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Evaluation of Environmental sound pressure level,Drawing of Noise-Isosonic Map Using Surfer V.19,and Prioritization of Engineering Noise Control Methods Using the Analytic Hierarchy Process(AHP):A Field Study in CGS Stations

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sound & Vibration 2022年第3期56卷 275-291页

作者： Sajad Zare Abdolrasoul Rahmani Javad Korouzhdeh Masoud Hajghani Rouhollah Rostami Reza Esmaeili Department of Occupational Health Engineering and Safety at Work Faculty of Public HealthKerman University of Medical SciencesKerman***Iran Social Determinants of Health Research Center Institute for Futures Studies in HealthKerman University of Medical SciencesKerman***Iran Department of Occupational Health and Safety School of HealthLarestan University of Medical SciencesLarestan***Iran Student Research Committee Kerman University of Medical SciencesKerman***Iran Department of Industrial Engineering Shahid Bahonar University of KermanKerman***Iran Department of Occupational Health Engineering and Safety at Work Faculty of Public HealthUrmia University of Medical SciencesUrmia***Iran Department of Occupational Health Engineering School of HealthIsfahan University of Medical SciencesIsfahan***Iran

Noise pollution is one of the most significant harmful physical factors in the industrial and occupational environments.Due to the high costs of exposure to excessive noise;continuous sound evaluation,propose and implement noise control plans in occupational environments is necessary.Thus,the present study aimed to review environmental sound measurements,drawing of noise maps,and prioritizing the engineering noise control methods using the Analytic Hierarchy Process(AHP).This study was a descriptive-analytical study that aimed to assess occupational noises and present a control plan in the City Gas Stations(CGSs)of Kerman,Iran in 2021.The present study was done in two phases.In the first phase,six CGSs were investigated to measure and evaluate the noise.In addition,the noise map of a CGS was drawn using the Surfer software.Finally,the AHP was used in the second phase of the research to prioritize the control measures.In this phase,four criteria and ten alternatives were identified.According to first phase results,the sound pressure level(SPL)of the stations varied from 76 to 98 dBA.Besides,the majority of the studied stations had a sound level higher than 85 dBA(danger zone).The second phase of the study showed that out of the four evaluated criteria,the executability criterion had the highest impact and the cost criterion had the lowest impact on the selection of control measures with a weight of 0.587 and 0.052,respectively.Based on the results of prioritization of the alternatives,using a silenced regulator(weight of 0.223)and increasing the thickness of the tube(weight of 0.023)had the highest and lowest priorities among the alternatives,respectively.The use of engineering noise control methods such as using silenced regulators was the best way to control the noises of CGSs.Additionally;it is noteworthy that AHP is a practical method for prioritizing alternatives to achieve the most accurate decision-making.The results of AHP can be of great help to health and safety experts and managers in choosing the sound

关键词： Engineering noise control sound pressure level noise map analytic hierarchy process

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Evaluation of Individual and Environmental sound pressure level and Drawing Noise-Isosonic Maps Using Surfer V.14 and Noise at Work V.5.0

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sound & Vibration 2021年第2期55卷 163-171页

作者： Sajad Zare Rasoul Hemmatjo Hossein ElahiShirvan Ashkan Jafari Malekabad Mansour Ziaei Farshad Nadri Department of Occupational Health School of Public HealthKerman University of Medical SciencesKermanIran Department of Occupational Health School of Public HealthUrmia University of Medical SciencesUrmiaIra Student Research Committee Kerman University of Medical SciencesKermanIran Department of Occupational Health School of Public HealthBushehr University of Medical SciencesBushehrIran Department of Occupational Health School of Public HealthKermanshah University of Medical SciencesKermanshahIran

Noise pollution is one of the common physical harmful factors in many work environments.The current study aimed to assess personal and environmental sound pressure level and project the sound-Isosonic map in one of the Razavi Khorasan Paste manufacture using Surfer V.14 and Noise at work V.5.0.This cross-sectional,descrip-tive study is analytical that was conducted in 2018 in the Paste factory that contains Canister,production and Brewing unit.Following ISO 9612:2009,Casella Cel-320 was used to measure personal sound pressure level,while CEL-450 sound level meter(manufactured by Casella-Cel,the UK)was employed to assess environmental sound pressure level.Statistical analyzes was done using SPSS V.18 and Linear Regression test.The sound-isosonic maps were projected using Surfer V.14 and Noise at work V.5.0.The results of assessing personal sound pressure level indicated that the highest received dose(172.21%)and personal equivalent sound level(87.36 dBA)were recorded for workers in the Canister unit.According to results of measuring of the environmental sound pressure level,out of 16 measurement stations in this unit,overall 87.5%were regarded as danger and caution areas.The lowest and highest sound pressure levels in this units were 61 dBA and 92 dBA that belong to Brewing and Canister units respectively.Results indicate Over 75%of the Canister and production units had a sound pressure level greater than 85 dBA and these two units were regarded as the most dangerous area in terms of noise pollution.It is there-fore necessary to implement noise control measures,apply hearing protection program and auditory tests among workers in these units.

关键词： sound pressure level personal sound environmental sound sound map isosonic map surfer noise at work

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Presenting a Signal to Noise Ratio Model Based on the Combined Effect ofsound pressure level/frequency, Exposure Time and Oral Potassium:Experimental Study in Rats

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sound & Vibration 2020年第1期54卷 17-25页

作者： Parvin Nassiri Sajad Zare Mohammad Reza Monazzam Akram Pourbakht Rasoul Hemmatjo Hossein ElahiShirvan Department of Occupational Health School of Public HealthTehran University of Medical SciencesTehranIran Student Research Committee Kerman University of Medical ScienceKermanIran Department of Audiology School of RehabilitationIran University of Medical SciencesTehranIran Department of Occupational Health School of Public HealthUrmia University of Medical SciencesUrmiaIran

Exposure to noise can lead to anatomical,nonauditory,and auditory impacts.The auditory influence of noise exposure is manifested in the form of Noise-induced hearing loss(NIHL).The current study aimed at present a signal to noise ratio model of otoacoustic emission of rats’ears in the light of the combined effect of sound pressure level,sound frequency,exposure time,and potassium concentration of the used water.In total,36 adult male rates,whose age varied from 3 to 4 months and had a weight of 200±50 g,were randomly divided into 12 groups,with each group consisting of 3 rats.The rats in both groups(case and control groups)were exposed to SPLs of 85,95,and 105 dB,emitted from sources that generated white noise.A distortion product otoacoustic emission(DPOAE)machine(4000 I/O manufactured by Homoth of Germany)was utilized to gauge the signal to noise ratio(SNR)of otoacoustic emissions of rats’ears at various frequencies in an acoustic room.The inclusion criterion was SNR≥6 dB.The collected data were fed into the Statistical Package for Social Sciences(SPSS)version 18,followed by conducting descriptive and inferential data analysis procedures.The results of SNR analysis indicated that over 82%of all data had SNRs that were equal to or greater than 6 dB.These data were considered as acceptable response.Furthermore,SPL and sound frequency had significant associations with SNR(Psound pressure levels result in lower DPOAE.Furthermore,higher frequency leads to higher SNR.On the contrary,longer exposure time reduces SNR.Finally,the potassium concentration of the used water has no effect on SNR.

关键词： Noise sound pressure level potassium DPOAE rat

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Study on aerosol agglomeration using the airborne ultrasonic transducer

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Particuology 2023年第11期82卷 157-165页

作者： Yuxin Guo Guangxue Zhang Yunchao Li Hailin Gu Dingkun Yuan Maosheng Liu The Institute for Energy Engineering China Jiliang UniversityHangzhou310000China

Acoustic agglomeration technology use high-intensity acoustic field to make aerosol particles collide and condense rapidly. Existing studies have shown that 70%–90% of fine particles can be eliminated within minutes using compression drives and air-jet generators. Currently, there are limitations to the sound sources used. In this paper, an airborne ultrasonic transducer with a resonant frequency of 15 kHz is designed, followed by the corresponding numerical simulation and experiments for the evaluation of the vibration modal and sound pressure field. The sound pressure levels (SPL) of the open space and the agglomeration chamber can reach 150 dB and 156 dB, respectively. The agglomeration effect of water droplets, liquid phase smoke, solid phase smoke and mixed smoke is experimentally investigated, and the light transmittance rapidly increases from 8% to 60% within 4 s, 8 s, 5 s and 6 s, respectively. Agglomeration is also effective in the high-frequency range, and we infer that the acoustic wake effect is the predominant mechanism. The elimination effect is promoted with the increasing of SPL until the corresponding secondary acoustic effect is enhanced. Moreover, the agglomeration rate of higher concentration aerosol is significantly better than that of diluted aerosols in ultrasonic agglomeration process.

关键词： Acoustic agglomeration Airborne ultrasonic transducer Aerosol sound pressure level Initial concentration

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Temporal variation of the underwater soundscape in Jiaotou Bay,an Indo-Pacific humpback dolphin(Sousa chinensis)habitat off Hainan Island,China

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Integrative Zoology 2021年第4期16卷 477-498页

作者： Lijun DONG Jianchen DONG Francesco CARUSO Likun ZHAO Songhai LI Marine Mammal and Marine Bioacoustics Laboratory Chinese Academy of SciencesInstitute of Deep-sea Science and EngineeringSanyaChina University of Chinese Academy of Sciences BeijingChina Tropical Marine Science Institute National University of SingaporeSingapore Function Laboratory for Marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyQingdaoChina

The underwater soundscape is an important ecological element affecting numerous aquatic animals,in particular dolphins,which must identify salient cues from ambient ocean noise.In this study,temporal variations in the soundscape of Jiaotou Bay were monitored from February 2016 to January 2017,where a population of Indo-Pacific humpback dolphins(Sousa chinensis)has recently been a regular sighting.An autonomous acoustic recorder was deployed in shallow waters,and 1/3-octave band sound pressure levels(SPLs)were calculated with central frequencies ranging from 25 Hz to 40 kHz,then were grouped into 3 subdivided bands via cluster analysis.SPLs at each major band showed significant differences on a diel,fishing-related period,seasonal,and tidal phase scale.Anthropogenic noise generated by passing ships and underwater explosions were recorded in the study area.The fish and dolphin acoustic activities both exhibited diel and seasonal variations,but no tidal cycle patterns.A negative significant relationship between anthropogenic sound detection rates and dolphin detection rates were observed,and fish detection rates showed no effect on dolphin detection rates,indicating anthropogenic activity avoidance and no forced foraging in dolphins in the study area.The results provide fundamental insight into the acoustic dynamics of an important Indo-Pacific humpback dolphin habitat within a coastal area affected by a rapid increase in human activity,and demonstrate the need to protect animal habitat from anthropogenic noises.

关键词： acoustic monitoring anthropogenic noise dolphin detection rate sound pressure level temporal difference

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Aeroacoustic and aerodynamic optimization of propeller blades

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Chinese Journal of Aeronautics 2020年第3期33卷 826-839页

作者： Peixun YU Jiahui PENG Junqiang BAI Xiao HAN Xiang SONG School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

It is of great significance to develop a high-efficiency and low-noise propeller optimization method for new-generation propeller aircraft design.Coupled with free form deformation method,dynamic mesh interpolation technology,optimization algorithm,surrogate model,aerodynamic calculation and aeroacoustic prediction model module,the integrated aerodynamic and aeroacoustic design method of propeller is built.The optimization design for the six-blade propeller is carried out.The non-reduction in efficiency,thrust coefficient and the minimum of aerodynamic noise is treated as the optimization design objective.The spatial vorticity distribution of the propeller before and after the design is also analyzed by using unsteady computational fluid dynamics method.The results show that the optimized propeller can effectively reduce the aerodynamic noise level.The maximum total sound pressure level can be reduced by 5 dB without reducing its aerodynamic performance.The developed method has good application potential in low-noise optimization design of propeller and other rotating machinery.

关键词： Aeroacoustic Aerodynamic Dynamic mesh interpolation technology Free form deformation method Optimization algorithm Propeller sound pressure level Surrogate model

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On the Impact of Bell sound on Ambient Particulates

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Journal of Atmospheric Science Research 2022年第4期5卷 29-34页

作者： Konstantinos Kourtidis Ageliki Andrikopoulou Department of Environmental Engineering Democritus University of ThraceXanthi67100Greece

Here the authors examine whether bell sounds can have an impact on ambient aerosol levels and size distribution under atmospheric conditions.The authors present calculation results for acoustic coagulation by church bell sounds for a range of ambient aerosol types.The results show that for orthokinetic sonic agglomeration,while the frequency spectrum of church bells is ideal for causing coagulation of ambient aerosols,the sound pressure level(SPL)becomes too low for an effect.However,for very polluted conditions,at extremely short distances from the bell dust aerosols can readily undergo sonic coagulation.

关键词： sound Aerosols Particulate matter sound pressure level

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非均匀船舶尾流中工作的常规和大侧斜船用螺旋桨的水动力和水声计算预报

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Journal of Marine Science and Application 2020年第1期19卷 28-40页

作者： S.E.Belhenniche O.Imine O.K.Kinaci Naval Aero-Hydrodynamic Laboratory Marine Engineering DepartmentUSTO MB31000 OranAlgeria Aeronautics and Propulsion Systems Laboratory Mechanical Engineering DepartmentUSTO MB31000 OranAlgeria Faculty of Naval Architecture and Ocean Engineering Istanbul Technical UniversityAyazaga34349 IstanbulTurkey Department of Naval Architecture and Marine Engineering Istanbul Technical University TRNC CampusFamagusta 99520Northern Cyprus

Despite their high manufacturing cost and structural deficiencies especially in tip regions,highly skewed propellers are preferred in the marine industry,where underwater noise is a significant design criterion.However,hydrodynamic performances should also be considered before a decision to use these propellers is made.This study investigates the trade-off between hydrodynamic and hydroacoustic performances by comparing conventional and highly skewed Seiun Maru marine propellers for a noncavitating case.Many papers in the literature focus solely on hydroacoustic calculations for the open-water case.However,propulsive characteristics are significantly different when propeller-hull interactions take place.Changes in propulsion performance also reflect on the hydroacoustic performances of the propeller.In this study,propeller-hull interactions were considered to calculate the noise spectra.Rather than solving the full case,which is computationally demanding,an indirect approach was adopted;axial velocities from the nominal ship wake were introduced as the inlet condition of the numerical approach.A hybrid method based on the acoustic analogy was used in coupling computational fluid dynamics techniques with acoustic propagation methods,implementing the Ffowcs Williams-Hawkings(FW-H)equation.The hydrodynamic performances of both propellers were presented as a preliminary study.Propeller-hull interactions were included in calculations after observing good accordance between our results,experiments,and quasi-continuous method for the open-water case.With the use of the time-dependent flow field data of the propeller behind a nonuniform ship wake as an input,simulation results were used to solve the FW-H equation to extract acoustic pressure and sound pressure levels for several hydrophones located in the near field.Noise spectra results confirm that the highest values of the sound pressure levels are in the low-frequency range and the first harmonics calculated by the present method are in good accordance with the theor

关键词： Seiun Maru Moving reference frame Underwater acoustics Underwater noise sound pressure level Blade passing frequency FW-H equation Hydrophones

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Gearbox’s Noise level Prediction by Combination Vibration and sound Signal

Gearbox’s Noise Level Prediction by Combination Vibration a...

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第六届国际振动工程会议

作者： Hongkun Li1 + Shuangshuang Tong Zhengang Guo Liting Zhou 1 School of Mechanical Engineering Dalian University of Technology Dalian 116024 China

Gearbox has been broadly used on the mechanical production and transportation. But it produces much noise during its working process. Noise test must be carried on before the gearbox leave factory. Accurate and convenient noise level estimation for gearbox is more and more important. Traditional method by using sound level meter is not suitable to estimate gearbox’s noise because there is much noise interference in the testing room and different working condition testing. To be satisfied with the requirement of sound pressure level, a new estimation method is put forward in this paper. Contrast with sound level meter, several vibration and acoustics pressure sensors are used during the monitoring process. The vibration and noise data with different monitoring position can be acquisition together. According the developed technology "substituting vibration on noise", a noise estimation vector can be obtained. According to the combination predication method, linear neural network algorithm is used in this paper to predict noise level for gearbox. To testify the effectiveness of this method, an experiment has been carried on in lab with different working conditions for gearbox. According to the result analysis, this method is very accurate for the noise measurement. At the same time, this method also very useful to evaluate gearbox performance before it leaves factory. Thus, it is very suitable for some type gearbox production noise detection. This method will be very promising for gearbox production.

关键词： sound pressure level Gearbox noise Substituting vibration for noise Noise prediction

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THE INVESTIGATION ON ACCELERATING THE AGING OF WINE BY ULTRASONIC WAVE

THE INVESTIGATION ON ACCELERATING THE AGING OF WINE BY ULTRA...

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2015全国压电和声波理论及器件技术研讨会

作者： Yong-wei LIU Qi LI Hui-bin SUN De-jiang SHANG Jun-dong SUN Acoustic Science and Technology Laboratory Harbin Engineering University College of Underwater Acoustic Engineering Harbin Engineering University Qingdao Langyatai Group Limited Corporation

Wine has played an important role in people’s daily lives.The method of accelerating the aging of wine by different ultrasonic wave is reported.A system has been built up.Three kinds of composite rod transducers are mounted at the bottom of three cylindrical steel barrel.The diameter of cylindrical steel barrel is 300 mm,400 mm,and 500 mm,respectively.The resonant frequency of transducers is 25 kHz,40 kHz,60 kHz,respectively.The barrel is filled with water and the temperature of water is 20℃.The sound pressure level in the barrel is 170 dB,180 dB,200 dB,respectively.When sound pressure level is 200 dB,acoustic cavitation is observed.The wine,which is brewed by sorghum and wheat,is contained in five glass bottles,and considered to be one sample.Then,each sample is put into the barrel.The alcohol content in the wine is 70.0.At a certain sound pressure level,the working time is 5 minutes,10 minutes,20 minutes,respectively.In total,there are 27 samples of wine by the treatment of ultrasonic wave.Besides,an origin sample without ultrasonic wave treatment is selected as the comparison.The sound field distribution of the barrel is simulated by the software of VIRTUAL LAB.In the simulation,sound field distribution of the barrel is not uniform and each sample should be spatially averaged.The total acid,total ester,ethyl lactate,ethyl caproate,and alcohol content of each sample have been tested.The test period is 1 hour,2 days,4 days,8 days,30 days,respectively,after the process of ultrasonic wave treatment.The effect of ultrasonic wave on alcohol content,total acid,total ester,ethyl lactate,ethyl caproate has been discussed.

关键词： Wine Alcohol content Ethyl caproate Ultrasonic wave sound pressure level sound field distribution

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