以某500 k V工程为例,针对城区输电线路建设面临走廊、景观等诸多限制条件的问题,提出一种新型钢管杆的杆塔形式,从加工可行性、材质、结构布置、截面形状、试验等方面进行分析比较。所得结果表明:材质推荐Q460高强钢;直线杆采用双杆布...以某500 k V工程为例,针对城区输电线路建设面临走廊、景观等诸多限制条件的问题,提出一种新型钢管杆的杆塔形式,从加工可行性、材质、结构布置、截面形状、试验等方面进行分析比较。所得结果表明:材质推荐Q460高强钢;直线杆采用双杆布置,椭圆形截面;耐张杆采用四杆布置,正多边形截面;杆体及节点的强度和刚度均符合设计要求,并有一定的安全储备。新型钢管杆为市区输电线路提供了有效的解决方案。展开更多
According to the combination of the complementary medium and transformation optics, the shape of two-dimensional (2D) internal-external cloaks has been generalized into any geometry to adapt to the variety of object s...According to the combination of the complementary medium and transformation optics, the shape of two-dimensional (2D) internal-external cloaks has been generalized into any geometry to adapt to the variety of object shapes. In order to adapt to the practical application, some approximations have been introduced to eliminate the infinite singularity of the parameters in the compressed region by adjusting the principle sketch out of the plane. Firstly, the general parameter equations of the nonsingular cloak with arbitrary cross-section are deduced strictly by the mathematical method based on coordinate transformations in the cylindrical coordinate system. Secondly, taking into account the discontinuous property of the curve functions of arbitrary polygons, a supplementary investigation is given for the nonsingular cloak with arbitrary polygonal cross-section. The transformations in the supplementary study are carried out in the Cartesian coordinate system directly and referred to the coordinates of the polygon's vertices rather than the curve function of the polygon. Last, the invisibility effect of the corresponding cloak is studied by full-wave simulations based on the finite element method. The applicable scope of the 2D internal-external cloak is expanded greatly by the methods and results given in this paper.展开更多
文摘以某500 k V工程为例,针对城区输电线路建设面临走廊、景观等诸多限制条件的问题,提出一种新型钢管杆的杆塔形式,从加工可行性、材质、结构布置、截面形状、试验等方面进行分析比较。所得结果表明:材质推荐Q460高强钢;直线杆采用双杆布置,椭圆形截面;耐张杆采用四杆布置,正多边形截面;杆体及节点的强度和刚度均符合设计要求,并有一定的安全储备。新型钢管杆为市区输电线路提供了有效的解决方案。
文摘According to the combination of the complementary medium and transformation optics, the shape of two-dimensional (2D) internal-external cloaks has been generalized into any geometry to adapt to the variety of object shapes. In order to adapt to the practical application, some approximations have been introduced to eliminate the infinite singularity of the parameters in the compressed region by adjusting the principle sketch out of the plane. Firstly, the general parameter equations of the nonsingular cloak with arbitrary cross-section are deduced strictly by the mathematical method based on coordinate transformations in the cylindrical coordinate system. Secondly, taking into account the discontinuous property of the curve functions of arbitrary polygons, a supplementary investigation is given for the nonsingular cloak with arbitrary polygonal cross-section. The transformations in the supplementary study are carried out in the Cartesian coordinate system directly and referred to the coordinates of the polygon's vertices rather than the curve function of the polygon. Last, the invisibility effect of the corresponding cloak is studied by full-wave simulations based on the finite element method. The applicable scope of the 2D internal-external cloak is expanded greatly by the methods and results given in this paper.
