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Flexible Multibody Dynamic Analysis of the Heavy Load Forging Manipulator Based on SIMPACK

Author: HanYaZuo
Tutor: LiGang
School: Dalian University of Technology
Course: Engineering Mechanics
Keywords: Overloaded operators machine Flexible dynamics Floating coordinate system Modal set Hydraulic stiffness
CLC: O313
Type: Master's thesis
Year: 2010
Downloads: 235
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Abstract


With the development of the operating machine direction of large, heavy-duty, directly related to the safe operation of the machine operation problems have become increasingly prominent. Statics and local dynamics based institutions and structural design and optimization can no longer meet the requirements. Flexible dynamic behavior of the whole operating under different operating conditions of the machine in this study, as part of the fatigue analysis, life expectancy and structural optimization, as well as the whole of the institutions designed to provide a more scientific basis. For flexible component of the mechanical system, usually defined a floating coordinate system to describe the movement as a whole, the member with respect to the coordinate system must be as small deformation. For conventional flexible dynamics analysis, the elastic displacement of the object approximation member elastic modal a linear combination of these elastic mode is generally selected member of the main mode set. Machine for heavy duty operation, due to the extreme loads, as the elastic deformation of the substrate is not truly describe the parts just select the main modal deformation. This article describes a flexible object dynamics analysis objects floating coordinate system selection principle, in order to protect the small deformation effect of the object. Under elastic objects floating coordinate system and then describes the main modes and constraint modes as overloaded manipulator rigid-flexible coupling kinetic analysis of the modal base. Furthermore, the use of JOURDAIN virtual power principle detailed derivation of the flexible coupling dynamics analysis of virtual power equation and differential control equations of multi-body dynamics analysis. In addition, the overloaded operator machine parallel control system with multiple redundant agencies, the operation of the different forms of exercise machine by complex hydraulic circuit. For the hydraulic control system, using MATLAB SIMULINK modeling requirements for the control strategy is very high, and the computational efficiency will be very low. In order to improve the computational efficiency, derived by the traffic law of conservation of the Bernoulli equation the hydraulic equivalent nonlinear stiffness. Furthermore, nonlinear stiffness, damping, and fluid pressure instead of hydraulic control role. Finally, in the UG environment to establish the overall geometry of the overloaded operator model. Based on MATLAB, the preparation of the the operating machine beams shaped component modal analysis procedures, operating machines equivalent hydraulic nonlinear stiffness interface program and analysis of the state of the initial moments of the object program. Components for complex spatial entities, the entire CAD model is imported into ANSYS modal analysis in ANSYS. All calculations into SIMPACK, and analyzed operating under different operating conditions of the machine flexible coupling dynamics effects in SMPACK.

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CLC: > Mathematical sciences and chemical > Mechanics > Theoretical Mechanics ( general mechanics ) > Dynamics
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