DOI: 10.3390/s23249817 ISSN: 1424-8220
A Pneumatic Particle-Blocking Variable-Stiffness Actuator
He Peng, Xia Wang, Dexu Geng, Wenzhi Xu- Electrical and Electronic Engineering
- Biochemistry
- Instrumentation
- Atomic and Molecular Physics, and Optics
- Analytical Chemistry
In order to improve the stiffness of flexible robots, this paper proposes a variable-stiffness elastic actuator. The actuator integrates the working principles of a pneumatic drive, wedge structure, and particle blockage. The anti-tensile stiffness of the actuator is nonlinearly negatively correlated with the air pressure because of the structural and material properties. The anti-compressive stiffness and lateral stiffness increase nonlinearly as air pressure increases, being 3 and 121 times greater at 0.17 MPa compared to 0 MPa, respectively. Beyond 0.17 MPa, the two stiffnesses of the actuator experience incremental growth due to wedge resistance forces.