Study On The Bidirectional Bearing Honeycomb Anti-creeper And The Evaluation Of Energy Absorption Capacity

With the popularity of rail train and the increase of railway running mileage,trains and subways have become the main choices for people to travel.However,because of the continuous improvement of modern train speed and increasing loading capacity,train accidents also increase.In order to reduce the damage caused by train collision as much as possible,the energy absorption device of the train has gradually appeared in the development of the train,among which the anti-creeper is the main buffer device of current train.The development of the anti-creeper has been highly paid attention by the rail vehicle industry.Meanwhile,influenced by the unidirectional load-carrying capacity of the honeycomb filling core inside the traditional honeycomb anti-creeper,the ability of the anti-creeper to bear longitudinal and vertical loading is extremely unbalanced.Therefore,it is of great significance to develop an anti-creeper with excellent bi-directional load-carrying capacity.This study first introduces the configuration selection of bi-directional load-carrying honeycomb.Through the analysis of various configuration design and machining feasibility,the “plate-added honeycomb” configuration with good bidirectional load-carrying capacity is selected as the focus of this study.Then the anti-creeper is designed according to the requirements,mainly including the design details of the anti-creeper and determination of the strength grade of the shearing bolt through theoretical calculation.Second,aluminum alloy tensile test is conducted to get the data as input information to develop the hexagonal honeycomb model,and the “plate-added honeycomb” was made according to the load-carrying capacity parameters obtained by the simulation.Compression simulation on the honeycomb small block was performed to prove that the load-carrying capacity of the honeycomb core is consistent with the simulation results and meets the design requirements of honeycomb strength.At the same time,according to the strength of the honeycomb,an equivalent honeycomb model which can well reflect the mechanical properties of the original model is established.Then,the finite element model of the anti-creeper is combined with the equivalent honeycomb to form the collision model of the anti-creeper,and the performance of the anti-creeper is simulated and analyzed.The analysis results show that the performance of the anti-creeper meets the design requirements of the train.Finally,the coupling simulation of the whole vehicle and the anti-creeper model is carried out.Referring to the collision standard of urban rail train in EN15227,three different collision conditions are designed and analyzed comparatively: a single train without anti-creeper impacting the fixed rigid wall,a single train with anti-creeper impacting the fixed rigid wall,and a train with anti-creeper having a vertical offset of40 mm impacting another stationary train of the same type.The evaluation includes velocity change in the process of collision,the driver chamber deformation degree,the energy absorption and the most seriously damaged parts.Through the comparative analysis of three groups of simulations,it proves that the new design of bi-directional load-carrying honeycomb anti-creeper exhibits good longitudinal and vertical energy absorption capacity.Therefore,It can effectively protect the train body and can meet the energy absorption design requirements of the new subway train.