中文摘要：

超声振动系统传统的设计方法普遍存在计算量大且精度不高的缺陷。在设计过程中引用有限元分析软件ANSYS Workbench对换能器、变幅杆和工具头等进行静力、模态、谐响应的模拟分析,得出了各部分最大、最小的位移和应力值出现的部位以及谐振频率的大小,对不合理的设计尺寸进行优化和修正。最终确定了换能器的尺寸和预紧力大小,变幅杆放大系数为2.36,阻抗为8Ω;工具头放大系数为1.27,端面最大振幅为5.5μm。将设计的超声振动系统应用到超声辅助振动拉伸、压缩试验中,当载荷为10 kN时,振幅为5.4μm,仅衰减1.8%。

英文摘要：

Many disadvantages such as large computing and low precision existed in the traditional design method of ultrasonic vibration system. It was analyzed static force,modal and harmonic response of the energy transduced,amplitude transformer and tool head by the finite element simulation software ANSYS Workbench. The positions of both the minimum and the maximum displacements and stresses and the values of frequency were obtained,and the irrational dimensions were revised and optimized. Finally,the size of the energy transducer and prestressing force were determined. The amplification coefficient of amplitude transformer is 2. 36,and the impedance of amplitude transformer is 8 Ω. The amplification coefficient of the tool head is 1. 27,and the maximum amplitude of end face of tool head is5. 5 μm. The designed ultrasonic vibration system is applied in the ultrasonic tensile and compression tests,and when the loading is10 kN,the amplitude is 5. 4 μm,which drops by 1. 8% only.