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10th Asia-Pacific Conference on Combustion, ASPACC 2015

作者： Lim, S.J. Kim, M.K. Park, J. Fujita, O. Chung, S.H. Interdisciplinary Program of Biomechanical Engineering Pukyong National University Busan Korea Republic of Environmental and Energy System Research Division Korea Institute of Machinery and Materials Daejeon Korea Republic of Department of Mechanical Engineering Pukyong National University Busan Korea Republic of Division of Mechanical and Science Hokkaido University Sapporo Japan Clean Combustion Research Center King Abdullah University of Science and Technology Thuwal Saudi Arabia

The effect of applied electric fields on the spreading flame over slanted Polyethylene (PE) insulated electrical wire was investigated experimentally by varying the AC frequency and voltage. The result showed that the spread rate of downwardly spreading flame decreased in increase of voltage and frequency, while that of upward flame spread rate exhibited complicated behavior with applied voltage and frequency. Downwardly spreading flame size became smaller in increase of applied voltage and frequency, while the flame leaned toward burnt side. When the flame spread upwardly, the flame size experienced large variation with applied voltage and frequency. Such flames leaned toward unburned side. Based on flame shape and the slanted direction of flame, the flame spread rate could be explained by thermal balance mechanism.

关键词： Electric fields

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The electric field distribution of a hybrid rectangular and circular waveguide resonator for use in granular material dielectric measurements

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IEEJ Transactions on Fundamentals and Materials 2015年第8期135卷 439-449页

作者： Kittiamornkul, Navapadol Jirasereeamornkul, Kamon Kiattisin, Supaporn Chamnongthai, Kosin Higuchi, Kohji Department of Electronic and Telecommunication Engineering King Mongkut's University of Technology Thonburi 126 Bangmod Tungkru Bangkok10140 Thailand Technology of Information System Management Program Faculty of Engineering Mahidol University 999 Salaya Nakhon Pathom73170 Thailand Department of Mechanical Engineering University of Electro-Communications 1-5-1 Chofugaoka Chofu182-8585 Japan

This paper represents a design for a hybrid rectangular and circular waveguide resonator. The resonator is designed specifically for the purpose of granular dielectric measurements, which resonates at 2.45 GHz. The electric field distributions of the proposed resonator will be compared against ordinary resonators, and illustrated using a 3D computer simulation of isosurfaces and their contours and 3D projections. In this simulation the properties of samples (paddies and soils) are loaded into each design, in order to observe the electrical field distributions of each sample. Next, the probability density functions (PDF) and cumulative distribution functions (CDF) shall be used to determine the probability of electric field distributions within each type of resonator. Each designed resonator was created in order to process real experiment circumstances. The experiments for each resonator were processed using 20 paddy samples and 20 soil samples, in order to replicate real circumstances in an efficient manner. The percentages of moisture content (%MC) from each design were compared against %MC obtained using dry weight methodology, used to find errors. From the results, mean square error (MSE) shows that the hybrid resonator can improve output greater than the ordinary resonators, which are the rectangular resonator and circular resonator, with 78.738% and 63.213% respectively for paddy sample, and 70.605% and 46.520% respectively for soil sample, respectively. This demonstrates that the proposed resonator creates better results than the ordinary resonators, although the sample is changed. © 2015 The Institute of Electrical Engineers of Japan.

关键词： Moisture

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Integrating artificial neural networks and cluster analysis to assess energy efficiency of buildings

Integrating artificial neural networks and cluster analysis ...

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IIE Annual Conference and Expo 2014

作者： Aqlan, Faisal Ahmed, Abdulaziz Srihari, Krishnaswami Khasawneh, Mohammad T. Industrial and System Engineering Program Department of Mechanical Civil and Environmental Engineering University of New Haven West HavenCT06516 United States Department of Systems Science and Industrial Engineering State University of New York at Binghamton BinghamtonNY13902 United States

ISBN: (纸本)9780983762430

Energy consumption of buildings worldwide has steadily increased over the past couple of decades. Furthermore, energy performance of buildings is one of the factors that contribute to energy waste and its perennial adverse impact on the environment. This paper presents a data mining approach for assessing the heating and cooling requirements of residential buildings. The proposed approach combines Artificial Neural Networks (ANNs) and cluster analysis to assess and predict the heating and cooling energy efficiency of residential buildings. The ANN-based model uses eight input variables (i.e., relative compactness, surface area, wall area, roof area, overall height, orientation, glazing area, and glazing area distribution) to predict both the heating and cooling loads of residential buildings. Buildings are then clustered based on the output variables using the K-means clustering method. The proposed approach is used to assess and evaluate 768 diverse residential buildings based on simulated literature data. The research results showed that the proposed approach can effectively predict the heating and cooling requirements of residential buildings based on the input variables considered with a very high level of accuracy.

关键词： Energy efficiency

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A Methodology for Longitudinal Tooth Flank Crowning of the Helical Gear on a CNC Honing Machine

A Methodology for Longitudinal Tooth Flank Crowning of the H...

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2014 2nd International Conference on Future Materials engineering and Industry Application(ICFMEIA 2014)

作者： Van-The Tran Ruei-Hung Hsu Chung-Biau Tsay Program of Mechanical and Aeronautical Engineering Feng Chia University Program in Precision System Design Feng Chia University Department of Mechanical and Computer-Aided Engineering Feng Chia University

The gear honing is the most economical way for hard finishing an involute helical gear after hobbing and heat treatment or after shaving and heat treatmentThe gear honing can also be applied to the modification of gear tooth surfaces to compensate for the distortions that occur during heat treatment processMost published papers on the technology of gear honing describes on the principle of generated gear surfaceHowever, the longitudinal tooth flank crowning of a helical gear with honing has not been investigated yetTherefore, in this paper, we proposed a novel method for longitudinal tooth flank crowning of work gear surfaces by setting a crossed angle between the honing cutter and work gear axes as a linear function of honing cutter's traverse feed in the honing processA mathematical model for the tooth profile of work gear honed by a standard honing cutter is also establishedThree numeral examples are presented to illustrate and verify the merits of the proposed gear honing method in longitudinal crowning.

关键词： Gear honing Longitudinal crowning Tooth flank Helical gear Mathematical model

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Cost optimization with solar and conventional energy production, energy storage, and real time pricing

Cost optimization with solar and conventional energy product...

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2014 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2014

作者： Raziei, Ata Hallinan, Kevin P. Brecha, Robert J. Department of System and Engineering Management University of Dayton Dayton OH United States Department of Mechanical and Aerospace Engineering University of Dayton Dayton OH United States Department of Physics and Renewable and Clean Energy Program University of Dayton Dayton OH United States

ISBN: (纸本)9781479936526

Research is presented that investigates the potential for solar power generation with battery energy storage for reducing the effective cost of energy delivered to residential customers if real time pricing is present. A linear optimization approach is developed based upon a two-step process. In step one, given a specified solar array area and battery capacity, the optimal means to meet loads based upon grid power, solar power, and/or battery power is determined. This analysis considers an expected life-span of the solar panel. With these results established, in the next step, the capital costs for the solar arrays and batteries are considered for each point (solar area and battery capacity) in the design space. Ultimately, the results illuminate the most cost effective means to provide power to customers for the chosen system. © 2014 IEEE.

关键词： Solar power generation

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Probabilistic Fracture Mechanics Assessment of Piping Welds in A Nuclear Power Plant

Probabilistic Fracture Mechanics Assessment of Piping Welds ...

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2014海峡两岸破坏科学与材料试验学术会议暨第十二届破坏科学研讨会/第十届全国MTS材料试验学术会议

作者： R.F.Liu C.C.Huang C.C.Chen C.L.Fuang T.S.Yang Mechanical and System Engineering Program Institute of Nuclear Energy Research Department of Nuclear Generation Taiwan Power Company

This paper is to perform a probabilistic fracture mechanics assessment of piping welds in a nuclear power plant with considering residual stress *** assess the structural integrity objectively,the probabilistic fracture mechanics analysis code for nuclear piping is employed to estimate the leak probabilities of the *** the aging related degradation mechanism,crack growth rates in the welds subjected to fatigue and stress corrosion cracking are applied in Monte Carlo *** order to verify the influence of overlay welding on stress improvement,a series of residual stress distributions in the welds are determined using the Finite Element *** geometries,material properties and operating loads of the piping system are based on those in the piping stress *** results show that the leak probabilities increase with operating loads are significantly related to welding residual *** compressive stresses at the inner surface of original pipe,weld overlay is an efficient way to avoid crack propagation during subsequent *** addition,the leak probability distributions can be regarded as the important factors for structural safety and operational stability evaluation of the piping system.

关键词： Probabilistic fracture mechanics,Weld overlay,Residual stress influence

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Optimal Maintenance Time under Imperfect Preventive Maintenance 2

Optimal Maintenance Time under Imperfect Preventive Maintena...

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2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014

作者： Coque, M.A. Souza, G.F.M. Mechanical Engineering Graduate Program University of São Paulo Cidade Universitária São Av Prof. Mello Moraes São Paulo SP2231 Brazil Mechatronics and Mechanical System Engineering Department University of São Paulo Cidade Universitária Av Prof Mello Moraes São Paulo SP2231 Brazil

ISBN: (纸本)9780784413609

The preventive maintenance (PM) is scheduled periodically to restore the system condition. However, PM activities cannot generally restore the system to as good as new condition but in an intermediate situation, which is called imperfect PM. The PM interval optimization is useful for improving system reliability. A popular approach to optimization interval is minimizing the maintenance costs. The goal of this work is to obtain optimal PM intervals that minimize expected cost considered PM imperfect, in other words we obtain the optimal PM intervals assuming that the PM action restores the system operating state to be somewhere between as good as new and as bad as old. The results are applied in a real data and the PM is maintained at a decreasing sequence of intervals, which is more practical since most systems need more frequent maintenance with increased usage and age. Furthermore consider a wrong PM perfect hypotheses increase the maintenance cost substantially. © 2014 American Society of Civil Engineers.

关键词： Preventive maintenance

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Probabilistic Fracture Mechanics Assessment of Piping Welds in A Nuclear Power Plant

Probabilistic Fracture Mechanics Assessment of Piping Welds ...

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2014年海峡两岸破坏科学与材料试验学术会议暨第十二届破坏科学研讨会、第十届全国MTS材料试验学术会议

作者： R.F.Liu C.C.Huang C.C.Chen C.L.Fuang T.S.Yang Department of Nuclear Generation Taiwan Power Company Taipei Mechanical and System Engineering Program Institute of Nuclear Energy Research Taoyuan

This paper is to perform a probabilistic fracture mechanics assessment of piping welds in a nuclear power plant with considering residual stress *** assess the structural integrity objectively, the probabilistic fracture mechanics analysis code for nuclear piping is employed to estimate the leak probabilities of the *** the aging related degradation mechanism, crack growth rates in the welds subjected to fatigue and stress corrosion cracking are applied in Monte Carlo *** order to verify the influence of overlay welding on stress improvement, a series of residual stress distributions in the welds are determined using the Finite Element *** geometries, material properties and operating loads of the piping system are based on those in the piping stress *** results show that the leak probabilities increase with operating loads are significantly related to welding residual *** compressive stresses at the inner surface of original pipe, weld overlay is an efficient way to avoid crack propagation during subsequent *** addition, the leak probability distributions can be regarded as the important factors for structural safety and operational stability evaluation of the piping system.

关键词： Probabilistic fracture mechanics Weld overlay Residual stress influence

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Abstracts from Hydrocephalus 2016 Abstracts

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FLUIDS AND BARRIERS OF THE CNS 2017年第SUPPL 1期14卷 1-21页

作者： [Anonymous] Johns Hopkins University Baltimore MD USA. Department of Neurosurgery Johns Hopkins University Baltimore MD USA. Johns Hopkins Biostatistics Center Johns Hopkins Bloomberg School of Public Health Baltimore MD USA. Johns Hopkins Bloomberg School of Public Health Baltimore MD USA. Department of Neurosurgery Johns Hopkins University School of Medicine Baltimore MD USA. Johns Hopkins Aramco Healthcare Dhahran Saudi Arabia. Johns Hopkins Hopkins Aramco Healthcare Dhahran Saudi Arabia. Johns Hopkins Aramco Healthcare Ras Tanura Saudi Arabia. Primary Care Johns Hopkins Aramco Healthcare Ras Tanura Saudi Arabia. Bloomberg School of Public Health Johns Hopkins University Baltimore MD USA. Department of Neurosurgery Rhode Island Hospital Providence RI USA. Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Baltimore MD USA. The Interface Group Institute of PhysiologyUniversity of Zurich Zurich Switzerland. Institute of Physiology University of Zurich Zurich Switzerland. Neuroscience Center Zurich and the Zurich Center for Integrative Human Physiology University of Zurich Zurich Switzerland. BioFlowImage Laboratory University of Picardie Jules Verne Amiens France. Reims Mathematics Laboratory University of Reims Champagne-Ardenne Reims France. Image Processing Laboratory University Hospital of Amiens-Picardie Amiens France. BioFlowImage Laboratory Department of Medical Image Processing University Hospital of Picardie Jules Verne Amiens France. Department of Geriatric University Hospital of Toulouse Toulouse France. Departments of Geriatric University Hospital of Toulouse Toulouse France. Department of Geriatry University Hospital Toulouse Toulouse France. Neurosciences department University of Cambridge Cambridge UK. Brain Physics Lab Academic Neurosurgery University of Cambridge Cambridge UK. Department of Nuclear Medicine University Hospital of Toulouse Toulouse France. Department of Nuclear Medicine University Hospit

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An ergonomic study for 6s workplace improvement

An ergonomic study for 6s workplace improvement

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IIE Annual Conference and Expo 2014

作者： Aqlan, Faisal Lam, Sarah S. Ramakrishnan, Sreekanth Testani, Michael Industrial and System Engineering Program Department of Mechanical Civil and Environmental Engineering University of New Haven West HavenCT06516 United States Department of Systems Science and Industrial Engineering State University of New York at Binghamton BinghamtonNY13902 United States IBM Corporation WalthamMA02451 United States IBM Corporation EndicottNY13760 United States

ISBN: (纸本)9780983762430

This paper presents a workplace ergonomic study in a high-end server manufacturing environment to assess ergonomics risks and enhance the Lean transformation. Operators perform heavy and repetitive lifting and movement of products could place stress on their back and upper extremities. Forceful exertions to move a manual forklift in the workplace area could lead to fatigue and possible damage to muscles and other tissues. The objective of this study is to reduce ergonomics risks to an acceptable level and provide operators with the right tools and proper work environment. Digital human modeling based on the Jack software, is used for risk assessment. Results are analyzed to provide proper solutions. Ergonomic risks assessed include: force and posture risks, noise, vibration, temperature, and illumination. Lean process is implemented in the workplace to reduce the Lean wastes that include waiting time, transportation, and non-value-add processes. Ergonomic improvements are introduced to complement and support the Lean process implementation. Three main ergonomic risks are found to be high and could affect the operators: energy expenditure, posture, and back force. Several modifications are implemented to reduce these risks: the manual forklift is replaced with an automated forklift that is easy to move and requires less human effort, the workplace area is expanded to provide more work space, and the operators are provided with proper tools to perform the task without risk.

关键词： Manufacture

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