| The hydraulic maintenance vehicle for aviation is an important equipment on the ground to ensure the safety of the flight and the supply of hydraulic oils. To meet the strict requirements of modern aircraft on maintenance, a novel multi-functional vehicle for aerial hydraulic maintenance is designed. This paper has completed the following work:1. The overall system design. Firstly, a solutions to the maintenance is proposed based on the analysis of the vehicle designing requirement, and the hydraulic circuit that can realize all purposes in one vehicle and active hydraulic oil purification is designed. By using module design method, the vehicle is designed by composing of hydraulic system, power system, control system and auxiliary mechanism according to the maintenance work demand, and the functions and basic components of different systems is described.2. The centrifugal oil purifier structure design. The structure of centrifugal oil purifier in existence is improved to make it match the active oil purification circuit for realizing the active oil purification. The improvement of the structure for centrifugal oil purifier can enhance the self-priming ability of it, and can realize all-round removal of solid, liquid and gaseous pollutants. Then the centrifugal separation process is analyzed and the principle of centrifugal purification is clarified based on the improvement of structure. Finally, the purification effect between traditional filter and the improved centrifugal oil purifier is analyzed and the characteristics of centrifugal oil purifier are summarized.3. Main structure design and type selection. The technical parameters is determined based on the application requirement and working parameters of maintenance objects, including the pressures and flow of oil inlet and outlet, oil temperature, and so on. The hydraulic circuits of different working modes are integrated and the schematic diagram of hydraulic system is drawn according to overall system design and maintenance working conditions. Finally, the main components of hydraulic system, power system and auxiliary mechanism are calculated and selected.4. Control system design. In order to meet the requirement of the accurate and flexible control of maintenance vehicle, a control scheme that the control object is direct driven was proposed taking PLC as the core and PC as an assistant controller. The control objects can be real-time controlled, including the units of motors, oil parameters and failure protection. Second, the hardware of upper computer PC are disposed, and the modules of PLC are determined and the hardware structure of control system is obtained based on the function of PLC. Then the hardware configuration of PLC is illustrated using the software of STEP 7. The temperature, level and pressure subprograms are written. Finally, the computer-human interfaces are designed using LabVIEW, including the initialization, maintenance control, data storage management and exit. The maintenance work can be controlled and monitored. |
PDF Full Text Request