Research

Rescue Robot Bracelet infiltration system

Rescue robot bracelet is a small robot designed for rescue operations. They turn into several small independent robots and shuttle back and forth in the disaster area searching for the wounded.The wrist band will be disengaged when an emergency occurs. As soon as wounded are found the small separated robot will attach, adsorb blood on the wound as a hostasis Band-Aid while sending radio signals for further help.
Many people become trapped in the aftermath of the earthquake. The wrist band will be engaged by the rescue workers. It can then find trapped wondered by using infrared radiation. Furthermore once a wounded individual is found, it will attached any wounded to end blood loss. Subsequently, it will send out a SOS signal to the rescue workers. The final results is that wounded can be rescued with the help of RRB.

 

Bio-inspired robot

Fishes, beetles and cockroaches are agile and resilient. They swim, run, turn or stop rapidly. These living things have inspired the field of soft machines or soft robots. Existing soft robots, however, are typically clumsy or fragile. We investigated the fabrication and actuation of insect-scale robot and ray-like robot. The insect-scale robot achieves a speed of more than 2.0 body lengths per second. It can carry a payload four times its own weight. It survives a compressive force more than 1kN, a deformation over 200%. The autonomous ray-like robot achieves a speed of 1.5 body lengths per second which is faster than any other soft robotic fishes. The robot can also operate in complex, and possibly hazardous, environments.

 

Thermo-responding hydrogel structuresresearchhy001

Inspired by natural plants, thermo-responding hydrogel structures have been designed to trigger mechanical instability with fast actuation. To
ugh Ca-alginate/poly(N-isopropylacrylamide) (PNIPAM) hydrogel has been synthesized by the hybrid of physically crosslinked alginate and covalently crosslinked PNIPAM. The tough Ca-alginate/ PNIPAM hydrogel exhibits 30KPa of elastic modulus, 280J/m2 of fracture energies and 5-folds of uniaxial stretch. A multi-layered structure made of (Ca-alginate/PNIPAM)/(Ca-alginate/poly(acrylamide)) hydrogels demonstrate fast actuation induced by mechanical instability. A finite element simulation model is developed to investigate the deformation and to guide the structural design of the hydrogels. The instability-triggering mechanism can enhance the actuation performances of hydrogel structures in applications such as drug delivery, micro fluid control system and soft biomimetic robotics.

 

(a-i) Actuation motion of snap-through hydrogel structure. (j) Analysis of Snap-through motion.

 

Giant voltage-induced deformation in dielectric elastomers

Dielectric elastomers are capable of large voltage-induced deformation, but achieving such large deformation in practice has been a major challenge due to electromechanical instability and electric breakdown. The complex nonlinear behavior suggests an important opportunity: electromechanical instability can be harnessed to achieve giant voltage-induced deformation. We introduce the following principle of operation: place a dielectric elastomer near the verge of snap-through instability, trigger the instability with voltage, and bend the snap-through path to avert electric breakdown. We demonstrate this principle of operation with a commonly used experimental setup—a dielectric membrane mounted on a chamber of air. The behavior of the membrane can be changed dramatically by varying parameters such as the initial pressure in the chamber, the volume of the chamber, and the prestretch of the membrane. We use a computational model to analyze inhomogeneous deformation and map out bifurcation diagrams to guide the experiment. With suitable values of the parameters, we obtain giant voltage-induced expansion of area by 1692%, far beyond the largest value reported in the literature.

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