Vector Orientation Positioning Method about Tower Spatial Model of Transmission Towers

Because of a large number of tower elements in transmission tower, and direction of cross section is complex, it is difficult to quickly set up a space model at the same direction with the actual transmission line tower structure. In this paper, using the method of vector orientation. Define tower element cross section in the local coordinate system, and by targeting vector method locating element of tower in the global coordinate system. The orientation of vector method of tower material has simple steps, easy to implement, and modelling fast. 1 Foreword Because of a large number of the tower element in the power transmission tower, section of the tower element consists of the angle steel and the steel tube etc several types, and direction of the cross section of the tower element is very complex, it is difficult to quickly set up a space model which is consistent with direction of the tower element in the actual power transmission tower structure (1) , orientation of the tower element in the power transmission tower becomes the main technical bottle neck for modelling of the spatial model of the power transmission tower. The beam unit modelling of the power transmission tower is realized if orientation of the tower element in the power transmission tower structure is solved. Finite element model of the power transmission tower generally applies the rod unit model for modelling. The rod unit model is characterized with bearing drawing and compressing and not bearing bending moment. This characteristic isn't same as the real model tower, the real model tower is also affected by the bending moment. Therefore orientation direction of the section shall be considered during modelling of the beam unit. Only when orientation of the tower element is basically consistent with actual conditions, accurate simulation effect can be obtained (2) .