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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.

Determining parameters to optimize the pulling force for the luffing jib tower cranes by Taguchi method

Duong Truong Giang

Archive of Mechanical Engineering

2023

LXX, nr 3

387--407

The presented problem consists in optimizing the pulling force of the luffing jib tower cranes, in order to reduce power and save energy by determining reasonable geometrical parameters such as placement of pulley assemblies, position of jib pin, and jib length. To determine the optimal parameters, a mechanical model was developed to calculate the pulling force of the research object. Then, the Taguchi method and Minitab software were applied to evaluate the influence of the parameters. The objective function was the minimum pulling force of the luffing jib. The calculation results show that the position of the pulley assembly used to pull the jib is the most influential factor on the objective function accounting for 81.15%, the less significant factors are the jib length, the pin position of the jib, and the pulley assembly that changes the direction of the load lifting cable. The result of the test presented in the article allowed for determining the rational parameters, and the optimal position of the pulley assemblies on the top of the crane. In the case of the pulley assembly located at the top of the crane, one obtains the optimal height of the crane head H≈0.4 L c.