基于非定常机电转换系数的超磁致伸缩换能器输出振幅模型
发布时间：2018-09-11 07:16
【摘要】：为实现对超磁致伸缩超声换能器输出振幅的准确预测,由换能器的等效电路推导得到输出振幅模型,并通过阻抗分析辨识出模型中的等效参数。为提高模型的准确性,研究了激励信号的频率和电压幅值对机电转换系数的影响。通过实验建立机电转换系数与激励频率的关系曲线,插值得到不同频率激励下换能器的机电转换系数,由振幅模型得到换能器输出振幅与激励电流幅值的关系曲线。结果表明:基于阻抗分析结果建立的振幅模型能够较准确地预测换能器在谐振状态下的输出振幅,验证了振幅模型的正确性。基于插值法得到的振幅-电流幅值曲线与实验结果一致,验证了所建立的机电转换系数与激励频率之间关系的正确性,提高了振幅模型在不同频率下的准确性。
[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.
【作者单位】： 清华大学机械工程系精密超精密制造装备及控制北京市重点实验室;
【基金】：国家自然科学基金项目(51475260) 北京市自然科学基金项目(3141001)
【分类号】：TG663
，
本文编号：2235989
[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.
【作者单位】： 清华大学机械工程系精密超精密制造装备及控制北京市重点实验室;
【基金】：国家自然科学基金项目(51475260) 北京市自然科学基金项目(3141001)
【分类号】：TG663
，
本文编号：2235989
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