SEMINAR ON1)SCHEDULING

2)KNOWLEDGE BASED SCHEDULING3)COMPUTER HIERARCHY CONTROL

4)SUPERVISORY CONTROL

PRESENTED BY:

AKSHAY WADALKAR

ROLL NO. 02

SCHEDULING

• Scheduling is an important tool or manufacturing and engineering, where it can have a major impact on the productivity of a process.

• Scheduling relates to the timing of each individual delivery.

• It mainly deals with handling application.• It increases efficiency of production.• Scheduling decreases material handling cost and

waiting time for work in process.

SCHEDULING

• It co-ordinate man, machine and production facility for obtaining higher output.

• It uses graphical data plotted by taking readings to identify the errors in process

• Corrective actions are taken and manufacturing lead time is minimized

• Scheduling is the study of process and organizing them to obtain higher effficiency

Advantages of Scheduling

• Process change-over reduction• Inventory reduction, leveling• Reduced scheduling effort• Increased production efficiency• Labor load leveling• Accurate delivery date quotes• Real time information

KNOWLEDGE BASED SCHEDULING

• A general knowledge-based system consists of three components:

– a database

– a knowledge base

– an inference engine

• The database stores declarative knowledge about the goals, the current situation of the world, and the semi finished plan.

• The knowledge-base stores the domain-specific and procedural knowledge, often represented by production rules or operators.

• the inference engine stores control knowledge indicating how to select operators and when to apply them.

KNOWLEDGE-BASED SCHEDULER CAN PERFORM THE FOLLOWING TYPES OF

SCHEDULING FUNCTIONS:1. Adaptive scheduling: Schedules are

generated by goal-driven procedures; the scheduler can perform dynamic scheduling to adapt to changes in the FMS environment.

2. Planning: State-space inference and heuristic search are used to derive production processes.

3. Optimizing: Simulation and selection of plans from alternates are done by evaluating performance criteria and heuristics.

4. Learning: Recognition, refinement, encoding, and integration of processes are performed to enhance the scheduling performance.

COMPUTER HIERARCHY CONTROL

• The term computer hierarchy control is used to describe such configuration which consist of following components.

– Multiple process control station located throughout the plant to control the individual loop and device of the process.

– A certain control room equipped with the operator stations where supervisory control of plant occurs

– All process and operator stations interact with each other by means of communication network.

SUPERVISORY CONTROL

• The term supervisory control is usually associated with the process industries, but the concept applies equally well to discrete manufacturing automation.

• Supervisory control represent a higher level of control than DDC, NC & PLCs.

• Supervisory control denotes a control system that manage the activities of a number of integrated units operations to achieve certain economic objectives for the process.

• Supervisory control is not much more than regulatory control or feed forward control.

• In other application the supervisory control system is designed to implement optimal or adaptive control.

• Supervisory control can be defined as the control system that directs and co-ordinates the activities of several interacting pieces of equipment in manufacturing cell or system.

REFFERENCES

• “AUTOMATION IN PRODUCTION SYSTEM” by Mikell P. Grover

• “COMPUTER INTEGRATED MANUFACTURING” by N. Venkateshwaran

• “Knowledge based Scheduling in FMS” by Michael J. Shaw.

• http://production-scheduling.com/

THANK YOU