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Reliability Evaluation and Optimization Design of the High Power Reducer Based on Earth Pressure Balance Shield

Author: ChangXing
Tutor: ChenQi
School: Chongqing University
Course: Mechanical Design and Theory
Keywords: Shield machine Planetary reducer Reliability Optimal design
CLC: U455.39
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 0
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Abstract

With the accelerated pace of China's economic development and urban construction, the shield machine has been rapid development in the country. Undercutting a construction method of tunnel shield construction method under the ground, it uses the shield machine tunneling underground to prevent collapse or to maintain the stability of the excavation face in the soft ground excavation face while safely inside the tunnel excavation and lining job, throughout the tunnels molding. Today's rapid economic development, the shield machine of choice for a growing number of construction units to replace the inefficient traditional boring method for tunnel excavation. One of the important parts of the earth pressure balance shield machine reducer drive the cutter operation, it is connected to the side of the hydraulic motor, gear side rotation to drive the cutter spindle, the connection between the hub, not only plays to transmit motion and the role of power, but also in the case of an emergency braking loads shocks. Environment, requiring high reliability, light weight, easy to maintain and economical to use because of its special use of variable load conditions and underground work, however, the localization of the design and manufacture of high-power reducer can not meet these conditions. Therefore, the reliability assessment and parameter optimization study of high-power three planetary gear reducer design has become one of the urgent task to solve today's domestic high-power reducer design and manufacturing problems. Thesis topic by the 863 projects funded, three planetary gear drive system as the research object, system reliability assessment and parameter optimization design study, and provide scientific and reasonable method for the localization of the design and manufacture of high-power reducer theoretical basis. Specific research work in the following areas: reducer system based on FMECA analysis techniques to establish the reliability block diagram and fault tree model diagram, the solving of the system need to be controlled by a first-order minimal cut sets laid a follow-up system reliability assessment foundation; ② gear contact with unit, the bending unit as well as the rolling bearing contact unit reliability analysis, and based reliability prediction and reliability of the distribution system reliability assessment model; ③ based on the reliability analysis, using MATLAB software optimization Toolbox to optimize the design and calculation of parameters to optimize the design of single-stage model, the reliability optimization design of rolling bearings, and reducer tertiary optimized ac cb meshing using ANSYS-WORKBENCH software contact fatigue stress finite element analysis unit; ④ given optimization parameter after the original parameters of various contrast results to prove reliability assessment method proposed in this paper and to optimize the design methodology of science and rationality.

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