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Experimental and theoretical investigations of the lateral vibrations of an unbalanced Jeffcott rotor

Ali ALSALEH, Hamid M. SEDIGHI, Hassen M. OUAKAD

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 1024-1032 doi: 10.1007/s11709-020-0647-y

Abstract: The dynamic features of the rotor system such as the linearized bearing induced stiffness are exclusively

Keywords： rotor-dynamics     Jeffcott rotor     lateral vibrations     Lagrange method     system-equivalent stiffness     sleeve bearings     oil film induced stiffness    

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Manufacturing and mechanical properties of composite orthotropic Kagome honeycomb using novel modular method

Bin NIU, Shijie LI, Rui YANG

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 3,   Pages 484-495 doi: 10.1007/s11465-020-0593-3

Abstract: element method is used to perform homogenization analysis of the Kagome honeycomb panels and to obtain equivalentin-plane and bending stiffness.Finite element analysis using these equivalent properties is conducted and validated against the experimental

Keywords： composite     Kagome honeycomb     manufacturing     placement of fibers     equivalent stiffness    

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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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A modified zone model for estimating equivalent room thermal capacity

Hua CHEN, Xiaolin WANG

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 351-357 doi: 10.1007/s11708-013-0254-x

Abstract: The zone model has been widely applied in control analysis of heating, ventilation and air conditioning (HVAC) systems to achieve a high building efficiency. This paper proposed a modified zone model which is much simpler in the HVAC system simulation and has the similar accuracy to the complicated simulation model. The proposed model took into consideration the effect of envelop heat reservoir on the room indoor temperature by introducing the thermal admittance of the inner surfaces of the building enclosure. The thermal admittance for the building enclosure was developed based on the building thermal network analytical theory and transfer function method. The efficacy of the proposed model was demonstrated by comparing it with the complicated model — heat balance method (HTB2 program). The predicted results from the proposed model well agreed with those from the complicated simulation. The proposed model can then make the HVAC system dynamic simulation much faster and more acceptable for control design due to its simplicity and efficiency.

Keywords： room model     thermal network analysis     transfer function     heating     ventilation and air conditioning (HVAC) system simulation    

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Distribution of background equivalent static wind load on high-rise buildings

Jianguo ZHANG , Ming GU ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 241-248 doi: 10.1007/s11709-009-0036-z

Abstract: gust load envelope (GLE) methods, are verified in terms of their accuracy in describing the background equivalentBased on the results, formulae of the distribution of background equivalent static load on high-rise

Keywords： high-rise buildings     along-wind     cross-wind     background equivalent static wind load     close formulae    

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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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China’s new problems of food security revealed by the Food Equivalent Unit

Huilong LIN,Ruichao LI,Cangyu JIN,Chong WANG,Maohong WEI,Jizhou REN

Frontiers of Agricultural Science and Engineering 2014, Volume 1, Issue 1,   Pages 69-76 doi: 10.15302/J-FASE-2014023

Abstract: Thus, not only grain for human consumption, but also animal foods have been integrated into the Food Equivalent

Keywords： food security     nutrition security     food equivalent unit     grassland agriculture     China    

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Equivalent circuit and characteristic simulation of a brushless electrically excited synchronous wind

Hao WANG, Fengge ZHANG, Tao GUAN, Siyang YU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 420-426 doi: 10.1007/s11465-017-0439-9

Abstract: In view of this problem, the equivalent circuit and electromagnetic torque expression of the BEESG areThe generator is simulated and tested experimentally using the established equivalent circuit model.Results show the validity of the equivalent circuit model.

Keywords： wind power     brushless electrically excited synchronous generator     hybrid rotor     equivalent circuit    

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Dynamical Experiment Research on New Seismic Isolation Bearings with SMA Wires

Deng Zongcai,Sun Hongjun,Liu Chunguo,Niu Kun,Deng Hongliang

Strategic Study of CAE 2005, Volume 7, Issue 12,   Pages 61-68

Abstract: The factors which affect the level stiffness, energy dissipation and equivalent damping ratio of SMA-rubber

Keywords： shape memory alloy     seismic isolation bearings     initial stiffness     hysteresis energy dissipation     equivalent    

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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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Title Author Date Type Operation

Experimental and theoretical investigations of the lateral vibrations of an unbalanced Jeffcott rotor

Ali ALSALEH, Hamid M. SEDIGHI, Hassen M. OUAKAD

Journal Article

Manufacturing and mechanical properties of composite orthotropic Kagome honeycomb using novel modular method

Bin NIU, Shijie LI, Rui YANG

Journal Article

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

Journal Article

A modified zone model for estimating equivalent room thermal capacity

Hua CHEN, Xiaolin WANG

Journal Article

Distribution of background equivalent static wind load on high-rise buildings

Jianguo ZHANG , Ming GU ,

Journal Article

Comparison of indices for stiffness performance evaluation

Giuseppe CARBONE, Marco CECCARELLI,

Journal Article

China’s new problems of food security revealed by the Food Equivalent Unit

Huilong LIN,Ruichao LI,Cangyu JIN,Chong WANG,Maohong WEI,Jizhou REN

Journal Article

Equivalent circuit and characteristic simulation of a brushless electrically excited synchronous wind

Hao WANG, Fengge ZHANG, Tao GUAN, Siyang YU

Journal Article

Dynamical Experiment Research on New Seismic Isolation Bearings with SMA Wires

Deng Zongcai,Sun Hongjun,Liu Chunguo,Niu Kun,Deng Hongliang

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