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Analysis of the dynamic hysteresis characteristic of finger seal

LEI Yanni, CHEN Guoding

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 32-36 doi: 10.1007/s11465-007-0005-y

Abstract: The research about hysteresis characteristic of finger seal (FS), which was carried out based on theA mass spring damper dynamics model of FS system was proposed and the hysteresis characteristic of theThis work shows that the dynamics characteristic analysis of the FS is necessary and the dynamics model

Keywords： FS     necessary     hysteresis characteristic     optimization     spring    

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Development and applications of functional gene microarrays in the analysis of the functional diversity

Zhili HE, Joy D. VAN NOSTRAND, Ye DENG, Jizhong ZHOU

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 1,   Pages 1-20 doi: 10.1007/s11783-011-0301-y

Abstract: Functional gene arrays (FGAs) are a special type of microarrays containing probes for key genes involvedin microbial functional processes, such as biogeochemical cycling of carbon, nitrogen, sulfur, phosphorusSeveral generations of GeoChip have been developed and applied to investigate the functional diversity

Keywords： functional gene arrays (FGAs)     GeoChip     microbial communities     functional diversity/composition/structure    

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Flow characteristic and wastewater treatment performance of a pilot-scale airlift oxidation ditch

Hongtao PANG, Hanchang SHI, Huiming SHI,

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 4,   Pages 470-476 doi: 10.1007/s11783-009-0143-z

Abstract: diffuser and baffle as aerator was operated in a wastewater treatment plant (WWTP) to investigate its flow characteristic

Keywords： airlift oxidation ditch     flow characteristic     wastewater treatment    

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Weak characteristic information extraction from early fault of wind turbine generator gearbox

Xiaoli XU, Xiuli LIU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 357-366 doi: 10.1007/s11465-017-0423-4

Abstract:

Given the weak early degradation characteristic information during early fault evolution in gearboxA weak characteristic information extraction based on µ-SVD and local mean decompositionExperimental results show that this method can significantly weaken signal noise, effectively extract the weak characteristic

Keywords： wind turbine generator gearbox     µ-singular value decomposition     local mean decomposition     weak characteristic    

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Fluorescent probes and functional materials for biomedical applications

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 10,   Pages 1425-1437 doi: 10.1007/s11705-022-2163-1

Abstract: Here, we highlight examples of fluorescent probes and functional materials for biological applications

Keywords： fluorescent probes     imaging     cell     biomedicine     biomolecules    

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Development Strategy for Advanced Copper-Based Materials in China

Mi Xujun , Lou Huafen , Xie Haofeng , Mo Yongda , Zhang Wenjing , Xiang Chaojian

Strategic Study of CAE 2023, Volume 25, Issue 1,   Pages 96-103 doi: 10.15302/J-SSCAE-2023.01.006

Abstract: telecommunications, and integrated circuits owing to their comprehensive advantages in mechanical, functional

Keywords： advanced copper-based materials     functional characteristic     high-tech manufacturing     copper milling industry    

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Fractal characteristic evaluation and interpolation reconstruction for surface topography of drilled

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4,   Pages 840-854 doi: 10.1007/s11465-021-0643-5

Abstract: In this paper, an improved fractal interpolation model is proposed to reconstruct the surface topography of composite hole wall. This model adopts the maximum positive deviations and maximum negative deviations between the measured values and trend values to determine the contraction factors. Hole profiles in 24 directions are measured. Fractal parameters are calculated to evaluate the measured surface profiles. The maximum and minimum fractal dimension of the hole wall are 1.36 and 1.07, whereas the maximum and minimum fractal roughness are 4.05 × 10 −5 and 4.36 × 10 −10 m, respectively. Based on the two-dimensional evaluation results, three-dimensional surface topographies in five typical angles (0°, 45°, 90°, 135°, and 165°) are reconstructed using the improved model. Fractal parameter D s and statistical parameters Sa, Sq, and Sz are used to evaluate the reconstructed surfaces. Average error of D s, Sa, Sq, and Sz between the measured surfaces and the reconstructed surfaces are 1.53%, 3.60%, 5.60%, and 9.47%, respectively. Compared with the model in published literature, the proposed model has equal reconstruction effect in relatively smooth surface and is more advanced in relatively rough surface. Comparative results prove that the proposed model for calculating contraction factors is more reasonable.

Keywords： surface topography     fractal evaluation     fractal interpolation     reconstruction     composite    

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Operating characteristic analysis on the ultra-thin low temperature floor-heating system

Hualing ZHANG, Xiaopeng SONG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 127-132 doi: 10.1007/s11709-013-0200-3

Abstract: However, there is a lack of operating characteristic research in this region, especially the energy consumption

Keywords： ultra-thin floor heating panel     the preheating time     thermal comfort     energy saving    

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Temporal dimension and water quality control in an emission trading scheme based on water environmental functional

Zhaoxing HAN, Zhenyao SHEN, Yongwei GONG, Qian HONG

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 1,   Pages 119-129 doi: 10.1007/s11783-011-0272-z

Abstract: Water environmental functional zone (WEFZ) is used to determine the water quality standard and identifyA water quality-control scheme was suggested based on the water quality requirement in the water functional

Keywords： emission trading     water functional zone     water quality control    

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Design and characteristic research of a novel electromechanical-hydraulic hybrid actuator with two transmission

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-022-0735-x

Abstract: Servo-hydraulic actuators (SHAs) are widely used in mechanical equipment to drive heavy-duty mechanisms. However, their energy efficiency is low, and their motion characteristics are inevitably affected by uncertain nonlinearities. Electromechanical actuators (EMAs) possess superior energy efficiency and motion characteristics. However, they cannot easily drive heavy-duty mechanisms because of weak bearing capacity. This study proposes and designs a novel electromechanical-hydraulic hybrid actuator (EMHA) that integrates the advantages of EMA and SHA. EMHA mainly features two transmission mechanisms. The piston of the hydraulic transmission mechanism and the ball screw pair of the electromechanical transmission mechanism are mechanically fixed together through screw bolts, realizing the integration of two types of transmission mechanisms. The control scheme of the electromechanical transmission mechanism is used for motion control, and the hydraulic transmission mechanism is used for power assistance. Then, the mathematical model, structure, and parameter design of the new EMHA are studied. Finally, the EMHA prototype and test platform are manufactured. The test results prove that the EMHA has good working characteristics and high energy efficiency. Compared with the valve-controlled hydraulic cylinder system, EMHA exhibits a velocity tracking error and energy consumption reduced by 49.7% and 54%, respectively, under the same working conditions.

Keywords： electromechanical-hydraulic hybrid actuator (EMHA)     integration     transmission mechanisms     power assistance     energy efficiency     working characteristics    

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Mesh relationship modeling and dynamic characteristic analysis of external spur gears with gear wear

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 1,   Pages 9-9 doi: 10.1007/s11465-021-0665-z

Abstract: Gear wear is one of the most common gear failures, which changes the mesh relationship of normal gear. A new mesh relationship caused by gear wear affects meshing excitations, such as mesh stiffness and transmission error, and further increases vibration and noise level. This paper aims to establish the model of mesh relationship and reveal the vibration characteristics of external spur gears with gear wear. A geometric model for a new mesh relationship with gear wear is proposed, which is utilized to evaluate the influence of gear wear on mesh stiffness and unloaded static transmission error (USTE). Based on the mesh stiffness and USTE considering gear wear, a gear dynamic model is established, and the vibration characteristics of gear wear are numerically studied. Comparison with the experimental results verifies the proposed dynamic model based on the new mesh relationship. The numerical and experimental results indicate that gear wear does not change the structure of the spectrum, but it alters the amplitude of the meshing frequencies and their sidebands. Several condition indicators, such as root-mean-square, kurtosis, and first-order meshing frequency amplitude, can be regarded as important bases for judging gear wear state.

Keywords： gear wear     mesh relationship     mesh stiffness     transmission error     vibration characteristics    

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A Study of the Functional Mechanism of Petrochemical Engineering Construction Project Management

Ji-ming Wang

Frontiers of Engineering Management 2014, Volume 1, Issue 2,   Pages 129-139 doi: 10.15302/J-FEM-2014020

Abstract: This paper, proceeding from the project construction process, the management mode and the implementation way, makes an in-depth study of the environmental characteristics and the managerial elements of petrochemical engineering construction project, revealing the inherent laws, establishing a theoretical model, and proposing a theory of the mechanisms of construction project management; and presents profound revelations found for construction project management in petrochemical engineering in seven aspects, which can play a guiding role in improving the managerial performance of petrochemical construction project. The theory established proposes that: The construction project management in petrochemical engineering is a complex systematic process, formed of 5 phases and 55 sub-processes of management, and exposed to many factors of influence; the environmental characteristics and managerial elements exercise positive impacts on managerial performance, but different factors have different impacts and act in different ways on managerial performance; the managerial elements of petrochemical engineering construction project are tiered, transferable, systematic and quantifiable, and the role of managerial elements in the managerial performance can be systematically integrated, quantitatively explained and transferred in a multi-level way.

Keywords： petrochemical engineering     construction project     project management     functional mechanism    

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Effects of functional groups for CO

Chenkai Gu, Yang Liu, Weizhou Wang, Jing Liu, Jianbo Hu

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 2,   Pages 437-449 doi: 10.1007/s11705-020-1961-6

Abstract: Functional groups on organic linkers of MOFs play important roles in improving the CO capture abilityfunctionalization effects on CO adsorption were systematically investigated by rationally incorporating various functionalIn addition, three kinds of molecular interactions between CO and functional groups were analyzed andEspecially, our results reveal that –SO H is the best-performing functional group for CO capture in

Keywords： metal-organic frameworks     functional groups     CO2 capture     GCMC     DFT    

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Microbial community and functional genes in the rhizosphere of alfalfa in crude oil-contaminated soil

Yi ZHONG, Jian WANG, Yizhi SONG, Yuting LIANG, Guanghe LI

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 6,   Pages 797-805 doi: 10.1007/s11783-012-0405-z

Abstract: vegetated with alfalfa ( L.) to evaluate the rhizosphere effects on the soil microbial population and functionalIn total, 796, 731, and 379 functional genes were detected by microarray in the AR, FR, and NR, respectivelyHigher proportions of functional genes related to carbon degradation and organic remediation, were foundwith NR soil, suggesting that the rhizosphere selectively increased the abundance of these specific functionalanalysis showed that salinity was the most important environmental factor influencing the microbial functional

Keywords： crude oil-contaminated soil     phytoremediation     rhizosphere effects     rhizobox     functional genes    

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Macro-architectured cellular materials: Properties, characteristic modes, and prediction methods

Zheng-Dong MA

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 3,   Pages 442-459 doi: 10.1007/s11465-018-0488-8

Abstract: The characteristic modes and the stress recovery process used to predict the stress distribution inside

Keywords： architectured material     cellular materials     multi-scale modeling     homogenization method     effective material properties     computational method    

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Title Author Date Type Operation

Analysis of the dynamic hysteresis characteristic of finger seal

LEI Yanni, CHEN Guoding

Journal Article

Development and applications of functional gene microarrays in the analysis of the functional diversity

Zhili HE, Joy D. VAN NOSTRAND, Ye DENG, Jizhong ZHOU

Journal Article

Flow characteristic and wastewater treatment performance of a pilot-scale airlift oxidation ditch

Hongtao PANG, Hanchang SHI, Huiming SHI,

Journal Article

Weak characteristic information extraction from early fault of wind turbine generator gearbox

Xiaoli XU, Xiuli LIU

Journal Article

Fluorescent probes and functional materials for biomedical applications

Journal Article

Development Strategy for Advanced Copper-Based Materials in China

Mi Xujun , Lou Huafen , Xie Haofeng , Mo Yongda , Zhang Wenjing , Xiang Chaojian

Journal Article

Fractal characteristic evaluation and interpolation reconstruction for surface topography of drilled

Journal Article

Operating characteristic analysis on the ultra-thin low temperature floor-heating system

Hualing ZHANG, Xiaopeng SONG

Journal Article

Temporal dimension and water quality control in an emission trading scheme based on water environmental functional

Zhaoxing HAN, Zhenyao SHEN, Yongwei GONG, Qian HONG

Journal Article

Design and characteristic research of a novel electromechanical-hydraulic hybrid actuator with two transmission

Journal Article

Mesh relationship modeling and dynamic characteristic analysis of external spur gears with gear wear

Journal Article

A Study of the Functional Mechanism of Petrochemical Engineering Construction Project Management

Ji-ming Wang

Journal Article

Effects of functional groups for CO

Chenkai Gu, Yang Liu, Weizhou Wang, Jing Liu, Jianbo Hu

Journal Article

Microbial community and functional genes in the rhizosphere of alfalfa in crude oil-contaminated soil

Yi ZHONG, Jian WANG, Yizhi SONG, Yuting LIANG, Guanghe LI

Journal Article

Macro-architectured cellular materials: Properties, characteristic modes, and prediction methods

Zheng-Dong MA

Journal Article