摘要
使用三种不同频率跟踪原理的超声波电源驱动同一超声振动系统进行空载测试及铸造试验。通过测量振动系统的输出振幅及分析铸锭的凝固组织特征，研究超声波电源跟频精度对二者的影响规律。结果表明：在相同条件下，采用模糊控制法与PID法组合控制的超声波电源跟频精度最高，可达6～10Hz，且不受干扰、稳定性好，超声振动系统在其激励下，空载输出振幅为16．5μm，约为其它两种电源的1．5-2．5倍，用于铸造时获得的铸锭组织细化效果也最好，平均晶粒尺寸达到135μm。
The same set of ultrasonic vibration system was driven by three ultrasonic generators with different kinds of frequency tracking theory to perform no-load tests of amplitude and casting experiments. By measuring output amplitudes of the ultrasonic vibration system and analyzing the microstructure of the casting ingots, the effects of frequency tracking accuracy on the two variables mentioned above were studied. The results show that under the same condition, the ultrasonic generator controlled by fuzzy control and PID together has highest frequency tracking accuracy （6Hz to10kHz） and a good stability. When the ultrasonic vibration system is driven by this generator, its output amplitude can reach 16.5 μm in the no-load testing, which is about 1.5 to 2.5 times to that driven by the other two kinds of ultrasonic generators. The microstructure of the casting ingots has the best effect of grain refinement with an average grain size of 135 μm.
出处
《热加工工艺》
CSCD
北大核心
2014年第13期86-89,共4页
Hot Working Technology
基金
国家重点基础研究发展规划(973计划)项目(2012-CB619504)
关键词
铝合金
超声波电源
频率跟踪
振幅
微观组织
aluminum alloy
ultrasonic generator
frequency tracking
amplitude
microstructure
