Research on the optimization of welding parameters in high-frequency induction welding pipeline

In this study, a Back Propagation (BP) neural network algorithm based on Genetic Algorithm (GA) optimization is proposed to plan and optimize the trajectory of a redundant robotic arm for the upper limb rehabilitation of patients. The feasibility of the trajectory was verified by numerical simulations. First, the collected dataset was used to train the BP neural network optimized by the GA. Subsequently, the critical points designated by the rehabilitation physician for the upper limb rehabilitation were used as interpolation points for cubic B−spline interpolation to plan the motion trajectory. The GA optimized the planned trajectory with the goal of time minimization, and the feasibility of the optimized trajectory was analyzed with MATLAB simulations. The planned trajectory was smooth and continuous. There was no abrupt change in location or speed. Finally, simulations revealed that the optimized trajectory reduced the motion time and increased the motion speed between two adjacent critical points which improved the rehabilitation effect and can be applied to patients with different needs, which has high application value.

/pdf/trajectory-planning-and-simulation-study-of-redundant-1v604szt.pdf

Trajectory Planning and Simulation Study of Redundant Robotic Arm for Upper Limb Rehabilitation Based on Back Propagation Neural Network and Genetic Algorithm

This paper presents a fully coupled three-dimensional finite element model for the simulation of a tube manufacturing process consisting of roll forming and high-frequency induction welding. The multiphysics model is based on the dual mesh method. Thus, the electromagnetic field, the temperature field, the elasto-plastic deformation of the weld bead, and the phase transformations within the material can be simulated for a moving tube without remeshing. A comparison with measurements shows that the geometry of the welded tube and the weld bead, the force on the squeeze rolls, the temperature along the band edges, and the hardness distribution within the heat-affected zone can be simulated realistically.

https://www.mdpi.com/1996-1944/15/3/1270/pdf?version=1644397931

Numerical Simulation of Tube Manufacturing Consisting of Roll Forming and High-Frequency Induction Welding

Critical conditions for melting of metallic wire in induction heating system through numerical simulation and experiments

The flow of the thermionic emission always creates evaporating the material on high temperature in vacuum. This flow deposits onto the plane of the condensed material and can be used for the non-invasive research of the condensate electrical properties. Also this flow can give information about the temperature and the state of the evaporator [1]. However, in the camera of the evaporating system the flow of the thermionic emission charges is under the influence of the electromagnetic field, created by the alternating current of the evaporator, and the electrostatic field, created by the supply voltage of the evaporator. These fields are also natural and it is not impossible to decrease their influence. Under the influence of these fields the direction of the charges flow and the current density become alternate and they are alternating periodically together with the alternation of the supply voltage. It was beholden, that the reaction of the charges flow to the influence of the fields was with delay during the experiment. The flows became steady only after few milliseconds, when the voltage supply was turned out. The theoretical research modelling the all vacuum system is complicated enough. There are many metalical constructions of the different configurations in it, also the construction of the evaporator is complicated having curvilinear planes [2,3] and the alternating electromagnetic and electrostatic fields are acting in it. Also it is complicated to estimate the influence of the space charge. Therefore the experimental way [4] was chosen to investigate how we can to use the flows of the nature emission for the information about the evaporation and condensation processes.

Electronics and Electrical Engineering : Proceedings of the 2014 Asia-Pacific Electronics and Electrical Engineering Conference (EEEC 2014), December 27-28, 2014, Shanghai, China

Zixiao Liu

Papers

Research on the optimization of welding parameters in high-frequency induction welding pipeline

Circular trajectory weaving welding control algorithm based on space transformation principle