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Optimization of the mechanical performance and damage failure characteristics of laminated composites based on fiber orientation

Frontiers of Structural and Civil Engineering   Pages 1357-1369 doi: 10.1007/s11709-023-0996-4

Abstract: The influence of fiber orientation angle on the mechanical properties and stiffness degradation of thetesting revealed that, although the composite laminates laid along the 0° direction exhibited the highest stiffness

Keywords： fiber orientation     composite laminates     stiffness degradation     analytical approaches     finite element    

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Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 390-398 doi: 10.1007/s11709-021-0690-3

Abstract: pattern, performance levels, displacement ductility ( ), energy dissipation, and connection strength and stiffnesseccentricity has no significant effect on the lateral load carrying capacity; however, the overall strength degradationSimilarly, the elastic stiffness of specimen 2 decreased by 14% as the eccentricity increased from 12.5%to 25%; however, the eccentricity had no significant effect on the overall stiffness degradation.

Keywords： corner connection     eccentricity     strength degradation     stiffness degradation     energy dissipation     performance    

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Mechanical design and analysis of a novel variable stiffness actuator with symmetrical pivot adjustment

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4,   Pages 711-725 doi: 10.1007/s11465-021-0647-1

Abstract: Thus, this paper aims to design a novel variable stiffness actuator (VSA) that can provide safer physicalVSA follows the idea of modular design, mainly including a variable stiffness module and a drive moduleThe variable stiffness module transmits the motion from the drive module in a roundabout manner, makingAs the key component of the variable stiffness module, a stiffness adjustment mechanism with a symmetricalExperiment results show that the VSA stiffness is close to the theoretical design stiffness.

Keywords： variable stiffness actuator     variable stiffness module     drive module     symmetrical structure     double-deck    

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Comparison of indices for stiffness performance evaluation

Giuseppe CARBONE, Marco CECCARELLI,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 3,   Pages 270-278 doi: 10.1007/s11465-010-0023-z

Abstract: This paper addresses the problem of a numerical evaluation of the stiffness performance for multibodyStiffness indices are computed and compared for a case study.Results are used for comparing the effectiveness of the stiffness indices.

Keywords： robotics     stiffness     performance indices    

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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 rangeand high bandwidth in high stiffness range, both of which are beneficial for physical interaction between

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

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Mechanical design, modeling, and identification for a novel antagonistic variable stiffness dexterous

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0691-5

Abstract: It achieves finger stiffness adjustability according to the biologically inspired stiffness variationprinciple of discarding some mobilities to adjust stiffness.The mechanical design of the finger and its stiffness adjusting methods are elaborated.The stiffness characteristics of the finger joint and the actuation unit are analyzed.finger stiffness presets are provided to verify the validity of the model.

Keywords： multifingered hand     mechanism design     robot safety     variable stiffness actuator    

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Mechanical performance analysis and stiffness test of a new type of suspension bridge

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1160-1180 doi: 10.1007/s11709-021-0760-6

Abstract: A new type of suspension bridge is proposed based on the gravity stiffness principle.The rigid webs connect the main cable and main girder to form a truss that can improve the bending stiffnessbraces connect the main cables to form a closed space truss structure that can improve the torsional stiffnessA stiffness test was carried out on the new type of suspension bridge with a small span, and the results

Keywords： new type of suspension bridge     stiffness test     mechanical performance     railway bridge     space truss    

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Investigating the influence of delamination on the stiffness of composite pipes under compressive transverse

Sattar MALEKI, Roham RAFIEE, Abolfazl HASANNIA, Mohammad Reza HABIBAGAHI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 6,   Pages 1316-1323 doi: 10.1007/s11709-019-0555-1

Abstract: The effect of delamination on the stiffness reduction of composite pipes is studied in this research.The stiffness test of filament wound composite pipes is simulated using cohesive zone method.geometrical parameters including delamination size and its position with respect to loading direction on stiffnessAt first, finite element results for stiffness test of a perfect pipe without delamination are validateddirections and also its orientation with respect to loading direction on delamination propagation and stiffness

Keywords： delamination     composite pipes     stiffness test     cohesive zone method    

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A numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 10-24 doi: 10.1007/s11709-022-0904-3

Abstract: The free-field responses are first obtained using the stiffness matrix method based on plane-wave assumptions

Keywords： underground structures     seismic response     stiffness matrix method     domain reduction method     P-SV waves    

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Gear fault diagnosis using gear meshing stiffness identified by gearbox housing vibration signals

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0713-3

Abstract: The gear meshing stiffness (GMS) identification approach is proposed by using housing vibration signalsdiscovered in the identified GMS spectra, and the results also validate the rationality of using meshing stiffness

Keywords： gearbox fault diagnosis     meshing stiffness     identification     transfer path     signal processing    

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Stiffness of a 3-degree of freedom translational parallel kinematic machine

S. SHANKAR GANESH,A.B. KOTESWARA RAO

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 3,   Pages 233-241 doi: 10.1007/s11465-014-0312-z

Abstract: Stiffness modeling is done based on the compliance matrices of arm and forearm of each limb.Using the stiffness modeling the variations of minimum and maximum translational stiffness in the workspacevarious architectural parameters of the 3-DOF PKM the tendency of variations on the minimum and maximum stiffness

Keywords： 3-DOF translational PKM     inverse kinematics     stiffness modeling     translational stiffness    

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Design and experimental study of a passive power-source-free stiffness-self-adjustable mechanism

Yuwang LIU, Dongqi WANG, Shangkui YANG, Jinguo LIU, Guangbo HAO

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1,   Pages 32-45 doi: 10.1007/s11465-020-0604-4

Abstract: Passive variable stiffness joints have unique advantages over active variable stiffness joints and areWe propose a new passive power-source-free stiffness-self-adjustable mechanism that can be used as theself-adaptive adjustment of stiffness in a purely mechanical manner.The variable stiffness mechanism can automatically adjust joint stiffness in accordance with the magnitudeThe variable stiffness principle is explained, and the design of the variable stiffness mechanism is

Keywords： variable stiffness mechanism     stiffness self-regulation     bionic robot     modeling    

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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: paper presents the development and characterization of a magnetorheological (MR) fluid-based variable stiffnessExperimental results indicate that both the stiffness and damping capability of the developed MR isolator

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

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Stiffness analysis and experimental validation of robotic systems

Giuseppe CARBONE

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2,   Pages 182-196 doi: 10.1007/s11465-011-0221-3

Abstract:

Stiffness can be considered of primary importance in order to guarantee the successful use of anyThe proposed numerical procedure is based on models with lumped parameters for deriving the Cartesian stiffnessStiffness performance indices are also proposed for comparing stiffness performance.Then, an experimental procedure for the evaluation stiffness performance is proposed as based on a newanalysis and experimental validation of stiffness performance.

Keywords： robotics     stiffness performance     numerical and experimental estimations    

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Identification of dynamic stiffness matrix of bearing joint region

Feng HU, Bo WU, Youmin HU, Tielin SHI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 289-299 doi: 10.1007/s11465-009-0064-3

Abstract: The paper proposes an identification method of the dynamic stiffness matrix of a bearing joint regionThe author deduces an identification model of the dynamic stiffness matrix from the synthetic substructureThe dynamic stiffness matrix of the bearing joint region can be identified by measuring the matrix ofmodel, agrees with experimental results, and there is very high reliability in the identified dynamic stiffness

Keywords： frequency response function (FRFs)     dynamic stiffness     finite element     synthetic substructure method     joint    

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Title Author Date Type Operation

Optimization of the mechanical performance and damage failure characteristics of laminated composites based on fiber orientation

Journal Article

Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

Journal Article

Mechanical design and analysis of a novel variable stiffness actuator with symmetrical pivot adjustment

Journal Article

Comparison of indices for stiffness performance evaluation

Giuseppe CARBONE, Marco CECCARELLI,

Journal Article

New nonlinear stiffness actuator with predefined torque‒deflection profile

Journal Article

Mechanical design, modeling, and identification for a novel antagonistic variable stiffness dexterous

Journal Article

Mechanical performance analysis and stiffness test of a new type of suspension bridge

Journal Article

Investigating the influence of delamination on the stiffness of composite pipes under compressive transverse

Sattar MALEKI, Roham RAFIEE, Abolfazl HASANNIA, Mohammad Reza HABIBAGAHI

Journal Article

A numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness

Journal Article

Gear fault diagnosis using gear meshing stiffness identified by gearbox housing vibration signals

Journal Article

Stiffness of a 3-degree of freedom translational parallel kinematic machine

S. SHANKAR GANESH,A.B. KOTESWARA RAO

Journal Article

Design and experimental study of a passive power-source-free stiffness-self-adjustable mechanism

Yuwang LIU, Dongqi WANG, Shangkui YANG, Jinguo LIU, Guangbo HAO

Journal Article

Variable stiffness and damping magnetorheological isolator

Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI

Journal Article

Stiffness analysis and experimental validation of robotic systems

Giuseppe CARBONE

Journal Article

Identification of dynamic stiffness matrix of bearing joint region

Feng HU, Bo WU, Youmin HU, Tielin SHI

Journal Article