Abstract
The present research on moulded case circuit breaker(MCCB) focuses on the enhancement of current-limiting interrupting performance during short circuit, overload, under voltage and phase failure, involving electrics, magnetic, mechanics, thermal, material, friction, arc extinguishing, impact vibration, skin effect, etc. The rigid-flexible coupling of the parts and components of the metamorphic manipulating mechanism in multi-fields leads to the non-rigid, high frequency, high damping, singularity of the Euler-Lagrange equations which represents the multi-body dynamics. The small step iteration which is used for obtaining the instantaneous and short time critical interrupting performance of metamorphic mechanism appears inaccuracy. It is difficult to realize top-down design by existing CAD systems. Therefore, a metamorphic manipulating mechanism design method for MCCB using index reduced iteration(IRI) is put forward. The metamorphic manipulating mechanism of MCCB is decomposed into three mechanisms: main switch connector mechanism, electromagnet-drawbar-jump buckle mechanism, and bimetallic strip-drawbar mechanism, which is respectively described by electro-dynamic force, electromagnet force, and bimetallic strip force. The dummy part(virtual rigid) without moment of inertia and mass is employed as intermediate to join the flexible body and rigid body. The model of rigid-flexible coupling metamorphic mechanism multi-body dynamics is built. The differential algebraic equations(DAEs) of the multibody dynamics model are converted to pure ordinary differential equations(ODEs) by coordinate partition. Order reduced integration with multi-step and variable step-size is preceded based on IRI. The non-linear algebraic equations are solved in each integration step by Newton-Rapson iteration. There is no ill-condition and singularity of Jacobian matrix when step size reduces to zero. The independent prototype design system using ACIS R13, HOOPS V11.0 and Visual C++.NET 2003 has been developed, which verifies the effectiveness of the proposed method. The proposed method enhances the current-limiting interrupting performance of MCCB, and has reference significance for multi-body dynamics design for similar flexible metamorphic mechanisms in multi-fields.
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This project is supported by National Basic Research Program of China (973 Program, Grant No. 2011CB706506), National S&T Great Special of China(Grant Nos. 2012ZX04010011, 2011ZX04014-131), National Science Foundation for Young Scholars of China(Grant No. 51005204), and Postdoctoral Fund of China(Grant No. 20100471000)
XU Jinghua, born in 1979, is currently an assistant researcher at Zhejiang University, China. He received his PhD degree from Zhejiang University, China, in 2009. His research interests include digital mockup(DMU)
ZHANG Shuyou, born in 1963, is currently a professor and a PhD supervisor at Zhejiang University, China. He received his PhD degree from Zhejiang University, China, in 1999. His research interests include computer graphics, CAD, virtual reality and manufacturing information
ZHAO Zhen, born in 1983, received his PhD degree from Zhejiang University, China, in 2012. His research interests include multi-body dynamics.
LIN Xiaoxia, born in 1982, received his PhD degree from Zhejiang University, China, in 2011. His research interests include CAE.
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Xu, J., Zhang, S., Zhao, Z. et al. Metamorphic manipulating mechanism design for MCCB using index reduced iteration. Chin. J. Mech. Eng. 26, 232–241 (2013). https://doi.org/10.3901/CJME.2013.02.232
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DOI: https://doi.org/10.3901/CJME.2013.02.232