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一种基于Aviator的公式定义及校验方法
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作者 李苏 《金融科技时代》 2017年第4期48-50,共3页
在涉及数据采集、统计、分析的信息系统中,常常用到公式校验功能,来验证某些数据是否满足一定的公式条件,判定这些数据是否正确或合法。本文提出一种定义公式的数据模型,同时基于开源的Aviator,从公式校验步骤、公式子项求值两方面实现... 在涉及数据采集、统计、分析的信息系统中,常常用到公式校验功能,来验证某些数据是否满足一定的公式条件,判定这些数据是否正确或合法。本文提出一种定义公式的数据模型,同时基于开源的Aviator,从公式校验步骤、公式子项求值两方面实现了公式的合法性及有效性校验,并在项目应用中实践成功。 展开更多
关键词 aviator 公式定义 公式校验
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2003款林肯Aviator
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《世界汽车》 2003年第2期31-32,共2页
全新的2003款林肯Aviator是林肯品牌里的第一款中级尺寸的SUV,其特点是独特的设计和运动性能。林肯Aviator拥有更灵活多变的座椅配置方案,更大空间的座舱以及同级主中更突出的驱动能力,它欲在竞争日益激烈的中级SUV市场内分得一杯羹。
关键词 2003款林肯aviator汽车 SUV 运动型车 汽车设计 结构配置 技术性能
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涅槃重生的豪华SUV 林肯Aviator飞行员
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作者 林含雨 《中国汽车市场》 2018年第9期24-27,共4页
“飞行姿态”设计哲学 林肯Aviator采用最新的林肯家族设计语言,它的设计哲学成型于其命名,“飞行器所独有的流线型设计被用以打造全新林肯Aviator的外部线条.”林肯设计总监大卫 伍德豪斯表示.大尺寸进气格栅一眼望去和领航员有好几... “飞行姿态”设计哲学 林肯Aviator采用最新的林肯家族设计语言,它的设计哲学成型于其命名,“飞行器所独有的流线型设计被用以打造全新林肯Aviator的外部线条.”林肯设计总监大卫 伍德豪斯表示.大尺寸进气格栅一眼望去和领航员有好几分相似,采用了全新航空学设计语言,更加符合它的名字“飞行员”的形象,与林肯LOGO相同形状的镂空设计也体现出了对于新车在细节上的极致追求.前大灯的造型棱角分明,内部两条LED日间行车灯设计也让其更具豪华感. 展开更多
关键词 SUV aviator 飞行员 伍德豪斯
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全新林肯飞行家Aviator
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《汽车观察》 2019年第4期31-31,共1页
大型豪华SUV全新林肯飞行家Aviator于上海车展中国首秀。作为林肯SUV家族最新成员,全新林肯飞行家Aviator诠释林肯最新品牌理念'静谧之旅',将优雅设计及澎湃性能提升至新高度。它也是林肯品牌首个提供插电式混合动力选择的车型。
关键词 aviator
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Explosion damage effects of aviation kerosene storage tank under strong ignition
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作者 Shixiang Song Cheng Wang +1 位作者 Boyang Qiao Gongtian Gu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第7期27-38,共12页
In order to study the blast damage effects of aviation kerosene storage tanks,the out-field explosion experiments of 8 m3fixed-roof tanks were carried out.The fragments,shock wave and fireball thermal radiation of the... In order to study the blast damage effects of aviation kerosene storage tanks,the out-field explosion experiments of 8 m3fixed-roof tanks were carried out.The fragments,shock wave and fireball thermal radiation of the tank in the presence of bottom oil,half oil and full oil,as well as empty tank,were investigated under internal explosion by various TNT charge contents(1.8 kg,3.5 kg and 6.2 kg).The results showed that the tank roof was the only fragment produced,and the damage forms could be divided into three types.The increase of TNT charge content and oil volume enlarged the deformation of the tank,while the hole ratio presented a trend of increase first and then decrease.The H_r,maxand V_(max)values positively increased as increasing the TNT charge content and oil volume(from empty to half oil),but decreased in full oil.The Pmaxvalues had a progressive increase with the increment of TNT charge content,but not the case with the increase in oil volumes.The development of fireball was divided into three stages:tank roof‘towed'flame,jet flow flame tumbling and rising,and jet flow flame extinguishing.The Dmaxand Hf,maxvalues both increased as increasing TNT charge content and oil volumes.The oscillation phenomenon of fireball temperature was observed in the cooling process.The average temperature of fireball surface was positively correlated with TNT charge content,and negatively correlated with oil volumes. 展开更多
关键词 Aviation kerosene Storage tank Internal explosion Shock wave FIREBALL
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Transactions of Nanjing University of Aeronautics and Astronautics Information for Contributors
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《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第1期F0003-F0003,共1页
Transactions of Nanjing University of Aeronautics&Astronautics (TNUAA) is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific i... Transactions of Nanjing University of Aeronautics&Astronautics (TNUAA) is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific insights,TNUAA publishes experimental and theoretical papers bearing on applications to all branches of aeronautics, astronautics and civil aviation. 展开更多
关键词 PROMPT AVIATION journal
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Transactions of Nanjing University of Aeronautics and Astronautics Information for Contributors
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《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第2期F0003-F0003,共1页
Transactions of Nanjing University of Aeronautics&Astronautics (TNUAA) is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific i... Transactions of Nanjing University of Aeronautics&Astronautics (TNUAA) is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific insights,TNUAA publishes experimental and theoretical papers bearing on applications to all branches of aeronautics, astronautics and civil aviation. 展开更多
关键词 PROMPT AVIATION NANJING
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Transactions of Nanjing University of Aeronautics and Astronautics Information for Contributors
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《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第3期F0003-F0003,共1页
Transactions of Nanjing University of Aeronautics&Astronautics (TNUAA) is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific i... Transactions of Nanjing University of Aeronautics&Astronautics (TNUAA) is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific insights,TNUAA publishes experimental and theoretical papers bearing on applications to all branches of aeronautics, astronautics and civil aviation. 展开更多
关键词 PROMPT AVIATION journal
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Transactions of Nanjing University of Aeronautics and Astronautics Information for Contributors
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《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第4期F0003-F0003,共1页
Transactions of Nanjing University of Aeronautics&Astronautics(TNUAA)is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific ins... Transactions of Nanjing University of Aeronautics&Astronautics(TNUAA)is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific insights,TNUAA publishes experimental and theoretical papers bearing on applications to all branches of aeronautics,astronautics and civil aviation. 展开更多
关键词 PROMPT AVIATION journal
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An Efficient Reliability-Based Optimization Method Utilizing High-Dimensional Model Representation and Weight-Point Estimation Method
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作者 Xiaoyi Wang Xinyue Chang +2 位作者 Wenxuan Wang Zijie Qiao Feng Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第5期1775-1796,共22页
The objective of reliability-based design optimization(RBDO)is to minimize the optimization objective while satisfying the corresponding reliability requirements.However,the nested loop characteristic reduces the effi... The objective of reliability-based design optimization(RBDO)is to minimize the optimization objective while satisfying the corresponding reliability requirements.However,the nested loop characteristic reduces the efficiency of RBDO algorithm,which hinders their application to high-dimensional engineering problems.To address these issues,this paper proposes an efficient decoupled RBDO method combining high dimensional model representation(HDMR)and the weight-point estimation method(WPEM).First,we decouple the RBDO model using HDMR and WPEM.Second,Lagrange interpolation is used to approximate a univariate function.Finally,based on the results of the first two steps,the original nested loop reliability optimization model is completely transformed into a deterministic design optimization model that can be solved by a series of mature constrained optimization methods without any additional calculations.Two numerical examples of a planar 10-bar structure and an aviation hydraulic piping system with 28 design variables are analyzed to illustrate the performance and practicability of the proposed method. 展开更多
关键词 Reliability-based design optimization high-dimensional model decomposition point estimation method Lagrange interpolation aviation hydraulic piping system
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Transactions of Nanjing University of Aeronautics and Astronautics Information for Contributors
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《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第S01期F0003-F0003,共1页
Transactions of Nanjing University of Aeronautics&Astronautics(TNUAA)is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific ins... Transactions of Nanjing University of Aeronautics&Astronautics(TNUAA)is a bimonthly journal facing international academic community.Emphasizing prompt and effective dissemination of key data and new scientific insights,TNUAA publishes experimental and theoretical papers bearing on applications to all branches of aeronau-tics,astronautics and civil aviation. 展开更多
关键词 PROMPT AVIATION journal
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Effect of Nozzle Inclination Angle on Fuel-Air Mixing and Combustion in a Heavy Fuel Engine
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作者 Zhigang Wang Bin Zheng +4 位作者 Peidong Zhao Baoli Wang Fanyan Meng Wenke Xu Jian Meng 《Fluid Dynamics & Materials Processing》 EI 2024年第2期365-382,共18页
Heavy-fuel engines are widely used in UAVs(Unmanned Autonomous Vehicles)because of their reliability and high-power density.In this study,a combustion model for an in-cylinder direct injection engine has been imple-me... Heavy-fuel engines are widely used in UAVs(Unmanned Autonomous Vehicles)because of their reliability and high-power density.In this study,a combustion model for an in-cylinder direct injection engine has been imple-mented using the AVL FIRE software.The effects of the angle of nozzle inclination on fuel evaporation,mixture distribution,and combustion in the engine cylinder have been systematically studied at 5500 r/min and consider-ing full load cruise conditions.According to the results,as the angle of nozzle inclination increases,the maximum combustion explosion pressure in the cylinderfirst increases and then it decreases.When the angle of nozzle incli-nation is less than 45°,the quality of the mixture in the cylinder and the combustion performance can be improved by increasing the angle.When the angle of nozzle inclination is greater than 45°,however,the mixture unevenness increases slightly with the angle,leading to a deterioration of the combustion performances.When the angle of nozzle inclination is between 35°and 55°,the overall combustion performance of the engine is rela-tively good.When the angle of nozzle inclination is 45°,the combustion chamber’s geometry and the cylinder’s airflow are well matched with the fuel spray,and the mixture quality is the best.Compared with 25°,the peak heat release rate increases by 20%,and the maximum combustion burst pressure increases by 5.5%. 展开更多
关键词 Aviation heavy fuel piston engine nozzle inclination angle COMBUSTION fuel-air mixing
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Classification of aviation incident causes using LGBM with improved cross-validation
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作者 NI Xiaomei WANG Huawei +1 位作者 CHEN Lingzi LIN Ruiguan 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2024年第2期396-405,共10页
Aviation accidents are currently one of the leading causes of significant injuries and deaths worldwide. This entices researchers to investigate aircraft safety using data analysis approaches based on an advanced mach... Aviation accidents are currently one of the leading causes of significant injuries and deaths worldwide. This entices researchers to investigate aircraft safety using data analysis approaches based on an advanced machine learning algorithm.To assess aviation safety and identify the causes of incidents, a classification model with light gradient boosting machine (LGBM)based on the aviation safety reporting system (ASRS) has been developed. It is improved by k-fold cross-validation with hybrid sampling model (HSCV), which may boost classification performance and maintain data balance. The results show that employing the LGBM-HSCV model can significantly improve accuracy while alleviating data imbalance. Vertical comparison with other cross-validation (CV) methods and lateral comparison with different fold times comprise the comparative approach. Aside from the comparison, two further CV approaches based on the improved method in this study are discussed:one with a different sampling and folding order, and the other with more CV. According to the assessment indices with different methods, the LGBMHSCV model proposed here is effective at detecting incident causes. The improved model for imbalanced data categorization proposed may serve as a point of reference for similar data processing, and the model’s accurate identification of civil aviation incident causes can assist to improve civil aviation safety. 展开更多
关键词 aviation safety imbalance data light gradient boosting machine(LGBM) cross-validation(CV)
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Novel Method for Evaluating the Aging of Aviation Turbine Engine Oils via High-Temperature Bearing Deposit Tests
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作者 Hao Lichun Yang He +3 位作者 Song Haiqing Zhou Yunfan He Jingjian Liang Yuxiang 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第1期67-77,共11页
Aviation turbine engine oils require excellent thermal-oxidative stability because of their high-temperature environments.High-temperature bearing deposit testing is a mandatory method for measuring the thermal-oxidat... Aviation turbine engine oils require excellent thermal-oxidative stability because of their high-temperature environments.High-temperature bearing deposit testing is a mandatory method for measuring the thermal-oxidative performance of aviation lubricant oils,and the relevant apparatus was improved in the present study.Two different commercial aviation turbine engine oils were tested,one with standard performance(known as the SL oil)and the other with high thermal stability,and their thermal-oxidative stability characteristics were evaluated.After 100 h of high-temperature bearing testing,the SL oil was analyzed by using various analytical techniques to investigate its thermal-oxidative process in the bearing test,with its thermal-oxidative degradation mechanism also being discussed.The results indicate that the developed high-temperature bearing apparatus easily meets the test requirements of method 3410.1 in standard FED-STD-791D.The viscosity and total acid number(TAN)of the SL oil increased with the bearing test time,and various deposits were produced in the bearing test,with the micro-particles of the carbon deposits being sphere-like,rod-like,and sheet-like in appearance.The antioxidant additives in the oil were consumed very rapidly in the first 30 h of the bearing test,with N-phenyl-1-naphthylamine being consumed faster than dioctyldiphenylamine.Overall,the oil thermal-oxidative process involves very complex physical and chemical mechanisms. 展开更多
关键词 aviation turbine engine oil high-temperature bearing deposit test thermal-oxidative degradation antioxidant additives
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A survey of composite robot for aviation intelligent manufacturing application
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作者 陶永 XUE Jiao +3 位作者 WEI Hongxing LIU Haitao GAO He WANG Tianmiao 《High Technology Letters》 EI CAS 2024年第1期85-98,共14页
With the rapid development of the aviation industry,the development of intelligent manufacturing equipment represented by composite robots has been paid close attention by the aviation industry.Based on the analysis o... With the rapid development of the aviation industry,the development of intelligent manufacturing equipment represented by composite robots has been paid close attention by the aviation industry.Based on the analysis of the background and main structure function of composite robots,this paper focuses on the analysis of key technologies such as composite robot hardware design,visual sensing and planning system,integrated control of‘hands,feet,and eyes',multi-robot collaborative operation,and safety.The typical applications of composite robots in aviation intelligent manufacturing such as automatic drilling and connection of aircraft,aircraft surface spraying and finishing,parts handling,aircraft measurement,and inspection are presented.The development trends such as standardization of composite robots,integration of‘5G+cloud computing+AI',and fusion of intelligent sensors are proposed. 展开更多
关键词 aviation manufacturing composite robot key technology development trend safety
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Impact of a 12-wk physical conditioning program on the aerobic capacity of aviation cadets
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作者 Hao Luo Ding-Yu Zhao Juan Li 《World Journal of Clinical Cases》 SCIE 2024年第20期4239-4246,共8页
BACKGROUND Flight cadets need to have good physical fitness to cope with the challenges of flying missions.The continuous development of science and technology has led to the constant upgrading of fighter jets and the... BACKGROUND Flight cadets need to have good physical fitness to cope with the challenges of flying missions.The continuous development of science and technology has led to the constant upgrading of fighter jets and the improvement of their performance,which has resulted in new and higher requirements for the physical fitness of flight personnel.The traditional physical training mode,method,and assessment have been used for many years and do not meet current fitness needs.AIM To investigate the impact of a 12-wk comprehensive anti-G fitness training program on the aerobic capacity of aviation cadets and to evaluate its effectiveness.METHODS Fifty-five cadets were randomly assigned to control and experimental groups using a randomized,single-blind design.The control group maintained their existing training regimen,while the experimental group participated in a 12-wk comprehensive training intervention.The training program comprised strength training twice per week,high-intensity interval training three times per week,and supplemental nutritional and psychological support.Maximal oxygen uptake(VO2max),lower limb strength,and hemoglobin levels were measured at baseline,at 6 wk and 12 wk post-intervention.RESULTS Repeated measures analysis of variance revealed significant differences of both VO2max and relative VO2 in both groups across time points(P<0.05).However,no significant time-group interaction was observed(P>0.05).Paired t-tests comparing baseline and 12-wk results showed that VO2max and relative VO2 were significantly higher in the experimental group than the control group(P<0.05).This suggests that the training program effectively enhanced the aerobic capacity of the experimental group.Key indicators of aerobic capacity,bilateral lower limb strength and hemoglobin levels,were also significantly different over time and between groups(P<0.05).No significant differences were noted in heart-rate metrics(P>0.05).CONCLUSION A 12-wk comprehensive anti-G fitness training program significantly improved the aerobic capacity of aviation cadets,thereby enhancing their overall capacity and laying a physiological foundation for enduring high-G flights. 展开更多
关键词 Aviation cadets Aerobic capacity Physical training High-intensity interval training Anti-G fitness
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The Relation between Mental Workload and Face Temperature in Flight Simulation
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作者 Amin Bonyad Hamdi Ben Abdessalem Claude Frasson 《Journal of Behavioral and Brain Science》 2024年第2期64-92,共29页
In this research, we study the relationship between mental workload and facial temperature of aircraft participants during a simulated takeoff flight. We conducted experiments to comprehend the correlation between wor... In this research, we study the relationship between mental workload and facial temperature of aircraft participants during a simulated takeoff flight. We conducted experiments to comprehend the correlation between work and facial temperature within the flight simulator. The experiment involved a group of 10 participants who played the role of pilots in a simulated A-320 flight. Six different flying scenarios were designed to simulate normal and emergency situations on airplane takeoff that would occur in different levels of mental workload for the participants. The measurements were workload assessment, face temperatures, and heart rate monitoring. Throughout the experiments, we collected a total of 120 instances of takeoffs, together with over 10 hours of time-series data including heart rate, workload, and face thermal images and temperatures. Comparative analysis of EEG data and thermal image types, revealed intriguing findings. The results indicate a notable inverse relationship between workload and facial muscle temperatures, as well as facial landmark points. The results of this study contribute to a deeper understanding of the physiological effects of workload, as well as practical implications for aviation safety and performance. 展开更多
关键词 Mental Workload EEG Thermal Images Flight Simulation AVIATION Face Temperature
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Long-term Development Prospects and Suggestions for Domestic Refined Oil Market
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作者 Kong Jingyuan Qin Biao Li Mingjiang 《China Oil & Gas》 CAS 2024年第4期30-39,共10页
Over the past decade,China’s refined oil market has experienced considerable growth and fluctuations.Gasoline consumption has generally followed the growth rate of vehicle equipment,with fluctuations influenced by tr... Over the past decade,China’s refined oil market has experienced considerable growth and fluctuations.Gasoline consumption has generally followed the growth rate of vehicle equipment,with fluctuations influenced by travel frequency;aviation fuel consumption has seen stable growth following the end of COVID-19,while diesel consumption has been affected by multiple factors including demand and policy.With the rapid development of new energy vehicles and alternative fuels,the gasoline and diesel market has essentially peaked,yet domestic production of refined oil continues to grow,leading to an increasingly prominent oversupply issue.To achieve the dual carbon goals,the Chinese government has introduced a series of policies that have a profound impact on the refined oil market.Facing resource surplus and market demand changes,the refining industry needs to optimize production capacity structure,and oil products retail companies face transformation pressure.The article aims to provide market analysis and recommendations,serving as a reference for relevant enterprises and policymakers. 展开更多
关键词 COMPANIES refined AVIATION
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A New Future-Oriented Model
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作者 GAO YUANYANG 《China Today》 2024年第11期24-26,共3页
In low altitude,an incredible airspace industry is taking shape.AS an economic concept,the low-altitude economy aims to utilize the unique resources of low-altitude airspace in a bid to develop general aviation or civ... In low altitude,an incredible airspace industry is taking shape.AS an economic concept,the low-altitude economy aims to utilize the unique resources of low-altitude airspace in a bid to develop general aviation or civilian non-airline flight,and energize the related industries from the sky to the ground. 展开更多
关键词 ALTITUDE utilize AVIATION
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Hazardous Attitude Factors Influence Risk Perception in General Aviation Pilots
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作者 Athina Holmes 《Advances in Aerospace Science and Technology》 2024年第3期85-93,共9页
This manuscript presents a research proposal to investigate how hazardous attitudes among general aviation pilots influence pilot performance in aviation accidents. General aviation pilots train to maintain safe flyin... This manuscript presents a research proposal to investigate how hazardous attitudes among general aviation pilots influence pilot performance in aviation accidents. General aviation pilots train to maintain safe flying conditions, but accidents still occur, and human factors figure prominently among the causes of aviation accidents. The levels of hazardous attitudes among pilots may influence the likelihood of engaging in risky flight behaviors that can lead to accidents. This quantitative study aims to determine whether dangerous attitudes impact risk perception in general aviation pilots. The study will focus on two specific hazardous attitudes, “Anti-Authority” and Macho” behaviors. Among the hazardous attitudes identified by the Federal Aviation Administration (FAA), the two attitudes often stand out in accident investigations and pilot narratives. While all hazardous attitudes have inherent dangers, these two attitudes tend to be more frequently cited in accident reports and investigations. Despite rigorous training in safe flying conditions, general aviation accidents still transpire due to human factors. This research hypothesizes that the five attitudes from the hazardous attitude model, particularly Anti-Authority and Macho, significantly shape pilots’ risk perception. The insights from this study would benefit stakeholders, like the Aircraft Owners and Pilots Association (AOPA), Air Safety Institute, and aviation training programs, in creating training modules tailored to reduce such attitudes. 展开更多
关键词 General Aviation (GA) PILOT Aviation Safety Hazardous Attitudes Anti-Authority Macho Risk Perception Flight Training
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