HE Qizhen,ZHANG Haifeng,CHEN Qiaohong,et al. Dynamics analysis of the 3-[P(RR-RRR)SR] kinematically redundant parallel mechanism[J]. Journal of Mechanical Transmission,2025,49(3):24-32.
HE Qizhen,ZHANG Haifeng,CHEN Qiaohong,et al. Dynamics analysis of the 3-[P(RR-RRR)SR] kinematically redundant parallel mechanism[J]. Journal of Mechanical Transmission,2025,49(3):24-32. DOI: 10.16578/j.issn.1004.2539.2025.03.004.
Dynamics analysis of the 3-[P(RR-RRR)SR] kinematically redundant parallel mechanism
kinematic redundant parallel mechanisms offer advantages such as a larger orientation workspace and the ability to avoid singular configurations. However
their degree of mobility (
L
) is greater than the number of degrees of freedom (
n
) of the end effector
which results in an excessive number of rigid bodies and makes dynamic modeling more difficult. Therefore
a dyn
amic modeling method based on the principle of virtual work was proposed for the 3-[P(RR-RRR)SR
]
kinematic redundant parallel mechanism
further simplifying the modeling process.
Methods
2
Firstly
generalized variables were selected in the high-dimensional generalized space corresponding to the degree of mobility (
L
) of the mechanism. The kinematic transfer relations between the velocity and acceleration of each component within the mechanism and the system output velocity and acceleration were derived
and the Jacobian matrices of each component and the generalized variable were solved. Then
the dynamic model of the parallel mechanism was established using the principle of virtual work. Finally
the model was simulated by tracking the quintic polynomial trajectory of the end effector and compared with the calculation results of Adams software.
Results
2
The analysis results indicate that the maximum relative error between the theoretical and simulated values of the driving force/torque at each joint is only 1.58%. This demonstrates the accuracy and reliability of the model
and also suggests that this method can provide reference for in-depth analysis of the dynamic characteristics of the mechanism and research on control strategies.
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