Noise and Vibration Worldwide最新文献_第3页

Status and noise reduction analysis of robotics lab in an academic institute by using acoustic materials 某学术机构机器人实验室声学材料降噪现状及分析

Noise and Vibration Worldwide Pub Date : 2023-07-28 DOI: 10.1177/09574565231193052

Charanjeet Singh, S. Deswal

{"title":"Status and noise reduction analysis of robotics lab in an academic institute by using acoustic materials","authors":"Charanjeet Singh, S. Deswal","doi":"10.1177/09574565231193052","DOIUrl":"https://doi.org/10.1177/09574565231193052","url":null,"abstract":"In recent decades, noise has emerged as one of the most annoying and tiring factors in working environments, be it in factory, workshop, academic or research setup. This paper presents the noise status and noise reduction analysis of Robotics lab in an academic institute. The average equivalent continuous noise level ( L A e q ) inside the Robotics lab (64.90–75.99 dB) was within or close to permissible limits of 75 dB as per Indian standards for industrial environment; but the operation of Mig and Spot welding were a source of noise nuisance to the adjoining academic area due to the sound transmission from the Robotics lab. The noise reduction analysis in the study demonstrated the usage of acoustics (glass, curtain, cardboard and thermocol) in windows as sound barriers that dampens the transmission of indoor noise. The Sound Transmission Loss (STL) was observed to be highest in the range of 18.12–22.62 dB (28.88–29.59%) by using the combination of glass and curtain as acoustic barrier in windows of the Robotics lab; thereby, reducing noise nuisance significantly in the academic area. The study revealed the necessity of effective acoustic barrier in labs/workshops under-industrial conditions in academic institutes and proposed a model for predicting STL for the combination of glass and curtain from L A e q value.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"469 - 476"},"PeriodicalIF":0.0,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48626336","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 on improving electric bus interior sound quality based on sensitivity analysis of psycho-acoustics parameters 基于心理声学参数灵敏度分析的电动客车车内音质改善案例研究

Noise and Vibration Worldwide Pub Date : 2023-07-27 DOI: 10.1177/09574565231193050

E. Zhang, Zhilong Peng, Jianming Zhuo

引用次数: 0

Biography of guest editor, Dr. Prasun Jana 客座编辑Prasun Jana博士的传记

Noise and Vibration Worldwide Pub Date : 2023-07-01 DOI: 10.1177/09574565231189911

引用次数: 0

Flügge shell theory and solution for the vibration analysis of a thin elastic cylindrical panel of varying curvature 变曲率弹性圆柱薄板振动分析的Flügge壳理论与解法

Noise and Vibration Worldwide Pub Date : 2023-07-01 DOI: 10.1177/09574565231179951

A. Badry, Ahmed Safwat, Mousa Khalifa

{"title":"Flügge shell theory and solution for the vibration analysis of a thin elastic cylindrical panel of varying curvature","authors":"A. Badry, Ahmed Safwat, Mousa Khalifa","doi":"10.1177/09574565231179951","DOIUrl":"https://doi.org/10.1177/09574565231179951","url":null,"abstract":"In this paper, the free vibration behavior of isotropic and orthotropic cylindrical shell panels with variable curvature subjected to certain ends boundary conditions is analyzed by the transfer matrix technique and solved by the Romberg integration approach. Flügge’s shell theory is employed to model the governing three-dimensional equations of vibration and Fourier’s approach is used to deform the displacement fields as trigonometric functions in the longitudinal direction. As a result of a semi-analytical procedure is conducted, the coupled governing equations of panel problem can be written in a matrix partial differential equation of first order with variable coefficients and reduced from the two-dimensional problem to one-dimensional one which is solved numerically as an initial-value problem. The proposed model is applied to get the natural frequencies and mode shapes for the vibration behavior of two-side simply-supported cylindrical panels with simply-supported, free-free, clamped-free and clamped-clamped ends boundary conditions lying at their curved edges. The sensitivity of the vibration behavior to the variety of curvature, panel parameters and material orthotropy of shell is studied.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"337 - 349"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42348098","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

Biography of guest editor, Dr. S. Narayanan 客座编辑S. Narayanan博士传记

Noise and Vibration Worldwide Pub Date : 2023-07-01 DOI: 10.1177/09574565231189921

Dr. S. Narayanan

引用次数: 0

Efficiency of the SCI-QZS combined with the CCI in improving ride quality of soil compactors SCI-QZS与CCI结合改善土壤压实机平顺性的效果

Noise and Vibration Worldwide Pub Date : 2023-06-27 DOI: 10.1177/09574565231179949

Shaoyong Xu, V. Nguyen, Tianfeng Ye

{"title":"Efficiency of the SCI-QZS combined with the CCI in improving ride quality of soil compactors","authors":"Shaoyong Xu, V. Nguyen, Tianfeng Ye","doi":"10.1177/09574565231179949","DOIUrl":"https://doi.org/10.1177/09574565231179949","url":null,"abstract":"To decrease the operator’s seat vibration and control the cab’s shaking of the soil compactor, the seat’s control isolation (SCI) added by the QZS structure (SCI-QZS) and the cab’s control isolations (CCI) combined are proposed and investigated. A three-dimensional dynamic model of the soil compactor under the interaction of the tire and drum on the deformable terrain is established to calculate the vibration equation of the soil compactor. The vehicle’s experimental study with the seat’s isolation added by the QZS structure is also given to verify the mathematical model and study result. The isolation efficiency and stability of the SCI-QZS and CCI combined are evaluated based on the root mean square accelerations of the operator’s seat (aws) and cab’s pitching angle (a wφc ) under the various conditions of the soil compactor. The research shows that with the isolation systems of the soil compactor seat and cab without the QZS structure and control, the operator’s ride comfort and the cab’s shaking are strongly affected under various operating conditions. With the soil compactor using the SCI-QZS and CCI combined, both the operator’s ride comfort and the cab’s shaking are greatly reduced under all the various operating conditions. Especially, the aws and a wφc are remarkably reduced by 67.8% and 59.8% in comparison with the isolation systems of the soil compactor seat and cab without the QZS structure and control. Therefore, the SCI-QZS and CCI combined should be applied on the soil compactor to improve the operator’s ride comfort and control the cab’s shaking of the soil compactors or other off-road vehicles.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"378 - 388"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46344717","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

Impact evaluation of different network planning concepts on traffic noise 不同路网规划理念对交通噪声的影响评价

Noise and Vibration Worldwide Pub Date : 2023-06-26 DOI: 10.1177/09574565231179944

Minmin Yuan, Zhi-Win Wu, Haibo Wang, Jincai Chen

引用次数: 0

Self-shrouded torsional blade model equivalence and blade vibration response analysis 自罩扭转叶片模型等效及叶片振动响应分析

Noise and Vibration Worldwide Pub Date : 2023-06-04 DOI: 10.1177/09574565231179952

Qinglei Zhang, Liuchang Wang, Jianguo Duan, Jiyun Qin, Ying Zhou

{"title":"Self-shrouded torsional blade model equivalence and blade vibration response analysis","authors":"Qinglei Zhang, Liuchang Wang, Jianguo Duan, Jiyun Qin, Ying Zhou","doi":"10.1177/09574565231179952","DOIUrl":"https://doi.org/10.1177/09574565231179952","url":null,"abstract":"In steam turbines, the operation of turbine blades can lead to vibrations, which may result in turbine accidents. Traditional calculation methods are difficult to use due to the complex structure of the torsional blade, and simulation analysis can be time-consuming. Therefore, it is necessary to use the equivalent model instead. Most of the previous studies have simplified the straight blade to a cantilever beam model without considering the shear effect, and used harmonic response analysis to study the vibration of the blade for simulation. The blade body of the torsional blade can be regarded as a torsional variable section beam, and the Timoshenko beam model is the same as the variable section beam. Therefore, the Timoshenko beam model can be regarded as the equivalent of the sheathed torsional blade. Considering the complexity of the calculation of the self-shrouded torsional blade model. According to the theory of Timoshenko beam, the model of the shrouded blade of Timoshenko beam with different torsion angles was established. The first sixth-order modes of the blade model and the vibration response of the adjacent blades under forced vibration are compared, respectively. The results show that the results obtained from the Timoshenko beam blade model considering the torsion angle are closer to the torsional blade model. In addition, the blade vibration response of the same model under different excitation force amplitudes was further compared, and the results showed that the vibration amplitude, acceleration and velocity of the shrouded blade increased with the increase of the excitation force amplitude. However, the magnitude of the inter-shroud collision force and the number of collisions between adjacent blade shrouds are non-linearly related to the amplitude of the excitation force.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"311 - 324"},"PeriodicalIF":0.0,"publicationDate":"2023-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42225642","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

Parameters optimization of grounded dynamic vibration absorber with pendulum connected via the lever mechanism 杠杆机构连接摆式接地动力吸振器参数优化

Noise and Vibration Worldwide Pub Date : 2023-06-01 DOI: 10.1177/09574565231179729

Marcial Baduidana, A. Kenfack-Jiotsa

{"title":"Parameters optimization of grounded dynamic vibration absorber with pendulum connected via the lever mechanism","authors":"Marcial Baduidana, A. Kenfack-Jiotsa","doi":"10.1177/09574565231179729","DOIUrl":"https://doi.org/10.1177/09574565231179729","url":null,"abstract":"This paper investigates the control performance of grounded dynamic vibration absorber (DVA) with pendulum connected via the lever mechanism. These optimal parameters are found based on the extended fixed point theory. However, in the optimal equivalent stiffness derivation process, it was found that the amplified mass ratio could only take limited values to guarantee the stability condition of the coupled system and make positive equivalent stiffness. As a result, the best working range of the amplified mass ratio was established. The results analysis of the influence of system parameters on the primary system response shown that the amplified mass ratio has greatly vibration reduction effect, which push the peak resonant vibration of the primary system smaller than its static response without control. To better understand the control performance of the proposed DVA, three other dynamic vibration absorbers with or without negative stiffness are considered. The control performance comparison show that under harmonic excitation or even random excitation of the primary system, the proposed DVA model has a significant vibration reduction effect compared to the considered its DVA counterparts. The interest of these relevant results can be used in the field of vibration control engineering.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"297 - 306"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"65271359","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 assessment of soundscape quality in historic urban parks: A case study of El-Goli Park of Tabriz, Iran 历史城市公园声景观质量评价——以伊朗大不里士El-Goli公园为例

Noise and Vibration Worldwide Pub Date : 2023-06-01 DOI: 10.1177/09574565231179733

Negar Mohammadzadeh, R. Mohammadzadeh

{"title":"The assessment of soundscape quality in historic urban parks: A case study of El-Goli Park of Tabriz, Iran","authors":"Negar Mohammadzadeh, R. Mohammadzadeh","doi":"10.1177/09574565231179733","DOIUrl":"https://doi.org/10.1177/09574565231179733","url":null,"abstract":"The preservation of historic sites requires a multisensory approach, in which sound plays an important role. A good acoustic environment could contribute to the aesthetic, ecological, and cultural improvement of historic sites, as well as increase visitor attendance with their surroundings. Due to the unique spatial qualities and social-cultural distinctions of these locations, it seems essential to consider the inherent differences in their soundscapes. The hypothesis of this study is to assess the interrelationships between soundscape evaluations and environmental indicators including visual quality and overall impression as well as the related semantic attributes. The historic El-Goli Park of Tabriz, which is in a semi-natural environment, was evaluated as the field study. Field measurements at sampled locations were conducted to record sound pressure levels (SPL) to generate sound maps. At the same time, a questionnaire survey was used for the subjective assessment of soundscape quality. The main results are as follows: 1. Natural sounds (birds and water) and human sounds (voices and footsteps) are the sounds primarily perceived as dominant and pleasant. 2. For a selected location, the higher the percentage of visitors reporting a pleasant sound (mainly natural sounds), the higher the reported soundscape quality, visual quality, and overall impression. 3. Among the social/demographic/behavioral factors considered, “age” and “time period during a day of visit” were associated with soundscape perception. These results may be helpful for the soundscape of historic city parks and will offer helpful insights into landscape policy and regional acoustic environment planning.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"54 1","pages":"248 - 260"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41784072","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