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| 1 | Uncertain multiobjective redundancy allocation problem of repairable systems based on artificial bee colony algorithm显示文摘Based on the uncertainty theory, this paper is devoted to the redundancy allocation problem in repairable parallel-series systems with uncertain factors, where the failure rate, repair rate and other relative coefficients involved are considered as uncertain variables. The availability of the system and the corresponding designing cost are considered as two optimization objectives. A crisp multiobjective optimization formulation is presented on the basis of uncertainty theory to solve this resultant problem. For solving this problem efficiently, a new multiobjective artificial bee colony algorithm is proposed to search the Pareto efficient set, which introduces rank value and crowding distance in the greedy selection strategy, applies fast non-dominated sort procedure in the exploitation search and inserts tournament selection in the onlooker bee phase. It shows that the proposed algorithm outperforms NSGA-II greatly and can solve multiobjective redundancy allocation problem efficiently. Finally, a numerical example is provided to illustrate this approach. | Guo Jiansheng Wang Zutong Zheng Mingfa Wang Ying | 2014 | Chinese Journal of Aeronautics2014，27，6： | 5 |
| 2 | Development of an n -heptane- n -butanol-PAH mechanism and its application for combustion and soot prediction显示文摘 | Hu Wang Rolf Deneys Reitz Mingfa Yao Binbin Yang Qi Jiao Lu Qiu | 2012 | Combustion and Flame2012，，： | 2 |
| 3 | Research on Frequency Tracking Capacitive PWM of Induction Heating Power Supply 显示文摘 | Qinghua Xiao Jie Zhao Mingfa Wang | 2010 | International Conference on Challenges in Environmental Science and Computer Engineering (CESCE)2010，2，： | 1 |
| 4 | Development of an n-heptane-n-butanol-PAH mechanism and its appli- cation for combustion and soot prediction 显示文摘 | Wang Hu Reitz R D Yao Mingfa | 2013 | Combus- tion and Flame2013，160，： | 1 |
| 5 | Experimental Study Of N-butanol Additive and Multi-injection on HD Diesel Engine Performance and Emissions显示文摘 | Yao Mingfa Wang Hu Zheng Zunqing | 2010 | Fuel2010，89，9： | 1 |
| 6 | Experimental study of n-butanol additive and multi- injection on HD diesel engine performance and emissions显示文摘 | Yao Mingfa Wang Hu Zheng Zunqing | 2010 | Fuel2010，89，9： | 1 |
| 7 | Development of an n- heptane-n-butanol-PAH mechanism and its application for combustion and soot prediction 显示文摘 | WANG Hu REITZ R D YAO Mingfa | 2013 | Combustion and Flame2013，160，3： | 1 |
| 8 | EDOA: an efficient delay optimization approach for mixed-polarity Reed-Muller logic circuits under the unit delay model显示文摘Delay optimization has recently attracted signif-icant attention. However, few studies have focused on the delay optimization of mixed-polarity Reed-Muller (MPRM) logic circuits. In this paper, we propose an efficient delay op-timization approach (EDOA) for MPRM logic circuits under the unit delay model, which can derive an optimal MPRM logic circuit with minimum delay. First, the simplest MPRM expression with the fewest number of product terms is ob-tained using a novel Reed-Muller expression simplification approach (RMESA) considering don't-care terms. Second, a minimum delay decomposition approach based on a Huffman tree construction algorithm is utilized on the simplest MPRM expression. Experimental results on MCNC benchmark cir-cuits demonstrate that compared to the Berkeley SIS 1.2 and ABC, the EDOA can significantly reduce delay for most cir-cuits. Furthermore, for a few circuits, while reducing delay, the EDOA incurs an area penalty. | Zhenxue HE Limin XIAO Fei GU Li RUAN Zhisheng HUO Mingzhe LI Mingfa ZHU Longbing ZHANG Rui LIU Xiang WANG | 2019 | Frontiers of Computer Science2019，13，5： | 1 |
| 9 | Large eddy simulation of spray combustion using flamelet generated manifolds combined with artificial neural networks显示文摘In the present work,artificial neural networks(ANN)technique combined with flamelet generated manifolds(FGM)is proposed to mitigate the memory issue of FGM models.A set of ANN models is firstly trained using a 68-species mass fractions in mixture fraction-progress variable space.The ANN prediction accuracy is examined in large eddy simulation(LES)and Reynolds averaged Navier-Stokes(RANS)simulations of spray combustion.It is shown that the present ANN models can properly replicate the FGM table for most of the species mass fractions.The network models with relative error less than 5%are considered in RANS and LES to simulate the Engine Combustion Network(ECN)Spray H flames.Validation of the method is firstly conducted in the framework of RANS.Both non-reacting and reacting cases show the present method predicts very well the trend of spray and combustion process under different ambient temperatures.The results show that FGM-ANN can replicate the ignition delay time(IDT)and lift-off length(LOL)precisely as the conventional FGM method,and the results agree very well with the experiments.With the help of ANN,it is possible to achieve high efficiency and accuracy,with a significantly reduced memory requirement of the FGM models.LES with FGM-ANN is then applied to explore the detailed spray combustion process.Chemical explosive mode analysis(CEMA)approach is used to identify the local combustion modes.It is found that before the spray flame is developed to the steady-state,the high CH_(2)O zone is always associated with ignition mode.However,high CH_(2)O zone together with high OH zone is dominated by the burned mode after the steady-state.The lift-off position is dominated mainly by the diffusion mode. | Yan Zhang Shijie Xu Shenghui Zhong Xue-Song Bai Hu Wang Mingfa Yao | 2020 | Energy and AI2020，2，2： | 1 |
| 10 | Experimental study of n-butanol additive and multiinjection on HD diesel engine performance and emissions显示文摘 | Yao Mingfa Wang Hu Zheng Zunqing | | 0，，09： | 1 |
| 11 | Ex- perimental study of n-butanol additive and multi-injection on HD diesel engine performance and emissions 显示文摘 | Yao Mingfa Wang Hu Zheng Zunqing | 2010 | Fuel2010，，89： | 1 |
| 12 | A semi- detailed chemical kinetic model of a gasoline surrogate fuel for internal combustion engine applications显示文摘 | Wang Yifeng Yao Mingfa Zheng Zunqing | 2013 | Fuel2013，113，： | 1 |
| 13 | Experimental study of n-butanol additive and multi-injection on HD diesel engine performance and emissions显示文摘 | Yao Mingfa Wang Hu Zheng Zunqing | 2010 | Fuel2010，89，9： | 1 |
| 14 | Development of a simplified n-heptane/methane model for high-pressure direct-injection natural gas marine engines显示文摘High-pressure direct-injection (HPDI) of natu- ral gas is one of the most promising solutions for future ship engines, in which the combustion process is mainly controlled by the chemical kinetics. However, the employment of detailed chemical models for the multi-dimensional combustion simulation is significantly expensive due to the large scale of the marine engine. In the present paper, a reduced n-heptane/methane model consisting of 35-step reactions was constructed using multiple reduction approaches. Then this model was further reduced to include only 27 reactions by utilizing the HyChem (Hybrid Chemistry) method. An overall good agreement with the experimentally measured ignition delay data of both n-heptane and methane for these two reduced models was achieved and reasonable predictions for the measured laminar flame speeds were obtained for the 35-step model. But the 27-step model cannot predict the laminar flame speed very well. In addition, these two reduced models were both able to reproduce the experimentally measured in-cylinder pressure and heat release rate profiles for a HPDI natural gas marine engine, the highest error of predicted combustion phase being 6.5%. However, the engine-out CO emission was over-predicted and the highest error of predicted NOx emission was less than 12.9%. The predicted distributions of temperature and equivalence ratio by the 35-step and 27-step models are similar to those of the 334-step model. However, the predicted distributions of OH and CH2O are significantly different from those of the 334-step model. In short, the reduced chemical kinetic models developed provide a high-efficient and dependable method to simulate the characteristics of combustion and emissions in HPDI natural gas marine engines. | Jingrui LI Haifeng LIU Xinlei LIU Ying YE Hu WANG Xinyan WANG Hua ZHAO Mingfa YAO | 2021 | Frontiers in Energy2021，15，2： | 1 |
| 15 | Experimental study of n-butanol additive and multi-injection on HD diesel engine performance and emissions显示文摘 | Mingfa Yao Hu Wang Zunqing Zheng Yan Yue | 2010 | Fuel2010，，9： | 1 |
| 16 | Research on Fre- quency Tracking Capacitive PWM of Induction HeatingPower Supply 显示文摘 | Qinghua Xiao Jie Zhao Mingfa Wang | 2010 | International Conference on Challenges in Environmental Science and Computer Engineering (CESCE)2010，2，： | 1 |
| 17 | Development of an n-heptane-n-butanol-PAH mechanism and its application for combustion and soot prediction显示文摘 | Wang Hu Reitz RolfD Yao Mingfa | 2013 | Combustion and Flame2013，160，3： | 1 |
| 18 | Development of an n-heptane-n-butanol-PAH mechanism and its application for combustion and soot prediction显示文摘 | Hu Wang Rolf Deneys Reitz Mingfa Yao | 2013 | Combustion and Flame2013，160，： | 1 |
| 19 | Experimental study of n-butanol additive and multi-injection on HD diesel engine performance and emissions显示文摘 | Mingfa Yao Hu Wang Zunqing Zheng Yan Yue | 2010 | Fuel2010，，9： | 1 |
| 20 | Molecular investigation on the compatibility of epoxy resin with liquid oxygen显示文摘Conventional fiber reinforced plastics(FRPs)have compatibility issues with solid oxygen while used as a fuel tank,which might cause combustion and explosion.To study the compatibility of different epoxy resins with liquid oxygen,molecular dynamics was used to simulate the phase changes of cross-linked epoxy resins under the impact of solid oxygen.Three curing resin systems,which are bisphenol A epoxy resin(DGEBA),bisphenol F epoxy resin(DGEBF),and tetrahydrophthalate diglycidyl ester(epoxy resin 711),are modeled to investigate the rational material system for the application of fuel tanks in launching vehicles.The simulation results show that the order of solid oxygen compatibility of these epoxy resins is DGEBA>DGEBF>epoxy resin 711 at the same density of crosslinking.The selection of curing agent also has an impact on the compatibility,with the same epoxy,diaminodiphenyl methane(DDM)has more advanced performance comparing to diaminodiphenyl sulfone(DDS). | Mingfa Ren Lei Wang Tong Li Bingqing Wei | 2020 | Theoretical & Applied Mechanics Letters2020，10，1： | 1 |
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