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A one degree-of-freedom (vertical up-down) power assist robot was developed for lifting objects. The robot was simulated and six subjects independently lifted objects of three different sizes with the robot. In each trial, the subject used his two hands synchronously to lift the object with the robot and estimated the perceived weight of the lifted object by comparing it to a reference weight. We...
We conducted two experiments. In the first experiment, we made two objects with identical appearance. One was lifted by humans in constrained condition, another was lifted in unconstrained condition, and human's weight perception was compared between the two conditions. The results showed that weight perception for constrained lifting of objects was not too much different from that for unconstrained...
When a human manipulates an object with a power assist robot, the human feels a scaled-down effect of the load and the forces required to manipulate the object also reduce. We determined in our previous research that the power assist robot reduces the weight of the lifted object to 40% of its actual weight. However, the root cause of reduced heaviness of objects manipulated with power assist robots...
A power assist system reduces the weight of an object lifted with it. But, the human operator cannot differentiate between the perceived weight and the actual weight and eventually applies excessive load force. This faulty force programming (excessive load force) results in faulty motions of the power assist system and jeopardizes its maneuverability, ease of use, naturalness, human-friendliness,...
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