一种改进的低信噪比流道线性阻抗消除算法

IF 1.2 4区工程技术 Q3 ACOUSTICS

International Journal of Aeroacoustics Pub Date : 2022-04-21 DOI:10.1177/1475472X221093710

Penglin Zhang, Cheng Yang, Yu Huang

{"title":"一种改进的低信噪比流道线性阻抗消除算法","authors":"Penglin Zhang, Cheng Yang, Yu Huang","doi":"10.1177/1475472X221093710","DOIUrl":null,"url":null,"abstract":"The impedance eduction technique is widely used by the aeroacoustics community to obtain liner property in a flow duct. However, the obtained impedance is often found to be discontinuous in the frequency domain which violates theoretical liner models. The low signal-to-noise ratio (SNR, in dB) is one factor leading to this unexpected result. To overcome this, a weighting coefficient, represented by an SNR dependent sigmoid function with two control parameters, is introduced to the cost function in the iteration process. The proposed algorithm is employed to measure the impedances of two liners and results show an improvement in the smoothness of the resultant impedance curves over those obtained from conventional cost function.","PeriodicalId":49304,"journal":{"name":"International Journal of Aeroacoustics","volume":null,"pages":null},"PeriodicalIF":1.2000,"publicationDate":"2022-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"An improved algorithm for liner impedance eduction in low signal-to-noise ratio flow duct\",\"authors\":\"Penglin Zhang, Cheng Yang, Yu Huang\",\"doi\":\"10.1177/1475472X221093710\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The impedance eduction technique is widely used by the aeroacoustics community to obtain liner property in a flow duct. However, the obtained impedance is often found to be discontinuous in the frequency domain which violates theoretical liner models. The low signal-to-noise ratio (SNR, in dB) is one factor leading to this unexpected result. To overcome this, a weighting coefficient, represented by an SNR dependent sigmoid function with two control parameters, is introduced to the cost function in the iteration process. The proposed algorithm is employed to measure the impedances of two liners and results show an improvement in the smoothness of the resultant impedance curves over those obtained from conventional cost function.\",\"PeriodicalId\":49304,\"journal\":{\"name\":\"International Journal of Aeroacoustics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.2000,\"publicationDate\":\"2022-04-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Aeroacoustics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1177/1475472X221093710\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ACOUSTICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Aeroacoustics","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1177/1475472X221093710","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ACOUSTICS","Score":null,"Total":0}

引用次数: 0

摘要

阻抗消减技术是气动声学学界广泛采用的一种获得管道内线性特性的方法。然而，得到的阻抗在频域中往往是不连续的，这违背了理论线性模型。低信噪比(SNR，以dB为单位)是导致这一意想不到的结果的一个因素。为了克服这个问题，在迭代过程中，在代价函数中引入一个加权系数，该加权系数由信噪比相关的具有两个控制参数的sigmoid函数表示。将该算法用于测量两个衬垫的阻抗，结果表明所得阻抗曲线的平滑度比传统成本函数得到的阻抗曲线有所提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

An improved algorithm for liner impedance eduction in low signal-to-noise ratio flow duct

The impedance eduction technique is widely used by the aeroacoustics community to obtain liner property in a flow duct. However, the obtained impedance is often found to be discontinuous in the frequency domain which violates theoretical liner models. The low signal-to-noise ratio (SNR, in dB) is one factor leading to this unexpected result. To overcome this, a weighting coefficient, represented by an SNR dependent sigmoid function with two control parameters, is introduced to the cost function in the iteration process. The proposed algorithm is employed to measure the impedances of two liners and results show an improvement in the smoothness of the resultant impedance curves over those obtained from conventional cost function.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

International Journal of Aeroacoustics ACOUSTICS-ENGINEERING, AEROSPACE

CiteScore

2.10

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： International Journal of Aeroacoustics is a peer-reviewed journal publishing developments in all areas of fundamental and applied aeroacoustics. Fundamental topics include advances in understanding aeroacoustics phenomena; applied topics include all aspects of civil and military aircraft, automobile and high speed train aeroacoustics, and the impact of acoustics on structures. As well as original contributions, state of the art reviews and surveys will be published. Subtopics include, among others, jet mixing noise; screech tones; broadband shock associated noise and methods for suppression; the near-ground acoustic environment of Short Take-Off and Vertical Landing (STOVL) aircraft; weapons bay aeroacoustics, cavity acoustics, closed-loop feedback control of aeroacoustic phenomena; computational aeroacoustics including high fidelity numerical simulations, and analytical acoustics.