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Improves the Brake Working of the Rescue Winch to Control the Stop Brake Process

Duong Truong Giang, Nguyen Van Thinh

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 1

255--267

High-altitude rescue is an issue that always receives great attention. Using rescue winches on the outside of structures is a popular solution. During the rescue process, when the brakes stop, it will affect the human body, causing discomfort, especially when the rescue subjects include the elderly and children. The purpose of the research is to find a reasonable brake structure solution and parameters to improve performance, allowing for increased speed while still ensuring smooth acceleration when braking and controlling shock. This article develops calculation formulas describing the braking process and develops a method for selecting design parameters to control the braking process including spring deformation, spring stiffness, braking time, etc. The study uses the orthogonal matrix, analyzing the influence of parameters on the response function, and spring stiffness. Applying numerical testing to the design to increase the speed by 300%, the result is that the acceleration when braking is reduced by 67.75% compared to the previous study, and the shock in the range is smaller than the allowable value.

Optimizing the weight of the two-level gear train in the personal rescue winch

Duong Truong, Nguyen Van Tinh, Nguyen Tien Dung

Archive of Mechanical Engineering

2021

LXVIII, nr 3

271--286

In the previous study, we designed one personal rescue winch for high-rise building rescue. Its key requirement is to be small and light enough to suit users. In addition to using lightweight and reasonable materials as in the proposed winch design, in this study, we proceed to optimize the weight of one two-level gear train, which accounts for a large proportion of weight. The first stage is building a weight optimization problem model with seven independent variables, establishing one optimal algorithm, and investigating the variables by Matlab software. The other is replacing the web material of the gears and pinions with Aluminum 6061-T6 and optimizing their hole diameters and hole numbers through using Ansys software. The obtained result shows a significant weight reduction. Compared to the original design, the weight reduces by 10.21% and 52.40% after the first optimal and last stages, respectively.