| As an important part of the civil aviation airport equipment,the airport baggage transfer vehicles are mainly used for loading and unloading of luggage,parcels and mail.With the rapid development of civil aviation industry in China,the demand for baggage transport vehicles is increasing.Meanwhile,the requirements of the vehicles' performance are also constantly improved.In order to meet the requirement,this paper employed the virtual prototype technology to optimize the structure and function of the baggage transport vehicles.With the development of CAD and CAE technology in the field of airport special vehicles,virtual prototyping technology shows the advantages of shortening the research and development cycle and improving the efficiency of the product optimization process.Consequently,the virtual prototype technology is wildly used in optimizing the existing airport special vehicles and developing new products.In this paper,a certain type of baggage transport vehicle is taken as the research object.and the virtual prototype is used as the research platform.The four-wheel steering function is designed for the baggage transfer vehicle,and subsequently the main working parts such as the lifting mechanism,the frame and the conveyor belt frame are structurally optimized.According to the size parameters,the CREO is used to carry out a three-dimensional model of the whole vehicle,including the lifting mechanism,the conveyor belt frame,the frame,the steering mechanism,etc.The two-degree-of-freedom motion differential equation of the four-wheel steering is established.Combined with Ackerman's steering theorem,the mathematical relationship between rotation angles is solved,and the four-wheel angle control method is designed.The turning radius is shortened from the original 7600 mm to4576mm.The parametric model of lifting mechanism is constructed with the ADAMS.Simultaneously,the kinematics analysis and simulation analysis of this part are completed.According to the results of research on the influence of design variables,optimization design analysis,and experimental design analysis,the size parameters that have a significant impact on the initial hydraulic lift are determined(i.e.the position of the arm beam and the installation position of the front lifting hydraulic cylinder hinge point).By analyzing the curves of the initial hydraulic lifting force with each design variable,the optimal location ofthe main hinge point on the lifting mechanism is obtained.The layout scheme makes the initial hydraulic lift drop from the original 37025 N to 27665 N.Finally,the ANSYS software is used to carry out the strength check and structure optimization of the conveyor belt frame and the frame,and the conveyor belt anti-running design is carried out.The optimized conveyor belt frame improves the utilization of material properties.Additionally,when it meets the requirement of the rigidity and strength,the overall mass could be reduced by 11.8%.After the optimization,the maximum displacement deformation of the frame is reduced by 65%,and the maximum stress is reduced by 52.8%,which significantly improved the stress layout.This paper optimizes the structure of the main working parts of the baggage transfer vehicles and designs the four-wheel steering function,which solves the problem that the steering is cumbersome as a long-wheelbase characteristic vehicle.It also improves the working performance of the lifting mechanism,and modifies the stress condition of the baggage conveyor belt frame and the vehicle frame.This paper may provide a reference for the performance improvement of the baggage transfer vehicles and the development of new products. |
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