Optimasi Parameter Desain Multi-Cell Hexagonal Crash Box terhadap Absorbsi Energy Impact dengan Metode Taguchi

The crash box is a passive safety system placed between the bumper and the mainframe of the car that functions as an energy absorber to reduce the impact of driving accidents. The purpose of this study is to determine the optimal level of factors and analyze the factors that provide the most significant effect on energy absorption in a multi-cell hexagonal crash box. Identification of parameters that affect the crash box in energy absorption, namely: the position of placement hole (P), the distance of position hole (L), the thickness of crash box (t), and the hole diameter (D). The modeling method has used the design of the crash box by utilizing a computer simulation with software ANSYS 17.0. This research uses aluminum material type AA 6061-T4 and impactor material uses structural steel. Modeling loading using the frontal crash test method. In this modeling, the impactor with a speed of 7.67 m/s with a deformation length of 100 mm. This research uses the experimental design of the Taguchi method with the L27 orthogonal array. The optimization result were obtained optimum design parameter multi-cell hexagonal crash box with parameter settings P = inner wall; L = 112.5 mm; t = 2 mm, and D = 6.6 mm. Based on the calculated F value ≥ F Table, the factors P, t, and D affect the ability to absorb energy. Thickness crash box (t) has the highest contribution of 98.10% in increasing the value of energy absorption.

Numerical Simulation of Gas-Liquid Two-Phase Flow in Multi-Impeller Pre-Oxidation Reactor

Numerical simulation of gas-liquid two-phase flow in the tank of multi-impeller pre-oxidation reactor was studied in this article. The dispersion of gas phase in liquid phase without agitator mixing and the distribution of gas-liquid two-phase flow with agitator mixing were simulated. The characteristics of gas-liquid two-phase flow and the regularities of the gas distribution in the reactor were achieved through analyzing the numerical simulation results. The dissolved oxygen in different cross sections of the reactor without agitator mixing was measured in the water test, which was used to verify the numerical simulation results. And the test results were almost the same with the simulation results, which can provide a reference for determining the optimum design parameter of this type of reactor.