To rapidly and efficiently model and analyze the kinematics characteristics of spatial mechanism kinematics
a computer symbols model and a computational method were proposed based on multi-body dynamics theory. The relationship among the Cartesian coordinates which are built on the joints of each link was utilized to describe the configuration of spatial mechanisms. The link shape matrices were obtained from the relationship between the two coordinate systems on the same link. According to the type and property of joints
the joint constrain matrices were obtained from the relationship between the two coordinate systems of the same joint on the two links. Using these transform matrices on the kinematics chains in series
the mathematical model of spatial mechanisms was developed
and the motion equations of spatial mechanisms were derived. The velocity equations and acceleration equations were obtained by the time first derivatives and second derivatives of the motion equations. Accordingly
a general software was developed for analyzing spatial mechanism kinematics. A spatial four bars mechanism was modeled and analyzed by this software
and the correctness of the proposed method and the software were verified.
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references
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