In this paper, a combination of nonlinear gain and proportional integral derivative (NPID) controller was proposed to the trajectory tracking of a pneumatic positioning system. The nonlinear gain was employed to this technique in order to avoid overshoot when a relatively large gain is used to produce a fast response. This nonlinear gain can vary automatically either by increasing or decreasing depending on the error generated at each instant. Mathematical model of a pneumatic actuator plant was obtained by using system identification based on input and output of open-loop experimental data. An autoregressive moving average with exogenous (ARMAX) model was used as a model structure of the system. The results of simulation and experimental tests conducted for pneumatic system with different kind of input namely step, sinusoidal, trapezoidal and random waveforms were applied to evaluate the performance of the proposed technique. The results reveal that the proposed controller is better than conventional PID controller in terms of robust performance as well as show an improvement in its accuracy.
This paper presents applications of novel soft actuator design; a combination of different braided angles of artificial muscle actuator in biomimetic locomotion. The actuator construction is based on the integration of artificial muscle contraction and extension theory. The actuator comprises of fiber-reinforced inside silicone rubber and is capable to create extension, contraction and one-sided bending motion. Based on the experimental results, the developed soft actuator can realize leech, swimming-frog and inchworm-like locomotion behavior after standard air pressure driving experiment is executed.
This paper presents the intrinsic muscles of a Human-like Robotic Hand (HR-Hand), with a focus on dorsal interossei and palmar interossei muscles. Three links of palmar and four links of dorsal interossei muscles were fabricated according to human hand anatomy using 1.3 mm thin McKibben actuators. The experimental result using single index finger shows that the robotic hand could achieve palmar adduction and dorsal abduction and assist in flexion of fingers that imitate the actual function in the human hand.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.