Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Performance Improvement of Pneumatic Artificial Muscle Manipulators Using Magneto-Rheological Brake

  • Ahn, Kyoung-Kwan (School of Mechanical and Automotive Engineering, University of Ulsan) ;
  • Cong Thanh, TU Diep (Graduate School of Mechanical and Automotive Engineering, University of Ulsan) ;
  • Ahn, Young-Kong (Research Center for Machine Parts and Material Processing, University of Ulsan)
  • Published : 2005.03.01
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Abstract

A novel pneumatic artificial muscle actuator (PAM actuator), which has achieved increased popularity to provide the advantages such as high strength and high power/weight ratio, low cost, compactness, ease of maintenance, cleanliness, readily available and cheap power source, inherent safety and mobility assistance to humans performing tasks, has been regarded during the recent decades as an interesting alternative to hydraulic and electric actuators. However, some limitations still exist, such as the air compressibility and the lack of damping ability of the actuator bring the dynamic delay of the pressure response and cause the oscillatory motion. Then it is not easy to realize the performance of transient response of pneumatic artificial muscle manipulator (PAM manipulator) due to the changes in the external inertia load with high speed. In order to realize satisfactory control performance, a variable damper-Magneto­Rheological Brake (MRB), is equipped to the joint of the manipulator. Superb mixture of conventional PID controller and a phase plane switching control method brings us a novel controller. This proposed controller is appropriate for a kind of plants with nonlinearity, uncertainties and disturbances. The experiments were carried out in practical PAM manipulator and the effectiveness of the proposed control algorithm was demonstrated through experiments, which had proved that the stability of the manipulator can be improved greatly in a high gain control by using MRB with phase plane switching control method and without regard for the changes of external inertia loads.

Keywords

References

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