Noise Control Engineering Journal最新文献_第7页

Case study: Effect of asymmetry of vibration on the perceived illusion force 案例研究：振动的不对称性对感知错觉力的影响

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377020

T. Asakura, H. Hirasawa

引用次数: 0

Case study: Simulating and measuring the vibration and radiated sound of a large industrial chiller 案例研究：模拟和测量大型工业冷水机组的振动和辐射声

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-05-01 DOI: 10.3397/1/377017

S. Wells, S. Hambric, T. Brungart

{"title":"Case study: Simulating and measuring the vibration and radiated sound of a large industrial chiller","authors":"S. Wells, S. Hambric, T. Brungart","doi":"10.3397/1/377017","DOIUrl":"https://doi.org/10.3397/1/377017","url":null,"abstract":"This paper presents a case study for measuring and simulating the vibration and radiated sound for a large complex industrial chiller. We describe a simulation framework based on statistical energy analysis (SEA), which is populated using a hybrid mix of analytic, numerical, and measurement\u0000 techniques. This hybrid approach was motivated by preliminary measurements of vibration and sound from the operating chiller, as well as a series of vibroacoustic transfer functions measured during quiescent non-operating conditions. Some components, like the chiller condenser shell, are modally\u0000 dense and well suited to statistical estimates of SEA parameters like modal density and coupling between the shell modes and internal and external acoustic spaces. Other components, like the discharge pipe between the compressor and condenser shell, have only a few well separated modes with\u0000 low damping. This component is better modeled using mobilities either measured or calculated using finite element analysis. We estimate other parameters like internal and coupling loss factors using a mix of analytics and measurements where appropriate. We validate the general model by comparing\u0000 simulated and measured transfer functions between the discharge pipe and condenser shell — the components that radiated the most sound. We estimate structure-borne and fluid-borne input powers from the compressor using inference techniques based on transfer function measurements at quiescent\u0000 conditions and averaged surface vibrations measured at operating conditions. This inference approach allows for estimating input powers over any chiller operating condition. Simulated vibrations and radiated sound are generally within 3 dB of measurements for several operating conditions.\u0000 This case study provides a useful general methodology for modeling and measuring the vibroacoustics of chillers and other complex machinery","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":"46330028","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

Identification of prominent noise components of an electric powertrain using a psychoacoustic model 使用心理声学模型识别电动动力系统的显著噪声成分

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI: 10.3397/1/37709

Yuebo He, Hui Gao, Hai Liu, Guoxi Jing

{"title":"Identification of prominent noise components of an electric powertrain using a psychoacoustic model","authors":"Yuebo He, Hui Gao, Hai Liu, Guoxi Jing","doi":"10.3397/1/37709","DOIUrl":"https://doi.org/10.3397/1/37709","url":null,"abstract":"Because of the electric power transmission system has no sound masking effect compared with the traditional internal combustion power transmission system, electric powertrain noise has become the prominent noise of electric vehicles, adversely affecting the sound quality of the vehicle\u0000 interior. Because of the strong coupling of motor and transmission noise, it is difficult to separate and identify the compositions of the electric powertrain by experiments. A psychoacoustic model is used to separate and identify the noise sources of the electric powertrain of a vehicle,\u0000 considering the masking effect of the human ear. The electric powertrain noise is tested in a semi-anechoic chamber and recorded by a high-precision noise sensor. The noise source compositions of the electric powertrain are analyzed by the computational auditory scene analysis and robust independent\u0000 component analysis. Five independent noise sources are obtained, i.e., the fundamental frequency of the first gear mesh noise, fundamental frequency of the second gear mesh noise, double frequency of the second gear mesh noise, radial electromagnetic force noise and stator slot harmonic noise.\u0000 The results provide a guide for the optimization of the sound quality of the electric powertrain and for the improvement of the sound quality of the vehicle interior.","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":"43890249","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: 2

Comparison of estimated and measured sound-absorption coefficient and transmission loss by geometric dimensions of a collection of equilateral triangular holes of equilateral triangular holes 等边三角形孔集合的几何尺寸对估计和测量的吸声系数和传输损失的比较

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI: 10.3397/1/377013

Shuichi Sakamoto, Kouta Sutou, Arata Nakano, Hirohiko Tanikawa, Takanari Azami, Tetsushi Shintani

{"title":"Comparison of estimated and measured sound-absorption coefficient and transmission loss by geometric dimensions of a collection of equilateral triangular holes of equilateral triangular holes","authors":"Shuichi Sakamoto, Kouta Sutou, Arata Nakano, Hirohiko Tanikawa, Takanari Azami, Tetsushi Shintani","doi":"10.3397/1/377013","DOIUrl":"https://doi.org/10.3397/1/377013","url":null,"abstract":"We performed a theoretical analysis on collection of equilateral triangular holes with consideration for sound wave attenuation within the tube and then calculated the sound-absorption coefficient and transmission loss. We then compared these results with experimental values. In the\u0000 experiment, we measured the sound-absorption coefficient and transmission loss of a test sample using impedance measurement tubes with two and four microphones. We estimated the sound-absorption coefficient and transmission loss because of the dimensions of a collection of equilateral triangular\u0000 holes through theoretical analysis and then compared these results with experimental values. In the present analysis, the propagation constant and characteristic impedance were introduced into a one-dimensional transfer matrix. Considering the effects of sound wave attenuation in the tubule\u0000 from three-dimensional analysis, we derived the propagation constant and characteristic impedance. Values for the sound-absorption coefficient and transmission loss obtained through the analysis of holes as triangles rather than as circles gave calculation results closer to the experimental\u0000 values. This is because this method more suitably simulates the effects of the boundary layer that occupies the space within the hole. The results show that the sound absorption coefficient and transmission loss of triangular honeycombs can be estimated with sufficient accuracy using only\u0000 geometric dimensions and physical properties.","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":"46574360","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

Noise reduction of bionic coupling blades of horizontal axis wind turbine 水平轴风力发电机仿生耦合叶片的降噪研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI: 10.3397/1/377015

Yixiao Li, Kun Chen, R. Gao, Jianhui Wei, Weiwei Yao

{"title":"Noise reduction of bionic coupling blades of horizontal axis wind turbine","authors":"Yixiao Li, Kun Chen, R. Gao, Jianhui Wei, Weiwei Yao","doi":"10.3397/1/377015","DOIUrl":"https://doi.org/10.3397/1/377015","url":null,"abstract":"Many bio-inspired researches for aerodynamic noise control of wind turbine have been carried out and obtained effective results. Inspired by the silent flight of owl, in this paper, the airfoil of owl's wing and the asymmetric sawtooth structure of the feather have been extracted and\u0000 reconstructed on the prototype wind turbine blades. The bionic airfoil blade and bionic coupling blade have been designed separately and compared with prototype blade. To obtain the asymmetric sawtooth structure with better acoustic performance, the sawtooth parameters are selected by orthogonal\u0000 test. The influence of airfoil and asymmetric sawtooth for acoustic performance of blade has been investigated with large eddy simulation method and Ffowcs Williams-Hawkings analogy method. The results show that the bionic coupling blade has a larger surface pressure difference compared with\u0000 the prototype blade and thus has better aerodynamic performance. The airfoil-structure coupling method can effectively reduce the aerodynamic noise of the blade without affecting the directivity of the acoustic, and optimized blade can reduce the noise by up to 8.42 dB. The blade coupling\u0000 airfoil has an inhibitory effect on intermediate and high frequency noise. After adding asymmetric sawtooth trailing edge, the noise in the low frequency and intermediate frequency range is further reduced.","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":"44476860","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

Visualization study of two-phase flow and noise control in a multiple temperature refrigerator during the defrost cycle 多温制冷机除霜循环过程中两相流动及噪声控制的可视化研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI: 10.3397/1/377014

Liang Pu, Shengqi Zhang, Yiguang Pan, Jinglong Sun, Qiang Li

{"title":"Visualization study of two-phase flow and noise control in a multiple temperature refrigerator during the defrost cycle","authors":"Liang Pu, Shengqi Zhang, Yiguang Pan, Jinglong Sun, Qiang Li","doi":"10.3397/1/377014","DOIUrl":"https://doi.org/10.3397/1/377014","url":null,"abstract":"To reduce the noise caused by the flow of refrigerant during the defrost cycle and preserve the ambient sound level, this study concentrated on exploring the mechanism of noise generation in the gas–liquid separator based on visualization experiments. A transparent gas–liquid\u0000 separator made of quartz glass, which was instead of the original one, was fabricated to observe the flow pattern of refrigerant in the gas–liquid separator, and the relationship between flow pattern and noise generation was investigated. The results showed that the noise is mainly generated\u0000 during the defrost cycle. The sound power level has a drastic fluctuation when the liquid level of refrigerant in the gas–liquid separator is higher than the outlet of the evaporation tube during the defrost cycle. The reduction in noise is achieved by the redesigns that prevent the\u0000 liquid level of refrigerant in the gas–liquid separator being higher than the outlet of the evaporation tube during the defrost cycle. Then, the noise level of original design and two redesigns was measured in a high precision semi-anechoicroom, respectively. The noise level of the refrigerator\u0000 reduces from 30.2 dB(A) to 26.1 dB(A) and 24.4 dB(A) by increasing the volume of the gas–liquid separator for 87.1% and installing a ball valve respectively.","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":"49254911","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

Experimental study on open-end correction of a Helmholtz resonator narrow slit neck 亥姆霍兹谐振腔窄缝颈开口校正的实验研究

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI: 10.3397/1/377011

S. Sakamoto, Y. Akiba, R. Iizuka, Shunsuke Watanabe, R. Kominami, Tetsushi Shintani

{"title":"Experimental study on open-end correction of a Helmholtz resonator narrow slit neck","authors":"S. Sakamoto, Y. Akiba, R. Iizuka, Shunsuke Watanabe, R. Kominami, Tetsushi Shintani","doi":"10.3397/1/377011","DOIUrl":"https://doi.org/10.3397/1/377011","url":null,"abstract":"In general, the acoustic effective length of the open end of an air column is longer than its geometric length. Here, the effective increment of the geometric length of an air column is called the open-end correction length, which is an acoustically crucial issue. The purpose of this\u0000 study is to experimentally clarify the open-end correction length for a slit shape with a narrow clearance. For this reason, the sound absorption coefficient was measured using a sample in which the neck of the Helmholtz resonator was shaped as a slit with a narrow clearance. Next, the open-end\u0000 correction length (i.e., mass end correction length and resistive end correction length) was calculated backward by comparing the experimental and theoretical sound absorption curves. The resistive end correction increased as the slit width became narrower within the range of 0.5 mm or less\u0000 for both the center slit and the slit near the wall, indicating a significant discrepancy between the theoretical equation and the estimated value. For the mass end correction, in the case the center slit, the estimated value is close to the theoretical value of in the slit width range from\u0000 0.3 mm to 1.0 mm. The results of this study may be useful in eliminating discrepancies in correction values for open-end correction in slits with narrow clearance.","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":"42977755","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

Application of FE-SEA approach in investigation of track properties influences on railway rolling noise generation FE-SEA方法在轨道性能对铁路滚动噪声产生影响研究中的应用

IF 0.4 4区工程技术

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI: 10.3397/1/377016

J. Sadeghi, Parinus Vedadi, M. Vasheghani

{"title":"Application of FE-SEA approach in investigation of track properties influences on railway rolling noise generation","authors":"J. Sadeghi, Parinus Vedadi, M. Vasheghani","doi":"10.3397/1/377016","DOIUrl":"https://doi.org/10.3397/1/377016","url":null,"abstract":"One of the main concerns in the railway transportation is environmental pollutions caused by railway noise. The most important source of this noise is the rolling contact between wheel and rail, and therefore, prediction of the rolling noise is a key factor in the management and reduction\u0000 of the noise. Despite numerous studies carried out on the rolling noise prediction in the available literature, the role of track components on the rolling noise has not been taken into account. That is, the power dissipation within the track superstructures has not been given sufficient consideration.\u0000 This is addressed in this research by investigating the influences of the track components on the level of railway rolling noise. For this purpose, a new noise prediction approach is developed in this research using finite element method and the statistical energy analysis. This approach has\u0000 an advantage of considering power dissipation along the track components compared with the previous approaches. The results obtained from the new approach were compared with field measurements carried out in this research. It is shown that the proposed finite element–statistical energy\u0000 analysis approach is effective in accurate predictions of the ballasted railway track noise.","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":"47983593","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

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