Noise Control Engineering Journal最新文献_第6页

Development of direct acoustic energy flow analysis (DAEFA) for ship cabin noise in the medium-to-high frequency range 中高频舱噪声直接声学能量流分析（DAEFA）的发展

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-07-01 DOI: 10.3397/1/377027

Tae-Gyoung Kim, Suk-Yoon Hong, Jee-hun Song, H. Kwon, Sung-Hooin Kim

{"title":"Development of direct acoustic energy flow analysis (DAEFA) for ship cabin noise in the medium-to-high frequency range","authors":"Tae-Gyoung Kim, Suk-Yoon Hong, Jee-hun Song, H. Kwon, Sung-Hooin Kim","doi":"10.3397/1/377027","DOIUrl":"https://doi.org/10.3397/1/377027","url":null,"abstract":"Noise analysis from heating, ventilation and air conditioning (HVAC) elements in ship cabins is needed to satisfy the strict noise regulation for the ship cabin, and it is very important for their effects to be evaluated in the early stage of design. In this paper, a direct acoustic\u0000 energy flow analysis (DAEFA) model is presented for the noise analysis of the ship cabin to reflect direct fields of the sources from an HVAC element. Total acoustic fields are considered by deriving the fundamental solution of the energy flow model for direct and reverberant fields in a closed\u0000 space. Sound propagation in the direct field is implemented using the geometrical acoustics concept, and noise sources introduced into the reverberant sound fields are considered by using the relationship between direct fields and the closed space boundaries. For cabin noise analysis using\u0000 DAEFA, interior boundaries of the cabin are discretized, and boundary integral formulations for each field are integrated. Noise analysis is performed for various cases with the DAEFA model to minimize cabin noise. The optimal design derived through the analysis was applied to an actual ship,\u0000 and cabin noise measurement was conducted onboard the applied ship. Comparison of the analysis and measurement results confirms the effectiveness of the proposed design.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47719396","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: Analysis of acoustic-structure coupling noise characteristics of the exhaust muffler of an internal combustion engine 案例研究:内燃机排气消声器的声-结构耦合噪声特性分析

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-07-01 DOI: 10.3397/1/377028

Z. Hou, Tengfei Si, Shiqiang Zhang, Zhijun Zhang, Jiyu Sun

{"title":"Case study: Analysis of acoustic-structure coupling noise characteristics of the exhaust muffler of an internal combustion engine","authors":"Z. Hou, Tengfei Si, Shiqiang Zhang, Zhijun Zhang, Jiyu Sun","doi":"10.3397/1/377028","DOIUrl":"https://doi.org/10.3397/1/377028","url":null,"abstract":"Exhaust noise produced by internal combustion engines is one of the main problems of vehicle noise, and exhaust mufflers can significantly improve this problem. In fact, the sound waves inside the exhaust muffler will cause the muffler shell to vibrate, causing the muffler to produce\u0000 shell radiation noise. Therefore, it is necessary to carry out the acoustic-structure coupling analysis of the muffler. This paper improved the design of a prototype straight-through perforated pipe-resistant muffler (design A) and designed a straight-through perforated pipe-resistant muffler\u0000 with a corrugated lining (design B). Structural modal analysis, acoustic modal analysis, and transmission loss analysis of the two mufflers were carried out. The coupling of the acoustic cavity and structure was considered, and the radiation noise of two kinds of resistant mufflers was comparatively\u0000 analyzed by the direct-boundary-element method. The acoustic radiation of two kinds of resistant mufflers was studied. The pressure loss of the two kinds of mufflers was studied by aerodynamic analysis. The results suggested that the design B muffler effectively improved the noise reduction\u0000 performance of the prototype muffler, reduced the vibration displacement amplitude of the shell, and reduced the sound power level of the design A muffler.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45856855","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

Research on pipeline state recognition method based on acoustic signal frame PCA 基于声信号帧PCA的管道状态识别方法研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-07-01 DOI: 10.3397/1/377029

Fengfeng Bie, Yue Guo, Sheng Gu, Gang Yang, Mingjun Pang

引用次数: 0

Theoretical and experimental investigations for noise reduction of clearance joints in vertical vibrations 垂直振动间隙接头降噪的理论与实验研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-07-01 DOI: 10.3397/1/377026

Milad Sadri, M. Forouzan

{"title":"Theoretical and experimental investigations for noise reduction of clearance joints in vertical vibrations","authors":"Milad Sadri, M. Forouzan","doi":"10.3397/1/377026","DOIUrl":"https://doi.org/10.3397/1/377026","url":null,"abstract":"Simple revolving clearance pin and bush joint is standard and is widely used in machines and mechanisms. Clearance is necessary for rotational mobility of the joint parts, but it may lead to contact loss, which produces noise. To avoid the contact loss, it is necessary to ensure equality\u0000 between the accelerations of the driver and the driven parts of the joint. In the case of a driver pin inside a bush as a free-driven part of the clearance joint, the acceleration of the bush in the vertical direction is limited to gravity. Therefore, if the exciting pin vibrates with downward\u0000 acceleration more than the gravity, the contact loss will occur. As a solution, the acceleration of the free part was increased by a symmetric set of springs and a wire. To predict the contact condition, a set of dynamic equilibrium equations was developed and used to obtain the minimum spring\u0000 stiffness and preload. Simulation and experimental results verified the concept of the contact loss and proved the effectiveness of using proper spring on noise reduction. Theoretical results show that with a sufficient spring preload, it is possible to use an arbitrary stiffness down to a\u0000 limit even at relatively large accelerations. According to the acoustic tests, the noise picks were attenuated considerably, and the noise level was reduced to the background noise level after using proper springs.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44668054","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

Acoustic performance of cavities with gradient changes of cavity numbers under low lattice constant in a soft elastic medium 软弹性介质中低晶格常数下腔数梯度变化的声学性能

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377023

Shi-long Wang, Bo Hu, Song Li, Lanyue Zhang, Jie Shi

{"title":"Acoustic performance of cavities with gradient changes of cavity numbers under low lattice constant in a soft elastic medium","authors":"Shi-long Wang, Bo Hu, Song Li, Lanyue Zhang, Jie Shi","doi":"10.3397/1/377023","DOIUrl":"https://doi.org/10.3397/1/377023","url":null,"abstract":"Air cavities with particular arrangements embedded in elastic layers are generally used as anechoic coatings. In this paper, an idea of cavity numbers with gradient changes is introduced in a soft elastic medium that comprises periodical cylindrical cavities to enhance the low-frequency\u0000 absorption capacity effectively. The presented model provides a sound absorption coefficient that is higher than 0.5 in the frequency ranges of 75 to 95 Hz and 380 to 720 Hz. Thus, validating the idea can effectively enhance the low-frequency absorption capacity compared with those in previous\u0000 literature. Analytical results based on effective medium approximation theory are compared with those obtained numerically using the finite element method. These results indicate that the invalidity of the analytical model is due to the coupling between cavities under low lattice constant.\u0000 Power density dissipation and displacement vectors are plotted to study sound absorption mechanism, thereby showing that the dissipated energy is mainly resulted from the multiple-scattering effect. The scattering between cavities induces the transverse wave caused by the wave mode conversion\u0000 dissipates in the elastic medium and results in sound absorption. Simulation results show that the absorption peaks can be effectively manipulated by tuning the gradient profile of the cavity numbers. The proposed model is then verified by the corresponding experiment. Results obtained numerically\u0000 and experimentally are agreed well, and its feasibility is verified. The presented model would offer a new approach for the metamaterial design on low-frequency broadband sound absorption and could have potential applications on the design of anechoic coatings.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46286840","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: Knowledge, attitude, and practice (KAP) regarding hearing protection: A case study among offset printing industry workers in Tehran province 案例研究：关于听力保护的知识、态度和实践（KAP）：德黑兰省胶印行业工人的案例研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377021

S. Vosoughi, I. Alimohammadi, A. Hosseini, Zhaleh Sedghi Noushabadi

引用次数: 0

Difference in the perceived loudness of sound between Chinese men and women 中国男性和女性感知声音响度的差异

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377022

Mariko Tsuruta-Hammaura, G. Wang, Manami Aono, S. Iwamiya

{"title":"Difference in the perceived loudness of sound between Chinese men and women","authors":"Mariko Tsuruta-Hammaura, G. Wang, Manami Aono, S. Iwamiya","doi":"10.3397/1/377022","DOIUrl":"https://doi.org/10.3397/1/377022","url":null,"abstract":"Gender differences in perceived loudness have been observed between Japanese men and women in previous studies. Female participants tended to assign higher loudness scores to sounds of the same sound pressure level than did male participants. However, this difference was not clearly\u0000 observed when using a ratio scale for the evaluation of loudness, such as in a magnitude estimation. To discuss factors affecting gender differences in perceived loudness, the same rating experiments used in previous studies were conducted with Chinese men and women. A rating experiment using\u0000 a verbal interval scale showed that Chinese women tended to rate the same sounds as louder than did Chinese men. The gender effect was replicated in an experiment using an adjustment method that measured the limits of the sound pressure level perceived as soft or loud; women selected lower\u0000 levels than did men for the highest limit of soft sounds and the lowest limit of loud sounds. These tendencies were the same as those of Japanese men and women observed in previous studies. Rating experiments adopting the methods of magnitude estimation and magnitude production for the ratio\u0000 scales showed that the power exponent a in Stevens' power law was larger for female participants than for male participants under some conditions. However, the observed gender difference in the power exponent a for Chinese was not consistent, while it was not clear for Japanese. The gender\u0000 difference in criteria for verbally categorizing loudness may be responsible for the gender difference in perceived loudness.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44428324","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

Study on the acoustic performance of a coupled muffler for diesel engine 柴油机耦合消声器的声学性能研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377018

Jing Xue, Yongan Zhang, He Su, Pei Wu

{"title":"Study on the acoustic performance of a coupled muffler for diesel engine","authors":"Jing Xue, Yongan Zhang, He Su, Pei Wu","doi":"10.3397/1/377018","DOIUrl":"https://doi.org/10.3397/1/377018","url":null,"abstract":"A new type of coupled muffler for diesel engine was proposed based on the principle of split-stream rushing and multi-unit coupling theory, and a coupling study of noise attenuation performance was carried out. The one-dimensional transfer matrix method was used to establish a transfer\u0000 matrix mathematical model of the new muffler. The relative importance of the impact on the transmission loss for the coupled muffler was then able to be ranked by experimental design and MATLAB software calculation. From this, the combination of parameters with the optimal transmission loss\u0000 was obtained. The transmission loss tests without airflow and the insertion loss tests with airflow between the optimal model of the coupled muffler and the original muffler supplied with the engine were verified respectively. The tests of pressure loss between the coupled muffler and the\u0000 original muffler were also completed. The results show that the transmission losses of the coupled muffler in 0–2000 Hz and 0–200 Hz without airflow were 6 dB and 8 dB higher than that of the original muffler, the insertion losses of the coupled muffler in 0–2000 Hz and 0–200\u0000 Hz with airflow are 6 dB and 7 dB higher than that of the original muffler, and the noise peaks in the source spectrum are well controlled by the coupled muffler. The pressure losses of the coupled muffler are lower than that of the original muffler, which verifies that the coupling structure\u0000 could reduce the airflow velocity in the muffler to improve noise attenuation performance and aerodynamic performance of the muffler at the same time.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43856441","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

Uncertainty of in situ low frequency reverberation time measurements from 20 Hz – An empirical study; Part II: Impulse response method 20 Hz低频混响时间原位测量的不确定度——实证研究第二部分:脉冲响应法

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377024

Fredrik Ljunggren, C. Simmons, M. Pettersson

引用次数: 1

Pass-by noise prediction of motor vehicles using gradient boosted models and physical calculations of longitudinal driving dynamics 基于梯度增强模型和纵向驾驶动力学物理计算的机动车通过噪声预测

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377019

F. Knappe, J. Rosskopf

{"title":"Pass-by noise prediction of motor vehicles using gradient boosted models and physical calculations of longitudinal driving dynamics","authors":"F. Knappe, J. Rosskopf","doi":"10.3397/1/377019","DOIUrl":"https://doi.org/10.3397/1/377019","url":null,"abstract":"In the prior decades, automotive manufacturers have steadily improved the vibroacoustics performance of their products. This process is highly influenced by the continuously rising requirements on regulations of noise emissions of motor vehicles, also known as pass-by noise. The legal\u0000 requirements, demanding the reduction of the exterior noise emissions of motor vehicles, are caused by the impact of noise on human health. The latest legal norm of the Economic Commission for Europe (ECE) is the ECE R51.03 test, including continuous reductions of the allowed pass-by noise\u0000 sound pressure level of motor vehicles. Additionally, the need for faster development cycles results in more intensive use of digital models to predict the expected physical behavior of future products. These models extend the so-called digital twin, which has gained a high importance in automotive\u0000 manufacturing. Acoustic state-of-the-art simulation and analysis methods fail at the complexity of the over-all pass-by noise, consisting of multiple partial sound sources. These multiple sources are partly correlated, resulting in the absence of trivial deconvolution methods. This paper presents\u0000 a digital representation of motor vehicles regarding their noise emissions by using machine learning techniques combined with physical calculations of longitudinal driving dynamics. Gradient boosted models are used to predict the exterior sound pressure levels of motor vehicles. The developed\u0000 algorithm permits the possibility to predict the expected pass-by noise of future cars in early stages of the digital development process. This allows original equipment manufacturers to detect necessary changes to concepts and construction models of future cars. The prediction results are\u0000 validated for three engines.","PeriodicalId":49748,"journal":{"name":"Noise Control Engineering Journal","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46077140","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