超声辐射杆振幅分布与空蚀区域  

Amplitude distribution and cavitation corrosion field of ultrasonic transducer system

作　　者：张敏[1] 李晓谦[1] 蒋日鹏[1] 郭程熙 

机构地区：[1]中南大学机电工程学院现代复杂装备设计与极端制造国家重点实验室,长沙410083

出　　处：《振动与冲击》2014年第13期59-62,共4页Journal of Vibration and Shock

基　　金：973计划项目(2010CB731706);973计划项目(2012CB619504)

摘　　要：利用激光测距仪对铸造用超声系统辐射杆进行振动测试,基于比值校正法对所测振动序列进行幅值谱校正后得到辐射杆端面与柱面的位移幅值分布。测试结果表明该超声系统振动以纵向振动为主,同时存在较强的纵横耦合振动。通过超声系统辐射杆空化腐蚀试验,发现辐射杆端面腐蚀均匀分布,柱面腐蚀则出现在振幅大于2.2μm的区域。结合柱面振幅分布与空化腐蚀区域推算出700°C时7050铝合金熔体的空化阈值约为1.1 MPa。Vibration test was done for a piezoelectric ultrasonic transducer used in casting by virtue of laser range finder.The displacement amplitude distribution of the end and cylindrical surface was gained through the amplitude spectrum correction of the vibration series based on interpolation method.The test results show that longitudinal vibration is the major vibration and there exists crossbar coupling in ultrasound system vibration.The results of the cavitation corrosion experiment of the radiator indicate that the corrosion on end surface is uniform but on cylindrical surface it occurs on the area where the amplitude is over 2.2μm.The calculation indicates that the cavitation threshold in aluminum alloy 7050 at temperature 700℃ is 1 .1 Mpa.

关 键 词：超声振动系统 振幅分布 空化腐蚀 空化阈值 

分 类 号：TG249.9[金属学及工艺—铸造] TB559[理学—物理]