The International Journal of Acoustics and Vibration最新文献_第6页

Research on Suppression of Airflow Secondary Noise in a Muffler Based on Large Eddy Simulation 基于大涡模拟的消声器气流二次噪声抑制研究

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41896

Bo-rui Zhao, He Li

{"title":"Research on Suppression of Airflow Secondary Noise in a Muffler Based on Large Eddy Simulation","authors":"Bo-rui Zhao, He Li","doi":"10.20855/ijav.2022.27.41896","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.41896","url":null,"abstract":"Based on the Large Eddy Simulation (LES), the problem of the performance of a muffler being weakened by the airflow secondary noise in the expansion chamber was analyzed. Based on the different relative positions of the inlet and outlet, a single-chamber muffler is divided into four structures and a numerical simulation model of the flow field is developed. The LES was used to analyze the flow field and secondary noise in the expansion chamber. First, the LES is used to calculate the unsteady flow in the expansion chamber to obtain the turbulent intensity and the pressure pulsation distribution of the flow in the muffler chamber. Subsequently, a simulation model of the acoustic field was built separately to obtain the secondary noise distribution of the flow in the muffler by computing the flow field information. It is shown that the secondary noise properties in the muffler are related to its geometrical configuration. The turbulence intensity of the flow field in the chamber can be reduced by changing the airflow pattern in the chamber, to weaken the intensity of the airflow secondary noise. Finally, a structural modification of the two-chamber muffler was performed based on the findings of the study, and the improved muffler performance was evaluated through numerical simulations and field tests. Experimental results show that the improved muffler has better acoustic properties and increases the noise reduction capacity by about 18 percent. It further confirms that the intensity of secondary noise can be substantially suppressed by changing the internal structure of the muffler, which opens up new ideas for the future design and modification of exhaust mufflers.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123080500","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

Influence of Deformation on Sound-Absorbing Performance Under Hydrostatic Pressure 静水压力下变形对吸声性能的影响

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41876

Lie Yang, Xiuying Zhao, Kejian Wang, Hao Song, Zixian Cui

{"title":"Influence of Deformation on Sound-Absorbing Performance Under Hydrostatic Pressure","authors":"Lie Yang, Xiuying Zhao, Kejian Wang, Hao Song, Zixian Cui","doi":"10.20855/ijav.2022.27.41876","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.41876","url":null,"abstract":"The sound-absorbing rubber coating is easy to deform under hydrostatic pressure, resulting in variation in acoustic properties. For improving the accuracy of the deformation of the sound-absorbing structure under hydrostatic pressure, four hyperelastic constitutive models of Mooney-Rivlin, Neo-Hookean, Yeoh and Arruda-Boyce were selected in fitting the tensile curve of the dumbbell specimen and the compressive curve of a cylindrical specimen. The comparison in their applicability and the accuracy showed that the Yeoh model can predict the compressive properties of carbon black filled styrene-butadiene rubber. Simulation in mechanics-sound coupling was further conducted by COMSOL software and verified by the acoustic experiments, which exhibit the non-negligible effects of pressure and tubes inserted in the cavities on the deformation and sound-absorption coefficient. Hydrostatic pressure exerts the deformation and thereafter the energy dissipation in sound transfer. Inserting a rigid tube is beneficial to improve the ability of the sound-absorbing tile to resist deformation and enhance sound absorption and dissipation. The sound absorption coefficient was above 0.4 in the frequency band above 1.5kHz even under the hydrostatic pressure of 2MPa. The numerical simulation provides one methodological reference in analyzing the influences of the structural change and the operational conditions on the sound-absorbing coating.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132261971","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: 1

Book Reviews: Movement of Acoustic Energy in the Ocean (Vladimir A. Shchurov) 书评:海洋中声能的运动(弗拉基米尔A.什丘罗夫)

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.4br

Adrian Brown

引用次数: 0

Vibration Simulation of the Turbine Rotor System of an Underwater Vehicle Considering the Bearing Radial Clearance 考虑轴承径向游隙的水下航行器涡轮转子系统振动仿真

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41899

J. Liu, Lei Xue, Hengtai Ni

引用次数: 1

Experimental and Numerical Study on Flow-Induced Vibration of PWR Steam Generator U-Tubes 压水堆蒸汽发生器u形管流激振动的实验与数值研究

The International Journal of Acoustics and Vibration Pub Date : 2022-09-30 DOI: 10.20855/ijav.2022.27.31864

Xiong Guangming, Long Teng, Zhu Yong, Tian Ce, Guo Kai, T. Wei

{"title":"Experimental and Numerical Study on Flow-Induced Vibration of PWR Steam Generator U-Tubes","authors":"Xiong Guangming, Long Teng, Zhu Yong, Tian Ce, Guo Kai, T. Wei","doi":"10.20855/ijav.2022.27.31864","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.31864","url":null,"abstract":"The flow-induced vibration (FIV) of steam generators (SGs) in pressurized water reactors (PWRs) is a significant problem in the design process. This problem contains issues such as two-phase flow, nonlinear dynamics and fretting wear. In this paper, an experimental setup was established to study the FIV of a newly designed U-tube SG. Numerical simulations, including computational fluid dynamics (CFD) and vibration studies were performed to reveal the detailed mechanisms of FIV. To study the U-bend region of the tube bundles, the experiments were carried out under 23 experimental conditions containing void fractions of 70%, 80%, 90 and 95%. The flow fields of the tested model in each condition were calculated to reveal the causes of the vibration phenomenon, and the vibration results were calculated through structure dynamics. The experimental results showed that the vibration amplitudes of the U-tube increased with increasing inlet velocity, flow rate and bending radius. It decreased with increasing void fraction under the same inlet velocity, while it increased with increasing void fraction under the same flow rate. Along with the out-of-plane vibration, the in-plane vibration also featured high amplitude vibration of the U-tubes due to lack of support by the anti-vibration bars (AVBs). The simulation results show the same variation trends of the vibration responses as the above experiments. The prototype SG can be fluid-elastic stable in given working conditions, and the main vibration mechanism of this model is turbulence buffeting. The experiment and simulation methods and data can be used in the design process of new SGs similar to this prototype.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115372655","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

Isolation Efficiency of Vehicle Seat Suspension with Three Quasi-Zero Stiffness Models 三种准零刚度模型下汽车座椅悬架的隔振效率

The International Journal of Acoustics and Vibration Pub Date : 2022-09-30 DOI: 10.20855/ijav.2022.27.31858

Shiming Li, V. Nguyen, Renqiang Jiao, Deng Ni, Huaxiang Zhou

{"title":"Isolation Efficiency of Vehicle Seat Suspension with Three Quasi-Zero Stiffness Models","authors":"Shiming Li, V. Nguyen, Renqiang Jiao, Deng Ni, Huaxiang Zhou","doi":"10.20855/ijav.2022.27.31858","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.31858","url":null,"abstract":"This study proposes three different models of the quasi-zero stiffness (QZS) using the horizontal spring (QZS-HS), air piston (QZS-AP), and roller spring (QZS-RS) for the seat suspension of the vehicle to improve ride comfort. A dynamic model of the two-axle vehicle with the seat suspension added by the different QZS models has been established under the various excitations of the road surface. The design parameters of the different QZS models have been optimized to enhance the isolation efficiency and ride comfort. The indexes of the root mean square of the displacement (z_ws), acceleration (a_ws), and power spectral density acceleration (maximum PSD) of the driver's seat have been chosen to evaluate the vehicle's ride comfort and the isolation efficiency of three different QZS models. The results indicate that the seat suspension equipped with the different QZS models greatly improves the ride comfort in comparison with the seat suspension without the QZS. Also, the isolation efficiency of three different QZS models has been greatly affected by their design parameters. With the design parameters of the different QZS models optimized by the genetic algorithm, the stable value of the dimensionless restoring force of the optimal QZS-AP is lower than that of both the optimal QZS-HS and optimal QZS-RS. Particularly, under the random excitation of the road surface, the z_ws, a_ws, and maximum PSD have been greatly decreased by 41.4%, 73.8%, and 94.4% in comparison with the seat suspension without the QZS, respectively. Therefore, the optimal QZS-AP should be applied to enhance the driver's ride comfort and health.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127025831","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

Investigation of Piezoelectric Energy Harvesting From Structural Vibration Induced by Rotating Machinery 旋转机械结构振动中压电能量收集的研究

The International Journal of Acoustics and Vibration Pub Date : 2022-09-30 DOI: 10.20855/ijav.2022.27.31868

H. Ucar

{"title":"Investigation of Piezoelectric Energy Harvesting From Structural Vibration Induced by Rotating Machinery","authors":"H. Ucar","doi":"10.20855/ijav.2022.27.31868","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.31868","url":null,"abstract":"Increasing energy consumption has led recent efforts towards energy harvesting technologies. Among them, piezoelectric energy harvesting with piezo-based sensors and energy harvesters have gained significant attention due to their applicability and efficacy for microscale power generation systems. Present study aims to investigate energy harvesting with piezoelectric materials from structural vibration propagating throughout the structure from vibration sources. For this purpose, a use case of a mechanical pump mounted on a steel foundation is chosen. A Finite Element (FE) model of the foundation of the pump with piezoelectric energy harvesters is developed and validated in an experimental setup. Measured frequency response functions (FRFs) show particularly good match with simulation results. Afterwards, a real measured acceleration data from the mechanical pump is applied. Simulations are performed and effectiveness of the piezoelectric energy harvester for two different locations are demonstrated. In this study, piezoceramic (PZT), PVDF polymer, ZnO film and a PMN-PT single crystal composite is considered as harvester material and the effectiveness of each piezoelectric material are compared.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129681573","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

Numerical Investigation of Interaction Between Tubes and Loose Supports Caused by Turbulence-Induced Vibration in Steam Generators 蒸汽发生器紊流激振引起管与松散支承相互作用的数值研究

The International Journal of Acoustics and Vibration Pub Date : 2022-09-30 DOI: 10.20855/ijav.2022.27.31832

Kai Guo, Ce Tian, W. Tan

引用次数: 0

Investigation of Motorcycle Handle Vibration Attenuation using a Suspended Handlebar with Different Rubber Mount Characteristics 不同橡胶支座特性悬架摩托车车把减振研究

The International Journal of Acoustics and Vibration Pub Date : 2022-09-30 DOI: 10.20855/ijav.2022.27.31872

Nabil Mohamad Usamah, A. Mazlan, Z. M. Ripin

{"title":"Investigation of Motorcycle Handle Vibration Attenuation using a Suspended Handlebar with Different Rubber Mount Characteristics","authors":"Nabil Mohamad Usamah, A. Mazlan, Z. M. Ripin","doi":"10.20855/ijav.2022.27.31872","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.31872","url":null,"abstract":"Motorcycle riders are exposed to prolonged hand-transmitted vibration that can lead to hand numbness and trembling and, in extreme cases, disorders such as the Hand-arm Vibration syndrome (HAVs). The vibration of a motorcycle handle is the result of two major excitation forces, namely the engine vibration and the road-tire vibration. Operating the engine throttle control requires the rider to grip and twist the throttle handle which in turn provides a good vibration transmission path from the handle to the hand. The on-road measurement of hand-arm vibration (HAV) in a rider of an underbone single-cylinder motorcycle show a relatively high value of HAV, with a_hv of 8.28m/s^2. One feasible solution is to attenuate the handlebar vibration transmissibility, by using rubber mounts to create a suspended handlebar. In this study, based on Experimental Modal Analysis (EMA), a hand gripped modal model of the handlebar is developed, and the evaluation is done on the frequency responses of different handlebar designs. The selection criterion is based on the frequency response function (FRF) synthesis index (area under curve) and in this work the area under FRF curve is taken for frequency range of 0 ? 200Hz based on the HAV system. Order analysis of the handle vibration showed higher acceleration level in the z-axis (vertical) compared to the y-axis (horizontal) and for the on-road testing produces, much higher vibration level is determined compared to engine-related vibration due to the tire-road interaction. The suspended handlebar with the best performance is selected for actual on-the-road test, and the result shows a lower a_hv value of 4.08m/s^2 (51% reduction), which significantly increases the vibration exposure limit value (EAV) time from 44 minutes to 3 hours.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126557772","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

Quasi-3D Vibrational Analyses of Laminates and Sandwich Plates Resting on Elastic Foundations 弹性基础上层合板和夹层板的准三维振动分析

The International Journal of Acoustics and Vibration Pub Date : 2022-09-30 DOI: 10.20855/ijav.2022.27.31873

A. Zenkour, D. Mashat

引用次数: 0