射流式调制声源的低频强声发射及其传播特性
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摘要
为研究射流式调制声源的发射和传播特性,文中搭建了多种室外声场声压测试平台,提出具有普适性的大功率气流扬声器声压级量测方法,测试射流式调制声源的低频发射特性和传播特性。实验结果表明:(1)声发射方面,在不同海拔高度的对比试验发现,高海拔(4 000 m)地区声压级较低海拔(70 m)地区声压级下降4 dB;(2)声传播方面,在号筒的作用下低频声波在号筒附近呈现出一定的指向性;声压级在传播方向上呈现指数函数衰减形式。本研究对射流式调制声源的低频强声发射能力的技术边界和低频声波在大气中的传播规律给出定量描述。
In order to study the emission and propagation characteristics of the fluidic air-modulated speaker,a variety of outdoor sound field and sound pressure test platforms was built and a universal sound pressure level measurement method for high-power airflow loudspeaker was proposed,and the low-frequency emission and propagation characteristics of the jet-modulated sound source was tested. The experiment result showed(1)In terms of acoustic emission,the comparative test at different altitudes found that the sound pressure level in the high altitude(4 000 m) region was 4 dB lower than that in the low altitude(70 m) region.(2)In terms of sound propagation,under the action of the drum,the low-frequency sound waves showed certain directivity near the drum. The sound pressure level attenuates exponentially in the direction of propagation. This paper describes quantitatively the technical boundary of the low-frequency strong acoustic emission capability and the propagation pattern of low-frequency sound waves in the atmosphere of the jet modulated sound source.
In order to study the emission and propagation characteristics of the fluidic air-modulated speaker,a variety of outdoor sound field and sound pressure test platforms was built and a universal sound pressure level measurement method for high-power airflow loudspeaker was proposed,and the low-frequency emission and propagation characteristics of the jet-modulated sound source was tested. The experiment result showed(1)In terms of acoustic emission,the comparative test at different altitudes found that the sound pressure level in the high altitude(4 000 m) region was 4 dB lower than that in the low altitude(70 m) region.(2)In terms of sound propagation,under the action of the drum,the low-frequency sound waves showed certain directivity near the drum. The sound pressure level attenuates exponentially in the direction of propagation. This paper describes quantitatively the technical boundary of the low-frequency strong acoustic emission capability and the propagation pattern of low-frequency sound waves in the atmosphere of the jet modulated sound source.
引文
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[16] 江涛.声波对水中球形粒子声辐射力的研究[D].西安:陕西师范大学,2018.
[17] 张扩基,马德录.便携式轻小气流扬声器[J].声学学报,1990(2):100-105.
[18] 周丽君,刘冬骏,马士阳.围蔽街道噪声传播规律分析[J].赤峰学院学报(自然科学版),2016,32(2):160-162.
[19] 刘芷彤.噪声扩散过程数值分析[J].中小企业管理与科技(下旬刊),2015(5):248-250.
[2] 刘克,马大猷.高声强—非线性声学续[J].物理通报,1995(7):3-6.
[3] 马大猷.高声强:Ⅰ基础[J].声学学报,1992(4):241-247.
[4] 侯双全,吴嘉,席葆树.低频声波对水雾消散作用的实验研究[J].流体力学实验与测量,2002(4):52-56.
[5] MEYER W A.Theoretical Analysis of the Performance of an Air、modulated Speaker[J].Journal of the Acoustical Society of America,1969,45(4):957-965.
[6] CHIRSTOPHER K W.TAM.Computational Aeroacoustics-an overview[J].Springer US,2018,13(1):1-5.
[7] 沈山豪.大功率气流扬声器综述[J].电声技术,1992(12):16-20.
[8] 白春华,严峰,王仲琦,等.调制气动声源声辐射特性实验研究[J].噪声与振动控制,2008(6):127-130.
[9] 杨亦春,滕鹏晓.气流扬声器全调制发声方法研究[J].声学学报,2010(2):192-199.
[10] 林丛,林彤,欧琳.有限面声源噪声的几何发散衰减的近似计算比较[J].化学工程与装备,2011(12):191-194.
[11] 娄方凤,杨兴周.高海拔气候对电机噪声频谱特性影响的研究[J].中小型电机,1993(2):36,38-40.
[12] 周鹤峰.变形调制气流声源的数值模拟研究[D].长沙:国防科学技术大学,2011.
[13] 席葆树.阻挡射流扬声器:中国,92102274.3[P].1992-09-09.
[14] GLENDINNING A G,NELSON P A,ELLIOTT S J.Experiments on a Compressed Air Loudspeaker[J].Journal of Sound & Vibration,1990,138(3):479-491.
[15] 全国声学标准化技术委员会.声学环境噪声的描述、测量与评价第2部分:环境噪声级测定:GB/T 3222.2—2009[S] .北京:中国标准出版社,2009.
[16] 江涛.声波对水中球形粒子声辐射力的研究[D].西安:陕西师范大学,2018.
[17] 张扩基,马德录.便携式轻小气流扬声器[J].声学学报,1990(2):100-105.
[18] 周丽君,刘冬骏,马士阳.围蔽街道噪声传播规律分析[J].赤峰学院学报(自然科学版),2016,32(2):160-162.
[19] 刘芷彤.噪声扩散过程数值分析[J].中小企业管理与科技(下旬刊),2015(5):248-250.