Previously, we reported an undersea unmanned vehicle (UUV) termed as JetSum, inspired by the locomotion of medusa jellyfish, [12]. The propulsion of JetSum was based on shape memory alloy (SMA) wires replicating the contraction-relaxation cycle of natural jellyfish locomotion. In this paper, we report modified design of JetSum that addresses problems related to electrical isolation and power consumption. The modifications lead to significant improvement in functionality, providing implementation of a full continuous bell, bolstering critical sealing junctions, and reducing the overall power requirement. A LabVIEW controller program was developed to automate and optimize the driving of JetSum enabling reduction in power consumption for full contraction of SMA. JetSum locomotion in underwater conditions was recorded by using a high-speed camera and analyzed with image processing techniques developed in MatLab. The results show that JetSum was able to achieve velocity of 7 cm/s with power consumption of 8.94 W per cycle.
[1]
Sung-Weon Yeom,et al.
A biomimetic jellyfish robot based on ionic polymer metal composite actuators
,
2009
.
[2]
S. Priya,et al.
A bio-inspired shape memory alloy composite (BISMAC) actuator
,
2010
.
[3]
Shuxiang Guo,et al.
A New Type of Jellyfish-Like Microrobot
,
2007,
2007 IEEE International Conference on Integration Technology.
[4]
Noel E. Sharkey,et al.
Death strikes from the sky: the calculus of proportionality
,
2009,
IEEE Technology and Society Magazine.
[5]
Sean P Colin,et al.
Morphology, swimming performance and propulsive mode of six co-occurring hydromedusae.
,
2002,
The Journal of experimental biology.