Massless links with external forces and bushing effect for multibody dynamic analysis |
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Authors: | Jeong-Hyun Sohn Wan-Suk Yoo Keum-Shik Hong Kwang-Suk Kim |
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Affiliation: | (1) Graduate school, Pusan National University, 609-735 Pusan, Korea;(2) School of Mechanical Engineering, Pusan National University, 609-735 Pusan, Korea;(3) Department of Automobile Engineering, Inha Technical College, Inchon;(4) Department of Mechanical Enginerring, Pusan National University, Jangjun-dong, Keumjung-ku, 609-735 Pusan, Korea |
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Abstract: | When the contribution of lightweight components to the total energy of a system is small, the inertia effects are sometimes
ignored by replacing them to massless links. For example, a revolute-spherical massless link generates two kinematic constraint
equations between adjacent bodies and allows four relative degrees of freedom. In this paper, to implement a massless link
systematically in a computer program using the velocity transformation technique, the velocity transformation matrix of massless
links is derived and numerically implemented. The velocity transformation matrix for a revolute-spherical massless link and
a revolute-universal massless link are appeared as a 6X4 matrix and a 6X3 matrix, respectively. A massless link model in a
suspension composite joint transmitting external forces is also developed and the numerical efficiency of the proposed model
is compared to a conventional multibody model. For a massless link transmitting external forces, forces acting on links are
resolved and transmitted to the attached points with a quasi-static assumption. Numerical examples are presented to verify
the formulation. |
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Keywords: | Multi-body Dynamics Massless Link Velocity Transformation Technique Simulation |
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