Simulation Analysis And Optimization On Active Anti-galloping Device Of Overhead Transmission Line

The active anti-galloping device is used to restrain the galloping of overheadtransmission line. It plays an important role in avoiding flashover of wires and preventingdumping of the transmission tower, which can be applied to various conditions. Takingexample of the active anti-galloping device, an anti-galloping device virtual prototypemodel with the mechanical system kinetic analysis software MotionView on the basis ofmulti-body system dynamics, then the simulation results are detailed checked and analyzedto verify the credibility of virtual prototype. On the platform of virtual prototype,kinematics and dynamics characteristics of active anti-galloping device in working processare systematically researched. Finally, dynamic analysis of the anti-galloping device withthe finite element method is analyzed to verify its strength and stiffness and the structure ofpendulum is optimized. The main work of paper is as follows:Firstly, the research and development conditions in home and aboard of galloping ofoverhead transmission lines in correlative fields are generalized and the mechanism and thecause of dancing and analyzed. The whole modeling scheme is established.Secondly, the3-D entity model of the active anti-galloping parts is established by the3-D entity sculpt software Pro/E，and then assembly model of the anti-galloping device isbuilt by means of adopting from bottom to tip. Based on the assembly model, thekinematical simulation of the system is done. Then, the3-D entity model is reasonablysimplified and transmitted into the multi-body dynamic simulation software MotionViewwith the module CAD/pro. Through adding constraints and forces to the components of theactive anti-galloping device, the virtual prototype model is built. After that, MotionViewself-testing software is used to preliminarily verify the virtual prototype.Thirdly, the contact simulation parameters are gained on the basis of Hertz theory.Then, the meshing force of the gear and rack and the force graph of main parts are gainedby simulation. The simulation results can be used as boundary conditions of finite elementanalysis and load conditions of the strength.Fourthly, the grid of main parts are divided with the finite element pre-processingsoftware HyperMesh. Through adding material properties, constraints, boundary conditionsand load to the components, the finite element model of anti-galloping device is built. Then,the finite element model is transmitted into the nonlinear dynamic software LS-DYNA andthe stress nephogram and deformation nephogram of components are gained and analysed. it is concluded that the structure satisfy the requirement of stress and stiffness and there isno damage and fracture. Finally, the pendulum structure is optimized by method of variabledensity. After topology optimization, the reconstructed model is lighter than the former inweight.