【摘要】：為實現(xiàn)對超磁致伸縮超聲換能器輸出振幅的準(zhǔn)確預(yù)測,由換能器的等效電路推導(dǎo)得到輸出振幅模型,并通過阻抗分析辨識出模型中的等效參數(shù)。為提高模型的準(zhǔn)確性,研究了激勵信號的頻率和電壓幅值對機電轉(zhuǎn)換系數(shù)的影響。通過實驗建立機電轉(zhuǎn)換系數(shù)與激勵頻率的關(guān)系曲線,插值得到不同頻率激勵下?lián)Q能器的機電轉(zhuǎn)換系數(shù),由振幅模型得到換能器輸出振幅與激勵電流幅值的關(guān)系曲線。結(jié)果表明:基于阻抗分析結(jié)果建立的振幅模型能夠較準(zhǔn)確地預(yù)測換能器在諧振狀態(tài)下的輸出振幅,驗證了振幅模型的正確性�；诓逯捣ǖ玫降恼穹�-電流幅值曲線與實驗結(jié)果一致,驗證了所建立的機電轉(zhuǎn)換系數(shù)與激勵頻率之間關(guān)系的正確性,提高了振幅模型在不同頻率下的準(zhǔn)確性。
[Abstract]:In order to accurately predict the output amplitude of the giant magnetostrictive ultrasonic transducer, the output amplitude model is derived from the equivalent circuit of the transducer, and the equivalent parameters in the model are identified by impedance analysis. In order to improve the accuracy of the model, the influence of the frequency and voltage amplitude of the excitation signal on the electromechanical conversion coefficient is studied. The relationship curve between the electromechanical conversion coefficient and the excitation frequency is established by experiments. The electromechanical conversion coefficient of the transducer under different frequency excitation is obtained by interpolation. The relation curve between the output amplitude of the transducer and the amplitude of the exciting current is obtained from the amplitude model. The results show that the amplitude model based on the impedance analysis can accurately predict the output amplitude of the transducer in the resonant state and verify the correctness of the amplitude model. The amplitude-current amplitude curve obtained by the interpolation method is consistent with the experimental results, which verifies the correctness of the relationship between the electromechanical conversion coefficient and the excitation frequency, and improves the accuracy of the amplitude model at different frequencies.
【作者單位】： 清華大學(xué)機械工程系精密超精密制造裝備及控制北京市重點實驗室;
【基金】：國家自然科學(xué)基金項目(51475260) 北京市自然科學(xué)基金項目(3141001)
【分類號】：TG663
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本文編號：2235989