INTER-NOISE and NOISE-CON Congress and Conference Proceedings最新文献_第2页

Source characterization of a ducted source using acoustic free velocity 利用声学自由声速确定管道声源的声源特征

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0173

David Neihguk, D. Herrin, Ke Luo

{"title":"Source characterization of a ducted source using acoustic free velocity","authors":"David Neihguk, D. Herrin, Ke Luo","doi":"10.3397/nc_2024_0173","DOIUrl":"https://doi.org/10.3397/nc_2024_0173","url":null,"abstract":"A common method to characterize linear time invariant ducted acoustic sources is the electro-acoustic analogy. The sources are typically defined by their internal source strength and source impedance. Various methods have emerged to determine the source characteristics, broadly categorized\u0000 into direct and indirect methods. Direct methods involve using a secondary source with significantly higher amplitude to measure source impedance but cannot determine source strength. Indirect methods vary acoustic loads to obtain both source strength and source impedance, accuracy depends\u0000 on appropriate load combinations. In this research, we propose an inverse method to determine the acoustic source strength from the measured acoustic transfer function and the operational acoustic pressure. This approach yields what we term as the \"acoustic free velocity,\" corresponding\u0000 to a plane monopole source that characterizes the original sound source. Subsequently, the source impedance is obtained using the acoustic free velocity in conjunction with the load impedance and acoustic pressure in the acoustic circuit. The method is demonstrated using a compressor driver\u0000 source attached to a 1 3/8\" impedance tube. Validation of the measured source strength and source impedance is conducted using a two-load method. Additionally, prediction of muffler insertion loss shows a good correlation with experimental measurements, affirming the efficacy of the proposed\u0000 methodology.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 54","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833850","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

Extremely low-vibration experiments with resolutions nanometer range supported on air tables may also require a low-noise environment 在空气台上进行纳米级分辨率范围的极低振动实验也可能需要低噪音环境

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0124

M. Gendreau, H. Amick

{"title":"Extremely low-vibration experiments with resolutions nanometer range supported on air tables may also require a low-noise environment","authors":"M. Gendreau, H. Amick","doi":"10.3397/nc_2024_0124","DOIUrl":"https://doi.org/10.3397/nc_2024_0124","url":null,"abstract":"The paper reports key results from an extensive diagnostic study examining a room's vibration and acoustic noise environments and their correlation to measurement noise. Vibrations of unknown origin were contaminating research being performed on highly vibration-sensitive apparatus\u0000 in the basement of a recently completed engineering building. The research involved extensive single‐molecule microscopy requiring resolutions down to 1 nm carried out on an optical table supported on pneumatic legs. Researchers reported that the experimental noise was reported to be\u0000 of random amplitude less than 40 nm. The problem did not appear to correlate with obvious building or personnel activities. The design vibration and noise criteria for the new space had been VC-E and NC-40, respectively. At the time of the study, the ambient floor vibrations were several classes\u0000 better; however, the acoustic environment was slightly worse. FRF correlation was calculated between combinations of the tabletop and floor vibrations and airborne sound. The best correlation was between tabletop vibration and airborne sound. The supply air was a significant part of the problem,\u0000 but the ceiling offered very little attenuation from above. Some of the sound was being generated above the ceiling by HVAC components other than the supply air.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141834005","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

Application of Microperforated Panel Parallel Baffle Silencers in Ducts 微穿孔板平行障板消音器在管道中的应用

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0175

Caoyang Li, David Herrin

引用次数: 0

Underwater sound from rotary oscillator and pile driving construction activities - I-205 Bridge over the Willamette River - I-205 Abernethy Bridge, Oregon 旋转振荡器和打桩施工活动产生的水下声音 - 威拉米特河上的 I-205 大桥 - 俄勒冈州 I-205 Abernethy 大桥

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0126

James Reyff, Adwait Ambaskar

{"title":"Underwater sound from rotary oscillator and pile driving construction activities - I-205 Bridge over the Willamette River - I-205 Abernethy Bridge, Oregon","authors":"James Reyff, Adwait Ambaskar","doi":"10.3397/nc_2024_0126","DOIUrl":"https://doi.org/10.3397/nc_2024_0126","url":null,"abstract":"The Oregon Department of Transportation (ODOT) is conducting construction work in the Willamette River that involved the installation of piles through the water. There is a potential for impacts to wildlife, primarily fish, due to high noise levels. The project added piers to the existing\u0000 bridge that consist of 12-foot diameter pile casings and drilled shafts. These casings are installed through rotary-oscillation drilled shafts that extended well below the water. These piles extend 200 feet below the river bottom. A large rotary oscillator was required to install the casings,\u0000 which was supported on temporary platforms constructed in water. The platforms were supported by hollow 36-inch diameter steel piles. Underwater sounds from rotary oscillators have not been measured extensively in the past. This paper describes the underwater sound levels and characteristics\u0000 of drilling large diameter casings deep through the substrate using the rotary oscillator. Measurements were also conducted for impact pile driving sounds from installation of the 36-inch diameter piles. The sound measurements evaluated the effectiveness of air bubble curtains meant to reduce\u0000 sound from impact pile driving and meet permit requirements to minimize exposure of fish to harmful sound levels.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141834088","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

Comparison of Ensemble vs One-Third Octave Band Averaging of Field Collected Decays 现场采集衰变的集合与三分之一倍频程频带平均值的比较

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0180

Matthew V. Golden

引用次数: 0

The Impact of Vessel/Ship Noise on the Productivity and Well-being of Maritime Crew: A Holistic Examination 船舶/船只噪音对海事船员生产力和福祉的影响：全面考察

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0006

Solomon Ologe, Ufuoma Peter Anaidhuno, Idowu Mushafau Oshundairo

{"title":"The Impact of Vessel/Ship Noise on the Productivity and Well-being of Maritime Crew: A Holistic Examination","authors":"Solomon Ologe, Ufuoma Peter Anaidhuno, Idowu Mushafau Oshundairo","doi":"10.3397/nc_2024_0006","DOIUrl":"https://doi.org/10.3397/nc_2024_0006","url":null,"abstract":"This comprehensive survey examines the impact of vessel/ship noise on the productivity and well-being of 500 maritime crew members. The study explores the multifaceted repercussions of regular exposure to ship-related noise on both the operational efficiency and overall health of seafarers.\u0000 Through an extensive examination of existing literature and first-hand assessments, the research delves into the physiological and psychological effects of vessel noise on crew members. Statistical Package for the Social Sciences (SPSS) and descriptive geometry were utilized to analyse the\u0000 field response data. Additionally, it evaluates the potential implications for maritime safety and productivity. Investigated noise levels range from 60 to 110 dB, observed productivity ranges from 40 to 90%, and well-being ranges from 60 to 95%. The findings from this survey offer valuable\u0000 insights to the maritime industry, illuminating the complex relationship between ship noise, crew well-being, and operational performance. Keywords: Maritime Noise Impact, Crew Well-being, Holistic Examination, Productivity Challenges and Vessel Sound Effects.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 27","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833918","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

On the modeling of urban air mobility vehicle takeoff and landing operations in the FAA Aviation Environmental Design Tool 关于美国联邦航空局航空环境设计工具中的城市空中交通车辆起降操作建模

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0035

Stefan J. Letica, Stephen A. Rizzi

{"title":"On the modeling of urban air mobility vehicle takeoff and landing operations in the FAA Aviation Environmental Design Tool","authors":"Stefan J. Letica, Stephen A. Rizzi","doi":"10.3397/nc_2024_0035","DOIUrl":"https://doi.org/10.3397/nc_2024_0035","url":null,"abstract":"Urban air mobility (UAM) vehicles are anticipated to operate in close proximity to the public. A possible barrier to the introduction of UAM vehicles as a transit solution is their community noise impact, particularly around vertiports. The Federal Aviation Administration Aviation Environmental\u0000 Design Tool (AEDT) is the mandated tool to assess aircraft noise and other environmental impacts due to federal actions at civilian airports, vertiports, or in U.S. airspace for commercial flight operations. However, AEDT was designed to model fixed-wing aircraft and conventional helicopter\u0000 operations, not UAM vehicles. Prior work by the authors showed significant differences in noise contours of UAM departures and approaches when modeling operations as fixed-wing and helicopter types in AEDT. This paper identifies the sources of those differences. Additionally, a NASA time-marching\u0000 simulation tool is used to generate noise exposure data for equivalent operations to help identify differences associated with the integrated noise model implemented in AEDT and offer possible changes to assess UAM community noise impact more consistently with simulation-based modeling.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 92","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833695","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

A case study of residential waste plumbing noise control 住宅垃圾管道噪音控制案例研究

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0187

Jeff Fullerton

引用次数: 0

Evaluation of steering wheel vibration in electric vehicles and application to Dynamic Motor Drive 电动汽车方向盘振动评估及对动态电机驱动的应用

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0185

Vijay Srinivasan, Vibhor Kumar Rajput

引用次数: 0

Modeling noise from large-scale data center equipment 大型数据中心设备噪音建模

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0037

Adam Buck

引用次数: 0