Resource Type

Journal Article 1049

Year

2023 72

2022 80

2021 69

2020 73

2019 51

2018 45

2017 46

2016 43

2015 54

2014 50

2013 40

2012 44

2011 36

2010 49

2009 49

2008 43

2007 39

2006 28

2005 30

2004 22

open ︾

Keywords

model 15

model test 15

numerical simulation 15

mathematical model 14

kinetic model 10

optimization 10

COVID-19 7

uncertainty 7

Deep learning 6

sensitivity analysis 6

constitutive model 5

China 4

Machine learning 4

development model 4

numerical model 4

parameter optimization 4

sustainable development 4

FEM 3

artificial neural network 3

open ︾

Search scope:

排序： Display mode:

Performance design of a cryogenic air separation unit for variable working conditions using the lumpedparameter model

Jinghua XU, Tiantian WANG, Qianyong CHEN, Shuyou ZHANG, Jianrong TAN

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1,   Pages 24-42 doi: 10.1007/s11465-019-0558-6

Abstract: A lumped parameter model (LPM) of ASU is proposed by lumping the main factors together and simplifyingOn the basis of material and energy conservation laws, the piecewise-lumped parameters are extractedunder variable working conditions by using LPM.Compared with the traditional method, LPM is particularly suitable for “rough first then precise” modelingWith LPM, the performance of the air compressor, molecular sieve adsorber, turbo expander, main plate-fin

Keywords： performance design     air separation unit (ASU)     lumped parameter model (LPM)     variable working conditions    

HTML PDF Collect

Analysis of the current situation of environmental policy of China and establishment of distributed environmental policy framework

Chaoyang FU,Wangfeng LI

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 2,   Pages 310-316 doi: 10.1007/s11783-014-0658-9

Abstract: In this study, China’s current macro-environmental policies as well as their implementation and management tools are analyzed. By using the basic economic methodology, detailed studies are conducted focusing on the implementation effect of contemporary China’s typical environmental policy of the total pollutant discharge quantity control type, and also the two types of environmental management tools are compared from the perspective of implementation costs and policy uncertainty. By introduction of distributed management tools into the implementation of environmental policies, market-oriented means and the methods of economic analysis are introduced into environmental policy decision-making mechanisms, which could afford a new method for changing the current relatively low efficiency of environmental policy, solving the problem of “government failure” in environmental policy implementation, and providing a new way to make environmental policy system more flexible and more efficient. It is of great practical significance to solve China's current structural, complex and accumulative environmental problems.

Keywords： environmental policy     distributed environment policy     distributed parameter model     lumped parameter model    

HTML PDF Collect

Shallow foundation response variability due to soil and model parameter uncertainty

Prishati RAYCHOWDHURY,Sumit JINDAL

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 3,   Pages 237-251 doi: 10.1007/s11709-014-0242-1

Abstract: The present work intends to investigate the effect of soil and model parameter uncertainty on the responseThe sensitivity of both soil and model input parameters on shallow foundation responses are investigatedhighly sensitive soil parameters, such as friction angle, Poisson’s ratio and shear modulus, rather than model

Keywords： shallow foun dation     sensitivity analysis     centrifuge data     first-order-second-moment (FOSM) method     parameter    

HTML PDF Collect

Predictor-corrector algorithm for solving quasi-separated-flow and transient distributed-parameter model

Ping ZHANG, Guoliang DING

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 535-541 doi: 10.1007/s11708-010-0113-y

Abstract: stitution (SS) method is a suitable approach to solving the transient distributed-parameter model for

Keywords： algorithm     convergence     heat exchanger     modeling     transient    

HTML PDF Collect

Kinematic Model Building and Servo Parameter Identification of 3-HSS Parallel Mechanism

YANG Zhi-yong, WU Jiang, HUANG Tian, NI Yan-bing

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 1,   Pages 60-66 doi: 10.1007/s11465-005-0019-2

Abstract:

Aiming at a parallel mechanism with three degrees of freedom, a method for dynamic model buildingand the parameter identification of its servosystem is presented.position, velocity, and acceleration of parallelogram branch structure are deduced, and then, its dynamic modelBased on the above model, a method to identify the servo parameter of the parallel mechanism is put upinput with variable frequency is adopted to offset the disadvantages of pseudorandom number sequence in parameter

Keywords： building     acceleration     additive     workspace     optimum performance    

HTML PDF Collect

Probabilistic model for vessel-bridge collisions in the Three Gorges Reservoir

Bo GENG , Hong WANG , Junjie WANG ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 279-285 doi: 10.1007/s11709-009-0044-z

Abstract: over the Yangtze River in the Three Gorges Reservoir, and an analysis of the geometric probabilistic modelvessels in collision probability calculation, the aberrancy angle and vessel velocity probabilistic modelrelated with impact force, a probabilistic model is established and also verified by goodness-of-fitThe vessel transit path distribution can be expressed by the normal distribution model.The aberrancy angle distribution of vessels accepts maximum I distribution model, and its distribution

Keywords： vessel-bridge collision     probabilistic model     parameter statistics    

HTML PDF Collect

The formation mechanism and the influence factor of residual stress in machining

Zhaoxu QI,Bin LI,Liangshan XIONG

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 3,   Pages 265-269 doi: 10.1007/s11465-014-0311-0

Abstract: On the basis of the analytical model for residual stress, a series of simulations for residual stress

Keywords： residual stress     analytical model     strain     plastic     cutting parameter    

HTML PDF Collect

Ambient vibration testing and updating of the finite element model of a simply supported beam bridge

Ivan Gomez ARAUJO, Esperanza MALDONADO, Gustavo Chio CHO

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 344-354 doi: 10.1007/s11709-011-0124-8

Abstract: ambient vibration test on a concrete bridge constructed in 1971 and calibration of its finite element modelThen, these characteristics were used to update the finite element model of the bridge by formulatingtransverse; and these experimentally obtained dynamic characteristics were also achieved in the analytical modeloptimization techniques showed great versatility to optimize any number and type of variables in the model

Keywords： modal analysis     parameter identification     ambient vibration test     Eigensystem Realization Algorithm (ERA    

HTML PDF Collect

Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0703-5

Abstract: In fiber laser beam welding (LBW), the selection of optimal processing parameters is challenging and plays a key role in improving the bead geometry and welding quality. This study proposes a multi-objective optimization framework by combining an ensemble of metamodels (EMs) with the multi-objective artificial bee colony algorithm (MOABC) to identify the optimal welding parameters. An inverse proportional weighting method that considers the leave-one-out prediction error is presented to construct EM, which incorporates the competitive strengths of three metamodels. EM constructs the correlation between processing parameters (laser power, welding speed, and distance defocus) and bead geometries (bead width, depth of penetration, neck width, and neck depth) with average errors of 10.95%, 7.04%, 7.63%, and 8.62%, respectively. On the basis of EM, MOABC is employed to approximate the Pareto front, and verification experiments show that the relative errors are less than 14.67%. Furthermore, the main effect and the interaction effect of processing parameters on bead geometries are studied. Results demonstrate that the proposed EM-MOABC is effective in guiding actual fiber LBW applications.

Keywords： laser beam welding     parameter optimization     metamodel     multi-objective    

HTML PDF Collect

Variable stiffness and damping magnetorheological isolator

Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 310-315 doi: 10.1007/s11465-009-0039-4

Abstract: The parameters of the model under various magnetic fields are identified, and the dynamic performance

Keywords： magnetorheological (MR) fluid     stiffness     damping     mathematical model     dynamic performance     parameter identification    

HTML PDF Collect

Determination of effective stress parameter of unsaturated soils: A Gaussian process regression approach

Pijush Samui, Jagan J

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 133-136 doi: 10.1007/s11709-013-0202-1

Abstract: article examines the capability of Gaussian process regression (GPR) for prediction of effective stress parametervolumetric water content ( ), residual water content ( ), bubbling pressure ( ), suction ( ) and fitting parameterA sensitivity analysis has been done to determine the effect of each input parameter on .The results show that the developed GPR is reliable model for prediction of of unsaturated soil.

Keywords： unsaturated soil     effective stress parameter     Gaussian process regression (GPR)     artificial neural network    

HTML PDF Collect

1000 MW ultra-supercritical turbine steam parameter optimization

FENG Weizhong

Frontiers in Energy 2008, Volume 2, Issue 2,   Pages 187-193 doi: 10.1007/s11708-008-0030-5

Abstract: The 2 × 1000 MW ultra-supercritical steam turbine of Shanghai Waigaoqiao Phase III project, which uses grid frequency regulation and overload control through an overload valve, is manufactured by Shanghai Turbine Company using Siemens technology. Through optimization, the steam pressure is regarded as the criterion between constant pressure and sliding pressure operation. At high circulating water temperature, the turbine overload valve is kept closed when the unit load is lower than 1000 MW while at other circulating water temperatures the turbine can run in sliding pressure operation when the unit load is higher than 1000 MW and the pressure is lower than 27 MPa This increases the unit operation efficiency. The 3D bending technology in the critical piping helps to reduce the project investment and minimize the reheat system pressure drop which improves the unit operation efficiency and safety. By choosing lower circulating water design temperature and by setting the individual Boiler Feedwater Turbine condenser to reduce the exhaust steam flow and the heat load to the main condenser, the unit average back pressure and the terminal temperature difference are minimized. Therefore, the unit heat efficiency is increased.
HTML PDF Collect

An Evaluation Model for the Coordinated Development of a Circular Economy in China and Its Application

Ji-liang Zheng,Chen Zheng,Pan Chen,Ching Yuan Luk

Frontiers of Engineering Management 2014, Volume 1, Issue 4,   Pages 364-371 doi: 10.15302/J-FEM-2014053

Abstract: Based on the perspective of order parameter, this study uses economic and environmental subsystems toestablish an evaluation model that examines the coordinated development of a circular economy within

Keywords： order parameter     coordinated degree evaluation     energy-intensive industry     circular economy    

HTML PDF Collect

Structural parameter design method for a fast-steering mirror based on a closed-loop bandwidth

Guozhen CHEN, Pinkuan LIU, Han DING

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1,   Pages 55-65 doi: 10.1007/s11465-019-0545-y

Abstract: This study proposes a structural parameter design approach for an FSM system based on the quantitative

Keywords： fast-steering mirror     structural parameter     PI controller     bandwidth     notch filter    

HTML PDF Collect

Determination of mechanical parameters for elements in meso-mechanical models of concrete

Xianglin GU, Junyu JIA, Zhuolin WANG, Li HONG, Feng LIN

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 391-401 doi: 10.1007/s11709-013-0225-7

Abstract: tension were calculated based on the discrete element method with the modified-rigid-body-spring concrete model

Keywords： concrete     meso-mechanical model     discrete element method     size effect     mechanical parameter    

HTML PDF Collect

Title Author Date Type Operation

Performance design of a cryogenic air separation unit for variable working conditions using the lumpedparameter model

Jinghua XU, Tiantian WANG, Qianyong CHEN, Shuyou ZHANG, Jianrong TAN

Journal Article

Analysis of the current situation of environmental policy of China and establishment of distributed environmental policy framework

Chaoyang FU,Wangfeng LI

Journal Article

Shallow foundation response variability due to soil and model parameter uncertainty

Prishati RAYCHOWDHURY,Sumit JINDAL

Journal Article

Predictor-corrector algorithm for solving quasi-separated-flow and transient distributed-parameter model

Ping ZHANG, Guoliang DING

Journal Article

Kinematic Model Building and Servo Parameter Identification of 3-HSS Parallel Mechanism

YANG Zhi-yong, WU Jiang, HUANG Tian, NI Yan-bing

Journal Article

Probabilistic model for vessel-bridge collisions in the Three Gorges Reservoir

Bo GENG , Hong WANG , Junjie WANG ,

Journal Article

The formation mechanism and the influence factor of residual stress in machining

Zhaoxu QI,Bin LI,Liangshan XIONG

Journal Article

Ambient vibration testing and updating of the finite element model of a simply supported beam bridge

Ivan Gomez ARAUJO, Esperanza MALDONADO, Gustavo Chio CHO

Journal Article

Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC

Journal Article

Variable stiffness and damping magnetorheological isolator

Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI

Journal Article

Determination of effective stress parameter of unsaturated soils: A Gaussian process regression approach

Pijush Samui, Jagan J

Journal Article

1000 MW ultra-supercritical turbine steam parameter optimization

FENG Weizhong

Journal Article

An Evaluation Model for the Coordinated Development of a Circular Economy in China and Its Application

Ji-liang Zheng,Chen Zheng,Pan Chen,Ching Yuan Luk

Journal Article

Structural parameter design method for a fast-steering mirror based on a closed-loop bandwidth

Guozhen CHEN, Pinkuan LIU, Han DING

Journal Article

Determination of mechanical parameters for elements in meso-mechanical models of concrete

Xianglin GU, Junyu JIA, Zhuolin WANG, Li HONG, Feng LIN

Journal Article