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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: reduce noise.In this study, a new noise-reduction seat design was proposed for high-speed trains, which have uniqueFirst, before the noise-reduction seat models were fabricated, the parameters of high-performance sound-absorbingFinally, the noise-reduction seats were fabricated and installed in a full train car of an actual high-speednoise level at a standard point in the passenger car by 1.5 dB.

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

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Application of python-based Abaqus preprocess and postprocess technique in analysis of gearbox vibration and noise

Guilian YI, Yunkang SUI, Jiazheng DU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2, Pages 229-234 doi: 10.1007/s11465-011-0128-z

Abstract:

To reduce vibration and noise, a damping layer and constraint layer are usually pasted on the innersurface of a gearbox thin shell, and their thicknesses are the main parameters in the vibration and noisepoint, and the normal accelerations of different points can reflect the degree of the vibration and noisecomprehensive index of the vibration characteristics of the whole structure, and the vibration acceleration levelis adopted to measure the degree of the vibration and noise.

Keywords： Abaqus secondary development Python language vibration and noise reduction K-S function vibration accelerationlevel

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Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely noisy ambient vibration tests in Shiraz-Iran

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2, Pages 446-472 doi: 10.1007/s11709-019-0605-8

Abstract: The main purpose of the present study is to enhance high-level noisy data by a wavelet-based iterativeMost of denoising methods fail to filter such noise properly.Both the signal-to-noise ratio and the peak signal-to-noise ratio are small.Due to the fact that it is impossible to completely denoise such high-level noisy data, the enhancing

Keywords： ambient vibration test high level noise iterative signal enhancement wavelet cross and autocorrelation

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The carbon dioxide removal potential of Liquid Air Energy Storage: A high-level technical and economic

Andrew LOCKLEY, Ted von HIPPEL

Frontiers of Engineering Management 2021, Volume 8, Issue 3, Pages 456-464 doi: 10.1007/s42524-020-0102-8

Abstract: Liquid Air Energy Storage (LAES) is at pilot scale. Air cooling and liquefaction stores energy; reheating revaporises the air at pressure, powering a turbine or engine (Ameel et al., 2013). Liquefaction requires water & CO removal, preventing ice fouling. This paper proposes subsequent geological storage of this CO – offering a novel Carbon Dioxide Removal (CDR) by-product, for the energy storage industry. It additionally assesses the scale constraint and economic opportunity offered by implementing this CDR approach. Similarly, established Compressed Air Energy Storage (CAES) uses air compression and subsequent expansion. CAES could also add CO scrubbing and subsequent storage, at extra cost. CAES stores fewer joules per kilogram of air than LAES – potentially scrubbing more CO per joule stored. Operational LAES/CAES technologies cannot offer full-scale CDR this century (Stocker et al., 2014), yet they could offer around 4% of projected CO disposals for LAES and<25% for current-technology CAES. LAES CDR could reach trillion-dollar scale this century (20 billion USD/year, to first order). A larger, less certain commercial CDR opportunity exists for modified conventional CAES, due to additional equipment requirements. CDR may be commercially critical for LAES/CAES usage growth, and the necessary infrastructure may influence plant scaling and placement. A suggested design for low-pressure CAES theoretically offers global-scale CDR potential within a century (ignoring siting constraints) – but this must be costed against competing CDR and energy storage technologies.

Keywords： carbon dioxide removal Liquid Air Energy Storage Compressed Air Energy Storage geoengineering

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Geological Disposal of High Level Radio Active Waste：Progress and Challenges

Wang Ju

Strategic Study of CAE 2008, Volume 10, Issue 3, Pages 58-65

Abstract:

Safe disposal of high level radioactive waste is a challenging task facingThis paper introduces the latest progress of high level radioactive waste disposal programs in the worldbehaviour of deep rock mass,groundwater and engineering material under coupled conditions(intermediate to highSeveral large-scale research projects and several hot topics relating to high-level waste disposal are

Keywords： high level radioactive waste geological disposal underground research laboratory key scientific challenges

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Digital switched hydraulics

Min PAN, Andrew PLUMMER

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2, Pages 225-231 doi: 10.1007/s11465-018-0509-7

Abstract: The soft switching technology and high-speed switching valve design techniques are discussed.

Keywords： digital hydraulics switched inertance hydraulic systems energy efficiency high-speed switching valve fluid-borne noise

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The Post Occupancy Evaluation for the Auditorium of Shanghai Grand Theater

Li Daozeng,Xu Jin

Strategic Study of CAE 2001, Volume 3, Issue 1, Pages 15-21

Abstract:

The contemporary Grand Theater of international level in China was first built in Shanghai.the design intentions of the auditorium in terms of technological aspect, such as sight-line design, noiselevel control, acoustic design, the collected acoustic parameters measured from different points within

Keywords： auditorium sight-line design noise level control acoustic design the removable sound canopy the alternative

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Theoretical analysis and actual experimental research on static characteristics of suspendome structure

CHEN Zhihua, YAN Xiangyu, SUN Ruirui, FENG Zhenchang, QIN Yali, ZHAO Jianbo

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3, Pages 286-292 doi: 10.1007/s11709-007-0037-8

Abstract: and nodal displacements were compared and it showed that they accord well with each other under low-levelWhile under high-level load, the experimental value was bigger than the theoretical value due to the

Keywords： Tianjin influence displacement high-level low-level

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High Sensitive Electron-Bombarded CCD for Low Light Level Imaging

Zhou Liwei,Liu Guangrong,Gao Zhiyun,Wang Zhongchun

Strategic Study of CAE 1999, Volume 1, Issue 3, Pages 56-62

Abstract: reviews the recent developments of electron-bombarded charge coupled devices (EBCCD) for low-light-levelIt has been shown that the EBCCD image tubes offer nearly noiseless gain, high signal to noise ratioand excellent MTF and, for this reason, are superior to conventional ICCD approaches under all light levelFinaly, the present paper shows that these new, high performance devices of EBCCD are in an advantageousposition for many applications in low-light-lev-el surveillance imaging, high energy physics and medical

Keywords： low-light-level imaging charge-coupled-devices electron-bombarded

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High-level expression of recombinant IgG1 by CHO K1 platform

Ningning Xu, Jianfa Ou, Al-Karim (Al) Gilani, Lufang Zhou, Margaret Liu

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 3, Pages 376-380 doi: 10.1007/s11705-015-1531-5

Abstract: Finally, a high IgG1 production of 780 mg/L was obtained from a batch culture.This study demonstrated that the construction of high producing cell line, from gene to clone, could

Keywords： Chinese hamster ovary (CHO) monoclonal antibody IgG1 amplification cell line development

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System-level Pareto frontiers for on-chip thermoelectric coolers

Sevket U. YURUKER, Michael C. FISH, Zhi YANG, Nicholas BALDASARO, Philip BARLETTA, Avram BAR-COHEN, Bao YANG

Frontiers in Energy 2018, Volume 12, Issue 1, Pages 109-120 doi: 10.1007/s11708-018-0540-8

Abstract: This methodology also provides the possible system level Δ ’s that can be achieved for a range of heat

Keywords： thermoelectric cooling thermal management optimization high flux electronics

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Lignin-based polymer with high phenolic hydroxyl group content prepared by the alkyl chain bridging method

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 8, Pages 1075-1084 doi: 10.1007/s11705-022-2272-x

Abstract: Inspired by the importance of the phenolic group to the electron transporting property of hole transport materials, phenolic hydroxyl groups were introduced in lignosulfonate (LS) via the alkyl chain bridging method to prepare phenolated-lignosulfonate (PLS). The results showed that the phenolic group was boosted from 0.81 mmol∙g^–1 of LS to 1.19 mmol∙g^–1 of PLS. The electrochemical property results showed two oxidation peaks in the cyclic voltammogram (CV) curve of PLS, and the oxidation potential of the PLS-modified electrode decreased by 0.5 eV compared with that of LS. This result indicates that PLS is more easily oxidized than LS. Based on the excellent electron transporting property of PLS, PLS was applied as a dopant in poly(3,4-ethylenedioxythiophene) (PEDOT, called PEDOT:PLSs). PLS showed excellent dispersion properties for PEDOT. Moreover, the transmittance measurement results showed that the transmittance of PEDOT:PLSs exceeded 85% in the range of 300–800 nm. The CV results showed that the energy levels of PEDOT:PLSs could be flexibly adjusted by PLS amounts. The results indicate that the phenolic hydroxyl group of lignin can be easily boosted by the alkyl chain bridging method, and phenolated lignin-based polymers may have promising potential as dopants of PEDOT to produce hole transporting materials for different organic photovoltaic devices.

Keywords： lignosulfonate phenolic group PEDOT:PLS hole extract layer energy level

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Anovel approach of noise statistics estimate using H∞ filter in target tracking

Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 5, Pages 449-457 doi: 10.1631/FITEE.1500262

Abstract: Noise statistics are essential for estimation performance.In practical situations, however, a priori information of noise statistics is often imperfect.Previous work on noise statistics identification in linear systems still requires initial prior knowledgeof the noise.Then by applying state estimates obtained from the H∞ filter, better estimates of the noise mean and

Keywords： Noise estimate H∞ filter Target tracking

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Ambient Noise Tomography for Coral Islands Article

Shaohong Xia, Changrong Zhang, Jinghe Cao

Engineering 2023, Volume 25, Issue 6, Pages 182-193 doi: 10.1016/j.eng.2021.09.022

Abstract: We made the following findings: ① The ambient noise frequencies can be roughly categorized into threewere significant differences in the characteristics of the noise above 5 Hz. ② For ambient noise frequenciesbelow 5 Hz, cross-correlation functions with high quality could be obtained with only 24 h of waveformthe coral island was higher toward the sea and lower toward the lagoon, which was consistent with the hightwo low-velocity horizons at 25–75 and 200–300 m, which were in good agreement with the high-porosity

Keywords： Coral island Ambient noise tomography Engineering geology South China Sea

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Investigation of flow dynamics and decrease of vortex noise inside volute of centrifugal fans

LI Chunxi, WANG Songling

Frontiers in Energy 2008, Volume 2, Issue 2, Pages 235-240 doi: 10.1007/s11708-008-0040-3

Abstract: The generation, evolution, and noise of the vortex were investigated when cylinder-shaped and cone-cylinder-shapedExperimental results indicated A-sound level and spectrum noise of the refitted fan decreased and thetwo anti-vortex rings were effective in decreasing vortex noise.more effective than the cylinder-shaped one in breaking large-scale vortexes and decreasing vortex noise

Keywords： cylinder-shaped evolution computational effective large-scale

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Title Author Date Type Operation

Design of noise-reduction seats for high-speed trains

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

Journal Article

Application of python-based Abaqus preprocess and postprocess technique in analysis of gearbox vibration and noise

Guilian YI, Yunkang SUI, Jiazheng DU

Journal Article

Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely noisy ambient vibration tests in Shiraz-Iran

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Journal Article

The carbon dioxide removal potential of Liquid Air Energy Storage: A high-level technical and economic

Andrew LOCKLEY, Ted von HIPPEL

Journal Article

Geological Disposal of High Level Radio Active Waste：Progress and Challenges

Wang Ju

Journal Article

Digital switched hydraulics

Min PAN, Andrew PLUMMER

Journal Article

The Post Occupancy Evaluation for the Auditorium of Shanghai Grand Theater