Speed Design of Lift-Up Mechanism in a Welfare Vehicle

Abstract:

This investigation studies the speed design of lift-up mechanism in a welfare vehicle that lowers and raises a seat from the side door of the vehicle. The seat functions like a wheelchair as it is landed to the ground. A parallelogram configuration is adopted in the mechanism design. A parallelogram linkage, in which a link rod is shaped as a cam, governs the motion of the mechanism. The cam pair mechanism, like a motion-generator cam, determines the motion to expand the lift-up mechanism. The system is kinematically analyzed. The constraint relations, velocity equations, and acceleration equations of the mechanism are obtained. The kinematic characteristics of the lift-up mechanism are investigated, which gives the guidance to design the speed of the system. The speed of the lift-up mechanism is investigated, in which the method of linear function with parabolic blends for a path with via-points is adopted in the trajectory planning.

• Periodical: Applied Mechanics and Materials (Volumes 284-287)
• Pages: 944-949
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.284-287.944
• Online since: January 2013
• Authors: Der An Wang
• Keywords: Cam Pair Configuration, Lift-up Mechanism, Trajectory Planning

References

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