Noise Control Engineering Journal最新文献_第2页

Case study: Acoustic radiation characteristics and mechanism of high-speed railway box-girder bridge 案例研究:高速铁路箱梁桥的声辐射特性及机理

4区工程技术

Noise Control Engineering Journal Pub Date : 2023-07-01 DOI: 10.3397/1/377125

Xiaoan Zhang, Jianjin Yang

{"title":"Case study: Acoustic radiation characteristics and mechanism of high-speed railway box-girder bridge","authors":"Xiaoan Zhang, Jianjin Yang","doi":"10.3397/1/377125","DOIUrl":"https://doi.org/10.3397/1/377125","url":null,"abstract":"The proportion of box-girder bridges in high-speed railways in China is high. The noise caused by trains passing a box-girder bridge is more intense than the noise in other sections of the railway because it is radiated by the bridge. This study investigates the acoustic radiation characteristics and mechanism of the box-girder bridge including low-frequency vibrations below the hearing threshold. The foregoing is examined in terms of natural vibration characteristics, vibration responses of the bridge under nonlinear train–track dynamic interactions, and structural noise radiation principle. The results show that the structural resonance, acoustic radiation efficiency, acoustic–vibration coupling in the bridge cavity, and severe train-induced vibrations play important roles in the acoustic radiation of the box-girder bridge. Under moving train loads, bridge vibrations are mainly in the 80- to 100-Hz frequency range and cause distinct noise radiation. Moreover, the low-frequency (20 Hz) train-induced vibrations of the bridge can generate distinct low-frequency noise. Additionally, the box-girder bridge cavity induces acoustic–vibration coupling, which can aggravate the noise radiation on both sides of the box-girder bridge.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135761900","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

The propagation characteristics of flexural wave in periodic ballast track 周期性道砟轨道中弯曲波的传播特性

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2023-07-01 DOI: 10.3397/1/377120

Q. Feng, Zhou Yang, W. Guo, Jianfei Lu, Yuxiong Liang

{"title":"The propagation characteristics of flexural wave in periodic ballast track","authors":"Q. Feng, Zhou Yang, W. Guo, Jianfei Lu, Yuxiong Liang","doi":"10.3397/1/377120","DOIUrl":"https://doi.org/10.3397/1/377120","url":null,"abstract":"The vertical vibration band gap characteristics of the ballast track were investigated in this paper. The rail was simplified as a beam with double layer of periodic supports. The dispersion characteristics were studied considering the rail as Timoshenko beam, using the plane wave expansion\u0000 method. The eigenvalue equation of the Timoshenko beam with complex boundary conditions, which was a problem for the traditional plane wave expansion method, has been solved using special mathematical solution of matrix inversion. The band gap of the flexural waves in periodic track structure\u0000 was confirmed by the rail vibration transmission characteristics obtained from the experiments. The physical significance of band gap frequency was analyzed in detail in this paper. In addition, we give a more accurate prediction model of Bragg band gap frequency of periodic track structure\u0000 compared previous studies. The band gap of the flexural waves in periodic track structure was confirmed by the rail vibration transmission characteristics obtained from the experiments. The influence of temperature force on the band gap characteristics of the flexural waves was also analyzed,\u0000 and a sensitivity index of temperature force was given as a result. The results indicate that the square of the band gap frequency has a linear relation with the longitudinal temperature force, which is different from the previous research.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43938371","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

A new speech enhancement method based on Swin-UNet model 一种基于swing - unet模型的语音增强新方法

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2023-07-01 DOI: 10.3397/1/377122

Chengli Sun, Weiqi Jiang, Y. Leng, Feilong Chen

引用次数: 0

Case study: Hybrid inverse method for aircraft noise abatement isolator: Experimental and vibroacoustic assessment 案例研究:飞机降噪隔振器的混合逆方法:实验与振动声学评估

4区工程技术

Noise Control Engineering Journal Pub Date : 2023-07-01 DOI: 10.3397/1/377124

Wafaa El Khatiri, Raef Cherif, Khalid El Bikri, Noureddine Atalla

{"title":"Case study: Hybrid inverse method for aircraft noise abatement isolator: Experimental and vibroacoustic assessment","authors":"Wafaa El Khatiri, Raef Cherif, Khalid El Bikri, Noureddine Atalla","doi":"10.3397/1/377124","DOIUrl":"https://doi.org/10.3397/1/377124","url":null,"abstract":"In the aeronautical industry, the vibrations generated by mechanical systems produce unwanted noise perceived by users, which affects their comfort. Engineers encounter several difficulties in carrying out experimental measurements when studying complex systems. To solve this problem, a solution was proposed for the manufacturers' benefit, allowing them to access the various identified measurement points, describe the systems' vibroacoustic behavior, whether coupled or decoupled, and share the work between several teams and reduce the time spent on measurements. This paper deals with the experimental study performed on an aircraft noise abatement isolator. The component-based transfer path analysis hybrid inverse method is developed to allow the work on the subsystems separately between several teams and characterize them on an external test bench outside real functioning conditions. The studied system consists of a mass coupled by a noise abatement isolator fixed in an aluminum plate backed by a concrete cavity. Several parameters are studied such as the number of transfer paths to be considered to see the effect of neglecting certain transfer paths, the effects of coupling versus decoupling of the connected substructures and the number of indicator points chosen and used in the inversion method. The results are compared to the direct method.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135761899","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

Improvement of a soundproofing vent hole 隔音通风孔的改进

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2023-05-01 DOI: 10.3397/1/377119

Nishimura Sohei, Nishimura Yuya, Tsukamoto Akifumi

引用次数: 0

Case study: Analysis and research on pipeline vibration of liquid oxygen kerosene of rocket engine and vibration reduction measures Measures 案例分析：火箭发动机液氧煤油管道振动分析研究及减振措施

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2023-05-01 DOI: 10.3397/1/377114

S. Yong, Gong Wu-qi

{"title":"Case study: Analysis and research on pipeline vibration of liquid oxygen kerosene of rocket engine and vibration reduction measures Measures","authors":"S. Yong, Gong Wu-qi","doi":"10.3397/1/377114","DOIUrl":"https://doi.org/10.3397/1/377114","url":null,"abstract":"Abnormal vibration often occurs in the liquid oxygen kerosene transmission pipe- line of rocket engines, seriously threatening the safety of rocket engines. Improper handling will result in rocket launch failure and enormous economic losses. Therefore, the vibration of the transmission\u0000 pipeline must be studied. In this paper, a three-dimensional high-pressure transmission pipeline model comprising a corrugated pipe, a multi-section bending pipe, and other auxiliary structures is established. Using the two-way fluid–solid coupling method, vibration analysis is performed\u0000 on the pipeline under external pressure pulse excitation. The accuracy of the computation results is verified by a thermal test. Two vibration reduction strategies are presented and validated by simulation in accordance with the findings of the vibration study. The main conclusions are as\u0000 follows: (1) At the same frequency, the amplitude distribution of vibration acceleration significantly correlates with the flow field pressure, indicating that fluid pressure fluctuation is the root cause of the abnormal vibration of the pipeline, and the vibration of the pipeline increases\u0000 with the average pressure. (2) The time-average value and fluctuation amplitude of the larger stress and strain are mainly concentrated in the two supports, namely, the inside of the elbow and the bellows, which is different from the distribution of vibration acceleration. Such places are\u0000 prone to structural failure and should be given attention. (3) The guide plate and the support enhancement method can reduce the vibration, but the support enhancement method has a better effect, reducing the vibration velocity and acceleration by 86.4% and 93%, respectively.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46461783","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 duct length of ducted fans for minimizing first blade-passing frequency noise 最小化第一叶片通过频率噪声的风机最佳风管长度

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2023-05-01 DOI: 10.3397/1/377116

Min-Hyeok Kim, Suk-Yoon Hong, Jee-hun Song, Beom-Jin Joe, Woen-Sug Choi

引用次数: 0

State of the art of rational design of efficient mufflers 合理设计高效消声器的技术现状

4区工程技术

Noise Control Engineering Journal Pub Date : 2023-05-01 DOI: 10.3397/1/377115

M.L. Munjal, K.M. Kumar

{"title":"State of the art of rational design of efficient mufflers","authors":"M.L. Munjal, K.M. Kumar","doi":"10.3397/1/377115","DOIUrl":"https://doi.org/10.3397/1/377115","url":null,"abstract":"An efficient exhaust muffler needs to satisfy the rather conflicting requirements of adequate insertion loss (IL) with limited back pressure, weight, size and cost. The unmuffled exhaust noise of an internal combustion engine peaks at the engine firing frequency and the first few harmonics thereof. Designing the muffler (a wide-band low pass acoustical filter) for such low frequencies is quite a challenge. Therefore, design of efficient mufflers has remained an art as well as science. During the last two decades or so, however, (a) multi-hole cross-flow perforates, (b) multiply connected perforated pipes and baffles, and (c) the double-tuned, grazing-flow concentric tube resonators have emerged as promising constituent elements. In this paper, elements (a) and (c) have been combined ingeniously to synthesize efficient muffler configuration for diesel generator (DG) sets as well as automotive engines. Relatively simpler lumped parameter approximation for perforates opening into cavities, electro-acoustic analogies, and the simple expansion chamber equivalence of the double-tuned concentric tube resonator have been used to develop a rational design methodology. A novel feature of this methodology is incorporation of the given back-pressure limit into the acoustic design process. The resulting muffler configurations are robust and can be scaled up (and down) easily for IL as well as back pressure.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135345190","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

Estimating effective acoustic properties of various configuration of perforated panels 估算不同穿孔板结构的有效声学特性

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2023-05-01 DOI: 10.3397/1/377118

J. Dandsena

{"title":"Estimating effective acoustic properties of various configuration of perforated panels","authors":"J. Dandsena","doi":"10.3397/1/377118","DOIUrl":"https://doi.org/10.3397/1/377118","url":null,"abstract":"Acoustic metamaterial attains uncommon material properties over natural material such as negative effective mass density, negative effective bulk modulus, or both. To start with, the present research demonstrates and establishes robust method to estimate and measure acoustic metamaterial\u0000 properties of a Helmholtz resonator analytically using transfer matrix (TM) method and experimentally in detail. The proposed method extracts the reflection and transmission coefficients from corresponding TM to evaluate the effective acoustic metamaterial properties. For a single Helmholtz\u0000 resonator, the effective bulk modulus has been observed negative; however, the effective density remains positive. In order to attain double negative material properties, the perforated panel (PP) and microperforated panel (MPP) have been introduced in parallel to resonator. The 1D electro-acoustic\u0000 modeling has been carried out for all configurations to estimate effective properties analytically. Successively, the experiments have been conducted to measure the effective properties from acoustic metamaterial prospective. The analytical and experimental investigations on five different\u0000 cases reveal that one can attain negative effective compressibility and effective density by cascading two PPs or MPPs with a finite duct. Moreover, by backing a Helmholtz resonator from both sides with two PPs or MPPs in parallel, one can attain double negative properties comparatively higher\u0000 than earlier configuration in low-frequency zone in broadband. In total, eight different configurations have been investigated analytically and experimentally, where it has been demonstrated that the proposed compact model is more effective than a finite array of same Helmholtz resonators.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44725577","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

Development of an empirical model for the prediction of the noise reduction coefficient for thin and low-density fibrous materials 开发了一种预测薄和低密度纤维材料降噪系数的经验模型

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2023-05-01 DOI: 10.3397/1/377117

Regan Dunne, Dawood Desai, S. Heyns

引用次数: 0