The workspace and load bearing involved in a given operation are the deciding criteria for choosing the size and type of the manipulator that has to be used. The hybrid manipulator, which is a serial manipulator mounted on top of a parallel manipulator, derives benefits from both, such as better rigidity from the parallel manipulator and better dexterity from the serial manipulator. In this paper, comparative study of workspace and effectiveness of a hybrid manipulator is done to bring out its advantages, in comparison to a parallel or a serial manipulator. The workspace is determined using geometrical techniques. The effect of having inclined links and its impact on the load bearing capacity of the manipulator is also studied. Serial manipulators on top of mobile robots are used in nuclear power plants to replace spent fuel rod. The serial manipulators have lesser load bearing capacity than hybrid manipulators. By, using a hybrid manipulator, the load bearing capacity is improved.
The main objective of this paper is to design and develop an assistive leg for the paralyzed patients, which supports them, by changing their paralyzed gait pattern to normal gait pattern. The normal gait pattern is achieved by reflex action. Two angle measurement sensors are mounted in the normal leg and two servo motors are mounted in the paralytic leg-at the hip and ankle. The principle is that as the person takes a step in his normal leg, the sensors detect the amount of leg movement and sent the data to microcontroller. Then the servo motors in the paralytic leg are actuated based on the commands from the microcontroller depending on the type of gait suitable for the person. It is observed in such patients that they follow three kinds of gait. Depending on the amount of normal leg movement the gait pattern is decided and the servo motors rotate to move the paralytic leg. During all these, the person still takes the help from the walking aid.
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