Research On Transportation Safety Of Large Aircraft Middle Fuselage Rapid Transporter

The development of large aircraft is one of the major projects of national medium and long-term science and technology plans.Components are independently manufactured and technology mode is entirely assembled,and which are need to be transported to the final assembly plant and then assemble the large aircraft completely.Considering the locations of final assembly plant and producing area of middle fuselage,large size middle fuselage can’t be transported timely and effectively by air,by sea or by railway,so we adopted land transportation way to realize the rapid transit to ensure the project go on smoothly.Middle fuselage is a large and sophisticated equipment which is knowledge technology intensive and material resource consumption large,its importance is related to the progress of large aircraft project and even to the development strategy of whole country.The large aircraft middle fuselage rapid transporter is the first domestic self-developed transporter which is used to transport large aircraft middle fuselage.The transporter’s driving safety is the most important indicators.Combining with the characteristic of 1600 km road conditions,the transporter can realize long-distance safe transportation mainly by reliable security structure,excellent electric hydraulic control system,good vibration damping buffer performance and effective aerodynamic characteristics.Combining with the practical application conditions,the coordinated control of hydraulic system,the vehicle ant-vibration characteristics and vehicle aerodynamic characteristics are researched deeply.The coordinated control of the hydraulic system of the middle fuselage rapid transporter is researched.A multi-domain coordinated control mathematical model of mechanical and hydraulic system is established.The manual control hydraulic system and semi-automatic control hydraulic system are designed.The synchronization characteristic of extended hydraulic cylinders and overturning hydraulic cylinders from the positive load to the exceeding load,the pressure characteristics of lifting hydraulic cylinders during coordinated control process and the synchronous control characteristic of middle frame are compared and analyzed.The optimal hydraulic control system is selected to improve the handling and safety of the transporter.The anti-vibration characteristics of the high speed long-distance transporter loading middle fuselage are researched.Designed four positioning bracket structure,gooseneck damping buffer device,and the limit of high positioning vibration damping device,analyzed the actual driving conditions,proposed the vibration mathematical model of the middle fuselage transporter in load,static analyzed the anti-vibration safety device,simulated and analyzed the vibration character of transporter running through D level road,speed bumps and emergency braking,meeted the requirements of the middle fuselage’s vibration accelerate prescribed scope(±2g、±3g and ±4g)in transverse,longitudinal and vertical direction,improved the middle fuselage’s transport security.The aerodynamic characteristics of the high speed long-distance transporter loading middle fuselage are researched.Designed the adjustable gooseneck guiding device and adjustable extension flip structure,established the aerodynamic mathematical model,utilized the analysis method of flow field numerical wind tunnel simulate,compared with the transporter with no air diversion structure,analyzed transporter and middle fuselage’s aerodynamic characteristics with different articulated angle and pitching angle,proposed the gooseneck guiding device best pitching angle,decreased the air force of transporter and middle fuselage,ensured the transportation safety of middle fuselage.The optimal hydraulic control system is determined by the hydraulic system coordinated control test,the anti-vibration safety device stress test and the anti-vibration characteristic test of the transporter loaded the middle fuselage model,and the effectiveness of the anti-vibration safety devices of the invention are verified.Which verifies the accuracy of the theoretical analysis of hydraulic system coordination control and vehicle anti-vibration characteristics,and further ensures the safe transportation of the middle fuselage.