| With the rapid economic development and the increasingly tense situation of land resources, high-rise buildings gradually cover most parts of the city. In addition, growing of traditional industries and chemical companies, the unexpectation and scurviness of fire and fire combat mission will put the performance of fire-fighting equipment to a more severe test. The slewing mechanism’s, as an important institution of the aerial platform fire engines, performance largely determines the performance of the vehicle. In addition, as the working height increases, the rotary inertia will increase correspondly, which will inevitably lead to strong pressure shocks. The pressure of the impact will not only affect the stability of the entire hydraulic system, but also result in jitter of the turntable, boom and platform, lower the service life of hydraulic components, affect the stability and reliability of the vehicle work. Good design of hydraulic system not only maintains the stability of performance, improves efficiency, reduces energy consumption, but also easies maintenance, lowers utility cost.In this dissertation, it takes the one-hundred-meter aerial platform fire engine, which is developed by the cooperation of New Dafang Heavy Industry Science and Technology Co., Ltd. and Dalian University of Technology, as the practical engineering background. Based on the design, the calculation and the analysis of the slewing hydraulic system, with the AMESim simulation software, it gives the simulation model of the slewing hydraulic system, and explores better design of the slewing hydraulic system.(1) It describes one-hundred-meter aerial platform fire engine slewing institutions and its hydraulic system, the calculation of rotating moment of resistance, component selection, parameter matching and introduces the test target.(2) Based on AMESim simulation software, it establishes the simulation model of the rotary hydraulic system of the fire truck with one hundred meters platform. In addition, this paper compares and analysis the model with the practice of sample parameters.(3) It analysis the effect of various factors and parameters on the dynamic response of slewing hydraulic system. Based on reducing the pressure shocks, it gives the optimization of the hydraulic system, advances the method of the parameters set of start-up and down time.(4) Though the analysis of simulation model, it receives that we can optimize the system through improving the damping characteristics of the brake circuit, and it will improve the dynamic characteristics of the hydraulic system, as well. All of this will give the design of high platform fire engine slewing hydraulic system certain guiding significance. |
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