几种扭振复合超声变幅杆的研究

Study on the composite torsional transfomers

对左、右段为圆柱型、中间段为变截面杆的三段式复合扭振超声变幅杆给出了频率方程和参数计算通式据此得出中间段l2分别为指数型、类国雄型、类悬镇线型和类余弦型，而l1=l3≠0，或l1≠0；或l3≠0的各种组合复合杆的参数计算式，并算出了其参数值，给出了主要参数曲线．测试了十组典型试件的谐振频率和放大系数，实验结果与理论值基本一致。

The general frequency equations and parameter formulae for three sectiontorsional composite ultrasonic trasfomers of which the left and right sections are uniformcylinders while the middle one is taper are introduced. The middle section l2 may beexponential, similar-conical, similar-catenary or similar-cosine taper and the lengths ofthe left and right cylinders l1 and l3 may be l1 = l3 ≠ 0, l1 ≠ 0 or l3 ≠ 0. Accordingto that, the parameters of dimensions and characteristics of these 12 classes of composite horns are calculated, and theoretical curves of the chief parameters are given. Theresonant frequencies and amplification factors of ten typical horn specimens have beenexperimentally measured. The experimental results basically agree with the theoreticalvalues. A great member of horns suitable for various concrete usages can be composedby this way.