The reason for the emergence of this phenomenon is that the frequency of incident microwave is getting close to the eigenfrequency of the cavity 这是因为此时腔体的本征频率,近似等于入射波载频,引起腔体的共振。
2.
I turns out to be that the position and degree of damage can not be well detected only by eigenfrequency , while only can detect if the damage has appeared . however , severe damage can be diagnosed if the modal shape and natural period are used 利用以上指标对试验构件的损伤进行识别与定位,研究结果表明,仅凭获取的固有频率不能准确判断结构构件的损伤状态及损伤位置,只能初步判断结构中是否出现损伤。
3.
The influences of stator ' s teeth on vibrating modal of the linear standing wave usm are discussed in this paper , in which eigenfrequency and wave - shape are analyzed while the position and geometry dimension of stator ' s teeth are changed , and it can give some advice on design for standing wave linear ultrasonic motor 摘要本文对一类直线型驻波超声电机振子的振动模态进行了系统的分析，讨论了定子齿的位置、几何尺寸对直线型超声电机的固有频率、振型的影响，为该类驻波型直线超声电机的设计提供了理论依据。
4.
Using pro / e ansys fem software , based on results of analyzing fem model , the article discuss the influence to the eigenfrequency of the stator in different dimension parameters of the stator loop , different pzt thickness , the influence of tooth height along circumferential direction on eigenfrequency is analyzed . it offers a foundation for optimum design the structure of the stator . fem equivalent circuit model of the ultrasonic motor has been built 利用pro / e 、 ansys等软件建立了圆盘定子的有限元模型,通过有限元分析的方法,讨论了定子圆盘各个径向尺寸参数对特征频率的影响,不同压电陶瓷厚度对定子特征频率的影响,以及定子齿的齿高的变化对特征频率的影响,为马达结构参数的优化设计提供了依据。
