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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-absorbingmaterials and perforated plates were selected by conducting a standing-wave tube test.The 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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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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Characteristics and application of road absorbing solar energy

Zhihua ZHOU, Shan HU, Xiaoyan ZHANG, Jian ZUO

Frontiers in Energy 2013, Volume 7, Issue 4, Pages 525-534 doi: 10.1007/s11708-013-0278-2

Abstract: If the heat of road surface can be stored in summer, the road surface temperature will be decreased to prevent permanent deformation of pavement. Besides, if the heat stored is released, it can supply heat for buildings or raise the road surface temperature for snow melting in winter. A road-solar energy system was built in this study, and the heat transfer mechanism and effect of the system were analyzed according to the monitored solar radiant heat, the solar energy absorbed by road and the heat stored by soil. The results showed that the road surface temperature was mainly affected by solar radiation, but the effect is hysteretic in nature. The temperature of the solar road surface was 3°C–6°C lower than that of the ordinary road surface. The temperature of the solar road along the vertical direction was 2°C–5°C lower than that of the ordinary road. The temperature difference increased as the distance to the heat transfer tubes decreased. The average solar collector efficiency of the system was 14.4%, and the average solar absorptivity of road surface was 36%.

Keywords： solar energy road-solar energy system road surface temperature solar absorptivity of road surface solar collector efficiency of system

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Preparation of solar selective absorbing CuO coating for medium temperature application

HUANG Qunwu, WANG Yiping, LI Jinhua

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3, Pages 256-260 doi: 10.1007/s11705-007-0046-0

Abstract: A new method of preparing CuO solar selective absorbing coating for medium temperature is presented.

Keywords： photoelectron spectroscopy temperature pretreatment absorptivity microscopy

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Entropy flow, entropy generation, exergy flux, and optimal absorbing temperature in radiative transfer

Zeshao CHEN, Songping MO, Peng HU, Shouli JIANG, Gang WANG, Xiaofang CHENG,

Frontiers in Energy 2010, Volume 4, Issue 3, Pages 301-305 doi: 10.1007/s11708-010-0006-0

Abstract: The formulas of entropy flow, entropy generation, exergy flux, and optimal temperature of absorbing surface

Keywords： radiative heat transfer entropy generation exergy thermodynamics

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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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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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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 convenient

Keywords： equipment generator sound-attenuated enclosure convenient Enclosure development

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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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Preparation and properties of a silver particle-coated and 1-dodecanethiol-modified superhydrophobic melamine sponge for oil/water separation

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 8, Pages 1237-1246 doi: 10.1007/s11705-022-2140-8

Abstract: A Ag particle-coated and 1-dodecanethiol-modified melamine sponge (Ag-DDT-MS) was prepared through surface roughness by coating silver particles and subsequent grafting of a hydrophobic long hydrocarbon chain. Superhydrophobic and 3D porous Ag-DDT-MS was characterized by Fourier transform infrared spectroscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The water contact angle of Ag-DDT-MS reached 159.2°. Ag-DDT-MS exhibited excellent absorption capacity for high viscous oils and organic solvents, ranging from 42.8 to 105.2 g∙g⁻¹. The absorbed oils can be easily collected by the mechanical pressing process, and the oil recovery rate was satisfactory, more than 90% after 20 recycles. Ag-DDT-MS material also demonstrated good stability and excellent compression-recovery ability, keeping 88.6% of the initial height after ten compression-release cycles.

Keywords： melamine sponge oil-absorbing material hydrophobic oil-water separation oil absorption capacity

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Thoughts on Scientific Issues in Engineering Material Research

yuqiao

Strategic Study of CAE 1999, Volume 1, Issue 3, Pages 1-4

Abstract:

On a lot of occasons in aerospace engineering, materials work in extreme situastions.Specific characteristics of materials are therefore required.All of these belong to the response of materials to high speed collision.Electromagnetic materials suchDifferent EM functioning materials possess different macroproperties of physical parameters.provide a scientific basis for materials design and innovation.

Keywords： material for radome wave absorbing material infrared stealth material EMC material

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cattering-absorbing method for the detection of 16.7 MeV high-energy pulsed gamma

Tan Xinjian,Ouyang Xiaoping,Wang Qunshu

Strategic Study of CAE 2009, Volume 11, Issue 8, Pages 48-51

Abstract: paper proposes a new method of diagnosing 16.7 MeV high-energy pulsed gamma, named "scattering-absorbing

Keywords： high-energy gamma Cherenkov detector scattering absorption method

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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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Hierarchically porous zeolites synthesized with carbon materials as templates

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 6, Pages 1444-1461 doi: 10.1007/s11705-021-2090-6

Abstract: From both industrial and scientific perspectives, different carbon materials have been widely employedIn this review, the progress in synthetic strategies using carbon materials as templates is comprehensivelyDirect templates methods, by which the carbon materials are directly mixed with precursors gel as hard

Keywords： hierarchical zeolites carbon materials direct templates indirect templates carbon-silica composites

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Influence of envelope insulation materials on building energy consumption

Junlan YANG, Jiabao TANG

Frontiers in Energy 2017, Volume 11, Issue 4, Pages 575-581 doi: 10.1007/s11708-017-0473-7

Abstract: In this paper, the influence of different external wall insulation materials on the energy consumptionThree types of insulation materials commonly used in Germany including mineral fiber, polyurethane, andenergy analysis model is established to clarify the primary energy use for production of the insulation materialsThe ascending order of the total energy consumption of the three materials is mineral fiber, polyurethaneHowever, the optimum insulation thicknesses for the three insulation materials show a verse order at

Keywords： building envelope insulation materials energy consumption payback time