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| 1 | Path Planning for Intelligent Robots Based on Deep Q-learning With Experience Replay and Heuristic Knowledge显示文摘Path planning and obstacle avoidance are two challenging problems in the study of intelligent robots. In this paper, we develop a new method to alleviate these problems based on deep Q-learning with experience replay and heuristic knowledge. In this method, a neural network has been used to resolve the 'curse of dimensionality' issue of the Q-table in reinforcement learning. When a robot is walking in an unknown environment, it collects experience data which is used for training a neural network;such a process is called experience replay.Heuristic knowledge helps the robot avoid blind exploration and provides more effective data for training the neural network. The simulation results show that in comparison with the existing methods, our method can converge to an optimal action strategy with less time and can explore a path in an unknown environment with fewer steps and larger average reward. | Lan Jiang Hongyun Huang Zuohua Ding | 2020 | IEEE/CAA Journal of Automatica Sinica2020，7，4： | 11 |
| 2 | Measurement of laminar burning velocities and analysis of flame stabilities for hydrogen-air-diluent premixed mixtures显示文摘The laminar burning velocities and Markstein lengths of the hydrogen-air-diluent mixtures were meas-ured at different equivalence ratios (0.4―1.5), different diluents (N2, CO2 and 15%CO2+85%N2) and di-lution ratios (0, 0.05, 0.10 and 0.15) by using the outwardly expanding flame. The influences of flame stretch rate on the flame propagation characteristics were analyzed. The results show that both the laminar burning velocities and the Markstein lengths of the hydrogen-air-diluent mixtures decrease with the increase of dilution ratio. The decrease in Markstein lengths means that adding diluents into the hydrogen-air mixtures will decrease the diffusional-thermal instability of the flame front. For a specified dilution ratio, the laminar burning velocities give their maximum values at an equivalence ratio of 1.8. The Markstein lengths increase with the increase of the equivalence ratio monotonously regardless of the diluents. The study shows that CO2 as the diluent has a greater impact on the laminar flame speed and the flame front stability than N2 as the diluent. | HU ErJiang HUANG ZuoHua HE JiaJia JIN Chun MIAO HaiYan WANG XiBin | 2009 | Chinese Science Bulletin2009，54，5： | 4 |
| 3 | Effect of 2,5-dimethylfuran addition on ignition delay times of n-heptane at high temperatures显示文摘The shock tube autoignition of 2,5-dimethylfuran (DMF)/n-heptane blends (DMF)/n-100%, by mole fraction) with equivalence ratios of 0.5, 1.0, and 2.0 over the temperature range of 1200-1800 K and pressures of 2.0 atm and 10.0 atm were investigated. A detailed blend chemical kinetic model resulting from the merging of validated kinetic models for the components of the fuel blends was developed. The experimental observations indicate that the ignition delay times nonlinearly increase with an increase in the DMF addition level. Chemical kinetic analysis including radical pool analysis and flux analysis were conducted to explain the DMF addition effects. The kinetic analysis shows that at lower DMF blending levels, the two fuels have negligible impacts on the consumption pathways of each other.As the DMF addition increases to relatively higher levels, the consumption path of n-heptane is significantly changed due to the competition of small radicals, which primarily leads to the nonlinear increase in the ignition delay times of DMF/n-heptane blends. | Zhenhua GAO Erjiang HU Zhaohua XU Geyuan YIN Zuohua HUANG | 2019 | Frontiers in Energy2019，13，3： | 4 |
| 4 | Experimental and analytical study on biodiesel and diesel spray characteristics under ultra-high injection pressure显示文摘 | Xiangang Wang Zuohua Huang Olawole Abiola Kuti Wu Zhang Keiya Nishida | 2010 | International Journal of Heat and Fluid Flow2010，，4： | 3 |
| 5 | Shock tube study on auto-ignition characteristics of kerosene/air mixtures显示文摘Ignition delay times are obtained for kerosene/air mixtures behind the reflected shock waves at temperatures between 1445 and 1650 K,at a pressure of 0.11 MPa and an equivalence ratio of 1.0.A nebulization device with Laval nozzle is used to nebulize kerosene and form an aerosol phase,which evaporates and diffuses rapidly behind the incident shock waves.Mixtures auto-ignite behind the reflected shock waves.An ICCD is used to visualize the kerosene/air mixture's ignition characteristics.The mixture's ignition intensity increases with increase in initial temperature.Continuous and irregular flames exist below 1515 K while plane and discontinuous flames exist over 1560 K.Ignition delay times decrease with increase in initial temperature.Experimental data shows good agreement with results reported previously in the literature.A new surrogate (consisting of 10% toluene,10% ethylbenzene and 80% n-decane) is proposed for kerosene.Honnet et al.'s mechanism is used to simulate the ignition of kerosene with calculations agreeing well with the experimental data.The sensitivity of reaction H+O2 <=>OH+O,which shows the highest sensitivity to the ignition delay time,increases with an increase in temperature.The chain breaching reaction of CH3 with O2 accelerates the total reaction rate and the H-atom abstraction of n-decane controls the total reaction rate.The rate of production and instantaneous heat production indicate that two reactions,H+O2 <=>OH+O and O+H2 <=>OH+H,are the key reactions to the formation of OH radicals,as well as the main endothermic reaction.However,the reaction of R3 is the main heat release reaction during ignition.Flame structure analysis shows that initial pressure is increased slightly as CO and H2O will appear before main ignition. | ZHANG YingJia HUANG ZuoHua WANG JinHua XU ShengLi | 2011 | Chinese Science Bulletin2011，56，13： | 2 |
| 6 | Experimental and kinetic study on ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures by shock tube显示文摘Ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures with hydrogen amount-of-substance fractions ranging from 0–20% were measured in a shock tube facility.The ambient temperature varied from 1422 to 1877 K and the pressure was maintained at 0.4 MPa behind the reflected shock wave.The experiments were conducted at an equivalence ratio of 2.0.The fuel mixtures were diluted with nitrogen gas so that the nitrogen amount-of-substance fraction was 95%.The experimental ignition delay time of the CH4/H2 mixture decreased as the hydrogen amount-of-substance fraction increased.The enhancement of ignition by hydrogen addition was weak when the ambient temperature was >1750 K,and strong when the temperature was <1725 K.The ignition delay time of 20% H2/80% CH4 was only one-third that of 100% CH4 at 1500 K.A modified model based on GRI-Mech 3.0 was proposed and used to calculate the ignition delay times of test mixtures.The calculated results agreed with the experimental ignition delay times.Normalized sensitivity analysis showed that HO·+H2 →H·+H2O was the main reaction for the formation of the H· at 1400 K.As the hydrogen amount-of-substance fraction increased,chain branching was enhanced through the reaction H·+O2→O·+HO·,and this reduced the ignition delay time.At 1800 K,the methyl radical (H3C·) became the key species that influenced the ignition of the CH4/H2/O2/N2 mixtures,and sensitivity coefficients of the chain termination reaction 2H3C·(+M)→C2H6(+M),and chain propagation reaction HO2+H3C·→HO·+CH3O decreased,which reduced the influence of hydrogen addition on the ignition of the CH4/H2 mixtures. | ZHANG YingJia HUANG ZuoHua WEI LiangJie NIU ShaoDong | 2011 | Chinese Science Bulletin2011，56，26： | 2 |
| 7 | An experimental study of premixed laminar methane/oxygen/argon flames doped with hydrogen at low pressure with synchrotron photoionization显示文摘Laminar premixed stoichiometric methane/hydrogen/oxygen/argon flames were investigated with tun- able synchrotron vacuum ultraviolet (VUV) photoionization and molecular-beam sampling mass spec- trometry techniques. The methane/hydrogen fuel blends with hydrogen volumetric fraction of 0, 20%, 40%, 60% and 80% were studied. All observed flame species, including stable intermediates and radi- cals in the flames, were detected by measuring photoionization mass spectra and photoionization effi- ciency (PIE) spectra. Mole fraction profiles of major species and intermediates were derived by scan- ning burner at some selected photon energies near ionization thresholds. The influence of hydrogen addition on mole fraction of major species and intermediates was analyzed. The results show that the major species mole fraction of CO, CO2 and CH4 decreases with the increase of hydrogen fraction. The mole fraction of intermediates measured in this experiment decreases remarkably with the increase of hydrogen fraction. This would be due to the increase of H and OH radicals by hydrogen addition and the high diffusivity and activity of H radical promoting the chemical reaction. In addition, the increase of H/C ratio with the increase of hydrogen fraction also leads to the decrease of the mole fraction of car- bon-related intermediates and contributes to the decrease of unburned and incomplete combustion products. | WANG JinHua HU ErJiana HUANG ZuoHua MA ZhiHao TIAN ZhenYu WANG Jina LI YuYana | 2008 | Chinese Science Bulletin2008，53，8： | 2 |
| 8 | Combustion behaviors of a compression-ignition engine fuelled with diesel/methanol blends under various fuel delivery advance angles显示文摘 | Zuohua Huang Hongbing Lu Deming Jiang Ke Zeng Bing Liu Junqiang Zhang Xibin Wang | 2004 | Bioresource Technology2004，，3： | 2 |
| 9 | Characterization of spray and combustion processes of biodiesel fuel injected by diesel engine common rail system显示文摘 | Olawole Abiola Kuti Jingyu Zhu Keiya Nishida Xiangang Wang Zuohua Huang | 2013 | Fuel2013，，： | 2 |
| 10 | Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures显示文摘Combustion characteristics of premixed diethyl ether-air mixtures were studied at different equivalence ratios and elevated initial pressures using schlieren photography and spherically propagating flame. Laminar burning velocities, Markstein number and critical radii at onset of cellular structure were obtained. The results show that an increase in initial pressure leads to a decrease in the unstretched laminar burning velocities. Laminar burning velocities give their peak values at the equivalence ratio of 1.1. Markstein number decrease with the increase of initial pressure and equivalence ratio, indicating that the instability of flame front is increased with the increase of initial pressure and equivalence ratio. The critical radii at onset of cellular flame structure are decreased with the increase of initial pressure. | ZHANG Ni DI YaGe HUANG ZuoHua ZHANG ZhiYuan | 2010 | Chinese Science Bulletin2010，55，3： | 1 |
| 11 | Experimental investigation on regulated and unregulated emissions of a diesel engine fueled with biodiesel from waste cooking oil 显示文摘 | DI Yage CHEUNG C S HUANG Zuohua | 2009 | Sci Total Environ2009，407，： | 1 |
| 12 | Combustion behaviors of a direct-injection engine operating on various fractions of natural gas-hydrogen blends显示文摘 | Wang Jinhua Huang Zuohua Fang Yu | 2007 | International Journal of Hydrogen Energy2007，32，15： | 1 |
| 13 | Spray Properties of Alternative Fuels:A Comparative Anal- ysis of Ethanol-gasoline Blends and Gasoline显示文摘 | GAO Jian JIANG Deming HUANG Zuohua | 2007 | Fu- el2007，86，10： | 1 |
| 14 | A review of engine application and fundamental study on turbulent premixed combustion of hydrogen enriched natural gas显示文摘The application and fundamental study on turbulent premixed combustion of hydrogen enriched natural gas is reviewed in this paper.Discussions include the combustion characteristics of direct injection engine fueled with hydrogen enriched natural gas,visualization study of direct injection combustion of hydrogen enriched natural gas using a constant volume vessel,and the fundamental study of turbulent premixed combustion of hydrogen enriched natural gas.The effect of additional hydrogen on the combustion process of natural gas engine is investigated from the fundamental view of the interaction between combustion reaction and turbulent flow. | WANG JinHua WEI ZhiLong ZHANG Meng HUANG ZuoHua | 2014 | Science China(Technological Sciences)2014，57，3： | 1 |
| 15 | Experi- mental and Kinetic Studies on Ignition Delay Times of Dimethyl Ether/N-Butane/O2/ArMixtures 显示文摘 | Hu Erjiang Jiang Xue Huang Zuohua et M | 2012 | Energy 8z Fuels2012，27，1： | 1 |
| 16 | Effect of n-pentanol addition on the combustion, performance and emission characteristics of a direct-injection diesel engine显示文摘 | Liangjie Wei C.S. Cheung Zuohua Huang | 2014 | Energy2014，，： | 1 |
| 17 | Combustion behaviors of a compression-ignition engine fuelled with diesel/methanol blends under various fuel delivery advance angles显示文摘 | Huang Zuohua Lu Hongbing Jiang Deming | 2004 | Bioresource Technology2004，95，3： | 1 |
| 18 | Effect of spark timing and load on a DISI engine fuelled with 2,5-dimethylfuran显示文摘 | Ritchie Daniel Guohong Tian Hongming Xu Miroslaw L. Wyszynski Xuesong Wu Zuohua Huang | 2010 | Fuel2010，，2： | 1 |
| 19 | Experimental study on engine performance and emissions for an engine fueled with natural gas-hydrogen mixtures 显示文摘 | HUANG Zuohua LIU Bin ZENG Ke | 2006 | Energy & Fuels2006，20，5： | 1 |
| 20 | Combustion characteristics of a direct injection engine fueled with natural gas: Hydrogen mixtures显示文摘 | HUANG Zuohua WANG Jirthua LIU Bing | 2006 | Energy and Fuels2006，20，2： | 1 |
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