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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: computational cost of inferring the input fault parameters for the observed output or solving the inverse problemThe 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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Analysis of Plates and Shells and Its Application

Liu Renhuai

Strategic Study of CAE 2000, Volume 2, Issue 11, Pages 60-67

Abstract: However, there are still many problems left to be solved in the fields on nonlinear theory of thin platesauthor did in nearly forty years, which has been well applied to engineering problems, in the areas of nonlinear

Keywords： thin plates and shells thick plates and shells nonlinear problem linear problem bending stability vibration

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Discussion on Problem-Based Engineering Management System

Qiao Xiang

Frontiers of Engineering Management 2015, Volume 2, Issue 3, Pages 249-260 doi: 10.15302/J-FEM-2015054

Abstract: The paper puts forward the idea of problem-based engineering management, expounds its connotation and

Keywords： problem engineering management system

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Airline planning and scheduling: Models and solution methodologies

Lei ZHOU, Zhe LIANG, Chun-An CHOU, Wanpracha Art CHAOVALITWONGSE

Frontiers of Engineering Management 2020, Volume 7, Issue 1, Pages 1-26 doi: 10.1007/s42524-020-0093-5

Abstract: General formulation, widely used solution approaches, and important extensions are presented for each problem

Keywords： airline planning fleet assignment problem aircraft routing problem crew pairing problem crew rosteringproblem crew scheduling problem integrated planning

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New nonlinear stiffness actuator with predefined torque‒deflection profile

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0721-3

Abstract: A nonlinear stiffness actuator (NSA) could achieve high torque/force resolution in low stiffness range

Keywords： compliant actuator nonlinear stiffness actuator nonlinear spring predefined torque−deflection profile

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A solution to stochastic unit commitment problem for a wind-thermal system coordination

B. SARAVANAN,Shreya MISHRA,Debrupa NAG

Frontiers in Energy 2014, Volume 8, Issue 2, Pages 192-200 doi: 10.1007/s11708-014-0306-x

Abstract: Unit commitment (UC) problem is one of the most important decision making problems in power system.In this paper the UC problem is solved by considering it as a real time problem by adding stochasticityaddressed is the achievement of an economic unit commitment solution after solving UC as a real time problemThis paper proposes a hybrid approach to solve the stochastic unit commitment problem considering thevolatile nature of wind and formulating the UC problem as a chance constrained problem in which the

Keywords： unit commitment (UC) randomness wind generation univariate chance constrained

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Solving unit commitment problem using a novel version of harmony search algorithm

Roozbeh MORSALI,Tohid JAFARI,Amirhossein GHODS,Mohammad KARIMI

Frontiers in Energy 2014, Volume 8, Issue 3, Pages 297-304 doi: 10.1007/s11708-014-0309-7

Abstract: novel structure was proposed for improving harmony search (HS) algorithm to solve the unit comment (UC) problem

Keywords： generation scheduling harmony search (HS) algorithm intelligent technique unit commitment

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Transient analysis of thermoelastic contact problem of disk brakes

Ali BELHOCINE, Mostefa BOUCHETARA

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2, Pages 150-159 doi: 10.1007/s11465-013-0266-6

Abstract:

The main purpose of this study is to analyze the thermomechanical behavior of the dry contact between the brake disk and pads during the braking phase. The simulation strategy is based on computer code ANSYS11. The modeling of transient temperature in the disk is actually used to identify the factor of geometric design of the disk to install the ventilation system in vehicles. The thermal-structural analysis is then used with coupling to determine the deformation established and the Von Mises stresses in the disk, the contact pressure distribution in pads. The results are satisfactory compared to those found in the literature.

Keywords： brake disks heat flux heat-transfer coefficient Von Mises stress contact pressure

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A solution to the unit commitment problem—a review

B. SARAVANAN, Siddharth DAS, Surbhi SIKRI, D. P. KOTHARI

Frontiers in Energy 2013, Volume 7, Issue 2, Pages 223-236 doi: 10.1007/s11708-013-0240-3

Abstract: Unit commitment (UC) is an optimization problem used to determine the operation schedule of the generatingMany algorithms have been invented in the past five decades for optimization of the UC problem, but stillresearchers are working in this field to find new hybrid algorithms to make the problem more realistic

Keywords： unit commitment (UC) optimization deterministic load stochastic load evolutionary programming (EP) hybrid

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Mean wind load induced incompatibility in nonlinear aeroelastic simulations of bridge spans

Zhitian ZHANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3, Pages 605-617 doi: 10.1007/s11709-018-0499-x

Abstract: Mean wind response induced incompatibility and nonlinearity in bridge aerodynamics is discussed, where the mean wind and aeroelastic loads are applied simultaneously in time domain. A kind of incompatibility is found during the simultaneous simulation of the mean wind and aeroelastic loads, which leads to incorrect mean wind structural responses. It is found that the mathematic expectations (or limiting characteristics) of the aeroelastic models are fundamental to this kind of incompatibility. In this paper, two aeroelastic models are presented and discussed, one of indicial-function-denoted (IF-denoted) and another of rational-function-denoted (RF-denoted). It is shown that, in cases of low wind speeds, the IF-denoted model reflects correctly the mean wind load properties, and results in correct mean structural responses; in contrast, the RF-denoted model leads to incorrect mean responses due to its nonphysical mean properties. At very high wind speeds, however, even the IF-denoted model can lead to significant deviation from the correct response due to steady aerodynamic nonlinearity. To solve the incompatibility at high wind speeds, a methodology of subtraction of pseudo-steady effects from the aeroelastic model is put forward in this work. Finally, with the method presented, aeroelastic nonlinearity resulted from the mean wind response is investigated at both moderate and high wind speeds.

Keywords： bridge aerodynamics nonlinear aeroelastic model Pseudo-steady mean wind loads

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General expression for linear and nonlinear time series models

Ren HUANG, Feiyun XU, Ruwen CHEN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 15-24 doi: 10.1007/s11465-009-0015-z

Abstract: However, some nonlinear factors are within the practical system; thus, it is difficult to fit the modelThis paper proposes a general expression for linear and nonlinear auto-regressive time series modelsexperiments show that the GNAR model can accurately approximate to the dynamic characteristics of the most nonlinear

Keywords： linear and nonlinear autoregressive model system identification time series analysis

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Evaluation of transmissibility for a class of nonlinear passive vibration isolators

Z. K. PENG, Z. Q. LANG, G. MENG

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4, Pages 401-409 doi: 10.1007/s11465-012-0349-9

Abstract: concept of Output Frequency Response Functions (OFRFs) is applied to represent the transmissibility of nonlinearcharacteristic parameters is derived for a wide class of nonlinear isolators that have nonlinear anti-symmetricdamping characteristics and a comprehensive pattern about how the nonlinear damping characteristic parametersThese conclusions are of significant importance in the analysis and design of the nonlinear vibrationisolators with nonlinear anti-symmetric damping.

Keywords： nonlinear vibration volterra series Output Frequency Response Functions (OFRFs) nonlinear damping vibration

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Hydrocele of the canal of Nuck — an old problem revisited

John Bunni, Mark Gillam, Ian Michael Pope

Frontiers of Medicine 2013, Volume 7, Issue 4, Pages 517-519 doi: 10.1007/s11684-013-0300-4

Abstract:

Herein the authors describe the case of a young woman presenting with a tender lump in her groin. Clinically the differential was of either a reactive lymph node or a femoral hernia. Ultrasound scan was urgently arranged and showed a cystic lesion. Surgical exploration was carried out and revealed this to be a hydrocele of the canal of Nuck. This was excised and the patient’s symptoms resolved and she was discharged home the following day. We explore the embryology, pathophysiology and management of this rare entity.

Keywords： canal of Nuck hernia embryology

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Numerical analysis of nonlinear dynamic behavior of earth dams

Babak EBRAHIMIAN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1, Pages 24-40 doi: 10.1007/s11709-010-0082-6

Abstract: The numerical investigation employs a fully nonlinear dynamic finite difference analysis incorporating

Keywords： earth dam numerical nonlinear response dynamic analysis earthquake dam height

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Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators

Hamid M. SEDIGHI, Hassen M. OUAKAD

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6, Pages 1520-1530 doi: 10.1007/s11709-020-0672-x

Abstract: this study, for the first time, we investigate the nonlocality superimposed to the size effects on the nonlineara reduced-order model based on the differential quadrature method (DQM) to discretize the governing nonlinearequation of motion and acquire a discretized-parameter nonlinear model of the system.The structural nonlinear behavior of the system assuming both strain and velocity gradient theories is

Keywords： velocity gradient elasticity theory nanotube resonators differential-quadrature method nonlinear vibration