Abstract
The haptic interface, which has the function to present the force sense, has been proposed in order to let an operator to know the unknowable information. This kind of interface would be efficient as a controller for person of advanced age, because their five senses tend to be weak than younger people. Some information obtained by the sensor fusion are presented to the operator through the control rod as the force making up for the unknowable information. The amount of force should be concerned not to occur the contradiction for the operators, in order to give them the good fitness. In this report, some psychological experiments were described to adjust the amount of force to be present.
