The reason for the emergence of this phenomenon is that the frequency of incident microwave is getting close to the eigenfrequency of the cavity 這是因為此時腔體的本征頻率,近似等于入射波載頻,引起腔體的共振。
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 利用以上指標對試驗構(gòu)件的損傷進行識別與定位,研究結(jié)果表明,僅憑獲取的固有頻率不能準確判斷結(jié)構(gòu)構(gòu)件的損傷狀態(tài)及損傷位置,只能初步判斷結(jié)構(gòu)中是否出現(xiàn)損傷。
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 摘要本文對一類直線型駐波超聲電機振子的振動模態(tài)進行了系統(tǒng)的分析,討論了定子齒的位置、幾何尺寸對直線型超聲電機的固有頻率、振型的影響,為該類駐波型直線超聲電機的設(shè)計提供了理論依據(jù)。
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等軟件建立了圓盤定子的有限元模型,通過有限元分析的方法,討論了定子圓盤各個徑向尺寸參數(shù)對特征頻率的影響,不同壓電陶瓷厚度對定子特征頻率的影響,以及定子齒的齒高的變化對特征頻率的影響,為馬達結(jié)構(gòu)參數(shù)的優(yōu)化設(shè)計提供了依據(jù)。