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Articles by Victor Amirtham
Total Records ( 3 ) for Victor Amirtham
  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.
  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.
  Abdul Malik Bin Surdi Roslan , Victor Amirtham , T. Nagarajan and Fakhruldin Mohd Hashim
  This research is a study of using a Shape Memory Alloy (SMA) as an actuator in a robotic application for a 6 Degrees of Freedom (DOF) Stewart Platform. Conventional actuators such as hydraulics, pneumatics and mechanical will be replaced by a new breed of technological advancement of SMA wires. The focused area of study is on a mini sized Stewart Platform which eliminates bulky conventional actuators. Hence, SMA will have the distinctive advantages over the other types of actuators. The mini Stewart Platform consists of a fixed base and a platform connected with specially designed SMA actuators along with a counter force spring. The support post for the platform uses a counter force spring material viz. sponges. Further study includes the design of a Pulse Width Modulation (PWM) technique power supply circuit for the controlling the current to increase the temperature of the heat sensitive wires. For the SMA wires, the cooling system serves as an important role to ensure the wires return back to its original length without any damage after they had been stretched out. Kinematic studies have been carried out to achieve required displacements of the platform.
 
 
 
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