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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6~10 Hz,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。
Ultrasonic power supplies using three different frequency tracking principles drive the same ultrasonic vibration system for no-load testing and casting tests. By measuring the output amplitude of the vibrating system and analyzing the solidified microstructure of the ingot, the influence of the ultrasonic power frequency with the frequency precision is studied. The results show that under the same conditions, the ultrasonic power with fuzzy control method and PID method combined control has the highest follow-frequency accuracy up to 6 ~ 10 Hz, without interference and good stability. Under the excitation of the ultrasonic vibration system, Load output amplitude of 16.5μm, about 1.5 to 2.5 times the power of the other two, used in casting ingot refinement obtained the best results, the average grain size of 135μm.