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| 1 | Controlling N-doping type in carbon to boost single-atom site Cu catalyzed transfer hydrogenation of quinoline显示文摘Single-atom site(SA)catalysts on N-doped carbon(CN)materials exhibit prominent performance for their active sites being M-Nx.Due to the commonly random doping behaviors of N species in these CN,it is a tough issue to finely regulate their doping types and clarify their effect on the catalytic property of such catalysts.Herein,we report that the N-doping type in CN can be dominated as pyrrolic-N and pyridinic-N respectively through compounding with different metal oxides.It is found that the proportion of distinct doped N species in CN depends on the acidity and basicity of compounded metal oxide host.Owing to the coordination by pyrrolic-N,the SA Cu catalyst displays an enhanced activity(two-fold)for transfer hydrogenation of quinoline to access the valuable molecule tetrahydroquinoline with a good selectivity(99%)under mild conditions.The higher electron density of SA Cu species induced by the predominate pyrrolic-N coordination benefits the hydrogen transfer process and reduces the energy barrier of the hydrogenation pathway,which accounts for the improved catalytic effeciency. | Jian Zhang Caiyan Zheng Maolin Zhang Yajun Qiu Qi Xu Weng-Chon Cheong Wenxing Chen Lirong Zheng Lin Gu Zhengpeng Hu Dingsheng Wang Yadong Li | 2020 | Nano Research2020，13，11： | 29 |
| 2 | Multiple Fading Factors Kalman Filter for SINS Static Alignment Application显示文摘解决当系统模型和随机的信息精确地是未知的时,标准 Kalman 过滤器不能给最佳的答案的问题,单个褪色因素 Kalman 过滤器对简单系统合适。要不是有多变量的复杂系统,把单个褪色的因素用作不能是足够的一更多样地为协变性矩阵。在这份报纸,过滤算法的新多重褪色因素 Kalman 被介绍。由用开窗术计算革新顺序协变性的不偏的估计,褪色的因素矩阵被获得。用使因素矩阵褪色调整预言错误 Pk|k-1 的协变性矩阵,算法提供为不同过滤器隧道褪色的不同的率。建议算法被用于 strapdown 惯性的航行系统(罪恶) 起始的排列,和模拟和试验性的结果表明那,当实际系统噪音特征与预设值不同时,排列精确性能戏剧性地被升级。新算法对无常噪音不太敏感并且有参数的更好的评价效果。因此,它具有在实际应用的重要价值。 | GAO Weixi MIAO Lingjuan NI Maolin | 2011 | Chinese Journal of Aeronautics2011，24，4： | 27 |
| 3 | Adaptive guidance law design based on characteristic model for reentry vehicles显示文摘In this paper an adaptive guidance law based on the characteristic model is de-signed to track a reference drag acceleration for reentry vehicles like the Shuttle. The characteristic modeling method of linear constant systems is extended for single-input and single-output (SISO) linear time-varying systems so that the characteristic model can be established for reentry vehicles. A new nonlinear dif-ferential golden-section adaptive control law is presented. When the coefficients belong to a bounded closed convex set and their rate of change meets some con-straints, the uniformly asymptotic stability of the nonlinear differential golden-sec- tion adaptive control system is proved. The tracking control law, the nonlinear differential golden-section control law, and the revised logical integral control law are integrated to design an adaptive guidance law based on the characteristic model. This guidance law overcomes the disadvantage of the feedback lineariza-tion method which needs the precise model. Simulation results show that the proposed method has better performance of tracking the reference drag accel-eration than the feedback linearization one. | YANG JunChun HU Jun NI MaoLin | 2008 | Science in China(Series F)2008，51，12： | 12 |
| 4 | Pd-Ag alloy hollow nanostructures with interatomic charge polarization for enhanced electrocatalytic formic acid oxidation显示文摘蚁的酸氧化是在膜(PEM ) 燃料细胞,活跃地点和种吸附 / 激活在玩调音的 protonexchange 的重要 electrocatalytic 反应角色。在这研究,我们为申请与高活跃的表面区域开发了空 Pd-Ag 合金 nanostructures 到 electrocatalytic 蚁的酸氧化。当 Ag 的某个数量被合并到 Pd 时格子,已经是为蚁的酸氧化的高度活跃的材料, electrocatalytic 活动能显著地被增加。是由理论模拟显示了,在 Pd 和 Ag 之间联合在 Pd 催化地点上导致极化费用,它能提高 HCOO 的吸附 * 种类。作为结果,设计 electrocatalysts 能完成减少的 Pd 用法并且同时提高催化性质。这研究代表同时制作空结构增加活跃地点的数字并且利用 interatomic 相互作用向改进 electrocatalytic 性能调节种类吸附 / 激活的一条途径。 | Dong Liu Maolin Xie Chengming wang Lingwen Liao Lu Qiu Jun Ma Hao Huang Ran Long Jun Jiang Yujie Xiong | 2016 | Nano Research2016，9，6： | 11 |
| 5 | Research on Low Cycle Fatigue Reliability-based Robust Design Optimization of Turbine Blade显示文摘针对涡轮叶片低周疲劳可靠性稳健设计优化问题,对叶片材料进行了高温疲劳试验,采用定量方程随机化方法处理试验数据,获得叶片材料的概率-应变-寿命曲线。采用贝塞尔曲线描述叶片型线方程,建立了涡轮叶片结构及流场的参数化模型,采用热-流-固耦合有限元法对涡轮流场和叶片进行了数值分析,得到叶片动能效率和应力应变分布特性。建立了叶片疲劳可靠性稳健设计优化模型,并采用响应面法获得叶片结构性能函数和极限状态函数,将叶片低周疲劳可靠性作为基本约束条件,采用序列二次规划优化法得到设计优化结果。研究结果表明,优化后的叶片低周疲劳可靠性以及稳健性显著提高,模型及方法正确可行,可用于涡轮叶片以及其他复杂结构的低周疲劳可靠性稳健设计优化。 | PENG Maolin YANG Zichun CAO Yueyun CHU Zhuli | 2013 | 中国电机工程学报2013，33，11： | 8 |
| 6 | Study on air flow dynamic characteristic of mechanical ventilation of a lung simulator显示文摘As an important life support treatment, mechanical ventilation is usually adopted in clinics. With the development of the res-piratory diagnostic and treatment technologies, air flow dynamics of mechanical ventilation is usually referenced in the evaluation of pulmonary status and assessment of respiratory therapy. In order to improve the ventilation efficiency and provide a reference for pulmonary diagnostics, in this paper, a new mathematical model of mechanical ventilation system was set up. Furthermore, a prototype mechanical ventilation system for an artificial simulating lung was designed and experimentally studied. Lastly, in order to improve the ventilation efficiency and provide a reference for pulmonary diagnostics, the air flow dynamics of the mechanical ventilation system was illustrated through simulation and experimental studies. The study can be helpful to the optimization of the mechanical ventilation system. | NIU JingLong SHI Yan CAO ZhiXin CAI MaoLin CHEN Wei ZHU Jian XU WeiQing | 2017 | Science China(Technological Sciences)2017，60，2： | 8 |
| 7 | New advances in in-situ thermal desorption technology for contaminated soil显示文摘With the development of ecological civilization and economic construction,remediation of contaminated soils has caused more and more concern of scientists and engineers.Situ thermal desorption is a mature and effective technology which is especially suitable for the contaminated soil of relocated chemical plant[1,2],Compared with in-situ chemical oxidation and ectopic thermal desorption,the in-situ thermal desorption has stronger applicability and higher repair efficiency.The main applications of the in-situ thermal desorption technology are semi-volatile and volatile organic pollutants. | SHI Yan LUO ZiHao WANG YiXuan CAI MaoLin YANG LiMan | 2019 | Science China(Technological Sciences)2019，62，11： | 7 |
| 8 | Overall Life Cycle Comprehensive Assessment of Pneumatic and Electric Actuator显示文摘Pneumatic actuators and electric actuators have almost been applied to all manufacturing industries.The two kinds of actuators can replace each other in most fields,such as the point to point transmission occasion and some rotating occasions.However,there are very few research results about the advantages and disadvantages of two kinds of actuators under the same working conditions so far.In this paper,a novel comprehensive assessment method,named as overall life cycle comprehensive assessment(OLCCA),is proposed for comparison and assessment of pneumatic and electric actuators.OLCCA contains mechanical properties evaluation(MPE),life cycle cost analysis based on users(LCCABOU)and life cycle environmental impact analysis(LCEIA)algorithm in order to solve three difficult problems:mechanical properties assessment,cost analysis and environmental impact assessment about actuators.The mechanical properties evaluation of actuators is a multi-objective optimization problem.The fuzzy data quantification and information entropy methods are combined to establish MPE algorithm of actuators.Two kinds of pneumatic actuators and electric actuators with similar bearing capacity and similar work stroke were taken for example to verify the correctness of MPE algorithm.The case study of MPE algorithm for actuators verified its correctness.LCCABOU for actuators is also set up.Considering cost complex structure of pneumatic actuators,public device cost even method(PDCEM)is firstly presented to solve cost division of public devices such as compressors,aftercooler,receivers,etc.LCCABOU method is also effective and verified by the three groups of pneumatic actuators and electric actuators.Finally,LCEIA model of actuators is established for the environmental impact assessment of actuators.LCEIA data collection method and model establishment procedure for actuators are also put forward.With Simapro 7,LCEIA comparison results of six actuators can be obtained:Fossil fuels are the major environmental factor of pneumatic and electric actuators;Environmental impact of electric actuator is large than one of pneumatic actuator under the similar mechanical properties and working conditions of pneumatic and electric actuators.The results are correct and correspond with the actual mechanical properties of actuators.This paper proposes a comprehensive evaluation method of the actuators,which can solve the critical problem that similar electromechanical products are very difficult to be compared with each other from the angle of performance,cost and environment impact. | ZHANG Yeming CAI Maolin | 2014 | Chinese Journal of Mechanical Engineering2014，27，3： | 7 |
| 9 | Stability test of fractional-delay systems via integration显示文摘This paper focuses on the stability testing of fractional-delay systems. It begins with a brief introduction of a recently reportedalgorithm, a detailed demonstration of a failure in applications of the algorithm and the key points behind the failure. Then,it presents a criterion via integration, in terms of the characteristic function of the fractional-delay system directly, for testingwhether the characteristic function has roots with negative real parts only or not. As two applications of the proposed criterion,an algorithm for calculating the rightmost characteristic root and an algorithm for determining the stability switches, are proposed.The illustrative examples show that the algorithms work effectively in the stability testing of fractional-delay systems. | WANG ZaiHua DU MaoLin SHI Min | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，10： | 7 |
| 10 | Energy conversion characteristics of reciprocating piston quasi- isothermal compression systems using water sprays显示文摘Air compressors are vital and have numerous industrial applications. Approximately 8% of the annual operating electricity consumption in industrial countries is constituted by due to the use of air compressors. Because the poor heat transfer to the environment in the rapid compression process, the compression is non-isothermal, the efficiency of compressors is restricted. To improve their efficiency and achieve isothermal compression, this study proposes energy conversion reciprocating piston quasiisothermal compression using a water spray. First, a mathematical model of a reciprocating piston compressor with water sprays was established. Through experimental investigation and simulations, the mathematical model was validated. The energy conversion characteristics of the reciprocating piston compressor were then studied. To reduce compression power and enhance compression efficiency, it was first discovered that the critical parameters were the input pressure of the driving chamber, water spray mass, and compression volume ratio, which were then evaluated thoroughly. The higher the inlet pressure of the driving chamber, the faster the air compression velocity. Additionally, the compression efficiency was elevated as the water spray mass was gradually increased for a given compression volume ratio. When the compression volume ratio was increased from 2 to 3,the compression power increased from 172.7 J/stroke to 294.2 J/stroke and the compression efficiency was enhanced from 37.3%(adiabatic) to 80.6%. This research and its performance analysis can be referred to during the parameter design optimisation of reciprocating piston quasi-isothermal compression systems using water sprays. | jia guanwei cai maolin xu weiqing shi yan | 2018 | Science China(Technological Sciences)2018，61，2： | 6 |
| 11 | Crystal structure of SARS-CoV-2 main protease in complex with protease inhibitor PF-07321332显示文摘Dear Editor,Since December 2019,the pandemic of coronavirus disease 2019(COVID-19)has taken a heavy toll on global health,creating an urgent need to develop effective strategies for prevention and treatment.The etiological agent,known as severe acute respiratory syndrome coronavirus 2(SARSCoV-2),has infected nearly 229.2 million people worldwide with more than 4.7 million deaths as of September 15,2021.Older age and preexisting health conditions are associated with worse clinical prognosis including higher mortality rates(Zhou et al.,2020).The global race to combat this pandemic has led to rapid deployment of numerous effective vaccines against SARS-CoV-2(Tregoning et al.,2021).However,the emergence of viral variants,including the Delta variant(B.1.617.2),compromised vaccine effectiveness with resurgence of SARS-CoV-2 infection among highly vaccinated population(Keehner et al.,2021).Therefore,development of therapeutics against the more conserved viral targets would be essential to contain the spread of COVID-19 and reduce mortality. | Yao Zhao Chao Fang Qi Zhang Ruxue Zhang Xiangbo Zhao Yinkai Duan Haofeng Wang Yan Zhu Lu Feng Jinyi Zhao Maolin Shao Xiuna Yang Leike Zhang Chao Peng Kailin Yang Dawei Ma Zihe Rao Haitao Yang | 2022 | Protein & Cell2022，13，9： | 6 |
| 12 | Feedback minimization of first-passage failure of quasi integrable Hamiltonian systems显示文摘为最小化伪 integrable Hamiltonian 系统(点亮水坝砰和弱随机的刺激的 multi-degree-of-freedom integrable Hamiltonian 系统题目) 的第一经过的失败的非线性的随机的最佳的控制策略被建议。为一个控制伪 integrable Hamiltonian 系统的运动的方程被使用随机的平均方法归结为一套平均 Itô 随机的微分方程。然后,动态编程方程和他们的联系边界和期末考试为可靠性的最大化的控制问题预定条件,吝啬的第一经过的时间被提出。最佳的控制法律从动态编程方程和控制限制被导出。为这些控制问题的最后的动态编程方程被决定,他们到管理有条件的可靠性的向后的 Kolmogorov 方程的关系工作,管理吝啬的第一经过的时间的 Pontryagin 方程独立被建立。有条件的可靠性功能和控制系统的吝啬的第一经过的时间被解决最后的动态编程方程和 Pontryagin 方程获得。一个例子被举说明建议控制策略的应用程序和有效性。 | Maolin Deng Weiqiu Zhu Department of Mechanics,State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou 310027,China | 2007 | Acta Mechanica Sinica2007，23，4： | 6 |
| 13 | Plant microremains provide direct evidence for the functions of stone knives from the Lajia site, northwestern China显示文摘A large number of stone knives have been recovered from Neolithic archaeological sites in East Asia.However, direct evidence regarding the functions of the stone knives has been scarce, and hence, their functions have remained controversial. In this study, we recovered and analysed ancient starch grains and phytoliths from residues adhering to stone knives excavated from the Lajia site, Qinghai Province, northwest China, thus providing direct evidence for the functions of the knives. Our analyses were based on the following:(1) an assemblage of 278identifiable starch grains, representing grains from the stems of foxtail millet(Setaria italica) and broomcorn millet(Panicum miliaceum)(65.1 % of the total) and the stems of Hordeum and Triticum species(3.6 % of the total), and(2) an assemblage of 361 identifiable phytoliths,the majority of which were from the stems and leaves of plants such as Panicoideae and related taxa(96 % of the total). Our study demonstrates that one of the functions of the stone knives was the harvesting crops. In addition, a few starch grains from food legumes and roots(3.4 % of the total) indicate that the stone knives were also likely used to process, peel and cut some foods. | Zhikun Ma Quan Li Xiujia Huan Xiaoyan Yang Jingyun Zheng Maolin Ye | 2014 | Chinese Science Bulletin2014，59，11： | 5 |
| 14 | LRP6 downregulation promotes cardiomyocyte proliferation and heart regeneration显示文摘The adult mammalian heart is thought to be a terminally differentiated organ given the postmitotic nature of cardiomyocytes.Consequently,the potential for cardiac repair through cardiomyocyte proliferation is extremely limited.Low-density lipoprotein receptor-related protein 6(LRP6)is a Wnt co-receptor that is required for embryonic heart development.In this study we investigated the role of LRP6 in heart repair through regulation of cardiomyocyte proliferation.Lrp6 deficiency increased cardiomyocyte cell cycle activity in neonatal,juvenile and adult mice.Cardiomyocyte-specific deletion of Lrp6 in the mouse heart induced a robust regenerative response after myocardial infarction(MI),led to reduced MI area and improvement in left ventricular systolic function.In vivo genetic lineage tracing revealed that the newly formed cardiomyocytes in Lrp6-deficient mouse hearts after MI were mainly derived from resident cardiomyocytes.Furthermore,we found that the pro-proliferative effect of Lrp6 deficiency was mediated by the ING5/P21 signaling pathway.Gene therapy using the adeno-associated virus(AAV)9 miRNAi-Lrp6 construct promoted the repair of heart injury in mice.Lrp6 deficiency also induced the proliferation of human induced pluripotent stem cell-derived cardiomyocytes(iPSC-CMs).Our study identifies LRP6 as a critical regulator of cardiomyocyte proliferation,which may lead to the development of a novel molecular strategy to promote myocardial regeneration and repair. | Yahan Wu Liping Zhou Hongyu Liu Ran Duan Huixing Zhou Fulei Zhang Xiaoyu He Dongbo Lu Ke Xiong Maolin Xiong Jinzhu Zhuang Yi Liu Li Li Dandan Liang Yi-Han Chen | 2021 | Cell Research2021，31，4： | 5 |
| 15 | Analytical and Experimental Study on Complex Compressed Air Pipe Network显示文摘To analyze the working characteristics of complex compressed air networks, numerical methods are widely used which are based on finite element technology or intelligent algorithms. However, the effectiveness of the numerical methods is limited. In this paper, to provide a new method to optimize the design and the air supply strategy of the complex compressed air pipe network, firstly, a novel method to analyze the topology structure of the compressed air flow in the pipe network is initially proposed. A matrix is used to describe the topology structure of the compressed air flow. Moreover, based on the analysis of the pressure loss of the pipe network, the relationship between the pressure and the flow of the compressed air is derived, and a prediction method of pressure fluctuation and air flow in a segment in a complex pipe network is proposed. Finally, to inspect the effectiveness of the method, an experiment with a complex network is designed. The pressure and the flow of airflow in the network are measured and studied. The results of the study show that, the predicted results with the proposed method have a good consistency with the experimental results, and that verifies the air flow prediction method of the complex pipe network. This research proposes a new method to analyze the compressed air network and a prediction method of pressure fluctuation and air flow in a segment, which can predicate the fluctuation of the pressure according to the flow of compressed air, and predicate the fluctuation of the flow according to the pressure in a segment of a complex pipe network. | GAI Yushou CAI Maolin SHI Yan | 2015 | Chinese Journal of Mechanical Engineering2015，28，5： | 4 |
| 16 | In vitro and in silico analysis of dual-function peptides derived from casein hydrolysate显示文摘There is no study on food-derived peptide with both anticoagulant and angiotensin I-converting enzyme inhibitory (ACEI) activities yet. In this work, the anticoagulant and ACEI activities of the casein hydrolysates released by pepsin digestion were evaluated for the first time to the best of our knowledge. Results indicated that the casein hydrolysate exhibited potent anticoagulant activity by prolonging the thrombin time (TT) and the activated partial thromboplastin time (APTT). Compared with control samples, at 10 mg/mL, the TT and APTT of casein hydrolysate were 186.0 % ± 6.6 % and 163.5 % ± 7.4 %, respectively. The casein hydrolysate also showed a strong ACEI activity with an IC50 value of 1.775 mg/mL. The components of the bioactive casein hydrolysate were analyzed by nanoscale liquid chromatography quadrupole time-of-flight tandem mass spectrometry (NanoLC-Q-TOF-MS/MS). Total of 115 peptides were identified, among which 34, 9, 55 and 17 peptides were derived from α_(s1-), α_(s2-), β-, and κ-casein, respectively. The results of PeptideRanker and PepSite 2 analysis showed that 6 peptides (FRQFYQL, NENLLRF, NPWDQVKR, PVVVPPFLQ, PVRGPFPIIV, and ARHPHPHLSF) have both ACEI and anticoagulant activities by binding to the active sites of ACE and thrombin. This study indicated that casein is a potential functional food supplement that can be used for medical purposes. | Maolin Tu Xinyu Qiao Cong Wang Hanxiong Liu Shuzhen Cheng Zhe Xu Ming Du | 2021 | Food Science and Human Wellness2021，10，1： | 4 |
| 17 | Retrospect and prospect of Geographical Sciences in China: A comparison with the Strategic Directions for Geography in the USA显示文摘理解变化行星:为地理科学(UCP ) 的战略方向,出版了由国家研究委员会(美国) ,和它在职业地理学者的评价建议那大写和复数地理科学(GS ) 是为在为我们的很快变化的行星的更好的理解的下一十年的地理的战略方向。根据这些评价, UCP 过分地珍视技术和工具(任务) ,并且没对方法论(纪律) 给予许多注意。实际上,任务和纪律是地理翅膀,特别在大科学的时间。从 UCP 和它的注释的启发是应该在任务和学科之间被平衡的战略方向, GS 应该是一个纪律系统,方法论,和技术和工具的三维的构造,并且这个系统应该是基于科学精神的科学人性并且由人性指导。在最后 60 年期间,中国地理学者把自己奉献给 GS,包括实践和理论。显然,进步和眼界作为学科交差的 GS,地球表面科学(S 字) 和地理建设(GC ) 被建议。GS 的纪律系统是很复杂的,并且由象科学,技术,工程,和哲学的如此的人的知识领域构成。主要使命是研究户外,建筑群,和宏地球系统(不仅科学地,而且人性地) ,并且一重要方法论是质、量的工具(CIQQM ) 的全面集成。同时,在中国地理的另一个变化方向是人经济的地理(HEG ) 。 | SUN Jun PAN Yujun TANG Maolin WU Youde | 2013 | Journal of Geographical Sciences2013，23，6： | 4 |
| 18 | Reverse Time Migration with Elastodynamic Gaussian Beams显示文摘Elastic migration has been widely paid attention by employing the vector processing of multicomponent seismic data.Ray based elastic Kirchhoff migration has such properties as high flexibility and high efficiency.However,it has failed to solve many problems caused by multipath.On the other hand,elastic reverse-time migration(RTM)based on the two-way wave equation is known to be capable of dealing with these problems,but it is extremely expensive when applied in 3D cases and velocity model building.Based on the elastic Kirchhoff-Helmholtz integral,we calculate decoupled backward-continued wavefields by introducing elastic Green functions for P-and S-waves,which is expressed by a summation of elastodynamic Gaussian beams.The PP and polarity-corrected PS images are obtained by calculating the correlation between downward and decoupled backward-continued vector wavefields,where polarity correction is performed by analyzing the relation between the polarization direction of converted PS waves and incident angle on the interface.To a large extent,our method combines the high efficiency of ray-based migration with the high accuracy of wave-equation based reverse-time migration.Application of this method to multicomponent synthetic datasets from the fault model and Marmousi 2 model demonstrates the validity,flexibility and accuracy of the new method. | Jianping Huang Maolin Yuan Qing Zhang Lingxiao Jia Zhenchun Li Jiguang Li Shengtian Zhao | 2017 | Journal of Earth Science2017，28，4： | 4 |
| 19 | Methods to Evaluate and Measure Power of Pneumatic System and Their Applications显示文摘Pneumatic system has been widely used throughout industry, and it consumes more than billions kW h of electricity one year all over the world. So as to improve the efficiency of pneumatic system, its power evaluation as well as measurement methods should be proposed, and their applicability should be validated. In this paper, firstly, power evaluation and measurement methods of pneumatic system were introduced for the first time. Secondly, based on the proposed methods, power distributions in pneumatic system was analyzed. Thirdly, through the analysis on pneumatic efficiencies of typical compressors and pneumatic components, the applicability of the proposed methods were validated. It can be concluded that, first of all, the proposed methods to evaluation and measurement the power of pneumatic system were efficient. Furthermore, the pneumatic power efficiencies of pneumatic system in the air production and cleaning procedure are respectively about 35%–75% and 85%–90%. Moreover, the pneumatic power efficiencies of pneumatic system in the transmission and consumption procedures are about 70%–85% and 10%–35%. And the total pneumatic power efficiency of pneumatic system is about 2%–20%, which varies largely with the system configuration. This paper provides a method to analyze and measure the power of pneumatic system, lay a foundation for the optimization and energy-saving design of pneumatic system. | Yan Shi Maolin Cai Weiqing Xu Yixuan Wang | 2019 | Chinese Journal of Mechanical Engineering2019，32，3： | 4 |
| 20 | An aviation oxygen supply system based on a mechanical ventilation model显示文摘At high altitudes, an Aviation Oxygen Supply System(AOSS) protects pilots from low pressure and hypoxia by continuously providing oxygen corresponding to the pilots' dynamic respiratory properties.An AOSS mainly consists of oxygen supercharging machines which are used in a high-altitude flight cabin to supply pressurized oxygen to pilots.Therefore, it is of great significance to study the airflow dynamic characteristics of an AOSS for safe, continuous, and efficient oxygen supply.In this paper, an AOSS is firstly simplified and considered as a mechanical ventilation system.Then, its corresponding mathematical model is constructed.Next, to verify the mathematical model, a prototype AOSS with a lung simulator is proposed for an experimental study.Afterwards, to build a foundation for the optimization of the AOSS, the airflow dynamic characteristics of an aircraft are analyzed, and the effects of key parameters on the respiration system are researched.Through experimental and simulation studies, it can be concluded that the mathematical model is effective.Subsequently, for stability during the respiration process, we consider setting the equivalent throttling areas of the inspiration and expiration pipelines smaller within certain limits; additionally, an excessively high oxygen supply pressure will disturb smooth airflow, and in a low-pressure environment, the pressure can be 84 cm H_2O lower than the standard atmospheric pressure.This research can be referred to in the design of an oxygen supply system and the study on optimization of airflow dynamic characteristics. | Yan SHI Yixuan WANG Maolin CAI Bolun ZHANG Jian ZHU | 2018 | Chinese Journal of Aeronautics2018，31，1： | 4 |
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