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Articles by S. Krishnan
Total Records ( 2 ) for S. Krishnan
  Victor Amirtham , T. Nagarajan , S. Krishnan and Fakhruldin Mohd Hashim
  The research addresses alternate method of actuating a pseudo wrist motion intending to replicate a human supination/pronation motion. The actuation implemented was using a Shape Memory Alloy (SMA) wire as mimicry for a muscular action located within the boundary of the human forearm. Replacing the bone and other muscular structure which act as torsional resilience is the rigid Polyvinyl Chloride (PVC) Split-Tube Flexures. The design of the actuation method was experimented and simulated under laboratory conditions. A fixed size SMA wire was used throughout the experiment. The results gave an insight working of the split-tube flexures under linear angled forces and the behavior of SMA wires under different strain conditions. The study concluded that with use of SMA linear actuation, an angular motion could be achieved. Furthermore the research concludes that split tube flexures can be used as torsional resilience as to be able to return to the initial position, thus removing complex mechanisms.
  T. Nagarajan , S. Krishnan , Victor Amirtham , Ahmad Majdi Abdul-Raniand and T.V.V.L.N. Rao
  Pneumatic Artificial Muscle (PAM) as an actuator to create pulling force and bulges mimicking a human muscle contraction. Currently, the method used to manufacture the PAMs is by braiding with artificial fibers. Natural fiber braided PAMs are rarely available for the usage in prosthesis. The novel contribution of this project is to design and develop a desirable low cost and lightweight Pneumatic Artificial Muscle (PAM) actuator using different materials. In this study, the studies are conducted to find the effect of various braided materials such as nylon and Natural Fiber (Silk). The analysis is carried out on actuators of having constant longitudinal length of 140 mm varying the diameter namely 20 and 30 mm. The experiment was set up to collect the length and force variation data of the artificial muscle with various compressed air pressures. The force generated by PAM purely depends on the rate of pressure added and removal from the actuator and is contractile in nature upon inflation. PAM actuator find wide applications in various facets of robotic equipments and industrial automation.
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