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Noise control technology for generator sets in enclosures

ZHANG Nailong, YANG Wentong, FEI Renyuan

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 377-384 doi: 10.1007/s11465-008-0051-0

Abstract: To reduce such noise, a sound-attenuated enclosure is widely used for its high performance and convenientBy installing equipment in an enclosure, noise is controlled and prevented from radiating.Enclosure development trends are predicted.

Keywords： equipment     generator     sound-attenuated enclosure     convenient     Enclosure development    

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Analysis of Sound Radiation of Two ConnectedElastic Rectangular Enclosure

Yao Haoping,Zhang Jianrun,Chen Nan,Sun Qinghong

Strategic Study of CAE 2007, Volume 9, Issue 3,   Pages 41-46

Abstract:

The model of sound radiated from two connected rectangular enclosuresNumerical results on the radiation of sound are presented.results are intended to investigate two main issues:one is that the direct force affects the radiation of soundforce does, the other is that the translational stiffness at connected points affects the radiation of sound

Keywords： the radiation of sound     connection     rectangular enclosure     coupling    

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From dBA to soundscape indices: Managing our sound environment

Jian KANG

Frontiers of Engineering Management 2017, Volume 4, Issue 2,   Pages 184-192 doi: 10.15302/J-FEM-2017026

Abstract: ., reduction of ‘sound level’, does not always deliver the required improvements in quality of life.The growing field of ‘soundscape studies’ is addressing this gap by considering the sound environmentsoundscape indices; and demonstrating the applicability of the soundscape indices in the management of our sound

Keywords： noise     soundscape     management     sound     environment     soundscape index    

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Numerical study on natural convection in a square enclosure containing a rectangular heated cylinder

Jianhua LU, Zhaoli GUO, Zhenhua CHAI, Baochang SHI,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 373-380 doi: 10.1007/s11708-009-0078-x

Abstract: In this paper, the natural convection in a square enclosure with a rectangular heated cylinder is investigated

Keywords： natural convection     buoyant regime     heated cylinder     lattice Boltzmann    

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From understanding to designing soundscapes

Jian KANG

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 4,   Pages 403-417 doi: 10.1007/s11709-010-0091-5

Abstract: Soundscape represents a step change in the field of environmental acoustics in that it combines physical, social, and psychological approaches. Although the term soundscape was introduced in the 1960s, significant attention to it has mainly been paid in the last decade or so in the community of environmental acoustics by researchers and recently by practitioners including policy makers. This paper explores the current situation and future challenges in soundscape. Starting with a framework on research and practical needs in soundscape and a brief introduction of some recent/current networks, activities, projects, and publications, this paper then presents a systematic review of recent progress in soundscape research and practice. A short review of the soundscape research in China is also given.

Keywords： soundscape     environment     sound     design     urban     landscape    

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RR1 and RR2 gene deletion affects the immunogenicity of a live attenuated pseudorabies

Shijun YAN,He YAN,Chaolin ZHANG,Tongyan WANG,Qingyuan YANG,Zhe SUN,Yan XIAO,Feifei TAN,Xiangdong LI,Kegong TIAN

Frontiers of Agricultural Science and Engineering 2016, Volume 3, Issue 1,   Pages 81-86 doi: 10.15302/J-FASE-2016088

Abstract: As virulence-determining genes, and encode the small subunit and large subunit of viral ribonucleotide reductase (RR) in pseudorabies virus which have been extensively studied in mice. However, their role in pigs has not been adequately investigated. In this study, we deleted and genes based on a / / triple gene-deleted pseudorabies virus and tested its efficacy in pigs as a vaccine candidate. The rescued virus showed similar growth properties and plaque size as its parent strain. In an animal study, the virus could elicit humoral immune responses shown by generation of gB-specific antibodies and virus neutralizing antibodies. However, vaccination could not provide protection against virulent pseudorabies virus challenge since vaccinated pigs showed clinical pseudorabies-specific syndromes. The deficiency in protection may due to the generation of late and low levels of gB antibodies and virus neutralizing antibodies.

Keywords： pseudorabies virus     RR1 and RR2     ribonucleotide reductase     vaccine candidate    

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Determination of the diffusion of poly(ethylene glycol) in polypropylene using ATR-FTIR

Hanjia CHEN, Xuhua SHI, Yafei ZHU, Yi ZHANG, Jiarui XU,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 3,   Pages 336-341 doi: 10.1007/s11705-009-0230-5

Abstract: The diffusion of poly(ethy1ene glycol) (PEG) in polypropylene (PP) was investigated using attenuated

Keywords： diffusion     polypropylene     molecular     diffusion equilibrium     attenuated    

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A concept of capillary active, dynamic insulation integrated with heating, cooling and ventilation, air conditioning system

Mark BOMBERG

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 4,   Pages 431-437 doi: 10.1007/s11709-010-0071-9

Abstract: When a historic fa?ade needs to be preserved or when the seismic considerations favor use of a concrete wall system and fire considerations limit exterior thermal insulation, one needs to use interior thermal insulation systems. Interior thermal insulation systems are less effective than the exterior systems and will not reduce the effect of thermal bridges. Yet they may be successfully used and, in many instances, are recommended as a complement to the exterior insulation. This paper presents one of these cases. It is focused on the most successful applications of capillary active, dynamic interior thermal insulation. This happens when such insulation is integrated with heating, cooling and ventilation, air conditioning (HVAC) system. Starting with a pioneering work of the Technical University in Dresden in development of capillary active interior insulations, we propose a next generation, namely, a bio-fiber thermal insulation. When completing the review, this paper proposes a concept of a joint research project to be undertaken by partners from the US (where improvement of indoor climate in exposed coastal areas is needed), China (indoor climate in non-air conditioned concrete buildings is an issue), and Germany (where the bio-fiber technology has been developed).

Keywords： capillary active insulation     integrated heating     cooling and ventilation     air conditioning (HVAC) and building enclosure    

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Synthesis and characterization of macromolecular surface modifier PP--PEG for polypropylene

CHEN Hanjia, SHI Xuhua, ZHU Yafei, ZHANG Yi, XU Jiarui

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1,   Pages 102-108 doi: 10.1007/s11705-008-0018-z

Abstract: The results of attenuated total reflectance FTIR spectroscopy (ATR-FTIR) showed that PP--PEG could diffuse

Keywords： polypropylene     crystallization capacity     attenuated     hydrophilicity     reflectance    

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Acoustic localization with multi-layer isogradient sound speed profile using TDOA and FDOA Research Article

Dongzhou ZHAN, Sitian WANG, Shougui CAI, Huarong ZHENG, Wen XU,wxu@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 1,   Pages 164-175 doi: 10.1631/FITEE.2100398

Abstract: In the underwater medium, the speed of sound varies with water depth, temperature, and salinity.The inhomogeneity of water leads to bending of sound rays, making the existing localization algorithmsThen, the sound ray tracking problem is converted into a polynomial root-searching problem.the traditional straight-line propagation method, the proposed algorithm can effectively handle the sound

Keywords： Underwater acoustic sensor network     Acoustic localization     Sound speed profile     Time difference of arrival    

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Attenuation mechanism of

Yuanqiang ZHENG,Yanchun SHI,Chang AN,Ruisheng LI,Dongjun LIU,Yuehua KE,Kairong MAO,Mingjuan YANG,Zeliang CHEN,Shorgan BOU

Frontiers of Agricultural Science and Engineering 2014, Volume 1, Issue 4,   Pages 331-340 doi: 10.15302/J-FASE-2014032

Abstract: The current licensed attenuated vaccines for animal use were developed by sequential passage in non-natural

Keywords： Brucella     live attenuated vaccine     attenuation     differential diagnosis    

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3D finite element analysis of composite noise barrier constructed of polyurethane products

Ben DAEE,Hesham El NAGGAR

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 1,   Pages 100-110 doi: 10.1007/s11709-016-0364-8

Abstract: This paper presents a numerical investigation on the structural performance of an innovative noise barrier consisting of poly-block, rigid polyurethane foam (RPF) and polyurea. The mechanical characteristics of RPF as well as the flexural resistance of the proposed wall system (poly-wall) were established and presented in another study. The experimental results are used in the current study to develop, calibrate and verify 3D finite element (FE) models of the wall system. The components of the poly-wall including steel rebars, poly-blocks and RPF cores were simulated and then verified using the results of experiments conducted on the wall components. The results of numerical analysis exhibited a satisfactory agreement with the experimental outcomes for the entire wall system. The verified numerical models were then used to conduct a parametric study on the performance of poly-wall models under uniform wind load and gravity load. The findings of the current study confirmed that the structural performance of poly-wall is satisfactory for noise barrier application. Simulation techniques for improvement of the numerical analysis of multi-martial 3D FE models were discussed.

Keywords： 3D finite element     sound wall     rigid polyurethane foam     poly-wall     numerical model     calibration    

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Progress in Study of Standard Room/Corner Fire Test of Lining Materials on Enclosure

Yang Yun,Zhang Heping,Liu Jiyang

Strategic Study of CAE 2003, Volume 5, Issue 4,   Pages 55-60

Abstract: It's mainly used to evaluate lining materials on enclosure.

Keywords： lining materials     full-scale     ISO 9705     room/corner fire test    

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Perspective: Acoustic Metamaterials in Future Engineering Perspective

Qiangbing Lu, Xin Li, Xiujuan Zhang, Minghui Lu, Yanfeng Chen

Engineering 2022, Volume 17, Issue 10,   Pages 22-30 doi: 10.1016/j.eng.2022.04.020

Abstract: These interesting properties offer novel means for sound manipulation and thus have drawn a great dealdevelopments in AMMs with a focus on their future engineering, especially in the most promising fields of sound

Keywords： Acoustic metamaterials     Sound absorption/isolation     Acoustic imaging     Engineering application    

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Design of noise-reduction seats for high-speed trains

Xiaojun DENG, Yanju ZHAO, Haijin ZHANG, Renzhong SHUAI, Leiwei ZHU

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 3,   Pages 385-389 doi: 10.1007/s11465-017-0438-x

Abstract: First, before the noise-reduction seat models were fabricated, the parameters of high-performance sound-absorbingThe sound-absorption effects of the noise-reduction seats and normal seats were investigated and comparedshowed that, compared with normal seats, the noise-reduction seats obtained a significantly improved sound-absorption

Keywords： high-speed train     sound-absorbing materials     perforated board     noise-reduction seats    

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Title Author Date Type Operation

Noise control technology for generator sets in enclosures

ZHANG Nailong, YANG Wentong, FEI Renyuan

Journal Article

Analysis of Sound Radiation of Two ConnectedElastic Rectangular Enclosure

Yao Haoping,Zhang Jianrun,Chen Nan,Sun Qinghong

Journal Article

From dBA to soundscape indices: Managing our sound environment

Jian KANG

Journal Article

Numerical study on natural convection in a square enclosure containing a rectangular heated cylinder

Jianhua LU, Zhaoli GUO, Zhenhua CHAI, Baochang SHI,

Journal Article

From understanding to designing soundscapes

Jian KANG

Journal Article

RR1 and RR2 gene deletion affects the immunogenicity of a live attenuated pseudorabies

Shijun YAN,He YAN,Chaolin ZHANG,Tongyan WANG,Qingyuan YANG,Zhe SUN,Yan XIAO,Feifei TAN,Xiangdong LI,Kegong TIAN

Journal Article

Determination of the diffusion of poly(ethylene glycol) in polypropylene using ATR-FTIR

Hanjia CHEN, Xuhua SHI, Yafei ZHU, Yi ZHANG, Jiarui XU,

Journal Article

A concept of capillary active, dynamic insulation integrated with heating, cooling and ventilation, air conditioning system

Mark BOMBERG

Journal Article

Synthesis and characterization of macromolecular surface modifier PP--PEG for polypropylene

CHEN Hanjia, SHI Xuhua, ZHU Yafei, ZHANG Yi, XU Jiarui

Journal Article

Acoustic localization with multi-layer isogradient sound speed profile using TDOA and FDOA

Dongzhou ZHAN, Sitian WANG, Shougui CAI, Huarong ZHENG, Wen XU,wxu@zju.edu.cn

Journal Article

Attenuation mechanism of

Yuanqiang ZHENG,Yanchun SHI,Chang AN,Ruisheng LI,Dongjun LIU,Yuehua KE,Kairong MAO,Mingjuan YANG,Zeliang CHEN,Shorgan BOU

Journal Article

3D finite element analysis of composite noise barrier constructed of polyurethane products

Ben DAEE,Hesham El NAGGAR

Journal Article

Progress in Study of Standard Room/Corner Fire Test of Lining Materials on Enclosure

Yang Yun,Zhang Heping,Liu Jiyang

Journal Article

Perspective: Acoustic Metamaterials in Future Engineering

Qiangbing Lu, Xin Li, Xiujuan Zhang, Minghui Lu, Yanfeng Chen

Journal Article

Design of noise-reduction seats for high-speed trains

Xiaojun DENG, Yanju ZHAO, Haijin ZHANG, Renzhong SHUAI, Leiwei ZHU

Journal Article