The surface of large equipment is often coated with anti-corrosion or specialized coatings with special functions. During daily use, local coating detachment may occur on the surface of the equipment due to collision and wear, making it difficult for manual operation to reach. Therefore, specialized equipment is needed for coating repair work. In order to meet the requirements of complex surface working conditions and have the functions of checking the surface coating status, determining the repair position, polishing the repair position, and repairing the paint, a surface walking and climbing robot based on permanent magnet adsorption is proposed. This article carried out the design, manufacturing, and final assembly of a coating repair climbing robot, and completed the process validation test of the prototype. The experiment shows that the wall climbing robot using permanent magnet adsorption technology can reliably adsorb in places where the working surface is made of ferromagnetic materials such as steel. Image recognition, surface polishing, coating repair, etc. basically meet the requirements of use, effectively improving work efficiency.
Underwater drag reduction technology is one of the key ways to break through the ocean-going problem, and the bionic drag reduction is very promising in many types of drag reduction method. The bionic drag reduction is using the gasliquid interface slip effect, while the film is very unstable, leading to drag reduction function failure. The concave corner microstructure of springtail cuticle can make the air retention, which has very important significance to solve the problem of instability of gas film. In this paper, a simplified model is established by referring to the concave corner microstructures of springtail cuticle. The k-ε turbulence model is coupled with VOF method is used to establish a simulation model. The simulation results show that: with the increase in free shear area ratio, the drag reduction rate of the microstructure increases; the drag reduction rate of different microstructure is slightly different, but it is mainly related to the free shear area ratio.
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