摘要
为了有效改善二维工具头辐射面振幅分布不均匀的问题,对二维超声塑料焊接系统进行了优化设计研究:首先,利用横向位错在大尺寸长条形工具头上构造近周期声子晶体同质位错结,调节带隙的宽度和位置,使得二维超声塑料焊接系统的工作频率位于工具头的横向振动的带隙内,进而有效地控制工具头X方向的横向振动;其次,利用近周期声子晶体斜槽结构进一步优化辐射面的振幅分布均匀度,并分析了斜槽结构参数对超声塑料焊接系统纵向共振频率和振幅分布均匀度的影响规律.模拟仿真结果表明,近周期声子晶体同质位错结和斜槽结构能够实现对二维超声塑料焊接系统的优化,为横向振动抑制理论的进一步研究提供了基础.
When the lateral dimension of the tool head is close to or greater than a quarter of the longitudinal wave length,the tool head will produce severe lateral vibration.The coupling of the lateral vibration and the longitudinal vibration makes the amplitude distribution of the tool head’s radiation surface uneven,which seriously affects the welding quality.To solve the problem of uneven amplitude distribution of the twodimensional tool head’s radiating surface,in the paper we conduct an optimized design study on a twodimensional ultrasonic plastic welding system.First,using the theory of phononic crystal dislocations,we construct a nearly periodic phononic crystal homogenous dislocation junction on a large-sized long strip tool head,and use the homogenous dislocation junction to change the regular lattice arrangement of the phononic crystal structure to adjust the position of the band gap and increase the width of the band gap,so that the operating frequency of the two-dimensional ultrasonic plastic welding system can be located in the band gap of the lateral vibration of the tool head,and the effective control of the lateral coupling vibration of the tool head can be achieved,thus optimizing the amplitude uniformity of the radiating surface of the tool head and increasing the amplitude gain.Although the homogenous dislocation junction structure improves the amplitude uniformity of the radiating surface of the tool head,the lateral dislocation effect of the homogenous dislocation junction causes the sound waves in the band gap frequency range to propagate along the dislocation channel,while the dislocation line channel is located in the middle of the tool head,which results in a larger displacement of the middle part of the tool head’s radiating surface,and a smaller displacement on both sides.Therefore,the further optimizing of the two-dimensional tool head is required.In this study,the nearly periodic phononic crystal inclined groove structure is used to better optimize the amplitude distribution uniformity
作者
林基艳
林书玉
Lin Ji-Yan;Lin Shu-Yu(Shaanxi Key Laboratory of Ultrasonics,Shaanxi Normal University,Xi’an 710119,China;School of Information Engineering,Yulin University,Yulin 719000,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第18期228-238,共11页
Acta Physica Sinica
基金
国家自然科学基金(批准号:11674206,11874253,11964040)资助的课题.
关键词
近周期声子晶体
同质位错结
斜槽结构
振幅分布均匀性
near-period phononic crystal
homogeneous dislocation junction
inclined groove structure
amplitude distribution uniformity
