Control of flow of bobbins and dynamic scheduling in multi-stage production of wire ropes | |
| Author | Pisal Yenradee |
| Call Number | AIT Thesis no. IE-88-27 |
| Subject(s) | Wire-rope industry Scheduling (Management) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Wire rope production is multi-stage production including producing wire and assembling them. The work-in-process is stored on bobbins and the number of bobbins is limited. Therefore, if the production policy is not appropriate, production delay due to bobbin shortage and scheduling difficulty will be occurred. As a result, the company could utilize only 20 - 30 % of its capacity. The author developed the policies for control the flow of bobbins and dynamic scheduling rule to solve the problem. The policies is stated as follows. For stranding operation which is the bottle-neck operation, the operation is operated continuously to reduce setup and priority for scheduling stranding operation is give n to the job which has the longest expected flow time (total stranding time + expected additional time) . For closing operation, priority for scheduling closing operation is given to the work-in-process from the source that gives the highest feed back rate of bobbin in order to avoid the problem of bobbins s hortage . Simulation is performed based on these policies, bobbin availability, machines breakdown information, and production plan of the two month ' s order. The simulation results are the expected flow time of all jobs within two month's order. From simulation results, regression analysis is used to determine the expected additional time as a function of total stranding time. The expected additional time is fed back to the priority dispatching rule to determine the new priority for scheduling the stranding operation. Results are discussed and some recommendations are given for further study. |
| Year | 1988 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Industrial Engineering (IE) |
| Chairperson(s) | Oudheusden, Dirk L. van ;Awate, Prakash G. |
| Examination Committee(s) | Tabucanon, Mario T. |
| Scholarship Donor(s) | The Government of Germany |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |