集成制造系统网络的绩效管理[文献翻译].doc

原文:
Performance Management of
Integrated Manufacturing works
Suk Lee,Asok Ray,Keum shik Hong,Joongsun Yoon,
and Myung Chu Han
of the Performance Management Procedure
Network performance, more specifically delays experienced by message packets, could be critical for dynamic performance and stability of realtime manufacturing processes. This is especially true when multiple machines are performing a task without direct connections among them. One of the <examples is an intelligent welding system (Nayak, Ray and Vavreck, 1987) where a positioning table and a robot have municate through work to exchange the desired table position coordinates and various messages for status report. Another example is manipulation
of a bulky and flexible workpiece by more than one independent robots which initiate their own prescribed trajectories upon receiving a signal from a controller and report pletion of the trajectories back to the controller via work. The timeliness of the transmitted data is essential because a delay could damage the workpiece or the robot's wrists and arms.
In order to maintain an acceptable level of the dynamic performance and stability of various processes, performance management is required to manipulate adjustable protocol parameters in real time so that work can adapt itself to the dynamic environment. This can be plished in two steps: (I) performance evaluation to find how perturbations in protocol parameters affect a selected performance measure, ., to determine the relationship between the performance measure and the protocol parameters; (2) decision making to decide on how to adjust protocol parameters, ., to identify the direction and magnitude of the parameter adjustment vector, utilizing pieces of information provided in the first step and the history of
performance.
The analytical techniques for performance evaluation such as queueing theory (Viswanadham and Narahari, 1992) often requires unrealistic assu