When helicopter is climbing from the ground or flying close to a solid surface,the flow around the lifting rotor can be strongly affected such that it will become time varying.To control the helicopter when the ground...When helicopter is climbing from the ground or flying close to a solid surface,the flow around the lifting rotor can be strongly affected such that it will become time varying.To control the helicopter when the ground effect presents,a fast and accurate simulation technique is required.Traditional finite state inflow model with ground effect still need numerical integration since it cannot directly give prediction below the disk,and the computation of wake is necessary due to its interaction with ground.To improve the efficiency of the model,the adjoint theorem is adopted such that the wake can be solved with closed form equations.The result in hover condition is validated with Hayden model which is correlated well with the experimental data.展开更多
Infrared and visible light image fusion technology is a hot spot in the research of multi-sensor fusion technology in recent years. Existing infrared and visible light fusion technologies need to register before fusio...Infrared and visible light image fusion technology is a hot spot in the research of multi-sensor fusion technology in recent years. Existing infrared and visible light fusion technologies need to register before fusion because of using two cameras. However, the application effect of the registration technology has yet to be improved. Hence, a novel integrative multi-spectral sensor device is proposed for infrared and visible light fusion, and by using the beam splitter prism, the coaxial light incident from the same lens is projected to the infrared charge coupled device （CCD） and visible light CCD, respectively. In this paper, the imaging mechanism of the proposed sensor device is studied with the process of the signals acquisition and fusion. The simulation experiment, which involves the entire process of the optic system, signal acquisition, and signal fusion, is constructed based on imaging effect model. Additionally, the quality evaluation index is adopted to analyze the simulation result. The experimental results demonstrate that the proposed sensor device is effective and feasible.展开更多
文摘When helicopter is climbing from the ground or flying close to a solid surface,the flow around the lifting rotor can be strongly affected such that it will become time varying.To control the helicopter when the ground effect presents,a fast and accurate simulation technique is required.Traditional finite state inflow model with ground effect still need numerical integration since it cannot directly give prediction below the disk,and the computation of wake is necessary due to its interaction with ground.To improve the efficiency of the model,the adjoint theorem is adopted such that the wake can be solved with closed form equations.The result in hover condition is validated with Hayden model which is correlated well with the experimental data.
基金This study is supported by the Natural Science Foundation of China （Grant No. 51274150） and Shanxi Province Natural Science Foundation of China （Grant No. 201601 D011059）.
文摘Infrared and visible light image fusion technology is a hot spot in the research of multi-sensor fusion technology in recent years. Existing infrared and visible light fusion technologies need to register before fusion because of using two cameras. However, the application effect of the registration technology has yet to be improved. Hence, a novel integrative multi-spectral sensor device is proposed for infrared and visible light fusion, and by using the beam splitter prism, the coaxial light incident from the same lens is projected to the infrared charge coupled device （CCD） and visible light CCD, respectively. In this paper, the imaging mechanism of the proposed sensor device is studied with the process of the signals acquisition and fusion. The simulation experiment, which involves the entire process of the optic system, signal acquisition, and signal fusion, is constructed based on imaging effect model. Additionally, the quality evaluation index is adopted to analyze the simulation result. The experimental results demonstrate that the proposed sensor device is effective and feasible.
