INTER-NOISE and NOISE-CON Congress and Conference Proceedings最新文献

Thinking inside the box: a cost-effective approach to fan array noise reduction 框内思考：降低风扇阵列噪音的成本效益方法

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0164

Nick Pietrusinski, Jeffrey E. Babich

{"title":"Thinking inside the box: a cost-effective approach to fan array noise reduction","authors":"Nick Pietrusinski, Jeffrey E. Babich","doi":"10.3397/nc_2024_0164","DOIUrl":"https://doi.org/10.3397/nc_2024_0164","url":null,"abstract":"Noise from fan arrays can contribute high sound pressure levels both to buildings and communities. Noise that travels from these units through ducts and into the spaces within buildings can be attenuated with silencers or duct lining. However, sound radiated from the unit through building\u0000 structures or into communities can be more difficult to attenuate and often adds significant cost. While it is possible to attenuate sound from the unit using enclosures or sound walls, exploring the operation of the fan arrays themselves could be a more cost-effective noise reduction method.\u0000 One particular noise reduction method for an existing fan array was proposed for a customer: review sound levels of each fan within the array to determine how they are contributing to the radiated sound power level of the unit. The assumption that sound levels between individual fans within\u0000 fan arrays are consistent is not always correct. A series of acoustical tests were completed; results indicated that sound caused by turbulent airflow within the tested fan array was able to be lowered by reducing the fan speeds of individual fans. By reducing the fan speeds of problematic\u0000 fans and increasing speeds for the quieter ones within the same fan array, the same level of cooling can be provided with lower overall radiated sound levels at no additional cost.","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":"141833945","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

Enforcement against vehicle noise from aftermarket parts in the United States: a qualitative analysis of stakeholders' opinions 美国针对汽车售后零部件噪音的执法：对利益相关者意见的定性分析

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0157

Imran Dharamsi, Erica Walker

{"title":"Enforcement against vehicle noise from aftermarket parts in the United States: a qualitative analysis of stakeholders' opinions","authors":"Imran Dharamsi, Erica Walker","doi":"10.3397/nc_2024_0157","DOIUrl":"https://doi.org/10.3397/nc_2024_0157","url":null,"abstract":"Background: Disruptive environmental sounds, estimated to impact at least 145 million Americans, correlate with higher risk for hypertension, adverse cardiovascular events, and hearing loss. Traffic noise, especially from vehicles with aftermarket parts, is a major contributor to environmental\u0000 noise. Restrictions on vehicle noise vary by state and are rarely enforced. Aim: To understand perspectives of individuals, government officials, and special interests regarding vehicle noise enforcement. Methods: Two focus groups and 27 one-on-one interviews were conducted, primarily on Zoom.\u0000 The stakeholders interviewed were: 13 concerned residents, two auto shop owners, 8 auto enthusiasts, two police departments, one city councilor, and one special interest group. Call guides were developed based on background research and 238 written comments. Interviews were transcribed, summarized,\u0000 and analyzed using qualitative coding. Results: While residents and enthusiasts agree drivers must be considerate, only enthusiasts prefer neighbor dialogue to government enforcement. Government officials favor in-person police enforcement but are considering acoustic cameras and other targeted\u0000 approaches. All agree that vehicle noise should not be prioritized over more serious public safety matters. Conclusion: An effective compromise is possible. Governments should continue in-person noise enforcement while altering the built environment and beginning publicity campaigns to discourage\u0000 noisy and reckless driving.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 71","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833884","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

Experimental Demonstration of a Broadband Perfect Absorbing Metasurface For Noise And Vibration Attenuation 用于噪声和振动衰减的宽带完美吸收元表面的实验演示

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0091

Xiaopeng Li, Steve Sorenson, Taehwa Lee

引用次数: 0

Data Center Air-cooled Chiller Broadband and Tonal Noise Control 数据中心风冷冷水机组宽带和音调噪声控制

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0136

Brandon Wallace, Dan Burley, Steffan L. Kollevoll, Steven L. Smith

{"title":"Data Center Air-cooled Chiller Broadband and Tonal Noise Control","authors":"Brandon Wallace, Dan Burley, Steffan L. Kollevoll, Steven L. Smith","doi":"10.3397/nc_2024_0136","DOIUrl":"https://doi.org/10.3397/nc_2024_0136","url":null,"abstract":"Data centers require vast amounts of cooling using large farms of air-cooled chillers as the primary equipment of choice. The amount and nature of noise generated by these chiller farms to the surrounding area can create complaints and the noise control solutions require an understanding\u0000 and knowledge of both broadband and tonal noise. The dominant noise sources on air-cooled chillers are compressors and condenser fans, each of which produce both broadband and tonal noise spectrums. Therefore, noise control solutions should address both the broadband and tonal aspects of the\u0000 source. A common noise control solution for chillers serving data centers is a sound barrier wall and while effective at providing overall broadband noise control, does little in targeting tonal issues. However, a sound barrier wall can be supplemented to address these tonal issues by applying\u0000 source treatments to the chiller, such as a sound cover treatment for the compressors and associated refrigerant piping and sound stacks and intakes for the condenser fans. In addition, barrier walls an create a \"pit\" application impeding chiller condenser fan discharge air resulting\u0000 in recirulation and nuisance trips. Using a sound stack source treatment with a barrier wall can help mitigate this issue while providing attenuation.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833659","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

An appreciation of the research of George Maling 对乔治-马林研究的评价

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0176

David Herrin, David Neihguk, S. Ippili

引用次数: 0

A source-directivity impact assessment for an angle-error model used to compute free-field sound power over a cylindrical enveloping surface 用于计算圆柱包络面上自由声场声功率的角度误差模型的声源指向性影响评估

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0066

Seth Bard

引用次数: 0

Detailed CNEL/Ldn roadway noise calculations vs. estimation methods 详细的 CNEL/Ldn 公路噪声计算与估算方法对比

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0137

Scott Noel

引用次数: 0

Forecasting community response to low-frequency noise 预测社区对低频噪音的反应

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0033

David Nelson

{"title":"Forecasting community response to low-frequency noise","authors":"David Nelson","doi":"10.3397/nc_2024_0033","DOIUrl":"https://doi.org/10.3397/nc_2024_0033","url":null,"abstract":"The most common approach to managing environmental noise is by reference to A-weighted sound levels deemed appropriate for the community. These criteria are usually derived from transportation noise studies for which the relative proportion of low-frequency noise is implicit. Very different\u0000 community reactions can arise when source spectra don't represent those studied. Responses diverge even further when the listeners' context also differs from that originally studied. This is nowhere more evident than in the case of large industrial equipment (such as power plants and gas compressor\u0000 stations) sited in rural areas, due in large part to strong Low-Frequency Noise (LFN). Guidance for forecasting community reaction to LFN is scattered throughout the literature as individual studies employing a diverse assortment of approaches and noise descriptors. The purpose of the present\u0000 paper is to demonstrate a straightforward, comprehensive, and unified forecasting approach suitable for inclusion in ANSI S12.9 Part 4 \"Noise Assessment and Prediction of Long-Term Community Response\", similar in many respects to the method recently deleted from this standard (2005\u0000 Annex D).","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 47","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833742","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

Sound absorption uncertainty in small reverberation chambers 小型混响室吸声的不确定性

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0012

Charles Moritz, Julien Biboud

{"title":"Sound absorption uncertainty in small reverberation chambers","authors":"Charles Moritz, Julien Biboud","doi":"10.3397/nc_2024_0012","DOIUrl":"https://doi.org/10.3397/nc_2024_0012","url":null,"abstract":"Manufacturers in the mobility industry typically measure and specify the sound absorption coefficient of materials using a small reverberation chamber according to SAE J2883. These chambers have a 6 to 25 cubic meter volume, use a 1.0 meter x 1.2 meter sample size and report sound absorption\u0000 in the one-third octave bands from about 400 Hz to 10,000 Hz. This is in contrast to a full-size chamber built to satisfy the requirements of ASTM C423 or ISO 354, which have about a 200 cubic meter volume, use a 2.4 x 2.7 or 3.2 x 3.2 square meter sample size and report sound absorption in\u0000 one-third octave bands from 100 to 5,000 Hz. Although the room and sample size dimensions scale, many of the factors that contribute to uncertainty in the measurement do not scale. These include relative humidity, temperature, and other physical measurements and if the same instrumentation\u0000 is used, microphone calibration and measurement uncertainty in the higher frequency range. This paper examines the potential measurement uncertainty in these chambers over the 400 to 10,000 Hz frequency range and compares this to past uncertainty analyses of full-size chambers over a similar\u0000 frequency range.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833767","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

Case study of automotive NVH topics induced by HVAC systems integration 暖通空调系统集成引发的汽车 NVH 问题案例研究

INTER-NOISE and NOISE-CON Congress and Conference Proceedings Pub Date : 2024-07-14 DOI: 10.3397/nc_2024_0017

S. Bennouna

{"title":"Case study of automotive NVH topics induced by HVAC systems integration","authors":"S. Bennouna","doi":"10.3397/nc_2024_0017","DOIUrl":"https://doi.org/10.3397/nc_2024_0017","url":null,"abstract":"Within the automotive market, HVAC systems are of critical importance in ensuring passengers' thermal comfort inside the car cabin as well as complying with regulatory defogging functions. These systems involve various components such as blowers, thermal exchangers, actuators... over\u0000 a wide range of well-known technologies and also innovations on newly introduced designs and products. Currently, within the established electrification trend worldwide, HVAC systems became one of the most important embedded systems, possibly inducing major contributions of noise and vibration.\u0000 These NVH topics can emerge through various transfer paths inside the car cabin causing significant discomfort to passengers. During development and production stages, the NVH behavior at component level is mastered by both suppliers and OEMS according to internal standards and specifications.\u0000 However, implementation into the complete vehicle can induce a specific NVH behavior unrelated to the compliance status at component level. Integration impact cases are highly reinforced within electrification trends as they involve more and more design changes with less technical background.\u0000 Through a practical case study, this paper focuses on the NVH behavior induced by the integration of HVAC systems in the US market. Transfer paths analysis and solutions are investigated to improve the NVH behavior and set the product intrinsic limits giving the targeted vehicle.","PeriodicalId":514177,"journal":{"name":"INTER-NOISE and NOISE-CON Congress and Conference Proceedings","volume":" 29","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833994","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