On the basis of the canard configuration a contour stealth design including chiefly the wing, the fuselage and their connection type is projected. The prime project of a blended wing body vehicle with canard is provid...On the basis of the canard configuration a contour stealth design including chiefly the wing, the fuselage and their connection type is projected. The prime project of a blended wing body vehicle with canard is provided and through the change of the fuselage head form and the different fin disposals, the radar cross section (RCS) is optimized. The average value of RCS and the value of RCS in the ± 45 ° front sector for different designs are illustrated. The model measurement proves that the project having a sharp head fuselage and 30 ° angle double fin has the minimum value of RCS. The wind tunnel test to the model with RCS optimized proved that the vehicle project has excellent aerodynamic characteristics such as high lift curve slope, up to 26° stalling angle, high lift / drag ratio equal to 8, and also has low RCS value in the front sector and in the lateral sector.展开更多
哈密—郑州±800 k V直流输电线路中大量采用双柱悬索拉线塔,双柱悬索拉线塔由双立柱支撑结构及拉线悬索系统所组成,在概念和设计上均较为简洁,主要受风荷载控制。为研究其风致振动动力响应特点,制作并进行了气动弹性单塔模型和塔...哈密—郑州±800 k V直流输电线路中大量采用双柱悬索拉线塔,双柱悬索拉线塔由双立柱支撑结构及拉线悬索系统所组成,在概念和设计上均较为简洁,主要受风荷载控制。为研究其风致振动动力响应特点,制作并进行了气动弹性单塔模型和塔线体系模型的风洞试验,测定了在紊流风场中的风振响应,揭示了此类输电塔的荷载传递机制。研究结果表明:在紊流风场中,结构的顺风向和横风向响应处于同一数量级;随风速增加,背风侧拉线趋向松弛,背风侧立柱受压减小;迎风侧拉线张紧,迎风侧立柱受压增大,因而在设计时,需考虑拉线断线和受压立柱动力失稳问题。展开更多
文摘On the basis of the canard configuration a contour stealth design including chiefly the wing, the fuselage and their connection type is projected. The prime project of a blended wing body vehicle with canard is provided and through the change of the fuselage head form and the different fin disposals, the radar cross section (RCS) is optimized. The average value of RCS and the value of RCS in the ± 45 ° front sector for different designs are illustrated. The model measurement proves that the project having a sharp head fuselage and 30 ° angle double fin has the minimum value of RCS. The wind tunnel test to the model with RCS optimized proved that the vehicle project has excellent aerodynamic characteristics such as high lift curve slope, up to 26° stalling angle, high lift / drag ratio equal to 8, and also has low RCS value in the front sector and in the lateral sector.
文摘哈密—郑州±800 k V直流输电线路中大量采用双柱悬索拉线塔,双柱悬索拉线塔由双立柱支撑结构及拉线悬索系统所组成,在概念和设计上均较为简洁,主要受风荷载控制。为研究其风致振动动力响应特点,制作并进行了气动弹性单塔模型和塔线体系模型的风洞试验,测定了在紊流风场中的风振响应,揭示了此类输电塔的荷载传递机制。研究结果表明:在紊流风场中,结构的顺风向和横风向响应处于同一数量级;随风速增加,背风侧拉线趋向松弛,背风侧立柱受压减小;迎风侧拉线张紧,迎风侧立柱受压增大,因而在设计时,需考虑拉线断线和受压立柱动力失稳问题。
