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Shield Propelling Mechanism Dynamic Analysis and Research

Author: YuanYongSheng
Tutor: XuYouNan
School: East China Jiaotong University
Course: Mechanical Design and Theory
Keywords: Shield Dynamics Stiffness Statics Modal Vibration response
CLC: U455.39
Type: Master's thesis
Year: 2011
Downloads: 69
Quote: 0
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Abstract


Shield tunneling machine is a set of electrical , hydraulic , measurement -oriented , control , materials multidisciplinary technology the dedicated tunnel project in one of the large-scale high-tech construction equipment , correct control of the propulsion system is to ensure that the correct tunneling shield along the design line premise. Propulsion system installation in hydraulic cylinders typically will advance hydraulic cylinder with shield body parallel installation , but the shield around the earth pressure , stress , the shield driving posture control error . In this paper, a 2 × 6-SPS Shield promote the institutions for the study , combined with parallel kinematics , dynamics theory , mainly in the following aspects : 1 . Elaborate research background and significance , review and abroad shield Frame the course of development of the technology and the shield tunneling machine , research status and proposed main content . Promote the organization 's structure size design, and the establishment of the institution of the three-dimensional model , the use of parallel kinematics theory to study the position of the propulsion mechanism , the general expression of the various components of speed and acceleration , static stiffness propulsion mechanism , dynamic analysis has laid a theoretical foundation . Shield entities hydraulic cylinder for the study , the theoretical analysis of the static stiffness model , hydraulic cylinders and promoting organization ; ANSYS software focuses on the static stiffness of the contact problem of the hydraulic cylinder , to consider the joint , the deformation of the hydraulic oil . draw ball hinge under the influence of the contact deformation , the stiffness of the stress is linearly proportional relationship . Based on generalized coordinate form of Newton - Euler method to study the various components of the stress analysis and single component Newton - Euler equations , based on the principle of virtual work , eliminating the ideal hinge system dynamics equations constraint forces system dynamics equations corresponding to the generalized coordinates . 5 based on ANSYS modal analysis , research hydraulic cylinder and the resonance frequency of the promoting organization and modes , come to the the advance mechanism unstable vibration frequency and vibration may occur lapsed advance mechanism ; ADAMS dynamics analysis software outer excitation of the vibration response of the hydraulic cylinder .

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