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Method for solving the nonlinear inverse problem in gas face seal diagnosis based on surrogate models

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0689-z

Abstract: unacceptable computational cost of inferring the input fault parameters for the observed output or solving the inverseproblem of the physical model.The presented work develops a surrogate-model-assisted method for solving the nonlinear inverse problem

Keywords： surrogate model     gas face seal     fault diagnosis     nonlinear dynamics     tribology    

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Ahybrid biogeography-based optimization method for the inverse kinematics problem of an 8-DOF redundant

Zi-wu REN,Zhen-hua WANG,Li-ning SUN

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 7,   Pages 607-616 doi: 10.1631/FITEE.14a0335

Abstract: characteristics of multiple degrees of freedom and complex joint structure, and it is not easy to obtain its inverseThe inverse kinematics problem of a humanoid manipulator can be formulated as an equivalent minimizationproblem, and thus it can be solved using some numerical optimization methods.kinematics problem of a humanoid manipulator.The proposed HBBO algorithm has been used to solve the inverse kinematics problem of the 8-DOF redundant

Keywords： Inverse kinematics problem     8-DOF humanoid manipulator     Biogeography-based optimization (BBO)     Differential    

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Shape reconstruction of parallelogram flaw

ZHENG Gangfeng, WU Bin, HE Cunfu

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1,   Pages 17-22 doi: 10.1007/s11465-008-0015-4

Abstract: elastic media, the authors deduce the Born approximation solution of the two-dimensional scattering problembe considered as a Fourier transform of the characteristic function, which is reconstructed from the inverseThe identification of the geometrical character of a flaw is then given by the two dimensional inverse

Keywords： approximation     scatterer     scattering problem     information     inverse    

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Approximation of structural damping and input excitation force

Mohammad SALAVATI

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 244-254 doi: 10.1007/s11709-016-0371-9

Abstract: On the other hand, solving the inverse problem of the input force estimation and its distribution to

Keywords： structural modal parameters     damping identification method     input excitation force identification     Inverseproblem    

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Identification of structural parameters and boundary conditions using a minimum number of measurement points

Ali KARIMPOUR, Salam RAHMATALLA

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1331-1348 doi: 10.1007/s11709-020-0686-4

Abstract: An inverse iterative process is then applied to identify the structural parameters by matching the experimental

Keywords： structural model validation     eigenvalue problem     response surface     inverse problems    

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A New Method for Inferencing and Representing a Workpiece Residual Stress Field Using Monitored Deformation Force Data

Zhiwei Zhao,Changqing Liu,Yingguang Li,James Gao,

Engineering doi: 10.1016/j.eng.2022.07.018

Abstract: stress field is modeled based on the principle of virtual work, and the residual stress field inference problem

Keywords： Residual stress field     Precision manufacturing     Deformation force     Inverse problem     In situ     measurement    

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Performance of inverse fluidized bed bioreactor in treating starch wastewater

M. RAJASIMMAN, C. KARTHIKEYAN

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 3,   Pages 235-239 doi: 10.1007/s11705-009-0020-0

Abstract: Aerobic digestion of starch industry wastewater was carried out in an inverse fluidized bed bioreactor

Keywords： inverse fluidization     low-density particles     polypropylene     starch     biofilm    

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Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements

S. SAMANTA, S. S. NANTHAKUMAR, R. K. ANNABATTULA, X. ZHUANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 542-556 doi: 10.1007/s11709-018-0496-0

Abstract: The aim of current work is to improve the existing inverse methodology of void-detection based on a targetfollowed by an iterative optimization algorithm based on univariate method has been used to solve the problem

Keywords： piezoelectricity     impedance curve     mode shapes     inverse problem     flaw detection     curve shifting    

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Efficient conversion of lignin to alkylphenols over highly stable inverse spinel MnFeO catalysts

Frontiers of Chemical Science and Engineering doi: 10.1007/s11705-022-2236-1

Abstract: The aromatic properties of lignin make it a promising source of valuable chemicals and fuels. Developing efficient and stable catalysts to effectively convert lignin into high-value chemicals is challenging. In this work, MnFe2O4 spinel catalysts with oxygen-rich vacancies and porous distribution were synthesized by a simple solvothermal process and used to catalyze the depolymerization of lignin in an isopropanol solvent system. The specific surface area was 110.5 m2∙g–1, which substantially increased the active sites for lignin depolymerization compared to Fe3O4. The conversion of lignin reached 94%, and the selectivity of alkylphenols exceeded 90% after 5 h at 250 °C. Underpinned by characterizations, products, and density functional theory analysis, the results showed that the catalytic performance of MnFe2O4 was attributed to the composition of Mn and Fe with strong Mn–O–Fe synergy. In addition, the cycling experiments and characterization showed that the depolymerized lignin on MnFe2O4 has excellent cycling stability. Thus, our work provides valuable insights into the mechanism of lignin catalytic depolymerization and paves the way for the industrial-scale application of this process.

Keywords： lignin depolymerization     spinel     catalysts     hydrogenation    

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Inverse identification of the mechanical parameters of a pipeline hoop and analysis of the effect of

Ye GAO, Wei SUN

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 358-368 doi: 10.1007/s11465-019-0539-9

Abstract: In this study, an inverse method was developed by utilizing measured vibration data to identify the supportOn the premise of selecting initial values reasonably, an inverse identification algorithm based on sensitivity

Keywords： inverse identification     pipeline hoop     frequency response function     mechanical parameters     preload    

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Precise semi-analytical inverse kinematic solution for 7-DOF offset manipulator with arm angle optimization

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 3,   Pages 435-450 doi: 10.1007/s11465-021-0630-x

Abstract: This study proposes a high-precision, semi-analytical inverse method for EMMs.Firstly, the analytical inverse kinematic solution is established based on joint angle parameterizationSecondly, the analytical inverse kinematic solution for a non-offset spherical–roll–spherical (SRS) redundantThirdly, the error is corrected using a numerical method through the analytical inverse solution basedAfter selecting the stride and termination condition, the precise inverse solution is computed for the

Keywords： 7-DOF redundant manipulator     inverse kinematics     semi-analytical     arm angle     link offset    

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Analysis of nonlinear channel friction inverse problem

CHENG Weiping, LIU Guohua

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2,   Pages 205-210 doi: 10.1007/s11709-007-0024-0

Abstract: Based on the Backus-Gilbert inverse theory, the singular value decomposition (SVD) for general inversematrices and the optimization algorithm are used to solve the channel friction inverse problem.The resolution and covariance friction inverse model in matrix form is developed to examine the reliability

Keywords： singular     SVD     second-order     covariance     Theoretical    

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General closed-form inverse kinematics for arbitrary three-joint subproblems based on the product of

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0681-7

Abstract: The inverse kinematics problems of robots are usually decomposed into several Paden–Kahan subproblemsHowever, the simple combination of subproblems cannot solve all the inverse kinematics problems, andThe novel algebraic geometric (NAG) methods that obtain the general closed-form inverse kinematics forclosed-form inverse kinematics.The results verify the proposed general closed-form inverse kinematics based on the NAG methods.

Keywords： inverse kinematics     Paden–Kahan subproblems     three-joint subproblems     product of exponential     closed-form    

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A highly efficient reconfigurable rotation unit based on an inverse butterfly network Article

Chao MA, Zi-bin DAI, Wei LI, Hai-juan ZANG

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 11,   Pages 1784-1794 doi: 10.1631/FITEE.1601265

Abstract: The algorithm uses a self-routing characteristic to configure an inverse butterfly network.

Keywords： Rotation operations     Self-routing     Control-bit generation algorithm     Inverse butterfly network    

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Mechanism and Modeling for Polymerization of Acrylamide in Inverse Microemulsions

Li Xiao,Zhang Weiying,Yuan Huigen

Strategic Study of Chinese Academy of Engineering 2003, Volume 5, Issue 1,   Pages 69-73

Abstract:

After discussion on the mechanism of polymer particle nucleation and growth in inverse microemulsionpolymerization, a schematic physical model for polymerization of acrylamide in inverse microemulsionsFurthermore, several key problems in mathematically modeling of inverse microemulsion polymerization

Keywords： inverse microemulsion polymerization     mechanism     modeling     acrylamide    

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Title Author Date Type Operation

Method for solving the nonlinear inverse problem in gas face seal diagnosis based on surrogate models

Journal Article

Ahybrid biogeography-based optimization method for the inverse kinematics problem of an 8-DOF redundant

Zi-wu REN,Zhen-hua WANG,Li-ning SUN

Journal Article

Shape reconstruction of parallelogram flaw

ZHENG Gangfeng, WU Bin, HE Cunfu

Journal Article

Approximation of structural damping and input excitation force

Mohammad SALAVATI

Journal Article

Identification of structural parameters and boundary conditions using a minimum number of measurement points

Ali KARIMPOUR, Salam RAHMATALLA

Journal Article

A New Method for Inferencing and Representing a Workpiece Residual Stress Field Using Monitored Deformation Force Data

Zhiwei Zhao,Changqing Liu,Yingguang Li,James Gao,

Journal Article

Performance of inverse fluidized bed bioreactor in treating starch wastewater

M. RAJASIMMAN, C. KARTHIKEYAN

Journal Article

Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements

S. SAMANTA, S. S. NANTHAKUMAR, R. K. ANNABATTULA, X. ZHUANG

Journal Article

Efficient conversion of lignin to alkylphenols over highly stable inverse spinel MnFeO catalysts

Journal Article

Inverse identification of the mechanical parameters of a pipeline hoop and analysis of the effect of

Ye GAO, Wei SUN

Journal Article

Precise semi-analytical inverse kinematic solution for 7-DOF offset manipulator with arm angle optimization

Journal Article

Analysis of nonlinear channel friction inverse problem

CHENG Weiping, LIU Guohua

Journal Article

General closed-form inverse kinematics for arbitrary three-joint subproblems based on the product of

Journal Article

A highly efficient reconfigurable rotation unit based on an inverse butterfly network

Chao MA, Zi-bin DAI, Wei LI, Hai-juan ZANG

Journal Article

Mechanism and Modeling for Polymerization of Acrylamide in Inverse Microemulsions

Li Xiao,Zhang Weiying,Yuan Huigen

Journal Article