本文選題：電磁超聲 + 電磁力��； 參考：《電工技術(shù)學(xué)報》2016年16期

【摘要】：電磁超聲換能器的換能效率低是限制電磁超聲技術(shù)廣泛應(yīng)用的一個重要因素,如何提高換能器的換能效率一直都是電磁超聲領(lǐng)域的研究重點。激勵線圈作為激勵系統(tǒng)中十分重要的一部分,其激勵電流的大小決定試件表面產(chǎn)生電磁力的大小。但是,由于線圈和功率放大器之間存在嚴(yán)重的阻抗失調(diào),使其流過的電流及獲得的功率不是很理想。為此,根據(jù)電抗元件網(wǎng)絡(luò)可精確實現(xiàn)調(diào)諧和變阻的特性,結(jié)合二進(jìn)制的組合方式,設(shè)計了能夠匹配多種頻率線圈的電抗網(wǎng)絡(luò)。該網(wǎng)絡(luò)的接入可實現(xiàn)功率源和負(fù)載之間的最大功率傳遞,提高加載在線圈上的電流,為電磁超聲激勵提供較大的能量。仿真和實驗結(jié)果表明:該匹配網(wǎng)絡(luò)能在0.5~5MHz寬頻率范圍內(nèi)有效地提高電源的輸出效率,提升電磁加載的信噪比及轉(zhuǎn)換效率,為電磁超聲的后續(xù)研究奠定基礎(chǔ)。
[Abstract]:The low efficiency of electromagnetic ultrasonic transducer is an important factor limiting the wide application of electromagnetic ultrasonic technology. How to improve the efficiency of electromagnetic ultrasonic transducer has always been the focus of research in the field of electromagnetic ultrasound.The exciting coil is an important part of the excitation system. The magnitude of the exciting current determines the electromagnetic force produced on the surface of the specimen.However, due to the serious impedance misalignment between the coil and the power amplifier, the current flowing and the power obtained are not ideal.Therefore, according to the characteristic that reactance element network can accurately realize tuning and variable-resistance, combined with binary combination mode, the reactance network which can match various frequency coils is designed.The access of the network can realize the maximum power transfer between the power source and the load, increase the current on the loading loop, and provide a large amount of energy for the electromagnetic ultrasonic excitation.The simulation and experimental results show that the matching network can effectively improve the output efficiency of power supply in the wide frequency range of 0.5~5MHz, enhance the signal-to-noise ratio and conversion efficiency of electromagnetic loading, and lay a foundation for the further study of electromagnetic ultrasound.
【作者單位】： 河北工業(yè)大學(xué)電磁場與電器可靠性省部共建重點實驗室;天津工業(yè)大學(xué)電工電能新技術(shù)天津市重點實驗室;
【基金】：國家自然科學(xué)基金(51307043) 河北省自然科學(xué)基金(E2016202260) 天津市自然科學(xué)基金(16JCYBJC19000)資助項目
【分類號】：TB551
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本文編號：1731681