Noise and Vibration Worldwide最新文献_第5页

Modeling of a two-axle rail vehicle for state estimation 用于状态估计的双轴轨道车辆建模

Noise and Vibration Worldwide Pub Date : 2023-03-16 DOI: 10.1177/09574565231161649

R. Sharma, Sono Bhardawaj, L. Gopala Rao, Shashi Bahl

引用次数: 0

Resonant air coupled inspection of glass fiber reinforced polymer composite plate using single sided access of near and far side of low velocity impact damage 玻璃纤维增强聚合物复合材料板低速冲击损伤远侧和近侧单通道的共振空气耦合检测

Noise and Vibration Worldwide Pub Date : 2023-03-14 DOI: 10.1177/09574565231161650

N. Hanuman, T. Bose

{"title":"Resonant air coupled inspection of glass fiber reinforced polymer composite plate using single sided access of near and far side of low velocity impact damage","authors":"N. Hanuman, T. Bose","doi":"10.1177/09574565231161650","DOIUrl":"https://doi.org/10.1177/09574565231161650","url":null,"abstract":"Resonance based nonlinear techniques works efficiently in detecting small size damages in the composite structures. Local defect resonance (LDR) is a resonance based nonlinear technique which enables to activate the damage directly. In this study, recently developed LDR based automated methodology is carried out from far side of the impact damage to detect the LDR frequency and mode shape of the impact damage. This methodology is implemented by carrying out experiments on glass fibre reinforced polymer (GFRP) plate using air coupled emission (ACE) technique. This plate contains three artificial delaminations and one low velocity impact damage. Initially, the LDR frequency and mode shape of each damage is accomplished using ACE testing, justified with Laser Doppler Vibrometry (LDV). Later, the Otsu’s algorithm is performed to get the accurate size of the impact damage. Subsequently, a broadband backward sweep is used to detect all delamination including the impact damage. Then, maximum amplitude of each frame has been found from output data of all spatial nodes. Later, the LDR frequency frame (N L ) has been identified in the time domain from the slope and curvature plots followed by Discrete Fourier Transform (DFT) to detect the LDR frequency and mode shape of the damage. So, it has been observed that less than defect size is obtained when inspected from the far side. Further, this method will be extended to find out the depth of individual damage.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"194 - 203"},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47695486","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

Monitoring of traffic noise pollution in urban Patna, Bihar, India 印度比哈尔邦巴特那市交通噪声污染监测

Noise and Vibration Worldwide Pub Date : 2023-03-13 DOI: 10.1177/09574565231161644

R. Ranjan, Saurabh Kumar, Reena Singh

{"title":"Monitoring of traffic noise pollution in urban Patna, Bihar, India","authors":"R. Ranjan, Saurabh Kumar, Reena Singh","doi":"10.1177/09574565231161644","DOIUrl":"https://doi.org/10.1177/09574565231161644","url":null,"abstract":"Road traffic noise is a major environmental issue that has been faced by many people around the world, including in Patna city. There is a need to investigate noise regularly because of the rapidly increasing traffic volume. This study focuses on the estimation of the urban traffic noise level in Patna, Bihar, India. Based on a preliminary survey of traffic volume, 12 stations were selected. A sound meter was used to measure the “A”-weighted noise level. Noise parameters like L10, L50, and L90 were evaluated from the collected noise data. And these noise parameters were used for the calculation of noise pollution indices like Noise Climate (NC), Equivalent Continuous Noise Level (Leq), Noise Pollution Level (NPL), and Traffic Noise Index (TNI). These noise indices compare with the standard limit of the Central Pollution Control Board (CPCB). The equivalent continuous noise level (Leq) measured at different locations in the commercial cum residential zones varies from 77.7 dBA to 92.5 dBA, which is higher than the prescribed noise level limit of the CPCB. Other noise indices, such as the NPL and TNI, are found to range from 88.2 dBA to 111.5 dBA and 77.9 dBA to 125.9 dBA, respectively, at various sampling locations and are also higher than the prescribed limit of the CPCB. The noise level of all stations was found to exceed the prescribed limit of the CPCB. There is a strong correlation exists between NPL with TNI and NC (r > 0.5). Also, there is a strong correlation exists between Leq with NPL (r > 0.5). Using NPL as a dependent variable and TNI, NC, and Leq as independent variables, the regression model was completely validated.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"183 - 193"},"PeriodicalIF":0.0,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44804734","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

Numerical assessment of gun mufflers using finite element method, neural networks, and a genetic algorithm 用有限元法、神经网络和遗传算法对枪炮消声器进行数值评估

Noise and Vibration Worldwide Pub Date : 2023-03-07 DOI: 10.1177/09574565231161651

M. Chiu, Ying-Chun Chang

{"title":"Numerical assessment of gun mufflers using finite element method, neural networks, and a genetic algorithm","authors":"M. Chiu, Ying-Chun Chang","doi":"10.1177/09574565231161651","DOIUrl":"https://doi.org/10.1177/09574565231161651","url":null,"abstract":"In order to enhance the acoustical performance of gun mufflers, a multi-chamber muffler internally inserting with expansion cones and perforated tubes ducts is presented. Because of the complicated geometry of gun muffler, traditional analytic method used in predicting a muffler’s acoustical performance is difficult; therefore, a finite element method using the COMSOL software is adopted to predict the gun muffler’s sound transmission loss. Moreover, because an objective function (or fitness function) is needed during the optimization process, a simplified mathematical model using Artificial Neural Network (ANN) is used. Here, a polynomial objective function is established by inputting the muffler’s geometric design parameters and the related simulated Sound Transmission Loss (STL) (run on the COMSOL) via the Artificial Neural Network. Furthermore, Genetic Algorithm (GA), an optimizer, is linked to the simplified mathematical model to maximize the gun muffler’s acoustical performance. To pursue a maximal STL at the targeted tones, the geometric parameters of cone’s horizontal length (L1) and first cone’s span (L2) is optimally adjusted. Results demonstrates the STL of gun muffler at the specified frequencies of 1000, 2000, and 4000 Hz can be improved from 15.8 dB, 72.6 dB, 184.8 dB to 18.2 dB, 112.6 dB, and 416.3 dB, respectively. The paper aims to provide an optimal design method of gun muffler using Finite Element Method (FEM), Artificial Neural Network, and Genetic Algorithm. Consequently, the simulated results reveal that the optimally shaped gun muffler can efficiently depress the gun’s shooting noise.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"224 - 234"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47630751","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: 1

Optimization of sound absorbing material by using Taguchi and ANOVA 田口和方差分析法优化吸声材料

Noise and Vibration Worldwide Pub Date : 2023-03-06 DOI: 10.1177/09574565231161646

Nirmala H Bhingare, Prakash Subramaniam

{"title":"Optimization of sound absorbing material by using Taguchi and ANOVA","authors":"Nirmala H Bhingare, Prakash Subramaniam","doi":"10.1177/09574565231161646","DOIUrl":"https://doi.org/10.1177/09574565231161646","url":null,"abstract":"At present, target on eco-friendly acoustic material is decorated to diminish impact on environment due to adoption of synthetic material in acoustic application. In this paper, Taguchi method is enforced to find optimum parameters for sound absorbing coefficient of coconut fiber-based sound absorbing material. The influence of the various process parameters, i.e. Thickness, density, air gap and fiber percentage (%) on sound absorption coefficient (SAC) was studied. The settings of the parameters were determined by using Taguchi’s experimental design method. Orthogonal arrays (L25) of Taguchi, the signal-to-noise (S/N) ratio, the analysis of variance (ANOVA), and regression analyses were employed to find the optimal process parameter levels and to analyze the effect of these parameters on sound absorption coefficient values. Confirmation test with the optimal levels of parameters was carried out in order to illustrate the effectiveness of the Taguchi optimization method. Optimum parameters were found by using Taguchi method are which have 50 mm thickness, 0.0002539 g/mm3 density, 70% fiber percentage and 0 mm air gap. Also significant parameters are found which are thickness and density having p-value less than 0.05 and followed by fiber percentage and air gap. By using optimum parameters sound absorption coefficient is increased to 0.98 at frequency 2800–3500 Hz.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"162 - 171"},"PeriodicalIF":0.0,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48613431","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 state-of-the-art of practice of traffic noise regulations in Ghana 加纳交通噪音管制的最新实践

Noise and Vibration Worldwide Pub Date : 2023-03-03 DOI: 10.1177/09574565231161645

Fidelma Ibili, C. Adams, A. Adebanji, S. A. Andam-Akorful

{"title":"The state-of-the-art of practice of traffic noise regulations in Ghana","authors":"Fidelma Ibili, C. Adams, A. Adebanji, S. A. Andam-Akorful","doi":"10.1177/09574565231161645","DOIUrl":"https://doi.org/10.1177/09574565231161645","url":null,"abstract":"Noise pollution is one of Ghana’s environmental risks and it has become the norm in metropolitan areas to the point where residents in these locations experience noise nuisance and may be at risk of hearing loss. Most developed and developing countries have established traffic noise standards as a control mechanism to reduce traffic noise exposure emissions. This study aims to investigate current practices of traffic noise regulations and policy. Various agencies responsible for the control of noise pollution and the urban road sector were interviewed about traffic noise standards and practices, and it was observed that these agencies’ noise practices were based on Environmental Protection Agency (EPA) established guidelines, which did not include transportation noise regulation. Except for a Driver and Vehicle Licensing Authority (DVLA), regulation that allows a certain vehicle horning system for specific vehicle users, this study discovered that this policy is not fully implemented. A preliminary survey was conducted to collect traffic field data and inhabitants’ perceptions of traffic noise. Of the 30 respondents, 26 respondents (86.7%) affirmed that they experience traffic noise pollution at various locations, while 23 respondents (76.7%) reported various health effects due to exposure to traffic noise. This can be related to the observed noise levels which exceeded the dissatisfaction score of 5 (89 dB(A)), and also Leq value (109.1 dB(A)) was greater than the environmental permissible limit of the EPA standard of 70 dB(A). This indicates that roadside residents suffer from noise annoyance. It is recommended that transport, and environmental-related agencies work unanimously to ensure that effective control of traffic noise pollution is developed, enforced, and implemented.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"204 - 214"},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44325668","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

Evaluating the noise exposure levels of different schools in noise-scapes of Kargil town: Ladakh, India 印度拉达克卡吉尔镇不同学校噪音环境的噪音暴露水平评估

Noise and Vibration Worldwide Pub Date : 2023-03-03 DOI: 10.1177/09574565231161647

Kaneez Fatima, R. Rampal, Mohd Muslim, Khadim Hussain

{"title":"Evaluating the noise exposure levels of different schools in noise-scapes of Kargil town: Ladakh, India","authors":"Kaneez Fatima, R. Rampal, Mohd Muslim, Khadim Hussain","doi":"10.1177/09574565231161647","DOIUrl":"https://doi.org/10.1177/09574565231161647","url":null,"abstract":"Noise at school poses a serious challenge to the classroom atmosphere with negative impacts on teachers’ and students’ ability to listen and learn. Kargil town is the gateway to the Ladakh Himalayan region that remains cut from the rest of the world during the winter months. During the summer months, the region experiences a spike in traffic activity. The current study was designed to assess noise exposure levels in schools within the Kargil town administrative boundaries. The result indicates that indoor, as well as the outdoor Equivalent noise level (LAeq), in the schools located in Commercial area (58.3 ± 7.7 & 60.0 ± 1.9 dBA) Highway area (57.4 ± 8.1 & 63.0 ± 2.3 dBA) and Residential area (52.9 ± 9.8 & 60.0 ± 1.9 dBA) was above the permissible limits of World Health Organization and Central Pollution Control Board (CPCB) India. The highest indoor and outdoor Noise Climate was (15.4 ± 3.9 & 19.8 ± 2.3 dBA) in the school located on the Highway area is due to the flow of heavy vehicular traffic on the Highway and the Traffic Noise Index was also high in schools located on the Highway (97.5 ± 7.6 dBA). The Noise Pollution Level (LNP) value was also found to be high in the Highway area (72.8 ± 10.7 & 82.8 ± 3.0 dBA). The findings of this study will be beneficial for policymakers and stakeholders in the context of noise pollution management in schools with evolving noisescape of Kargil town.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"215 - 223"},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45139717","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

Forced vibration characteristics of lock gate structure 锁闸结构的强迫振动特性

Noise and Vibration Worldwide Pub Date : 2023-02-01 DOI: 10.1177/09574565231154249

D. Singh, P. Pal, S. K. Duggal

引用次数: 0

Bio_Dr. Kiran Vijayan 生物_Dr。Kiran Vijayan

Noise and Vibration Worldwide Pub Date : 2023-02-01 DOI: 10.1177/09574565231168733

引用次数: 0

Nonlinear dynamic response of bimorph piezoelectric energy harvester with functionally graded porous core 功能梯度多孔芯双晶片压电能量采集器的非线性动态响应

Noise and Vibration Worldwide Pub Date : 2023-02-01 DOI: 10.1177/09574565231156995

Narges Akbar, Madjid Soltani

引用次数: 0