پويان طاحونه

In this research, a comprehensive review of past studies on the design and optimization of train energy absorbers, particularly rectangular tube absorbers, has been conducted. Then, based on a reference paper, a new design has been proposed to improve the previous design, demonstrating better energy absorption performance. In this design, a perforated rectangular tube is placed between the diaphragms of the energy absorber and inside the main tube. To eva‎luate the performance of this absorber, simulation validation is first carried out, and its results are compared with the experimental tests from the reference paper. The results indicate that the simulated model closely aligns with the experimental results. In the next stage, an initial model of the new absorber is prepared and compared with the optimized model from the reference paper. It is found that the new absorber has a higher energy absorption capacity compared to the old absorber. To investigate the effect of influential parameters on energy absorption, two parameters, hole size and internal tube thickness, are selected and each is examined. Using the obtained results, numerical modeling is performed and, using a multi-objective genetic algorithm with two defined objectives—minimum impact force during displacement and maximum specific energy absorption—this structure is optimized. After plotting the Pareto front, the optimal points are identified. To verify the results obtained from the numerical model, these two optimized models are re-simulated with software. The results show that the selected optimized model achieves a 23.2% increase in specific energy absorption compared to the model from the reference paper. Subsequently, the optimized model is analyzed under misaligned loadings and discussed, demonstrating stable and adequate performance according to standards.

جاذب‌هاي انرژي , بارگذاري ناهم‌راستا , بهينه‌سازي چندهدفه , لوله‌هاي جدارنازك

energy absorbers , Offset Loading , Multi-objective optimization , Thin-Walled Tubes

Pooyan Tahoone

Dr. Parisa Hosseini Tehrani