Ye H.,Hefei University of Technology |
Yuan Z.,Hefei University of Technology |
Zhang S.,The First Engineers Scientific Research Institute
Journal of Bionic Engineering | Year: 2013
Understanding the heat and mass transfer processes of plant leaves is essential for plant bionic engineering. A general thermophysical model was established for a plant leaf with particular emphasis on the transpiration process. The model was verified by the field measured stomatal resistance and temperature of a camphor leaf. A dynamical simulation revealed that diurnal transpiration water consumption is dominated by the solar irradiance and the day-average temperature of the leaf is dominated by the ambient air temperature; transpiration plays an important role in the cooling of the leaf, in average it could dissipate around 32.9% of the total solar energy absorbed by the leaf in summer. To imitate the thermal infared characteristic of the real leaf, the up surface of the bionic leaf must have emissivity and solar absorptivity close to those of a real leaf and its shape and surface roughness must be similar to those of the real leaf. The key point is that the bionic leaf must be able to evaporate water to simulate the transpiration of a plant leaf, appropriate adsorbent can be used to realize this function. © 2013 Jilin University.
Lu Y.-L.,The First Engineers Scientific Research Institute |
Mu J.-Y.,The First Engineers Scientific Research Institute
Binggong Xuebao/Acta Armamentarii | Year: 2015
In order to research the relationship between the physical values of coating aging in the natural environment and the environmental factors, a genetic BP neural network with real coding, arithmetic crossover, Gauss mutation and climbing operation is designed. The physical values of coating are calculated according to the environmental factors. Visual Studio 2008 is used for programming, and a program is developed for neural network training and prediction program. Finally, an example of field aging data of coating is used for network training and prediction. The results show that the proposed model can be used to calculate the ultimate life of the coating. The calculated values are similar to the measured values. The genetic neural network model can be used for prediction of coating life. © 2015, China Ordnance Society. All right reserved.
Cai Y.-X.,The First Engineers Scientific Research Institute |
Xue S.-Q.,The First Engineers Scientific Research Institute |
Zhou Z.-Y.,The First Engineers Scientific Research Institute |
Huang Y.,Unit 77208 of PLA
Binggong Xuebao/Acta Armamentarii | Year: 2016
Painting camouflage is an important camouflage technique. Digital camouflage is an effective means against high-resolution imaging reconnaissance. How to achieve the effectiveness, precision and intelligence of camouflage design technology is always a reseach focus. The texture features of background image are extracted based on FBM fractal dimension estimation method, and the dominant color features of background image are extracted based on pyramid structure fuzzy C-means cluster (FCM) clustering algorithm. The digital camouflage patterns conforming to the characteristics of background are generated based on the improved diamond-square algorithm. The simulation results show that the proposed algorithm is used to achieve the preferable results of pattern generation in desert, jungle, forest land backgrounds. © 2016, China Ordnance Society. All right reserved.
Han J.,The First Engineers Scientific Research Institute |
Chen G.,The First Engineers Scientific Research Institute |
Li W.,The First Engineers Scientific Research Institute |
Jin H.,Nanjing University of Aeronautics and Astronautics |
Zhao C.,The First Engineers Scientific Research Institute
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012
An oscillating combined steering mechanism was introduced. With Denavit-Hatenberg homogeneous transformed matrix, the kinematics model of the steering mechanism was constructed. The multi-objective optimization method for designing the location of key hinge was proposed. The engineering illustration of steering mechanism was calculated, and the result was proved by the ADAMS software. Some characteristics of steering mechanism, such as the asymmetry of steering drive oil cylinder control, steering smoothness, skidding behavior, and symmetrical distribution were analyzed. The proposed method was reliable and simple, and had important practical value for engineering applications. The steering mechanism had some merits, such as small turn radius, little side slide, easily controllable, it will have wide applied range in engineering vehicle.
Zhu Y.-C.,PLA University of Science and Technology |
Zhu Y.-C.,The First Engineers Scientific Research Institute |
Gao C.,PLA University of Science and Technology |
Li Y.-X.,PLA University of Science and Technology |
Chen Y.-G.,Jiangsu Yongfeng Mechanic Ltd.
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2010
A small-size acceleration measurement system based on ARM system was designed by using acceleration chip Model 1221 and expanding the external memory. Combined with the communication port, the application software was developed to display, store and deal with the data measured. By measuring the centripetal acceleration of the rotating body at the uniform velocity, this system was calibrated. The blast acceleration produced by shaking table was surveyed, and then the data were compared. The results show that the size of this system is smaller, the intelligent extent is higher, the dynamic range is greater and the memory capacity is larger.