ABSTRACT

In this article, a two-objective procedure is proposed to optimize the topology of wide horns. These two objectives are: the longitudinal natural frequency of the horn should be similar to the frequency of the driven transducer–booster, and the output face of the horn should vibrate uniformly. The weighted sum method is used to calculate the two-objective sensitivity number. Based on the proposed algorithm, three horns (bar, cylindrical and U-shaped bar) are designed. For these horns, optimum designs are obtained, the amplitude uniformities of which are improved by 67%, 19.5% and 584.5%, respectively, compared with the initial models. Also, the resonance frequencies of the bar and U-shaped bar horns are 0.25%, and 0.75% less than the target frequency and the resonance frequency of the cylindrical horn is 0.2% higher than the target frequency. To verify the results of the proposed algorithm, a well-designed bar horn is fabricated and tested. In the experimental results, the resonance frequency and uniformity of the horn are, respectively, 0.4% higher and 0.97% lower than the simulation results.

摘要

在本文中，提出了一种两目标程序来优化宽喇叭的拓扑。这两个目标是：喇叭的纵向固有频率应与驱动换能器-助推器的频率相似，并且喇叭的输出面应均匀振动。加权和法用于计算二目标灵敏度数。基于所提出的算法，设计了三个喇叭（杆、圆柱形和 U 形杆）。对于这些喇叭，获得了优化设计，与初始模型相比，其振幅均匀性分别提高了67%、19.5%和584.5%。此外，棒状和U形棒状喇叭的共振频率比目标频率低0.25%和0.75%，圆柱喇叭的共振频率比目标频率高0.2%。为了验证所提出算法的结果，制作并测试了一个精心设计的条形喇叭。在实验结果中，喇叭的共振频率和均匀度分别比仿真结果高0.4%和低0.97%。