本文選題：電磁加載　切入點(diǎn)：脈沖激勵(lì)源　出處：《河北工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：對(duì)金屬結(jié)構(gòu)進(jìn)行電磁加載,會(huì)在裂紋處產(chǎn)生應(yīng)力波信號(hào),利用該現(xiàn)象可以實(shí)現(xiàn)對(duì)金屬缺陷的無(wú)損檢測(cè)。脈沖激勵(lì)源作為電磁加載裝置的核心部件,其輸出電流的幅值、頻率等參數(shù)對(duì)電磁加載效果的影響顯而易見。針對(duì)電磁加載的實(shí)驗(yàn)要求,確定了脈沖激勵(lì)源的設(shè)計(jì)要求:脈沖輸出頻率在低頻范圍內(nèi)連續(xù)可調(diào),峰值電流在1200A以內(nèi)可調(diào),脈沖寬度為10~50?s之間。首先,本課題基于半橋型開關(guān)電路原理,采用恒頻脈寬調(diào)制的控制方式,設(shè)計(jì)了以MOSFET為核心的可調(diào)穩(wěn)壓電源。其次,采用聚丙烯電容器作為儲(chǔ)能電容,以MTC500-16為主開關(guān)器件構(gòu)建了電容充放電回路,并采用STC89C52單片機(jī)系統(tǒng)實(shí)現(xiàn)了主回路的頻率調(diào)節(jié)、顯示與驅(qū)動(dòng)信號(hào)輸出。最后,對(duì)脈沖激勵(lì)電源進(jìn)行聯(lián)合調(diào)試,其輸出結(jié)果達(dá)到了設(shè)計(jì)要求。該電源可分別工作于直流可調(diào)穩(wěn)壓電源和脈沖激勵(lì)源兩種模式。作為穩(wěn)壓電源,其可實(shí)現(xiàn)0~300V之間連續(xù)可調(diào)。作為脈沖激勵(lì)源時(shí),最大輸出峰值電流可達(dá)1500A,應(yīng)用于電磁加載實(shí)驗(yàn)中,可以方便地實(shí)現(xiàn)單次加載和連續(xù)多次重復(fù)加載,有利于電磁加載疲勞實(shí)驗(yàn)的順利開展。
[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.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH878

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 馬濤;高頻斬波串級(jí)調(diào)速系統(tǒng)保護(hù)電路研究[D];華北電力大學(xué);2012年

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本文編號(hào)：1586939