| The shield tunneling machine (STM) is a kind of large excavation sets that is used for the underground tunnel; it is more and more widely used in the tunnel excavation of cities. The work load of shield tunneling machine is fierce as a result of it work's geological structure is changeable; therefore its power drive organization must have to strict performance requirement. The power of STM is large, but the space it can provide to install a power source is relatively small.So STM need the power device have advantages of big power, small size and high reliability. Planetary gear reducer is fully equipped with the above-mentioned advantages, able to meet the job requirements of STM. The reducer gear is the power transmission installment of STM, which is the connection between the hubs. Reducers are not only plays the role of transfer movement and power, but also withstand impact of the load bearing in the case of an emergency braking situation. The specificity of conditions and characteristics of installation requirements demand reducer having large transmission power, a small size and high reliability conditions. At present, the design of this special gear reducer is still in early stage. Therefore, reliability assessment and parameter optimization design of the 3-stage planetary gear reducer become one of the great urgent tasks. This paper optimizes and improves the whole transmission program of this 3-stage planetary gear reducer. Details are as follows:Single-objective fuzzy reliability optimization design of 3-stage planetary gear driving is implemented by applying fuzzy reliability design method which combining conversional reliability design methods and fuzzy mathematics to the design of gear. Design process include: the establishment of optimization model of the practical problems, which deals with reliability target and fuzzy factors as constraints; conversing these constraints into general constraints, that is, transforming fuzzy reliability optimization to general optimization problems through establishing two-level and more comprehensive evaluation; solving the optimal design by use of Matlab Optimization Toolbox.Through analysis of strength and stiffness of all levels planetary carrier by use of ANSYS-WORKBENCH software, improve the irrational structure to meet the work requirements of the strength and stiffness. Through applying APDL language of ANSYS establishes command stream of the third-level planetary carrier model, and analyzes its reliability by use of probability design technology based on finite element .Analyzes the impact of materials size of its structure and load for its reliability, and so that provides the basis to ensure the reliability of the planetary carrier.This paper introduced the basic principle of rigid body system dynamics,and eestablished three-dimensional model of the third-level planetary body using Pro/E, and analyzes dynamics of this planetary body based on ADAMS. We described in detail in the course of ADAMS analysis the relationship between components. What's more this paper also verifies the body's transmission ratio, and analyzes the changes of gear mesh forces. |
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