Noise Control Engineering Journal Impact Factor & Information

Publisher: Institute of Noise Control Engineering; Acoustical Society of America

Journal description

Noise Control Engineering Journal is the technical publication of the Institute of Noise Control Engineering. NCEJ is issued bimonthly, and contains technical articles on all aspects of noise control engineering.

Current impact factor: 0.23

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2014 Impact Factor 0.227
2013 Impact Factor 0.462
2012 Impact Factor 0.315
2011 Impact Factor 0.223
2010 Impact Factor 0.245
2009 Impact Factor 0.138
2008 Impact Factor 0.167
2007 Impact Factor 0.317
2006 Impact Factor 0.186
2005 Impact Factor 0.17
2004 Impact Factor 0.175
2003 Impact Factor 0.304
2002 Impact Factor 0.07
2001 Impact Factor 0.121
2000 Impact Factor 0.197
1999 Impact Factor 0.241
1998 Impact Factor 0.115
1997 Impact Factor 0.204

Impact factor over time

Impact factor

Additional details

5-year impact 0.38
Cited half-life 8.20
Immediacy index 0.06
Eigenfactor 0.00
Article influence 0.14
Website Noise Control Engineering Journal (NCEJ) website
Other titles Noise control engineering journal
ISSN 0736-2501
OCLC 8974064
Material type Periodical
Document type Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, active control of harmonic sound transmitted through a soft-core sandwich panel is studied. As it has already been shown for the low frequency region, the noise transmission through a soft-core sandwich panel mainly occurs due to the flexural and the dilatational modes [Rimas Vaicaitis, NASA Technical Note, NASA TN D-8516, 1977]. Therefore, in this study, the volume velocity and weighted sum of spatial gradients methods are used to control these modes, and achieve sound attenuation in a broad frequency range. A point force actuator is used as the secondary force to control the radiation modes of the bottom faceplate. Radiated sound power from these two control theories are compared for different values of isotropic loss factor of core. Numerical studies indicate that irrespective of core loss factor weighted sum of spatial gradients method works well in a large frequency band without increasing the radiated sound power unlike the volume velocity method.
    Noise Control Engineering Journal 07/2015; DOI:10.3397/1/376331
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    ABSTRACT: Risk perception plays an important role in a person's decision to wear hearing protection to reduce the occurrence of noise induced hearing loss. Therefore, as part of the safety training for a worksite, it is important to educate workers about the potential sources of noise exposure at the worksite so that the workers are aware of the risk. However, teaching a workforce with a range of educational and language skill levels about the risk of noise at the workplace can be a challenge. Instructing people that sources of noise such as machinery are loud may not effectively communicate to people that they could be exposed to noise which is loud enough to damage their hearing. Furthermore, not all of the sources of noise at the worksite may be known or included in the safety training, potentially leading the workers to believe that they are not exposed to high noise emission levels when they actually are at the worksite. This paper describes a measurement method called video dosimetry which combines images taken with a wearable camera with sound pressure levels measured using a dosimeter to create first person videos. The videos show the actions the person wearing the camera was engaged in at the worksite and the corresponding exposure levels. This information can help safety advisors to identify the noise exposure risk while engaged in common actions at the worksite. Furthermore, the videos based on first person images represent an engaging tool for educating at risk workers about the noise exposure levels associated with common activities occurring in the worksite.
    Noise Control Engineering Journal 07/2015; 63(4):359-369. DOI:10.3397/1/376332
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    ABSTRACT: This study is concerned with the theory and application of a tuneable dynamic absorber. The dynamic characteristics of the tuneable dynamic absorber are discussed in terms of the mass ratio, natural frequency of the main structure, natural frequency of a dynamic absorber and excitation frequency. We proposed a semi-active dynamic absorber with a natural frequency that can change through the use of repulsive forces produced by permanent magnets and electromagnetic forces induced by current flowing through a coil. A simple active control algorithm is implemented in the LabView software and the experimental results showed that when the proposed semi-active dynamic absorber is used with the active control algorithm, the vibrations of a structure can be more effectively suppressed than when a passive dynamic absorber with a fixed natural frequency is used.
    Noise Control Engineering Journal 05/2015; 63(3). DOI:10.3397/1/376326
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    ABSTRACT: Aircraft flyover noise is a major source of community annoyance. The annoyance is affected by acoustic characteristics including onset rate, peak sound level and duration time. A simulated annoyance test was conducted on 30 subjects to analyze the effects from the three acoustic characteristics on annoyance. Results have shown that onset rate and duration time significantly determined annoyance while peak level had little effect. According to the importance of the exposure time, time above 75 dB was used as a new metric to illustrate the integral effects of onset rate and duration time. The curve of time above 75 dB was well fitted to an exponential-decrease equation which follows the sensory adaptation effect.
    Noise Control Engineering Journal 05/2015; 63(3). DOI:10.3397/1/376325
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    ABSTRACT: The objective of this paper is to investigate the status and validity of ambient noise standards in India and propose revisions for noise abatement and control based on the available knowledge on noise policies and regulations followed around the world. The annual average Lday (06-22 h) and Lnight (22-06 h) values observed under the pilot project on the establishment of National Ambient Noise Monitoring Network (NANMN) across seven major cities in India are analyzed for ascertaining the magnitude of annual average ambient noise levels, planning for noise abatement action plans and formulation of revised ambient noise standards in India. It is envisaged that the proposed revisions shall be instrumental in execution of noise abatement action plans for controlling noise pollution in India.
    Noise Control Engineering Journal 05/2015; 63(3). DOI:10.3397/1/376324
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    ABSTRACT: Taking into account tire-pavement noise and tires classification with respect to noise emission special measurement methods are usually used. When two of them are applied (the Laboratory Drum Method (DR) and the Close-Proximity Method (CPX)) the investigator has to be sure that the position of the tire is correct. The authors of this paper thought about tire position as tire (wheel) alignment—in particular tire camber angle. T hey intended to present its influence on tire-pavement noise.
    Noise Control Engineering Journal 05/2015; 63(3). DOI:10.3397/1/376320
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    ABSTRACT: In this study, we propose a rectangular and cylindrical three-dimensional space sound absorber using a permeable membrane and the absorption characteristics which are examined experimentally by reverberation room method. As a pilot study, a two-dimensional boundary element (2-D BEM) analysis is also conducted to predict the absorption characteristics of the absorbers. The experimental study revealed that the absorption coefficient is low at low frequencies and gradually increases with frequency. The absorption coefficient converges to 0.5 at the maximum which is similar to a single-leaf permeable membrane. The flow resistance and the surface density of the permeable membrane mainly affect the absorption characteristics at middle to high frequencies. At low frequencies, the heavy membrane contributes to the higher absorption performance. In the experiment specimens with high flow resistance produce higher absorptivity. Also, the cylindrical absorber shows slightly higher absorption coefficient than the rectangular absorber mainly at low frequencies. The 2-D BEM results show similar frequency characteristics as the measured values when the membrane's flow resistance and surface density are low, but the numerical values overestimate overall the absorptivity of the absorbers.
    Noise Control Engineering Journal 05/2015; 63(3). DOI:10.3397/1/376327
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    ABSTRACT: In a residential area exposed to road traffic noise a socio-acoustic longitudinal study was conducted to investigate the effects of a large intervention project on acoustical conditions and resident's noise responses. The paper presents results on general noise annoyance, noise disturbed activities and perceptions of the sound environment in relation to obtained noise levels before and after the interventions. The most comprehensive abatement measures implemented were construction of new buildings that filled in gaps between buildings facing the highway and erection of a noise barrier to create less noise-exposed courtyards and sides of the dwellings. One building site had a considerable renovation, such as installation of new windows, glazed-in balconies, and an upgrading to two-sided flats with windows facing the quieter courtyard. Overall in the residential area, noise levels were reduced with 5-10 dB at the most traffic exposed side and with 4-10 dB at the less noise exposed side. General noise annoyance and sleep disturbances decreased substantially and the perceived sound environment indoors and outdoors was improved for a majority of the investigated building sites. Through the successful combination of measures taken in the residential area, we obtained significant positive effects; however, measures to further reduce the negative impacts of noise on health and well-being and to improve the sound environment are needed and suggested.
    Noise Control Engineering Journal 05/2015; 63(3). DOI:10.3397/1/376323
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    ABSTRACT: A new spectral-based multi-substructure theory is formulated to compute the frequency responses of mechanical systems that are subdivided into multiple inter-connected substructures. The proposed approach employs the free substructure frequency response functions at the coupling, response and excitation coordinates of interest to construct the complete system model using a single efficient coupling step. Even though this proposed approach is conceptually similar to the conventional transfer path analysis, it is more extensive because of the capability to analyze structural systems with arbitrary numbers of substructures and coupling coordinates. Hence, the proposed methodology can be applied to treat complex multi-substructure mechanical structures commonly found in automotive and aerospace systems. In the present study, several lumped parameters mass-spring-damper systems are analyzed to validate the proposed theory. The comparison results show excellent agreement between the multi-substructure predictions and the single complete system calculations.
    Noise Control Engineering Journal 03/2015; 63(2). DOI:10.3397/1/376312
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    ABSTRACT: This paper describes recent occurrences of noise ordinance overhauls in central Florida for the City of Winter Springs and Hillsborough County, Florida. In each case, the existing Lmax based ordinances had proven over the years to be ineffective and were not serving their communities. These noise ordinances were similar to many found across the U.S. but were not reliable methods of determining community noise violators that warranted action. This paper explains the methodology used to produce a “performance based” noise ordinance that meets the needs of both the community and local personnel responsible for enforcement.
    Noise Control Engineering Journal 03/2015; 63(2). DOI:10.3397/1/376311
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    ABSTRACT: An experimental-analytical procedure was implemented to reduce the operating noise level of a nail gun, a commonly found power tool in a construction site. The procedure is comprised of preliminary measurements, identification and ranking of major noise sources and application of noise controls. Preliminary measurements show that the impact noise transmitted through the structure and the exhaust related noise were found to be the first and second major contributors. Applying a noise absorbing foam on the outside of the nail gun body was found to be an effective noise reduction technique. One- and two-volume small mufflers were designed and applied to the exhaust side of the nail gun which reduced not only the exhaust noise but also the impact noise. It was shown that the overall noise level could be reduced by as much as 3.5 dB, suggesting that significant noise reduction is possible in construction power tools without any significant increase of the cost.
    Noise Control Engineering Journal 03/2015; 63(2). DOI:10.3397/1/376315
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    ABSTRACT: A kind of phononic crystal shaft with piezoelectric ceramic circular rings is proposed in this paper. Based on the wave equation, the propagating characteristics of torsional wave are calculated by the transfer matrix method. The torsional wave band structures of infinite piezoelectric phononic crystal shaft (PPC shaft) and transmission curves of finite PPC shaft are analyzed, then simulations are carried out to verify the theoretical results by using ANSYS software. Furthermore, the effects of outer active control on the torsional wave band gaps are considered by changing feedback control gains. The influences of the ratios of length and cross-sectional area on the band gaps are also discussed in detail. Results show that there exist band gaps of torsional vibration in this special PPC shaft and the width together with the position of the band gaps can be adjusted effectively by varying structural parameters and outer active control gains.
    Noise Control Engineering Journal 03/2015; 63(2). DOI:10.3397/1/376319
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    ABSTRACT: The demand for motorcycles has seen steady growth in recent years. For motorcycles, as well as automobiles in general, sound quality (SQ) is one of the important factors affecting riding comfort. Thus, as with the wider field of automobile manufacturing, motorcycle manufacturers regard SQ-based noise control as a useful tool for improving competitiveness and popularity in the global commercial market. Among the numerous parts of a motorcycle, the exhaust system is the key to determining the SQ, as well as its performance. In this study, the distribution of the exhaust noise energy of a cruiser type of motorcycle in the frequency domain was proposed to improve its SQ. To this end, the audible frequency range was divided into three bands based on its effect on the perceptual feeling described as pleasant. To obtain a desirable energy distribution, a subjective listening experiment based on a semantic differential method was conducted with the modified exhaust noises by changing the band level of each division of the frequency band. A hierarchical clustering analysis and factor analysis were applied to the results of the subjective experiment in order to determine the relation between the subjective feeling and the variation in the spectral shapes of the exhaust noises. The results showed that perceptual feelings described as pleasant, expensive, and classic were strongly influenced by a change in the band level in the low-frequency range below 300 Hz, whereas the hard and crispy perceptions were influenced in the high-frequency range above 1 kHz. To quantitatively represent such situations, the energy ratio and partial-loudness ratio representing the energy balance were defined and calculated. Finally, it was found that a larger energy ratio or partial-loudness ratio resulted in a better SQ for the exhaust noise of the cruiser type of motorcycle.
    Noise Control Engineering Journal 03/2015; 63(2). DOI:10.3397/1/376316
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    ABSTRACT: Sound quality analysis is a process that is used to study subjective perception of the functionality or preference of a product based on the sound that it makes. Paired comparison jury testing is often used to understand preference on a pairwise basis and map the results onto an interval scale using a Bradley-Terry model. This provides a merit score for each of the sounds used in the study. A statistical model, such as multiple linear regression (MLR), is then used to model the merit score using objective metrics. This statistical model, or preference equation, then allows the results of the jury testing to be generalized for use with other sounds. One drawback of this approach is the necessity to assume the form of the preference prior to applying the statistical model and the requirement of the Bradley-Terry model for a full and balanced jury study. The present paper proposes a method of using a nested artificial neural network (nested ANN) to learn the paired preferences directly. The nested ANN architecture can uncover non-linear preferences and does not require a full and balanced jury study. The nested ANN model is applied to real golf club jury study results to identify the presence of a non-linear preference for the pitch of the ball impact sound. The paper concludes by demonstrating how the nested ANN model can be simplified to ease interpretation of the preference model and provide a means of optimizing the sound quality in the context of active noise control for sound quality.
    Noise Control Engineering Journal 03/2015; 63(2). DOI:10.3397/1/376313
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    ABSTRACT: The objective of this work is to propose a methodology to dimension several floor building's facade sound insulation, according to each floor and the external noise levels. The proposed methodology combines three-dimensional acoustic mapping with a linear graphical comparison. A twenty-six floor building with approximately 82 m high located in downtown Curitiba, PR (Brazil) was taken as an example to apply the methodology. The results have shown that the building is subjected to a three different ranges sound pressure level gradient. For each of these ranges, different facade sound insulation features need to be considered. The combined methodology ensures acoustic comfort for all the occupants of the building without any waste of resources, avoiding insufficient or excessive facade sound insulation.
    Noise Control Engineering Journal 03/2015; 63(2):152-158. DOI:10.3397/1/376314
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    ABSTRACT: In typical household refrigeration systems, the compressor is structurally connected with the cabinet through an assembly composed of rubber mounts and a steel support plate, usually called the base-plate. This plate works as a vibration energy path from the compressor to other refrigerator components, and its dynamic behavior must be known to avoid the coincidence of operational and resonant frequencies, a situation in which the energy flow is maximized. One way to design a support that satisfies this requirement is to optimize the shape of the plate by locating its structural modes as far as possible from the operational frequency and its first harmonics. In this work, the finite element method (FEM) is used to solve the eigenvalue problem and to parameterize the optimization procedure, which is based on positioning of the nodes of a design region (plate) in an FEM-simplified model. Owing to the large number of variables, a gradient-based method is adopted. The objective of the methodology is to maximize the difference between two adjacent eigenvalues near the fundamental operation frequency of the compressor in order to obtain a large and effective bandgap. A geometrical constraint is imposed on the problem and it is represented by the maximum allowable deformation of the plate. The gradients needed are obtained using information of the elementary stiffness and mass matrices. The obtained results show that the procedure leads to a new shape, which ensures the desired dynamic characteristics for the support plate.
    Noise Control Engineering Journal 02/2015; 63(1). DOI:10.3397/1/376306