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Meshing stiffness property and meshing status simulation of harmonic drive under transmission loading

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0674-6

Abstract: To calculate the spatial distributed meshing forces and loading backlashes along the axial direction,and finite element model (FEM) is proposed to investigate the meshing state under varied transmission loadingBased on the relationship of meshing forces and circumferential displacements, meshing forces and loadingOwing to the taper deformation of the cup-shaped flexspline, the smallest initial backlash and the earliestthen the teeth in the middle cross-section of the tooth rim enter the meshing and carry most of the loading

Keywords： harmonic drive     meshing flexibility matrix     meshing force     loading backlash     flexspline     contact analysis    

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Modeling and analysis of steady-state vibration induced by backlash in servo rotary table

Xiao YANG,Dun LU,Sanli LIU,Jun ZHANG,Wanhua ZHAO

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1,   Pages 43-47 doi: 10.1007/s11465-015-0327-0

Abstract:

Backlash cannot be always avoided in mechanical systems because of wear or looseness.Steady-state vibration may be induced by backlash in closed loop feed drive systems.This paper presents a mathematical model of a servo rotary table, considering the effect of backlash.the parameters, such as position controller gain, velocity controller gain, load and the magnitude of backlashsteady-state vibration amplitude increases with the position controller gain, load and the magnitude of backlash

Keywords： backlash     servo rotary table     steady-state vibration    

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enhanced damage plasticity model for predicting the cyclic behavior of plain concrete under multiaxial loading

Mohammad Reza AZADI KAKAVAND, Ertugrul TACIROGLU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1531-1544 doi: 10.1007/s11709-020-0675-7

Abstract: current models that adopt two damage variables, the independence of these damage variables during cyclic loadingThe model describes the cyclic behavior of concrete under multiaxial loading conditions and considersusing experimental data on concrete specimens at the material level obtained under cyclic multiaxial loading

Keywords： damage plasticity model     plain concrete     cyclic loading     multiaxial loading conditions    

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Reconsideration on the effect of nitrogen on mixed culture polyhydroxyalkanoate production toward high organic loading

Zhiqiang Chen, Lizhi Zhao, Ye Ji, Qinxue Wen, Long Huang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 4, doi: 10.1007/s11783-019-1135-2

Abstract:

Effect of nitrogen on mixed culture PHA production was reconsidered.

Enrichment history of PHA accumulating culture was discussed.

Higher PHA content and biomass growth were achieved in presence of nitrogen.

Enrichment strategy toward higher PHA accumulation was investigated.

Microbial community succession in PHA accumulation phase was investigated.

Keywords： Polyhydroxyalkanoate (PHA)     Organic loading rate     Nitrogen content     Biomass growth     Enrichment history    

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Effect of loading rate on shear strength parameters of mechanically and biologically treated waste

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 12, doi: 10.1007/s11783-022-1595-7

Abstract:

● Mechanical behavior of MBT waste affected by loading rate was investigated

Keywords： Mechanically and biologically treated waste     Landfill     Triaxial test     Loading rate     Axial strain     Shear    

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Axisymmetric loading on nanoscale multilayered media

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 152-164 doi: 10.1007/s11709-022-0895-0

Abstract: Multilayered nanoscale structures are used in several applications. Because the effect of surface energy becomes nontrivial at such a small scale, a modified continuum theory is required to accurately predict their mechanical behaviors. A Gurtin–Murdoch continuum model of surface elasticity is implemented to establish a computational scheme for investigating an elastic multilayered system under axisymmetric loads with the incorporation of surface/interface energy. Each layer stiffness matrix is derived based on the general solutions of stresses and displacements obtained in the form of the Hankel integral transform. Numerical solutions to the global equation, which are formulated based on the continuity conditions of tractions and displacements across interfaces between layers, yield the displacements at each layer interface and on the top surface of the multilayered medium. The numerical solutions indicate that the elastic responses of multilayered structures are affected significantly by the surface material properties of both the top surface and interfaces, and that they become size dependent. In addition, the indentation problem of a multilayered nanoscale elastic medium under a rigid frictionless cylindrical punch is investigated to demonstrate the application of the proposed solution scheme.

Keywords： functionally graded layer     Gurtin–Murdoch surface elasticity     multilayered medium     size dependency     stiffness matrix    

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Data-driven approach to solve vertical drain under time-dependent loading

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 696-711 doi: 10.1007/s11709-021-0727-7

Abstract: prediction models with three different radial drainage patterns in the smear zone under time-dependent loading

Keywords： vertical drain     artificial neural network     time-dependent loading     deep learning network     genetic algorithm    

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Comparison and harmonization of building wind loading codes among the Asia-Pacific Economies

Yaojun GE, Shuyang CAO, Xinyang JIN

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 402-410 doi: 10.1007/s11709-013-0230-x

Abstract: This paper reviews wind loading codes and standards in the Asia-Pacific Region, in particular in theA general description of wind loading model is given as a famous wind loading chain described by four

Keywords： wind loading     codification     velocity pressure     exposure factor     pressure coefficient     gust response factor    

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Solution to economic dispatch problem with valve-point loading effect by using catfish PSO algorithm

K. MURALI,T. JAYABARATHI

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 290-296 doi: 10.1007/s11708-014-0305-y

Abstract: The ED problems considered in this paper include valve-point loading effect, power balance constraints

Keywords： economic dispatch (ED)     valve point loading     catfish particle swarm optimization (PSO)     optimization    

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Effect of Fe loading quantity on reduction reactivity of nano zero-valent iron supported on chelating

Jialu SHI,Shengnan YI,Chao LONG,Aimin LI

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 5,   Pages 840-849 doi: 10.1007/s11783-015-0781-2

Abstract: To investigate the effect of Fe loading on NZVI reactivity, three NZVI-resin composites with differentFe loading were obtained by preparing Fe(III) solution in 0, 30 and 70% (v/v) ethanol aqueous, respectivelyTEM reveals that increasing the Fe loading resulted in much larger size and poor dispersion of nanoscalethat the removal efficiency of bromate and the rate constant ( ) were decreased with increasing the Fe loadinghowever, under alkaline conditions, the most significant influence of pH was on NZVI-R1 with lowest Fe loading

Keywords： nanoscale zero valent iron     loading quantity     reduction     chelating resin     bromated    

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between laboratory and field moduli of asphalt layer for pavement design and assessment: A comprehensive loading

Huailei CHENG; Liping LIU; Lijun SUN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3,   Pages 267-280 doi: 10.1007/s11709-022-0811-7

Abstract: However, this parameter varies between the laboratory and field loading modes (i.e., loading frequency, compressive or tensile loading pattern), due to the viscoelastic property and composite structure ofThe field modes are vehicular and falling weight deflectometer (FWD) loading modes, and the laboratoryones are uniaxial compressive (UC), indirect tensile (IDT), and four-point bending (4PB) loading modesdifferent loading modes.

Keywords： asphalt mixture layer     stiffness modulus     loading mode     UC/4PB/IDT     FWD     frequency    

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Microbial community dynamics at high organic loading rates revealed by pyrosequencing during sugar refinery

Liguo Zhang, Qiaoying Ban, Jianzheng Li

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 4, doi: 10.1007/s11783-018-1045-8

Abstract:

High strength sugar refinery wastewater was treated in a mesophilic UASB.

Pyrosequencing reveals microbial community succession with OLR increase.

Diversity of microbial communities in OLR12 is much higher than those in OLR36 and OLR54.0 kgCOD/(kg VSS·d).

Fermentative bacteria could deal with increasing OLR through the increase of microbial diversity and quantity.

Hydrogen-producing acotogens and methanogens mainly coped with high OLR shocks by increasing the quantity of community

Keywords： Upflow anaerobic sludge blanket     Sugar refinery wastewater     Organic loading rate     Pyrosequencing     Microbial    

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Hazard potential of zones of weakness in gravity dams under impact loading conditions

Herbert LINSBAUER

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 90-97 doi: 10.1007/s11709-010-0008-3

Abstract: focuses on the stability analysis of a pressure-water filled crack configuration subjected to “dynamic loading” in the form of seismic action on the dam-reservoir-system and alternatively by “impact spot-loading

Keywords： dam-reservoir     earthquake     impact     cracking     fracture mechanics    

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Relationships between loading rates and nitrogen removal effectiveness in subsurface flow constructed

ZHANG Rongshe, LI Guanghe, ZHANG Xu, ZHOU Qi

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 1,   Pages 89-93 doi: 10.1007/s11783-008-0002-3

Abstract: The outflow loading and total nitrogen (TN) removal rate of these beds under different inflow loadingsThe results showed that the inflow and outflow loading of TN removal rate in SFS presented an obviousThe optical inflow loading to run the system was between 2000 to 4000 mg·(m·d).
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Shear-critical reinforced concrete columns under various loading rates

Witarto WITARTO,Liang LU,Rachel Howser ROBERTS,Y. L. MO,Xilin LU

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 4,   Pages 362-372 doi: 10.1007/s11709-014-0083-y

Abstract: presents an experimental study of shear-governed reinforced concrete columns subjected to different loadingFour typical short columns were tested cyclically with loading rate of 0.05, 1, 3, and 5 Hz, simulatingTest result indicated that the loading rate does not affect the column behavior when the rate is up toThe analytical model successfully modeled the cyclic loading test results.

Keywords： reinforced concrete columns     shear failure     loading rate     Carbon Nano-Fiber Aggregates (CNFAs)     finite element    

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Title Author Date Type Operation

Meshing stiffness property and meshing status simulation of harmonic drive under transmission loading

Journal Article

Modeling and analysis of steady-state vibration induced by backlash in servo rotary table

Xiao YANG,Dun LU,Sanli LIU,Jun ZHANG,Wanhua ZHAO

Journal Article

enhanced damage plasticity model for predicting the cyclic behavior of plain concrete under multiaxial loading

Mohammad Reza AZADI KAKAVAND, Ertugrul TACIROGLU

Journal Article

Reconsideration on the effect of nitrogen on mixed culture polyhydroxyalkanoate production toward high organic loading

Zhiqiang Chen, Lizhi Zhao, Ye Ji, Qinxue Wen, Long Huang

Journal Article

Effect of loading rate on shear strength parameters of mechanically and biologically treated waste

Journal Article

Axisymmetric loading on nanoscale multilayered media

Journal Article

Data-driven approach to solve vertical drain under time-dependent loading

Journal Article

Comparison and harmonization of building wind loading codes among the Asia-Pacific Economies

Yaojun GE, Shuyang CAO, Xinyang JIN

Journal Article

Solution to economic dispatch problem with valve-point loading effect by using catfish PSO algorithm

K. MURALI,T. JAYABARATHI

Journal Article

Effect of Fe loading quantity on reduction reactivity of nano zero-valent iron supported on chelating

Jialu SHI,Shengnan YI,Chao LONG,Aimin LI

Journal Article

between laboratory and field moduli of asphalt layer for pavement design and assessment: A comprehensive loading

Huailei CHENG; Liping LIU; Lijun SUN

Journal Article

Microbial community dynamics at high organic loading rates revealed by pyrosequencing during sugar refinery

Liguo Zhang, Qiaoying Ban, Jianzheng Li

Journal Article

Hazard potential of zones of weakness in gravity dams under impact loading conditions

Herbert LINSBAUER

Journal Article

Relationships between loading rates and nitrogen removal effectiveness in subsurface flow constructed

ZHANG Rongshe, LI Guanghe, ZHANG Xu, ZHOU Qi

Journal Article

Shear-critical reinforced concrete columns under various loading rates

Witarto WITARTO,Liang LU,Rachel Howser ROBERTS,Y. L. MO,Xilin LU

Journal Article