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A Precision-Positioning Method for a High-Acceleration Low-Load Mechanism Based on Optimal Spatial and Article

Xin Chen,Youdun Bai,Zhijun Yang,Jian Gao,Gongfa Chen

Engineering 2015, Volume 1, Issue 3,   Pages 391-398 doi: 10.15302/J-ENG-2015063

Abstract: structural optimization, we first reviewed the commonly flexible multibody dynamic optimization using equivalentstatic loads method (ESLM), and then we selected the modified ESLM for optimal spatial distributionFor velocity planning, we developed a new velocity-planning method based on nonlinear dynamic-responseOur method was verified on a high-acceleration die bonder.This method provides an effective theoretical support for the precision positioning of high-acceleration

Keywords： high-acceleration low-load mechanism     precision positioning     spatial and temporal distribution     inertial energy     equivalentstatic loads method (ESLM)     velocity planning    

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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 equivalentstatic wind load distribution on high-rise buildings.Based 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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A FEniCS implementation of the phase field method for quasi-static brittle fracture

HIRSHIKESH, Sundararajan NATARAJAN, Ratna Kumar ANNABATTULA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 380-396 doi: 10.1007/s11709-018-0471-9

Abstract: In the recent years, the phase field method for simulating fracture problems has received considerableThis is due to the salient features of the method: 1) it can be incorporated into any conventional finiteThe present work discusses the implementation of the phase field method for brittle fracture within the

Keywords： phase field method     FEniCS     brittle fracture     crack propagation     variational theory of fracture    

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Numerical analysis of bearing behaviors of single batter piles under horizontal loads in various directions

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 2,   Pages 224-237 doi: 10.1007/s11709-022-0914-1

Abstract: practical engineering; however, the horizontal responses of SBPs change with the directions of horizontal loadsFour model tests are conducted to preliminarily examine the effects of the skew angle of horizontal loadsSubsequently, the differences in the responses of the SBPs under horizontal loads in various directionsMoreover, an empirical design method is proposed based on the FE analysis results to predict the bearingThe method is confirmed to be effective, as confirmed by the close agreement between the predicting results

Keywords： single batter pile     skew horizontal load     model test     finite-element analysis     empirical design method    

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Equivalent linearization method based on assessment area in the analysis-design of pressure vessels

Yin Yihui,Yu Shaorong

Strategic Study of CAE 2008, Volume 10, Issue 10,   Pages 31-35

Abstract: Therefore, a more accurate method is presented in which the resorted stresses are obtained through two-dimensionelastic analytical solutions of a thick-walled spherical shell bearing internal pressure shows that the method

Keywords： pressure vessel     analysis-design     stress assorting     equivalent linearization method    

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Evaluation of the static and dynamic structural performance of segmental pre-stressed concrete box girder

Ali Fadhil NASER, Zonglin WANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 164-177 doi: 10.1007/s11709-013-0196-8

Abstract: methods which are used to improve the structural performance of the bridge structure, to analyze the static

Keywords： structural performance     steel plates     external pre-stressing     cracks     grouting method     static    

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Experimental study of wind loads on gable roofs of low-rise buildings with overhangs

Peng HUANG, Ling TAO, Ming GU, Yong QUAN

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 3,   Pages 300-317 doi: 10.1007/s11709-018-0449-7

Abstract:

Gable roofs with overhangs (eaves) are the common constructions of low-rise buildings on the southeastern coast of China, and they were vulnerable to typhoons from experience. The wind pressure distributions on gable roofs of low-rise buildings are investigated by a series of wind tunnel tests which consist of 99 test cases with various roof pitches, height-depth ratios and width-depth ratios. The block pressure coefficients and worst negative (block) pressure coefficients on different roof regions of low-rise buildings are proposed for the main structure and building envelope, respectively. The effects of roof pitch, height-depth ratio, and width-depth ratio on the pressure coefficients of each region are analyzed in detail. In addition, the pressure coefficients on the roofs for the main structure and building envelope are fitted according to roof pitch, height-depth ratio and width-depth ratio of the low-rise building. Meanwhile, the rationality of the fitting formulas is verified by comparing the fitting results with the codes of different countries. Lastly, the block pressure coefficients and worst negative pressure coefficients are recommended to guide the design of low-rise buildings in typhoon area and act as references for the future’s modification of wind load codes.

Keywords： low-rise building     gable roof     wind loads     wind tunnel test     block pressure coefficient     load code    

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Influence mechanism of dynamic and static liquid bridge forces on particle deposition behaviors in solar

Xueqing LIU, Xiaodong ZHAO, Luyi LU, Jianlan LI

Frontiers in Energy 2021, Volume 15, Issue 2,   Pages 499-512 doi: 10.1007/s11708-021-0742-3

Abstract: In this paper, the influence mechanism of the dynamic and static liquid bridge forces on particle depositionThe research results show that the static liquid bridge force can be the primary deposition force causing

Keywords： dust deposition     discrete element method (DEM)     photovoltaic mirrors     solar energy    

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Application of semi-analytical finite element method to analyze the bearing capacity of asphalt pavementsunder moving loads

Pengfei LIU, Dawei WANG, Frédéric OTTO, Markus OESER

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2,   Pages 215-221 doi: 10.1007/s11709-017-0401-2

Abstract: program SAFEM was developed with the objective of evaluating the dynamic response of asphalt under moving loadsand is based on a semi-analytic element method.SAFEM appears to be a feasible approach to determine the dynamic response of pavements under dynamic loads

Keywords： semi-analytical finite element method     bearing capacity     asphalt pavements     moving loads     dynamic response    

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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: enclosure was developed based on the building thermal network analytical theory and transfer function methodefficacy of the proposed model was demonstrated by comparing it with the complicated model — heat balance method

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

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Damage detection in beam-like structures using static shear energy redistribution

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 12,   Pages 1552-1564 doi: 10.1007/s11709-022-0903-4

Abstract: In this study, a static shear energy algorithm is presented for the damage assessment of beam-like structuresTherefore, the change in the static shear energy is employed to determine the damage locations in beam-likeThe static shear energy is derived from the spectral factorization of the elementary stiffness matrixsimulation and experiment examples indicate that the proposed algorithm provides a simple and effective method

Keywords： damage detection     beam structure     strain energy     static displacement variation     energy damage index    

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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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Integration of renewable energies, flexible loads and storages into the German power grid: Actual situation

Harald SCHWARZ, Xiaoshu CAI

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 107-118 doi: 10.1007/s11708-017-0470-x

Abstract: Starting from the late 1990’s, the German government decided to change the national electric power supply system dramatically. The main stimulating instrument was the German Law on Renewable Energies (Erneuerbare Energien Gesetz (EEG)), which guaranteed a fixed feed-in tariff to everyone who was willing to invest into renewable generation. Based on the year of commissioning, defined revenues per kWh were fixed for the next 20 years. Due to a very attractive over-funding, more than 1.5 million renewable generation units were connected to the German grid up to the end of 2015. According to the EEG, renewable generation units can feed to the grid wherever they are located and whenever they are able to produce. The old physical principle was and is still neglected, which clearly stated that generation always has to follow the demand—simply due to the limited availability of storages in the power system. Only in cases, when temporarily renewable overproduction exceeds the tolerable loading of lines or transformers respectively endangers the system stability in total, are German grid operators allowed to announce curtailments by emergency measures. Even in such cases, the “not produced energy” from renewable sources has to be funded. Although the installed capacity from renewables is much higher than the peak load in Germany, it contributes only about 32% to German average annual energy. Unfortunately, the regional distribution of renewable generation and load is very different, e.g. in the northeast of Germany, this Renewable Energy (RE)-ratio meanwhile exceeds 100% due to the high RE-penetration and low load. High transits of renewable overproduction from the north to the south will be necessary at nearly every day per year. Therefore, a tremendous change is needed within the German power grid. This paper will give a first overview followed by several others, describing possible solutions on how to overcome this critical situation.

Keywords： grid integration     renewable energies     system stability     storages     flexible loads     new market design    

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Development of an axial-type fan with an optimization method

Chong-hyun CHO, Soo-yong CHO, Chaesil KIM,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 414-422 doi: 10.1007/s11708-009-0038-5

Abstract: An axial-type fan that operates at a relative total pressure of 671Pa and a static pressure ofa flowrate of 416.6m/min is developed using an optimization technique based on the gradient methodThe total and static pressure are applied to the restriction condition with the operating flowrate onThrough these procedures, an initial axial-fan blade designed by the free vortex method is modified toThe experimental and numerical tests show that this optimization method can improve the efficiency and

Keywords： axial-type fan     gradient method     free-vortex method     design variable     total pressure     static pressure     operating    

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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: Thus, an analysis method different from that applied to conventional generators should be applied toIn 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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Title Author Date Type Operation

A Precision-Positioning Method for a High-Acceleration Low-Load Mechanism Based on Optimal Spatial and

Xin Chen,Youdun Bai,Zhijun Yang,Jian Gao,Gongfa Chen

Journal Article

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

Jianguo ZHANG , Ming GU ,

Journal Article

A FEniCS implementation of the phase field method for quasi-static brittle fracture

HIRSHIKESH, Sundararajan NATARAJAN, Ratna Kumar ANNABATTULA

Journal Article

Numerical analysis of bearing behaviors of single batter piles under horizontal loads in various directions

Journal Article

Equivalent linearization method based on assessment area in the analysis-design of pressure vessels

Yin Yihui,Yu Shaorong

Journal Article

Evaluation of the static and dynamic structural performance of segmental pre-stressed concrete box girder

Ali Fadhil NASER, Zonglin WANG

Journal Article

Experimental study of wind loads on gable roofs of low-rise buildings with overhangs

Peng HUANG, Ling TAO, Ming GU, Yong QUAN

Journal Article

Influence mechanism of dynamic and static liquid bridge forces on particle deposition behaviors in solar

Xueqing LIU, Xiaodong ZHAO, Luyi LU, Jianlan LI

Journal Article

Application of semi-analytical finite element method to analyze the bearing capacity of asphalt pavementsunder moving loads

Pengfei LIU, Dawei WANG, Frédéric OTTO, Markus OESER

Journal Article

A modified zone model for estimating equivalent room thermal capacity

Hua CHEN, Xiaolin WANG

Journal Article

Damage detection in beam-like structures using static shear energy redistribution

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

Integration of renewable energies, flexible loads and storages into the German power grid: Actual situation

Harald SCHWARZ, Xiaoshu CAI

Journal Article

Development of an axial-type fan with an optimization method

Chong-hyun CHO, Soo-yong CHO, Chaesil KIM,

Journal Article

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

Hao WANG, Fengge ZHANG, Tao GUAN, Siyang YU

Journal Article