Stability Analysis And Structure Optimization Of Hybrid Threedimensional Bus Garage

In recent years,with the increasing number of cars,the urban static traffic pressure is growing day by day.In view of the current situation,the demand for urban parking space is rising year by year.In order to meet the needs of parking,the three-dimensional bus garage has been developed rapidly.However,the existing garages are mostly intended for smaller cars.In order to better meet the parking needs of modern cities,it is urgent to develop three-dimensional bus garages for wider ranges.This paper mainly studies the hybrid three-dimensional bus garage for housing both buses and smaller cars.The whole frame structure and the main working devices are analyzed and experimented to testify the designing feasibility of the hybrid three-dimensional bus garage.The research contents and conclusions are mainly as follows:（1）This paper introduces the overall structure and working principles of the hybrid threedimensional bus garage,analyzes the design of the garage mechanical frame structure and expounds the design,structure composition and working guidelines of the rack and pinion handling and the two elevating devices,and also introduces the control scheme of the garage prototype.（2）The static analysis of the hybrid three-dimensional bus garage under three different working conditions of no-load,off-load and full load is carried out by using finite element software to obtain the stress-strain cloud map of the overall structure and thus conclude the mechanical properties of the garage.The above analysis shows that the stress-strain results of the designed device are all within the allowable range.Secondly,the buckling analysis of the column and beam of the garage frame shows that the stability of the device meets the requirements.In order to avoid the influence of resonance on the structure,the modal analysis of the steel frame structure of the mixed stereo garage is conducted under different working conditions.Additionally,the corresponding vibration frequency value is obtained to improve the safety and reliability of the garage as a whole.（3）This thesis introduces the structure design of rack and pinion handling traverse device and two-store elevating device of mixed stereo garage,and carries out the corresponding calculation and analysis of the device.Through the simulation analysis of the structure under specific working conditions,the reliability and rationality of the design device can be verified.（4）The static test platform is built to mechanically test the beams and columns of mechanical parking equipment and loading board.The results are compared with the simulation data of the two-layer lifting device dedicated for smaller cars.It is found that both the experimental data and the simulation data are within the allowable theoretical values and the former ones are slightly higher than the latter ones.Overall speaking,the design of the twofloor elevating parking device satisfies the designing requirements and actual needs.（5）Because of the larger volume and weight of the hybrid three-dimensional bus garage,the preliminary size is designed probably a little larger in order to minimize the weight of materials used for h-beam and meet the requirement of mechanical properties.At the same time,considering the economic benefit and the wider promotion,the three-dimensional garage hbeam is optimized and analyzed accordingly so as to have completed the lightweight design of the hybrid three-dimensional garage.And the stress and strain analysis of the optimized structure is then performed to have shown that the weight of the garage is effectively reduced within the allowable range of mechanical properties.