Micro-behavior of pilots is one of the most remarkable aspects in flight safety research domain.The study of pilot’s micro-behavior and its function are of great significance to enhance active safety warnings of flig...Micro-behavior of pilots is one of the most remarkable aspects in flight safety research domain.The study of pilot’s micro-behavior and its function are of great significance to enhance active safety warnings of flight and evaluation of flight cadets.Based on the cognitive process of pilots,this paper explores the meanings and contents of previous research on the pilot’s micro-behavior.The history and research status of pilot’s micro-behavior are briefly introduced from the perspective of their psychology,physiology and physics.The current reviews mainly include the pilot’s characteristic,multi-information fusion,integrated cognitive and humanization about controlling environment,etc.The several methods of these studies are discussed,and the mechanisms,experimental contents and applicable conditions of pilot’s physiological,psychological and physical characteristics are analyzed.Meanwhile,the advantages and shortcomings of the existing research results are pointed out and analyzed.Combined with flight simulation experiment,the internal mechanism of pilot is explained.Furthermore,with the latest research in the modern flight field,and also from the specialization of application,the diversification of methodologies and the depth of investigation are provided,as well as the development trend of pilot’s micro-behavior analysis in the future.展开更多
Advanced microfluidic technology was used to examine the microscopic viscous and inertial effects evolution of water flow in rock joints. The influence of void space on fluid flow behaviour in rock joints under differ...Advanced microfluidic technology was used to examine the microscopic viscous and inertial effects evolution of water flow in rock joints. The influence of void space on fluid flow behaviour in rock joints under different flow velocities was experimentally investigated at the micro scale. Using advanced fabrication technology of microfluidic device, micro flow channels of semicircular, triangular, rectangular and pentagonal cavities were fabricated to simulate different void space of rock joints, respectively. Using the fluorescence labelling approach, the trajectory of water flow was captured by the microscope digital camera when it passed over the cavity under different flow velocities. The flow tests show that the flow trajectory deviated towards the inside of the cavity at low flow velocities. With the increase in flow velocity, this degree of flow trajectory deviation decreased until there was no trajectory deviation for flow in the straight parallel channel. The flow trajectory deviation initially reduced from the void corner near the entrance. At the same time, a small eddy appeared near the void corner of the entrance. The size and intensity of the eddy increased with the flow velocity until it occupied the whole cavity domain. The gradual reduction of flow trajectory near the straight parallel channel and the growth of eddy inside the cavity reflect the evolution of microscopic viscous and inertial forces under different flow velocities.The eddy formed inside the cavity does not contribute to the total flow flux, but the running of the eddy consumes flow energy. This amount of pressure loss due to voids could contribute to the nonlinear deviation of fracture fluid flow from Darcy's law. This study contributes to the fundamental understanding of non-Darcy's flow occurrence in rock joints at the micro scale.展开更多
基金supported by the Funding for Outstanding Doctoral Dissertation in NUAA (No. BCXJ19-10)Postgraduate Research and Practice Innovation Program of Jiangsu Province(No. KYCX19_0196)Nanjing University of Aeronautics and Astronautics PhD short-term visiting scholar project(No. 190637DF07).
文摘Micro-behavior of pilots is one of the most remarkable aspects in flight safety research domain.The study of pilot’s micro-behavior and its function are of great significance to enhance active safety warnings of flight and evaluation of flight cadets.Based on the cognitive process of pilots,this paper explores the meanings and contents of previous research on the pilot’s micro-behavior.The history and research status of pilot’s micro-behavior are briefly introduced from the perspective of their psychology,physiology and physics.The current reviews mainly include the pilot’s characteristic,multi-information fusion,integrated cognitive and humanization about controlling environment,etc.The several methods of these studies are discussed,and the mechanisms,experimental contents and applicable conditions of pilot’s physiological,psychological and physical characteristics are analyzed.Meanwhile,the advantages and shortcomings of the existing research results are pointed out and analyzed.Combined with flight simulation experiment,the internal mechanism of pilot is explained.Furthermore,with the latest research in the modern flight field,and also from the specialization of application,the diversification of methodologies and the depth of investigation are provided,as well as the development trend of pilot’s micro-behavior analysis in the future.
基金support from the Australian Research Council-linkage Project
文摘Advanced microfluidic technology was used to examine the microscopic viscous and inertial effects evolution of water flow in rock joints. The influence of void space on fluid flow behaviour in rock joints under different flow velocities was experimentally investigated at the micro scale. Using advanced fabrication technology of microfluidic device, micro flow channels of semicircular, triangular, rectangular and pentagonal cavities were fabricated to simulate different void space of rock joints, respectively. Using the fluorescence labelling approach, the trajectory of water flow was captured by the microscope digital camera when it passed over the cavity under different flow velocities. The flow tests show that the flow trajectory deviated towards the inside of the cavity at low flow velocities. With the increase in flow velocity, this degree of flow trajectory deviation decreased until there was no trajectory deviation for flow in the straight parallel channel. The flow trajectory deviation initially reduced from the void corner near the entrance. At the same time, a small eddy appeared near the void corner of the entrance. The size and intensity of the eddy increased with the flow velocity until it occupied the whole cavity domain. The gradual reduction of flow trajectory near the straight parallel channel and the growth of eddy inside the cavity reflect the evolution of microscopic viscous and inertial forces under different flow velocities.The eddy formed inside the cavity does not contribute to the total flow flux, but the running of the eddy consumes flow energy. This amount of pressure loss due to voids could contribute to the nonlinear deviation of fracture fluid flow from Darcy's law. This study contributes to the fundamental understanding of non-Darcy's flow occurrence in rock joints at the micro scale.
