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The evaluation method of workability on remote operation systems through a communication network is discusses in order to understand the effectiveness of task-based data exchange. On the task-based data exchange the more important information according to the contents and conditions of which the robot performs is given transmission for example, by altering the contents of priority for example, by altering the contents of the transmitted data. An experimental system have been built in which the master arm in Tsukuba and the slave arm in Kawasaki, separated by about 100 km, are connected through and the standard techniques are utilized, such as N-ISDN, TCP/IP, socket, JPEG, etc. The crank revolution as an example of a constrained motion and the pen as an example of a free motion are adopted. The workability cannot be evaluated by using the working and the working error independently A new index is proposed, which simultaneously considers the working and the working error, and accurately reflects the operator's feeling.