| 杨洋,桑永杰,刘茂伊,蓝宇.电动式换能器声源级起伏改善实验研究[J].,2023,42(1):100-106 |
| 电动式换能器声源级起伏改善实验研究 |
| Experimental research on improving source level fluctuation of moving coil projector |
| 投稿时间：2021-11-06 修订日期：2022-11-28 |
| 中文摘要: |
| 电动式声源由于存在内部声腔，导致辐射面上的负载在频域上出现极值，使得电动式声源的声源级响应出现起伏，给电动式声源在宽带噪声模拟领域的应用带来了挑战。依据电动式声源含有声腔的等效电路分析结果，针对无声腔、有声腔、在声腔底部设置吸声棉和在声腔内充入氦气四种情况，使用加速度计测试了辐射面的输出振速，并归算出声源级曲线并加以比较。实验结果验证了声腔谐振是导致电动式声源频响曲线出现起伏的原因；在声腔内充入特性阻抗小的气体可有效地将声腔的谐振频率调节至工作频段以外，从而实现电动式声源在质量控制区平坦的响应输出。 |
| 英文摘要: |
| Due to the acoustic cavity in moving coil projector, the load on the radiation surface have extreme values in the frequency domain, which makes the source level response of the projector fluctuate. It is harmful to the application of the projector in the field of broadband noise simulation. Base on the analysis result of the equivalent circuit of moving coil projector containing the acoustic cavity, experimental research is carried out in this paper. The output vibration velocity on the radiation surface was tested with the accelerometer for the four cases：without acoustic cavity, with acoustic cavity, setting sound-absorbing cotton at the bottom of the acoustic cavity, and filling helium gas in the acoustic cavity. Then the source level curves for the four cases are calculated and compared. The experimental results verify that the resonance of the acoustic cavity is the cause of source level fluctuations; filling low characteristic impedance gas in the acoustic cavity can effectively improve the fluctuation of the source level in the quality control area. |
| DOI：10.11684/j.issn.1000-310X.2023.01.013 |
| 中文关键词: 电动式换能器 声腔 声源级 氦气 测试 |
| 英文关键词: moving coil projector acoustic cavity source level helium gas test |
| 基金项目: |
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