超磁致伸缩超声振子预紧特性对输出振幅的影响规律

In order to develop a high - stability high - power rotary ultrasonic machining system, the influence law of the pre - tightening characteristics of the ultrasonic transducer on the output amplitude is studied by using the giant magnetostrictive material. Based on the analogy principle of the electromechanical equivalent circuit, an equivalent circuit model of the ultrasonic transducer is established, and an amplitude output model of the giant magnetostrictive ultrasonic transducer is derived. Through impedance analysis, the parameters of the equivalent stiffness, equivalent damping and electromechanical conversion coefficient of the system are identified. It is proposed to characterize the amplitude characteristics of the system with the actual energy conversion efficiency, and the influence laws of the prestress of the ultrasonic transducer and the pre - tightening torque of the horn on the system are studied. The research results show that the amplitude characteristics of the ultrasonic transducer are affected by the prestress of the ultrasonic transducer and the pre - tightening torque of the horn. Therefore, factors such as the strength and amplitude stability of the pre - tightening mechanism need to be comprehensively considered, and the parameters of the pre - tightening mechanism should be optimized and designed within the effective frequency tracking accuracy range to improve the ultrasonic amplitude characteristics.

为了开发出高稳定性的大功率旋转超声加工系统,采用超磁致伸缩材料研究超声振子预紧特性对输出振幅的影响规律。基于机电等效电路类比原理,建立了超声振子等效电路模型,推导出超磁致伸缩超声振子的振幅输出模型。通过阻抗分析对系统等效刚度、等效阻尼以及机电转换系数进行参数辨识,提出以实际能量转换效率表征系统振幅特性,研究了超声换能器预应力和变幅杆预紧扭矩对系统的影响规律。研究结果表明,超声振子的振幅特性受到超声换能器预应力和变幅杆预紧扭矩的影响,因此,需综合考虑预紧机构的强度和振幅稳定性等因素,在有效的频率跟踪精度范围内优化设计预紧机构参数,改善超声振幅特性。