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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 flowcharacteristic and wastewater treatment performance.

Keywords： airlift oxidation ditch     flow characteristic     wastewater treatment    

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Development of a novel two-stage proportional valve with a pilot digital flow distribution

Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 2,   Pages 420-434 doi: 10.1007/s11465-020-0622-2

Abstract: digitization of the traditional proportional valve, a novel two-stage proportional valve with a pilot digital flowthe fixed orifice’s diameter, a new design criterion that considers the maximum pressure sensitivity, flowcontrollability, and flow linearization is proposed to improve the balance between the effective displacementThe values can be further improved by increasing the flow rate of the pilot HSV.

Keywords： two-stage proportional valve     digital flow distribution     high-speed on/off valve     position tracking characteristic    

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Ultrasound Blood Flow Non-invasive Detection and Characteristic Extraction of the Medical Signals

Wang Weiqi,Wang Yuanyuan,Yu Jianguo,Wu Xiaofeng,Liu Bin,Zhang Yu,Chen Sizhong,Yi Yanhua,Shao Qianming

Strategic Study of CAE 2001, Volume 3, Issue 2,   Pages 52-64

Abstract: In this paper, the quantitative blood flow velocity detection using the Doppler ultrasound techniqueprocessing were introduced into the medical ultrasound field, which provided new means to extract the characteristicthe color-encoded spectrogram analyzer and the ultrasound quantitative detection system for the blood flow

Keywords： ultrasound blood flow     medical signal     non-invasive detection     characteristic extraction    

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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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Large-scale accumulation characteristic and distribution law of low porosity and permeability reservoir

Zhao Wenzhi,Wang Hongjun,Bian Congsheng,Wang Zecheng,Liu Guangdi

Strategic Study of CAE 2012, Volume 14, Issue 6,   Pages 31-39

Abstract: period and scale“exhausting gas” in uplift stage are the important gas source;the volume flowand diffusion flow filling are the main migration and accumulation modes.

Keywords： low porosity and permeability reservoir     largescale gas accumulation     volume flow     diffusion flow     “pancake    

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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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Simulation on Flow Field Characteristic of Restricted Wall-attached Jet in Heading Face

Wang Haiqiao,Liu Ronghua,Chen Shiqiang

Strategic Study of CAE 2004, Volume 6, Issue 8,   Pages 45-49

Abstract: The flow field characteristics such as the flow field zoning, the starting segment of jet, the attachingthere are four zones in heading face, i. e. wall-attached jet zone, impact jet wall-attached zone, back flow

Keywords： heading face     restricted wall-attached jet     k - ε model     numerical simulation    

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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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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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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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Numerical study of internal flow field and flow passage improvement of an inlet particle separator

Florian PAOLI, Tong WANG

Frontiers in Energy 2011, Volume 5, Issue 4,   Pages 386-397 doi: 10.1007/s11708-011-0156-8

Abstract: By performing gas flow field numerical simulations for several inlet Reynolds numbers (from 2 × 10to 9 × 10 ) and byflow ratios (from 10% to 20%), the present study has proposed to improve the flowNo particle has been included in the gas flow for a -epsilon turbulence model.Then the flow passage improvement method has focused on the separation area.in this study has succeeded in designing a shape which enhances the flow behavior.

Keywords： streamlines     pressure losses     flow passage improvement     inlet particle separator (IPS)    

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Gas dynamic characteristic of displacer in Stirling cryocoolers

LIU Xinguang, LIU Dongyu, WANG Yong, WU Yinong

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 499-503 doi: 10.1007/s11708-008-0090-6

Abstract: Based on the vector analysis of the dynamic characteristic of the displacer in split-type Stirling cryocoolers
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The Pendulum Characteristic of Natural Convection Gas and the Application for Sensor

Zhang Fuxue

Strategic Study of CAE 2002, Volume 4, Issue 8,   Pages 50-53

Abstract:

It is discovered that the natural convection gas has the pendulum characteristic, so the new concept

Keywords： gas pendulum characteristic     tilt sensor     accelerometer    

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Title Author Date Type Operation

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

Hongtao PANG, Hanchang SHI, Huiming SHI,

Journal Article

Development of a novel two-stage proportional valve with a pilot digital flow distribution

Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG

Journal Article

Ultrasound Blood Flow Non-invasive Detection and Characteristic Extraction of the Medical Signals

Wang Weiqi,Wang Yuanyuan,Yu Jianguo,Wu Xiaofeng,Liu Bin,Zhang Yu,Chen Sizhong,Yi Yanhua,Shao Qianming

Journal Article

Analysis of the dynamic hysteresis characteristic of finger seal

LEI Yanni, CHEN Guoding

Journal Article

Large-scale accumulation characteristic and distribution law of low porosity and permeability reservoir

Zhao Wenzhi,Wang Hongjun,Bian Congsheng,Wang Zecheng,Liu Guangdi

Journal Article

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

Xiaoli XU, Xiuli LIU

Journal Article

Simulation on Flow Field Characteristic of Restricted Wall-attached Jet in Heading Face

Wang Haiqiao,Liu Ronghua,Chen Shiqiang

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

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

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

Zheng-Dong MA

Journal Article

Numerical study of internal flow field and flow passage improvement of an inlet particle separator

Florian PAOLI, Tong WANG

Journal Article

Gas dynamic characteristic of displacer in Stirling cryocoolers

LIU Xinguang, LIU Dongyu, WANG Yong, WU Yinong

Journal Article

The Pendulum Characteristic of Natural Convection Gas and the Application for Sensor

Zhang Fuxue

Journal Article