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and park characteristics such as park area, landscape shape index (LSI), green ratio and altitude were analyzed, using 3 010 temperature and humidity data from measurements in six parks with typical... of the PCI intensity. 2) Multivariate regression utilizing stepwise method was conducted to evaluate the roles of characteristics of parks (LSI, green ratio, area, altitude) affecting PCI intensity. 3......
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predicted. The results show that lowering the altitude of inlet air and reducing the effect of ventilation obstacle on airflow can increase the effective air volume of working zone, accordingly improve......
volumetric sediment transport was calculated, followed by the modification of the river bed altitude and configuration. Boundary adaptive mesh technique was employed to modify the grid system..., three azimuthal planes are arranged, as shown in Fig. 14. On each plane, the scour hole shape is characterized by the bed altitude stretched from the pier surface to a radial distance of 3.71 cm......
the relation between the depths of feature points and the aircraft altitude. Finally, simulation results show that the method presented is accurate and robust. Key words: optical flow; motion estimation... use of the visual information of the surrounding environment, and relies on vision sensors only to realize the aircraft’s 6-DOF motion estimation in real time, which can be used in indoor, low altitude......
. 6 Atmospheric pressure changes with altitude 以该重型直升机不同的飞行速度为进口边界条件,随高度变化的大气压为压力出口边界条件进行仿真,得到在不同速度和不同高度下前飞时出口边界的参考压力.图7所示为重型直升机在近地面以最大飞行速度飞行时不同截面压力云图.可见:侧气口周围空气压力平均值约为98 kPa,上气口周围空气平均压力约为100 kPa,均小于标准大气压. 图7 截面压力云图 Fig. 7 Pressure cloud of cross-section 侧气口和上气口在不同飞行速度和高度下的参考压力如图8所示. 图8 边界参考压力与飞行速度和高度的关系 Fig. 8 Relationship between boundary reference pressure and flight speed and altitude 从图8可以看出......
to analyse the steady performance. The results show that airflow function induced by moving EMUs to insulted board is mainly lift force. To the same altitude insulated board, the function is bigger from worse......
-actuated subsystem was composed of two independent loops with altitude and yaw angle, while the under-actuated subsystem had four state variables and two control variables. Secondly, a backstepping based......
characteristic of water valve was studied comprehensively, and the effects of various factors, such as opening speed, opening altitude, hydraulic pressure, internal leakage, on opening force of water valve were......
