| As a new type aerial work platform, the PT25spider-type aerial work platform will bemainly used in the adornment, maintenance and other assignments of big space structures,such as high-rise building, gymnasium and so on. The platform has the characteristics ofsafety, high efficiency, large working range, strong adaptability etc. The hydraulic system ofthe aerial work platform is researched by simulation analysis, to receive its dynamic processand operational state. This provides valuable reference for design and manufacture of theaerial work platform, and has important practical significance. The main works are as following：1.The hydraulic system has been analyzed in whole and local, which revealed thehydraulic system’s working principle. The logical relation between each action of platformand electromagnetic valves is achieved based on the working principle. The safety devicesand load-sensitivity multi-way value of the system have been done further research andanalysis, the objective is to confirm the security and stability of the system when machine isworking.2. According to the setting of the aerial work platform, the leveling method of chassis isdetermined. The chassis’s action is controlled by spider when the aerial work platform isworking. The simulation model of hydraulic circuit of spider-type outrigger is established inAMESim, and the variation curves of the parameters of hydraulic circuit in leveling processabout chassis, such as flow rates, displacements are achieved by simulation analysis. Then thedynamic process of hydraulic system of spider-type outrigger is reflected in intuitive way.3. Based on Pro/E software, the3D model of the whole aerial working platform isestablished. By introducing the model into the software of ADAMS, the dynamic model of theworking device is fulfilled. The hydraulic model is created by AMESim and the dynamicmodel are combined to obtain the united simulation model.4. The motion of working devices (telescopic cylinder, amplitude cylinder of telescopicboom and cylinder of folding arm) are analyzed by united simulation in three different modesof single movement, compound action and emergency braking of executive component. Time-varying curves of velocities, flow rates, displacements and stresses are obtained byunited simulation analysis. The stability and load sensitivity of this hydraulic system areverified.Taking the multiple simulation software, a feasible method to simulate and analyze thehydraulic system of aerial working platform is established. The results provide some scientificbasis and theoretical reference for the aerial working platform under actual and improving,simulation verification the hydraulic system. |
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