Noise Control Engineering Journal最新文献_第8页

Sound-absorption coefficient of a pin-holder structure for sound waves incident in the direction perpendicular to the cylinder's axis 销座结构对垂直于圆柱体轴线方向入射的声波的吸声系数

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI: 10.3397/1/377012

T. Satoh, Shuichi Sakamoto, Shunsuke Unai, Takunari Isobe, Kenata Iizuka, Katsuhiko Tasaki, I. Nitta, Tetsushi Shintani

{"title":"Sound-absorption coefficient of a pin-holder structure for sound waves incident in the direction perpendicular to the cylinder's axis","authors":"T. Satoh, Shuichi Sakamoto, Shunsuke Unai, Takunari Isobe, Kenata Iizuka, Katsuhiko Tasaki, I. Nitta, Tetsushi Shintani","doi":"10.3397/1/377012","DOIUrl":"https://doi.org/10.3397/1/377012","url":null,"abstract":"In this study, the sound-absorption coefficients of a pin-holder structure consisting of a group of cylinders were estimated and compared with the experimental values for the case where sound waves are incident in the direction perpendicular to the cylinder's axis. To estimate the sound-absorption\u0000 coefficient, the gap in the pinholder structure is divided into elements and approximated as being between two parallel planes, taking the exact shape of the divided elements into account. The characteristic impedance and propagation constant of the approximated clearances were calculated\u0000 and treated as a one-dimensional transfer matrix. The transfer matrices for each element were used to calculate the sound-absorption coefficient. The calculated theoretical values were compared with the experimental ones. In the experiment, the samples were fabricated using a 3D printer, and\u0000 the sound-absorption coefficient was measured using a two-microphone impedance-measurement tube. Although the experimental and theoretical values differed, they showed similar trends. We also found that the prediction error in the practical sound-absorption coefficient could be reduced by\u0000 adjusting the diameter of the pins used in the calculation.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45870101","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: 1

Dynamic modeling of central bevel gear transmission system in aero-engine 航空发动机中心锥齿轮传动系统动力学建模

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-01-01 DOI: 10.3397/1/37704

Jia-You Liu, Hao Zhang, Jing-yu Zhai, Qingkai Han

{"title":"Dynamic modeling of central bevel gear transmission system in aero-engine","authors":"Jia-You Liu, Hao Zhang, Jing-yu Zhai, Qingkai Han","doi":"10.3397/1/37704","DOIUrl":"https://doi.org/10.3397/1/37704","url":null,"abstract":"Aero-engine is the most critical part of an aircraft. As its key component, the central bevel gear transmission system is always designed only considering the meshing vibration and ignoring structural characteristics of shafts and bearings, and comprehensive vibration characteristics\u0000 is not well addressed. The transmission system may suffer severe vibration. To accurately study the dynamic characteristics of the system, a model of a central bevel gear transmission system is developed considering the effects of bevel gear mesh stiffness, shaft stiffness, bearing stiffness,\u0000 and unbalance excitation in this paper. It has been validated by finite element software ANSYS. On this basis, the influence of variation of bearing stiffness and mesh stiffness on the natural characteristics of the central bevel gear transmission system is investigated. The influence of unbalance\u0000 on the radial vibration and gear meshing force is studied by the analytical calculation method. A case study is carried out. The results show that variation of stiffness within a certain range will cause dramatic changes in the natural characteristics of the system. The unbalance of the driven\u0000 bevel gear shaft has an effect on the radial vibration and meshing force of the system. The proposed model can reflect radial vibration characteristics, axial vibration characteristics, torsional vibration characteristics, and some coupled natural characteristics of the system. This research\u0000 provides a theoretical basis to optimize dynamic performance and reduce the vibration of the system and will be helpful in designing the central bevel gear transmission system.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43531045","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

Power transformer excitation force estimation for load noise reduction using experimental apparatus based on beamforming theory 基于波束形成理论的负荷降噪实验装置电力变压器励磁力估计

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-01-01 DOI: 10.3397/1/37706

Yo-Seb Choi, Suk-Yoon Hong, Jee-hun Song, H. Kwon, J. Kang

{"title":"Power transformer excitation force estimation for load noise reduction using experimental apparatus based on beamforming theory","authors":"Yo-Seb Choi, Suk-Yoon Hong, Jee-hun Song, H. Kwon, J. Kang","doi":"10.3397/1/37706","DOIUrl":"https://doi.org/10.3397/1/37706","url":null,"abstract":"To comply with noise regulations in residential areas, low-noise electrical transformers must be developed. However, it is difficult to accurately reflect the frequency characteristics of the transformer, which have a large influence on the noise produced, because the high voltage and\u0000 current make it impossible to experimentally measure the internal excitation forces involved. In this paper, we propose a new method using an experimental apparatus for estimating the internal excitation forces experienced by transformers whose results accurately reflect the actual frequency\u0000 characteristics of the transformer. To estimate the excitation force, the pressure distribution data outside the enclosure of a transformer was experimentally measured by the experimental apparatus based on a beamforming method, and the transfer function from the excitation source to the noise\u0000 radiation was derived numerically. The excitation force was then derived using the pressure distribution data and transfer function. Based on the estimated excitation force, the contribution of each vibration transmission path was derived using transfer path analysis with integrated transfer\u0000 function matrix as a basis for creating an effective noise reduction plan. The noise reduction plan based on our method was able to reduce transformer noise sufficiently to meet the noise standard set in standard transformer export contracts.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41987476","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

Integrated design of passive control methods for mitigating vibration and noise of rails in high-speed railway 高速铁路钢轨减振降噪被动控制方法的集成设计

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-01-01 DOI: 10.3397/1/37707

Rixin Cui

{"title":"Integrated design of passive control methods for mitigating vibration and noise of rails in high-speed railway","authors":"Rixin Cui","doi":"10.3397/1/37707","DOIUrl":"https://doi.org/10.3397/1/37707","url":null,"abstract":"Attachment of constrained layer dampers and dynamic vibration absorbers (DVAs) on rails are two effective passive control methods used for mitigating vibration and noise of railways at the source. An integrated passive control method in which constrained layer dampers and DVAs were\u0000 simultaneously attached on the rail was proposed to attenuate the vibration and noise of the rail in a broad frequency range and to suppress the maximum vibration emitted by the first pinned-pinned resonance of the rail. The design method for the integrated application was developed based\u0000 on the optimum design theory of DVA for multiple-degree-of-freedom damping structures. The vibration and noise reduction properties of the integrated control method were analyzed using a vibroacoustic model established based on the sequential finite element method–boundary element method\u0000 and evaluated through laboratory tests. The results show that the integrated control method fully demonstrates the advantages of the two passive vibration control methods, which can improve the longitudinal transmission loss of the rail by 5.3 dB/m at the first pinned-pinned resonant frequency\u0000 and reduce the maximum acoustic power of the rail by 7.8 dB(A) as well as achieve an overall rail noise reduction of 4.0 dB(A) within 3000 Hz. The vibration and noise reduction properties of the integrated control method are improved as the mass ratio increases in the frequency range above\u0000 600 Hz. The test results show that the integrated control method decreases the rail web vibration and rail noise by more than 40%.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47818847","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

Case study: Numerical study of the noise reduction characteristics of corrugated perforated pipe mufflers 案例研究:波纹孔管消声器降噪特性的数值研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-01-01 DOI: 10.3397/1/37702

Z. Hou, Tanghong Xu, Zhijun Zhang, Jiyu Sun

{"title":"Case study: Numerical study of the noise reduction characteristics of corrugated perforated pipe mufflers","authors":"Z. Hou, Tanghong Xu, Zhijun Zhang, Jiyu Sun","doi":"10.3397/1/37702","DOIUrl":"https://doi.org/10.3397/1/37702","url":null,"abstract":"Resistant mufflers are commonly used in the wide band noise control of the exhaust of tractor internal combustion engines due to their simple structure, broadband frequency performance and long service life. In this paper, a corrugated perforated pipe muffler was proposed based on an\u0000 improved design of a straight-through perforated pipe muffler to reduce the exhaust noise of internal combustion engines. The acoustic attenuation performance of the corrugated perforated tube muffler under the action of nonuniform flow and a temperature gradient was predicted by using the\u0000 one-way flow-acoustic coupling method, which combines computational fluid dynamics and the acoustic finite element method. The pressure loss and self-noise of the corrugated perforated tube muffler were compared with those of the straight-through perforated tube muffler. The influence of the\u0000 structural parameters of the corrugated perforated tube mufflers on the transmission loss was analyzed. The significance level of the perforation diameter, peak height, distance between adjacent peaks, and peak width on the transmission loss of the corrugated perforated tube muffler was studied\u0000 by multiple linear regression analysis.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47416012","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: 1

Case study: Mitigation of the road noise of a passenger vehicle by determination of critical paths via transfer path analysis 案例研究:通过转移路径分析确定关键路径以减轻乘用车的道路噪音

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-01-01 DOI: 10.3397/1/37701

M. Yıldız, Aytekin Özkan, Halil Ateş, Ahmet Ayvaz, Traki Küçük

引用次数: 0

Segmented ROSI method: Beamforming method for investigating turbomachinery noise sources along segmented trajectories 分段ROSI方法:沿分段轨迹研究涡轮机械噪声源的波束形成方法

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-01-01 DOI: 10.3397/1/37705

Haitian Zhang, Bálint Kocsis, Csaba Horváth

{"title":"Segmented ROSI method: Beamforming method for investigating turbomachinery noise sources along segmented trajectories","authors":"Haitian Zhang, Bálint Kocsis, Csaba Horváth","doi":"10.3397/1/37705","DOIUrl":"https://doi.org/10.3397/1/37705","url":null,"abstract":"The rotating source identifier (ROSI) beamforming method is a method designed for localizing rotating noise sources in a uniform flow based on out-of-flow acoustic pressure field measurement data. It has been developed for sources moving along a circular trajectory, such as turbomachinery\u0000 blades. The original ROSI method processes the measured acoustic signals over a long time segment to reconstruct the noise sources, providing time-averaged results for each noise source. By doing so, it does not take into consideration certain features of the noise sources, such as the directivity\u0000 of the trailing edge and leading-edge noise sources. A further development of the ROSI method is presented herein, which separates the sound-pressure signal of one revolution into multiple segments. In this way, the beamforming maps can provide one with a better understanding of the differences\u0000 between the noise sources as a function of angular position. This method will be referred to herein as the segmented ROSI method. The goal of this further development is to improve the capability of the method in identifying the position-dependent modulations of the various noise sources as\u0000 they are moving along their trajectories, rotating around the axis. The investigation presents the theory behind the new segmented ROSI method along with simulation and measurement-based test cases which help in comparing the new method to the original ROSI method. The results show that the\u0000 novel method provides a strong tool for investigating turbomachinery noise sources that vary along segments of their trajectories. It is therefore expected that the tool will be useful in cases that look at turbomachinery from an angle and cases where the loading of the blades changes as a\u0000 function of angular position.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42767168","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

On the acoustic radiation of all edges free rectangular thin plate 关于声辐射的所有边自由矩形薄板

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-01-01 DOI: 10.3397/1/37703

F. Ertürk, H. Erol

引用次数: 0

Noise exposure and its impact on psychological health of agricultural tractor operators 噪声暴露及其对农用拖拉机驾驶员心理健康的影响

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-11-01 DOI: 10.3397/1/376947

M. Yamin, Z. Yousaf, Khalid Mahmood Bhatt, Muhammad Ibrahim

{"title":"Noise exposure and its impact on psychological health of agricultural tractor operators","authors":"M. Yamin, Z. Yousaf, Khalid Mahmood Bhatt, Muhammad Ibrahim","doi":"10.3397/1/376947","DOIUrl":"https://doi.org/10.3397/1/376947","url":null,"abstract":"Constant exposure of noise to the auditory system of the agricultural tractor opera- tor can cause physical and psychological problems. A field study was conducted in the Faisalabad and Narowal districts of Pakistan to examine the spread of tractor noise and its psychological effects\u0000 on the safety of tractor operators driving tractors without cabins and other noise reduction measures. Four of the most common imple- ments used in Pakistan, including land scraper, cultivator, disk harrow and seed drill, were used to detect the changes in tractor noise at two speeds of 5.3\u0000 km/h and 10.6 km/h in all four directions. Lowest noise was produced during the field operation of the seed drill at a mean noise value of 81.9 dB(A) among all four implements. Disk harrow and cultivator were found to be the most noisy implement, and during oper- ation, the tractor operator\u0000 was directly exposed to high noise levels of 86.9 dB(A) and 84.9 dB(A), respectively. This noise pollution caused psychological problems in agri- cultural tractor operators, as demonstrated by the highly positive correlations of de- pression, aggression, anxiety and stress. This trend had\u0000 a negative effect on their social interactions relative to the comparable population of office employees. In or- der to mitigate the adverse health effects, tractor operators must be equipped with sound proof cabins or at least ear plugs because of direct exposure to high noise levels. Furthermore,\u0000 a safe distance of 48 m or at least a warning distance of 26 m from the tractor must be maintained by farm workers.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42252695","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: 1

Prediction and analysis of sound field in long enclosures with a modal-based method 基于模态的长围挡声场预测与分析

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2021-11-01 DOI: 10.3397/1/376949

C. Jiang, Xiang Liu, Stephany Y. Xu, Shangyu Zhang

引用次数: 0