Sound and Vibration最新文献_第9页

Experimental and Numerical Study of the Key Non-Dimensional Geometrical Parameters on the Noise Level of Dry-Type Cast Resin Transformers 干式铸造树脂变压器关键无量纲几何参数对噪声影响的实验与数值研究

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/sv.2019.05811

Mahdi Soltanmohammadi, Vahid Monfare

{"title":"Experimental and Numerical Study of the Key Non-Dimensional Geometrical Parameters on the Noise Level of Dry-Type Cast Resin Transformers","authors":"Mahdi Soltanmohammadi, Vahid Monfare","doi":"10.32604/sv.2019.05811","DOIUrl":"https://doi.org/10.32604/sv.2019.05811","url":null,"abstract":"Dry-Type Cast Resin Distribution Transformers (CRT) is the secondgeneration of air-cooled distribution transformers where oil is replaced by resin for electrical insulation. CRT transformers may installed indoor adjacent to or near residential areas since they are clean and safe comparing to the conventional transformers. But, as it is obvious, noise discrepancy is intrinsically accompanied with all types of transformers and is inevitable for CRT transformers too. Minimization of noise level caused by such these transformers has biological and ergonomic importance. As it is known the core of transformers is the main source of the noise generation. In this paper, experimental and numerical investigation is implemented for a large number of fabricated CRT transformers in IT Co (Iran Transfo Company) to evaluate the effective geometrical parameters of the core on the overall sound level of transformers. Noise Level of each sample is measured according to criteria of IEC60651 and is reported in units of Decibel (dB). Numerical simulation is done using noncommercial version of ANSYS Workbench software to extract first six natural frequencies and mode shapes of CRT cores which is reported in units of Hz. Three novel non-dimensional variables for geometry of the transformer core are introduced. Both experimental and numerical results show approximately similar response to these variables. Correlation between natural frequencies and noise level is evaluated statistically. Pearson factor shows that there is a robust conjunction between first two natural frequencies and noise level of CRTs. Results show that noise level decreases as the two first natural frequencies increases and vice versa, noise level increases as the two natural frequencies of the core decreases. Finally the noise level decomposed to two parts.","PeriodicalId":49496,"journal":{"name":"Sound and Vibration","volume":"204 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73023502","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

Extrapolation for Aeroengine Gas Path Faults with SVM Bases on Genetic Algorithm 基于遗传算法的航空发动机气路故障支持向量机外推

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/sv.2019.07887

Yixiong Yu

引用次数: 4

A Spring-Layer Model for a Bi-Layered Plate-Strip with Initial Stress Through Imperfect Contact Interface 非完全接触界面下具有初始应力的双层板带的弹簧层模型

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/sv.2019.04087

Ahmet Daşdemir

引用次数: 3

Comparative Study of the Propagation of Jet Noise in Static and Flow Environments 静态和流动环境下射流噪声传播的比较研究

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/SV.2019.04368

Wen Zhao, Dongxing Mao, Zaixiu Jiang

引用次数: 0

Investigation on Noise Pollution Comprehensive Treatment of Distribution Transformer in Living Area 生活区配电变压器噪声污染综合治理研究

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/sv.2019.05252

Li Li, Xiaopeng Fan, KechengWu, Zhuanglei Zou, Yongyan Zhou, Dianhai Zhang, Z. Ren, Yanli Zhang

引用次数: 0

Corrections Notice to: Evolved Algorithm and Vibration Stability for Nonlinear Disturbed Security Systems 修正通知:非线性扰动安全系统的演化算法和振动稳定性

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/sv.2019.00308

Tim Chen, W. Marriott, A. Nicholson, Mars Kmieckowiak, J. Chen

引用次数: 0

Integrated Condition Monitoring of Large Captive Power Plants and Aluminum Smelters 大型自备电厂和铝冶炼厂综合状态监测

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/sv.2019.07737

J. Mohanty, A. Adarsh, P. Dash, K. Parida, P. Pradhan

{"title":"Integrated Condition Monitoring of Large Captive Power Plants and Aluminum Smelters","authors":"J. Mohanty, A. Adarsh, P. Dash, K. Parida, P. Pradhan","doi":"10.32604/sv.2019.07737","DOIUrl":"https://doi.org/10.32604/sv.2019.07737","url":null,"abstract":"Condition monitoring is implementation of the advanced diagnostic techniques to reduce downtime and to increase the efficiency and reliability. The research is for determining the usage of advanced techniques like Vibration analysis, Oil analysis and Thermography to diagnose ensuing problems of the Plant and Machinery at an early stage and plan to take corrective and preventive actions to eliminate the forthcoming breakdown and enhancing the reliability of the system. Nowadays, the most of the industries have adopted the condition monitoring techniques as a part of support system to the basic maintenance strategies. Major condition monitoring technique they follow is Vibration Spectrum Analysis, which can detect faults at a very early stage. However implementation of other techniques like Oil analysis or Ferrography, Thermography etc. can further enhance the data interpretation as they would detect the source of abnormality at much early stage thus providing us with a longer lead time to plan and take the corrective actions. In Large Captive Power Plants and Aluminium Smelters, Integrated Condition Monitoring techniques play an important role as stoppage of primary system and its auxiliaries (boiler, steam turbine, generator, coal and ash handling plants etc.) results into the stoppage of the entire plant, which in turn leads to loss of productivity. From economical and operational point of view, it is desirable to ensure optimum level of system availability.","PeriodicalId":49496,"journal":{"name":"Sound and Vibration","volume":"26 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83154485","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: 5

Longitudinal Vibration Analysis of Elastically Coupled Nanorods System with General Boundary Supports 具有一般边界支承的弹性耦合纳米棒系统纵向振动分析

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/SV.2019.04033

Deshui Xu, J. Du, Yuhao Zhao

引用次数: 4

Leak Detection of Gas Pipelines Based on Characteristics of Acoustic Leakage and Interfering Signals 基于声泄漏特性和干扰信号的天然气管道泄漏检测

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Sound and Vibration Pub Date : 2019-01-01 DOI: 10.32604/sv.2019.03835

Lingya Meng, Cuiwei Liu, Liping Fang, Yuxing Li, Juntao Fu

引用次数: 4

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