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This paper presents a new concept for a travel aid for the blind. A prototype device, called the NavBelt, was developed to test this concept. The device can be used as a primary or secondary aid, and consists of a portable computer, ultrasonic sensors, and stereophonic headphones. The computer applies navigation and obstacle avoidance technologies that were(More)
A blind traveler walking through an unfamiliar environment, and a mobile robot navigating through a cluttered environment have an important feature in common: both have the kinematic ability to perform the motion, but are depended on a sensory system to detect and avoid obstacles. This paper describes the use of a mobile robot obstacle avoidance system as a(More)
This paper presents an immobilization-based control method for spider-like robots that move quasistatically in tunnel environments. The control method is based on an immobilization theory which ensures that when a spider-like mechanism is bracing against the environment at an immobile posture, the naturally occurring compliance at the contacts stabilizes(More)
This paper presents a novel design of a mobile underconstrained cable suspended robot. The paper deals with the kinematics, statics, motion planning and the design of an underconstrained cable suspended robot. The robot consists of four cable mechanisms and a central body. Each cable mechanism includes a thin cable with a simple gripper at the end, and a(More)
Crosstalk is a common problem occurring with arrays of multiple ultrasonic sensors (sonars) in obstacle detection and avoidance systems. This paper presents a novel method that might allow the use of data generated by crosstalk to generate more reliable and accurate object detection. This is accomplished by assigning a unique code to the signals emitted by(More)
A blind traveler walking through an unfamiliar environment, and a mobile robot navigating through a cluttered environment have an important feature in common: both have the kinematic ability to perform the motion, but are depended on a sensory system to detect and avoid obstacles. This paper describes the use of a mobile robot obstacle avoidance system as a(More)
This paper presents a novel design for a mobile robot based on the kinematics of parallel mechanisms. The robot consists of 3 legs, each equipped with an asynchronous driving unit. The legs are connected to the driving units with spherical joints and to the upper plate with a revolute joint. Three additional encoders, attached to the upper revolute joints(More)
This paper considers grasps and fixtures whose contacts react according to force-displacement laws consistent with friction constrains at the contacts. The passive force closure set of such grasps and fixtures is the set of external wrenches (forces and torques) that can act on the grasped object and be stably balanced by the contacts. An external wrench(More)
This paper presents a method for measuring the relative position and orientation between two mobile robots using a dual binaural ultrasonic sensor system. Each robot is equipped with a sonar transmitter that sends signals to two receivers mounted on the other robot. It is assumed (but not implemented in our tests) that the two robots can synchronize events(More)