INTER-NOISE and NOISE-CON Congress and Conference Proceedings最新文献_第4页

Exploring the potential of recycled polypropylene-waste jute fiber composites for sound insulation: An experimental and theoretical analysis 探索回收聚丙烯-废黄麻纤维复合材料的隔音潜力：实验和理论分析

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0101

J. Mago, Sunali Jaish, Ashutosh Negi, J. S. Bolton, S. Fatim

{"title":"Exploring the potential of recycled polypropylene-waste jute fiber composites for sound insulation: An experimental and theoretical analysis","authors":"J. Mago, Sunali Jaish, Ashutosh Negi, J. S. Bolton, S. Fatim","doi":"10.3397/nc_2024_0101","DOIUrl":"https://doi.org/10.3397/nc_2024_0101","url":null,"abstract":"This study explores the potential of panels made from Recycled Polypropylene (RPP) and Waste Jute Fiber (WJF) for sound insulation applications. Two types of panels were fabricated by the compression molding process: Neat RPP and a composite of RPP reinforced with a WJF interlayer (RPP/WJF/RPP).\u0000 The physical properties, namely density and mechanical properties, such as tensile strength and modulus, were examined for both panels. The vibration properties of the panels were evaluated through a modal analysis conducted according to ASTM E756-05 guidelines, while sound insulation was\u0000 assessed by measuring normal incidence sound transmission loss (STL) using a four-microphone impedance-tube setup following ASTM E2611-19 standards. The RPP/WJF/RPP composite, with a density of 913 kg/m³, is 2.47% higher than that of Neat RPP, which is 891 kg/m³, and exhibited an\u0000 increased tensile strength of 12.01 MPa, compared to 10.03 MPa for Neat RPP. In the second vibration mode, the composite's damping ratio of 3.62% outperformed Neat RPP's 2.48%. Furthermore, the composite's measured average STL was 38.6 dB, exceeding the Neat RPP's average of 37.7 dB. This\u0000 enhancement in STL is likely attributed to the composite's higher surface density (5.21 kg/m²) relative to Neat RPP (4.72 kg/m²), contributing to its improved sound insulation properties. The theoretical average STL values, predicted using the Mass","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

It's only one more data center! When scope creep becomes sound emissions creep 只是多了一个数据中心而已！当范围蠕变变成声排放蠕变

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0027

Michael Conaway, John Baldassano

引用次数: 0

Trends and relationships between airport operations and noise complaints in Maryland between 2016 and 2023 2016 年至 2023 年马里兰州机场运营与噪声投诉之间的趋势和关系

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0085

Pelumi Abiodun, A. Olude, O. Owolabi, Cornelius Darko

{"title":"Trends and relationships between airport operations and noise complaints in Maryland between 2016 and 2023","authors":"Pelumi Abiodun, A. Olude, O. Owolabi, Cornelius Darko","doi":"10.3397/nc_2024_0085","DOIUrl":"https://doi.org/10.3397/nc_2024_0085","url":null,"abstract":"The noise pollution from aircraft near airports significantly affects the health and quality of life of the local community either near or far away. This study analyzes trends in airport noise complaints in Maryland from 2016-2018. Data on noise complaints were extracted from airport\u0000 noise quarterly reports and the data included the number of complaints and unique complaints from different communities near airports, as well as average aircraft operations. The number of complaints rose from less than 1,000 in 2016 to nearly 10,000 in 2018. This study aims to identify the\u0000 communities most impacted by increasing airport noise through descriptive and geospatial analysis of complaint data. Results will highlight high-complaint areas to inform future noise mitigation policies and airport expansions in Maryland. The number of noise complaints increased drastically\u0000 from 2016-2018, while flight operations remained steady. Correlational analyses examine the strength of relationship between flight volume and complaint volume over time. Boeing 737-700 operations has the most significant relationship with the number of unique complainants around Baltimore/Washington\u0000 International Airport. Results will help inform policies to mitigate noise impacts by identifying whether reducing operations, changing flight paths, or other strategies could effectively reduce complaints as well as help the meeting the noise reduction design goals of the state.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 41","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Times to stabilize sound metrics in rural areas - How long should you monitor? 农村地区声学指标的稳定时间--应监测多久？

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0178

Kenneth Kaliski, D. K. Wilson

引用次数: 0

Test method for evaluating the NIOSH Noise Mapper application in a hemi-anechoic chamber 在半消声室中评估 NIOSH 噪音绘图仪应用的测试方法

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0029

Lincan Yan, Yousef Elmashae, Jonathan Hrica, D. Yantek

{"title":"Test method for evaluating the NIOSH Noise Mapper application in a hemi-anechoic chamber","authors":"Lincan Yan, Yousef Elmashae, Jonathan Hrica, D. Yantek","doi":"10.3397/nc_2024_0029","DOIUrl":"https://doi.org/10.3397/nc_2024_0029","url":null,"abstract":"The Noise Mapper Application developed by the National Institute for Occupational Safety and Health (NIOSH) can be used to identify areas in the workplace where workers may be exposed to hazardous noise. The app was created to empower workers to measure sound levels in their workplace,\u0000 make informed decisions about noise exposure, and prevent occupational hearing loss. To evaluate the maps generated by the app, a single sound source or multiple sources were used to generate steady state sound fields within the NIOSH hemi-anechoic chamber (HAC). A sound level meter (Larson\u0000 Davis, Model 831C) was used to measure A-weighed equivalent continuous sound levels on a grid with a spacing of 1.5 m (5 ft). The NIOSH Noise Mapper app was then used to generate sound level contour plots with a grid spacing of 3.0 m (10 ft). The accuracy of the map was evaluated by comparing\u0000 the predicted sound levels with the measured sound levels. The results show the app can estimate the sound levels to within ±1.2 dB(A) of the measured values. The test method used to evaluate the NIOSH Noise Mapper app and the results of the comparison will be discussed in this paper.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PARTNER project 1, low-frequency noise, and FAA's noise policy review PARTNER 项目 1、低频噪音和 FAA 噪音政策审查

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0070

Victor Sparrow

{"title":"PARTNER project 1, low-frequency noise, and FAA's noise policy review","authors":"Victor Sparrow","doi":"10.3397/nc_2024_0070","DOIUrl":"https://doi.org/10.3397/nc_2024_0070","url":null,"abstract":"To improve upon current FAA noise policy, it seems reasonable to consider supplemental metrics. One of these is to include the annoyance impacts of low-frequency noise (LFN). It is established that LFN can cause rattle in homes near airports, causing annoyance. Current DNL 65 does not\u0000 address LFN. In fact, most acoustical measurements do not include low frequencies due to the limitations of inexpensive measurement equipment. Hence, the FAA is genuinely missing these impacts from a physics point of view. The FAA has already paid for a very high quality LFN study through\u0000 Project 1 in the PARTNER Center of Excellence (predecessor of the current ASCENT center). That project completed in 2007. The present author was not a participant in PARTNER Project 1, but he closely observed the amazing work done by the investigators from The Pennsylvania State University,\u0000 Purdue University, and the University of Central Florida. If sufficient LFN data is regularly obtained at larger airports with improved noise monitoring equipment, then FAA could include supplemental metrics, such as the number of low-frequency noise events in a given period. [Work supported\u0000 by the Penn State College of Engineering and its United Technologies Corporation Professorship.]","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 33","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The two-cavity method for characterizing acoustical materials-an interlaboratory study 表征声学材料的双腔法--实验室间研究

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0020

Martha C. Brown, Anthony Ciletti, Bhisham Sharma

{"title":"The two-cavity method for characterizing acoustical materials-an interlaboratory study","authors":"Martha C. Brown, Anthony Ciletti, Bhisham Sharma","doi":"10.3397/nc_2024_0020","DOIUrl":"https://doi.org/10.3397/nc_2024_0020","url":null,"abstract":"The study focuses on understanding the sound absorption and transmission characteristics of porous acoustical materials, which are determined by two key parameters independent of material thickness: characteristic impedance and propagation constant. These parameters can be characterized\u0000 by testing a porous sample concept in a normal incidence impedance tube using either the two-thickness or the two-cavity method. In the two-thickness method, two samples of varying thicknesses are required. In contrast, the two-cavity method requires testing one sample at two air cavity depths.\u0000 This method is particularly advantageous for materials that are costly or challenging to fabricate. This interlaboratory study evaluates the variability of characteristic properties determined using the two-cavity method. Porous acoustical materials were additively manufactured and tested\u0000 in the Liner Technology Facility at NASA Langley Research Center and the Mechanics, Acoustics and Dynamics Lab (MADLab) at Michigan Technological University. The characteristic properties, derived from various cavity depth combinations, were used to predict the sound absorption curves of the\u0000 sample with a rigid backing. These predictions were then compared with actual experimental absorption curves. The findings indicate that both the combinations of cavity depths and the sample's static airflow resistivity significantly influence the accuracy of the deduced properties.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 32","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rail noise comparison of FTA methodology with CadnaA modeling at Bronx development site 布朗克斯开发地块 FTA 方法与 CadnaA 建模的铁路噪声比较

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0090

N. C. Neuman, Smitha Krishnan

引用次数: 0

Industrial centrifugal gas compressor sound emission comparison across speed lines 跨速度线的工业离心式气体压缩机声排放比较

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0103

Corey Fuzak

引用次数: 0

The future of ANSI/ASA S12.2 and room noise criteria ANSI/ASA S12.2 的未来和室内噪音标准

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0059

Brandon Cudequest

引用次数: 0