中文摘要：

针对聚合物超声塑化过程中的超声声场分布问题,采用仿真与实验相结合的方法进行研究。基于多元高斯声束叠加理论,仿真研究聚合物超声塑化过程中的声场分布。通过自行设计制造的聚合物超声塑化检测装置,研究塑化过程中聚合物轴线处的声压分布规律。研究结果表明：实际超声声压在离工具头距离约1.5 mm处作用最强,约达1.8 MPa,其后随距离的增大而逐渐递减;在近场区,实际声压幅值不存在仿真中剧烈波动的情形,声压幅值相对稳定,在远场区,实际声压幅值接近仿真值;固态聚合物所受超声声压较大,聚合物熔融后,声压幅值降低,实际声压因受反射、透射以及衰减的影响小于仿真值。

英文摘要：

The simulation and experiment research was conducted aiming at the problem of ultrasonic acoustic field distribution in polymer ultrasonic plasticizing process. The ultrasonic acoustic field in plasticization process was simulated based on the superposition of Gaussian beams theory. And the acoustic field distribution discipline of polymer was studied by self-designed polymer ultrasonic plasticization device. The results show that the actual ultrasonic acoustic pressure of polymer reaches approximately the maximum value of 1.8 MPa at the distance of approximately 1.5 mm. And the value decreases with the increase of distance. Compared to the simulation, the actual ultrasonic sound pressure has less fluctuant but stable in near field region. However, the pressure in far field region has ideal coincidence between experiment and simulation results. The solidified polymer is subjected by higher ultrasonic sound pressure than melted polymer. The actual pressure is lower than the simulated value due to the existence of reflection, penetration, attenuation in sound pressure and friction between granules.