烯电容器作为储能电容,以MTC500-16为主开关器件构建了电容充放电回路,并采用STC89C52单片机系统实现了主回路的频率调节、显示与驱动信号输出。最后,对脉冲激励电源进行联合调试,其输出结果达到了设计要求。该电源可分别工作于直流可调稳压电源和脉冲激励源两种模式。作为稳压电源,其可实现0~300V之间连续可调。作为脉冲激励源时,最大输出峰值电流可达1500A,应用于电磁加载实验中,可以方便地实现单次加载和连续多次重复加载,有利于电磁加载疲劳实验的顺利开展。
[Abstract]:Electromagnetic loading on metal structure will produce stress wave signal at the crack, which can be used to realize nondestructive detection of metal defect. As the core component of electromagnetic loading device, pulse excitation source is the amplitude of output current. The influence of frequency and other parameters on the effect of electromagnetic loading is obvious. According to the experimental requirements of electromagnetic loading, the design requirements of pulse excitation source are determined: the pulse output frequency is continuously adjustable in the low frequency range, the peak current is adjustable within 1200A, The width of the pulse is 10? First of all, based on the principle of half-bridge switch circuit and the control mode of constant frequency pulse width modulation, the adjustable voltage stabilized power supply with MOSFET as the core is designed. Secondly, polypropylene capacitor is used as energy storage capacitor. The capacitive charging and discharging circuit is constructed with MTC500-16 as the main switch device, and the frequency regulation, display and drive signal output of the main circuit are realized by using the STC89C52 single-chip microcomputer system. Finally, the pulse excitation power supply is debugged jointly. The output results meet the design requirements. The power supply can be operated in two modes of DC adjustable steady voltage power supply and pulse excitation source respectively. As a stable voltage source, it can be continuously adjustable between 0 ~ 300V and can be used as a pulse excitation source. The maximum output peak current can reach 1500A, which can be used in the electromagnetic loading experiment. It is convenient to realize single loading and continuous repeated loading, which is conducive to the smooth development of the electromagnetic loading fatigue experiment.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH878

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