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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...
A power assist robot system reduces the weight of an object lifted with it. However, the root causes of the reduced heaviness as well as the factors affecting the heaviness are still unknown. The knowledge on the root causes and factors could be used to modulate the interactions between the human user and the robot when lifting objects with it. This paper investigated the reasons and factors behind...
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...
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