Noise Control Engineering Journal最新文献_第10页

Broadband low-frequency noise reduction using Helmholtz resonator-based metamaterial 基于亥姆霍兹谐振腔的超材料的宽带低频降噪

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-07-01 DOI: 10.3397/1/376932

Jhalu Gorain, C. Padmanabhan

{"title":"Broadband low-frequency noise reduction using Helmholtz resonator-based metamaterial","authors":"Jhalu Gorain, C. Padmanabhan","doi":"10.3397/1/376932","DOIUrl":"https://doi.org/10.3397/1/376932","url":null,"abstract":"Achieving broadband noise attenuation at low frequencies is still a significant challenge. Helmholtz resonators offer good low-frequency noise attenuation but are effective only over a narrow band; the cavity volume required at these frequencies is also larger. This article proposes\u0000 a new broadband acoustic metamaterial (AMM) absorber, which uses polyurethane (PU) foam embedded with small-size resonators tuned to different frequencies. The AMM design is achieved in three phases: (1) develop a transfer-matrix-based one-dimensionalmodel for a resonator with intruded neck;\u0000 (2) use this model to develop a novel band broadeningmethod, to select appropriate resonators tuned to different frequencies; and (3) construct a unit cell metamaterial embedded with an array of resonators into PU foam. A small-size resonator tuned to 415 Hz is modified, by varying the intrusion\u0000 lengths of the neck, to achieve natural frequencies ranging from 210 to 415 Hz. Using the band broadening methodology, 1 unit cell metamaterial is constructed; its effectiveness is demonstrated by testing in an acoustic impedance tube. The broadband attenuation characteristics of the constructed\u0000 unit cell metamaterial are shown to match well with the predicted results. To demonstrate further the effectiveness of the idea, a metamaterial is formed using 4 periodic unit cells and is tested in a twin room reverberation chamber. The transmission loss is shown to improve significantly,\u0000 at low frequencies, due to the inclusion of the resonators.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42148486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Case study: Correlation between boundary and finite element determination of large silencer transmission loss 案例研究:边界与大消声器传播损失有限元计算的关系

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-07-01 DOI: 10.3397/1/376927

K. Ruan, T. Wu, D. Herrin

{"title":"Case study: Correlation between boundary and finite element determination of large silencer transmission loss","authors":"K. Ruan, T. Wu, D. Herrin","doi":"10.3397/1/376927","DOIUrl":"https://doi.org/10.3397/1/376927","url":null,"abstract":"Silencers used in the power generation industry generally have large ducts entering and leaving the silencer. With large cross-sectional dimensions, the plane wave cutoff frequency will be exceeded at a low frequency so that transmission loss can no longer be evaluated by assuming constant\u0000 sound pressure over a cross-section. More sophisticated calculation and processing approaches are necessary. In this research, the boundary element method is used in conjunction with a reciprocal identity method to determine the transmission loss for rectangular and circular cross-sections:\u0000 the two configurations that cover most real-world designs. The boundary element method is compared to a finite element method strategy where the transmission loss is determined using an automatically matched layer boundary condition at the inlet and outlet. This approach can be used in most\u0000 commercial software. Although these two approaches have little in common, transmission loss results compare well with one other. Validation by comparison is helpful because analytical solutions are only available for simple axisymmetric cases. Methods are compared for practical configurations\u0000 like parallel-baffle silencers and reactive silencers.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46300818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 of a thick micro-perforated panel with tapered sections 具有锥形截面的厚微孔板的吸声性能

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-07-01 DOI: 10.3397/1/376930

H. Liyan, Chenxi Li, Hu Ying, Haitao Wang, Ran Qing, Haiquan Wu

引用次数: 0

Case study: Purdue University's "Clapping Circle": An acoustical investigation 案例研究：普渡大学的“拍手圈”：声学调查

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-07-01 DOI: 10.3397/1/376928

Elspeth A. Wing, Steven J. Herr, Alexander D. Petty, Alexander K. Dufour, Frederick H. Hoham, Morgan E. Merrill, Donovan W. Samphier, Weimin Thor, Kushagra Singh, Y. Xue, D. Huston, J. Bolton

{"title":"Case study: Purdue University's \"Clapping Circle\": An acoustical investigation","authors":"Elspeth A. Wing, Steven J. Herr, Alexander D. Petty, Alexander K. Dufour, Frederick H. Hoham, Morgan E. Merrill, Donovan W. Samphier, Weimin Thor, Kushagra Singh, Y. Xue, D. Huston, J. Bolton","doi":"10.3397/1/376928","DOIUrl":"https://doi.org/10.3397/1/376928","url":null,"abstract":"The perplexing acoustical properties of a landscape architecture feature of Academy Park on the Purdue University campus have long been the subject of speculation. The feature, known informally as the \"Clapping Circle\", consists of sixty-six concentric rings of stone tiles.\u0000 When someone claps while at the middle of the circle, they hear a high-pitched squeak immediately afterwards. Experiments were conducted by the Purdue student chapter of the Acoustical Society of America to characterize this effect. The response to a clap played from an omnidirectional speaker\u0000 placed at the center of the circle was recorded using a microphone positioned above the loudspeaker. Spectrograms of the recorded responses revealed the squeak to consist of a descending tone and its harmonics. This tone disappeared from the spectrogram when the tiles were covered with absorbing\u0000 blankets. A model based on scattering from the bevels between the tile rings reproduced the descending frequency of the squeak. Similarly to famous stepped structures with notable acoustics, the tiles were found to scatter sound best when the wavelength was not larger than the tiles' spatial\u0000 period. Thus, it was concluded that the squeak is an example of an acoustical diffraction grating which creates a repetition pitch caused by scattering from the tile formation.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45637494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimal design of noise reduction and shape modification for traction gears of EMU based on improved BP neural network 基于改进BP神经网络的动车组牵引齿轮降噪改形优化设计

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-07-01 DOI: 10.3397/1/376934

Zhaoping Tang, Min Wang, Xiaoying Xiong, Manyu Wang, Jianping Sun, Li Yan

{"title":"Optimal design of noise reduction and shape modification for traction gears of EMU based on improved BP neural network","authors":"Zhaoping Tang, Min Wang, Xiaoying Xiong, Manyu Wang, Jianping Sun, Li Yan","doi":"10.3397/1/376934","DOIUrl":"https://doi.org/10.3397/1/376934","url":null,"abstract":"Under high-speed operating conditions, the noise caused by the vibration of the traction gear transmission system of the Electric Multiple Units (EMU) will distinctly reduce the comfort of passengers. Therefore, analyzing the dynamic characteristics of traction gears and reducing noise\u0000 from the root cause through comprehensive modification of gear pairs have become a hot research topic. Taking the G301 traction gear transmission system of the CRH380A high-speed EMU as the research object and then using Romax software to establish a parametric modification model of the gear\u0000 transmission system, through dynamics, modal and Noise Vibration Harshness (NVH) simulation analysis, the law of howling noise of gear pair changes with modification parameters is studied. In the small sample training environment, the noise prediction model is constructed based on the priority\u0000 weighted Back Propagation (BP) neural network of small noise samples. Taking the minimum noise of high-speed EMU traction gear transmission as the optimization goal, the simulated annealing (SA) algorithm is introduced to solve the model, and the optimal combination of modification parameters\u0000 and noise data is obtained. The results show that the prediction accuracy of the prediction model is as high as 98.9%, and it can realize noise prediction under any combination of modification parameters. The optimal modification parameter combination obtained by solving the model through\u0000 the SA algorithm is imported into the traction gear transmission system model. The vibration acceleration level obtained by the simulation is 89.647 dB, and the amplitude of the vibration acceleration level is reduced by 25%. It is verified that this modification optimization design can effectively\u0000 reduce the gear transmission.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42976222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 multiple-layer versus multiple-cavity microperforated panels for sound absorption at low frequency 多层与多腔微孔板低频吸声性能的比较

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-07-01 DOI: 10.3397/1/376931

P. Cobo, F. Simón, C. Colina

引用次数: 1

Study on sound transmission loss modeling through simplified sealing specimens and an automotive door sealing system 基于简化密封试样和汽车门密封系统的传声损失模型研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-07-01 DOI: 10.3397/1/376929

Guoming Deng, Jianwang Shaob, Songlin Zheng, Xian Wu

{"title":"Study on sound transmission loss modeling through simplified sealing specimens and an automotive door sealing system","authors":"Guoming Deng, Jianwang Shaob, Songlin Zheng, Xian Wu","doi":"10.3397/1/376929","DOIUrl":"https://doi.org/10.3397/1/376929","url":null,"abstract":"An imperfect sealing system would be the main path of the noise propagating into the interior compartment of a high-speed vehicle. The study on the sound insulation modeling of automotive door sealing systems, which involve complicated threedimensional sealing structures and gap cavities, has attracted more and more attention. This study employs hybrid finite element–statistical energy analysis (FE-SEA) models to predict the sound transmission loss of three simplified sealing specimens and an actual automotive door sealing system. For the actual sealing system under compression, a three-dimensional FEmodel is built to simulate the nonlinear compression, which can acquire the compressed geometries and pre-stress modal results of the seals for further prediction of the sound transmission loss. The hybrid FE-SEA method is firstly verified by the experimental result of a double plate vibro-acoustic system and another numerical method. Several factors concerning the modeling, including the boundary conditions, the equivalent elastic modulus for the hyper-elastic rubber, the specimen length, and the structural grid size, are considered to study their impacts on the sound transmission loss. The effects of using shell elements and using solid elements to model the sealing rubber layers are also compared. The results of this study can provide guides regarding the trade-off between the modeling efficiency and accuracy, so that it has significance for engineering modeling, as well as the design and optimization of automotive door sealing systems.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42109966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sound Propagation Outdoors 户外声音传播

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-06-18 DOI: 10.1201/9780429428876-4

C. Hansen, K. Hansen

引用次数: 0

Loudness, Descriptors of Noise, Noise Criteria and Instrumentation 响度，噪声描述，噪声标准和仪器

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-06-18 DOI: 10.1201/9780429428876-2

C. Hansen, K. Hansen

引用次数: 0

Sound in Rooms 室内声音

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-06-18 DOI: 10.4324/9780203473948_chapter_4

C. Hansen, K. Hansen

引用次数: 0