To investigate the aerodynamic effect of wind barriers on a high-speed train-bridge system, a sectional model test was conducted in a closed-circuit-type wind tunnel. Several different cases, including with and without barriers, with different barrier heights and porosity rates, and with different train arrangements on the bridge were taken into consideration; in addition, the aerodynamic coefficients of the train-bridge system were measured. It is found that the side force and rolling moment coefficients of the vehicle are efficiently reduced by a single-side wind barrier, but for the bridge deck these values are increased. The height and porosity rate of the barrier are two important factors that influence the windbreak effect. Train arrangement on the bridge will considerably influence the aerodynamic properties of the train-bridge system. The side force and rolling moment coefficients of the vehicle at the windward side are larger than at the leeward side. wind barrier, train-bridge system, wind tunnel, aerodynamic coefficient, windbreak effect Citation: Guo W W, Wang Y J, Xia H, et al. Wind tunnel test on aerodynamic effect of wind barriers on train-bridge system. Sci China Tech Sci, 2015, 58: 219225,
In the satellite pose estimation problem, the deep learning method is used to train the network. The satellite pose needs to estimate the rotation (R) and translation (T), which are difficult to be well estimated simultaneously due to the internal coupling interaction. To solve the above problems, a dual-channel satellite pose estimation network based on ResNet50 is proposed to decouple the rotation and translation of satellite, effectively avoid the interaction, and estimate the translation and rotation of satellite respectively through the constructed network, which improves the recognition effect of satellite attitude. Through experimental verification, the network model constructed in this paper has better effect on the estimation of rotation and translation compared with other methods.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.