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中文摘要：
针对杆截面的突变会降低振动波传输效率的问题，提出基于连续变截面兰杰文振子的设计方法。讨论杆截面的突变对振动波传播的影响，研究连续变截面杆的振动放大系数和功率流特性，并给出连续变截面杆的轮廓函数。最后设计了具有连续变截面振子的直线电机，该电机最大推力为21．4N，最大速度为235mm／s，推重比为25（驱动电压峰峰值为300V）。试验研究了电机的速度一频率、速度一相位差、速度一电压之间的规律，结果表明该电机具有良好的输出特性。
英文摘要：
Since the transmission efficiency of vibration wave decreased in a bar with sudden variable cross-sections, a new design method based on continuous variable cross-section for Langevin vibrators was proposed. The relationship between the cross-section shape of the bar and transmission efficiency of longitudinal wave was discussed. The longitudinal vibration of bars with continuous variable cross-section was derived as well as its profile function. Meanwhile its acoustic characteristics were also discussed. An improved linear motor was designed by using the Langevin vibrators with continuous variable cross-section. Its maximum thrust increases to 21.4 N, the maximum speed is up to 235 mm/s, and thrust weight ratio is 25 when the peak-to-peak value of driving voltage is 300 V. The speed-frequency relation, the speed-phase difference relation, speed-voltage relation of the motor were obtained by testing. The experimental results indicate that the motor has better output performance.
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