Structural Dynamic Analysis for the Natural Frequency of the Horn and Workpiece Combination
In order to find the vibration frequency when the workpiece obtains optimum vibration effect, the structural dynamic analysis were conducted in this paper, using finite element dynamic analysis methods on the horn and the workpiece combination. Through the vibration mode analysis, the resonant frequency of the horn and workpiece combination along the workpiece axial direction (y) is 20.845KHZ, along the x, z direction are respectively 22.373KHZ and 22.375KHZ, which are in the range of the ultrasonic generator frequency adjustment. Through the harmonic response analysis, the displacement amplitude in the big end of the horn is substantially equal, the displacement of each node on the symmetry axis of the horn increases firstly and then decreases along the axial, reaching the minimum at the wave node, and then gradually increases, reaching the maximum on the free end. The magnification is up to 18.84um, which can meet the requirements of ultrasonic vibration. In addition, it can be seen from the model graph of the workpiece thin segment that in the ultrasonic loading conditions, the thin segment of the workpiece at the middle position are mostly easy to break, which is consistent with the theoretical analysis. These findings and follow-up of test results are consistent, which proved the validity and reliability of software analysis.
Guanglin Wang, Huifeng Wang, Xiang Zhang, Bin Li, Dingfang Chen and Yuefeng Li
X. L. Cheng et al., "Structural Dynamic Analysis for the Natural Frequency of the Horn and Workpiece Combination", Key Engineering Materials, Vol. 522, pp. 293-296, 2012