Browsing by Author "Jayawardene, TSS"

Now showing 1 - 4 of 4

item: Thesis-Abstract
Analaysis and simulation of a poly bag manufacturing systems
Gopura, RARC; Jayawardene, TSS
The film blowing plays a major role in manufacturing poly bag products that are indispensable in day-to-day life. Film blowing is largely deployed to manufacture poly bags in a continuous flow. As material prices skyrocket to new heights and forecasters see no end to this trend, any positive contribution in the poly bag manufacturing value chain has a great impact on reducing the manufacturing costs. High density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and polypropylene (PP) are basically used as raw materials for the poly bag manufacturing and subsequently undergo some other processes such as cutting, sealing, printing, quality checking, and packing. Due to the variations of parameters in poly bag manufacturing process with different products, a considerable setting time as conceded and substantial amount of raw material is wasted. Material wastage is high as 10% to 12% in figures. Rather high lead-time, improper line balancing, and improper inventory control mimic serious bottlenecks in the system from performance point of view. With the purpose of identifying the productivity and the efficiency problems of the poly bag manufacturing system, as a preliminary study to simulation, risk analysis, bottle neck analysis, and SWOT analysis were carried out in poly bag manufacturing system. Then the possible risk of the selected system was prioritized. In addition, a computer based simulation has been carried out to simulate the system and thereby find the draw backs. The poly bag manufacturing system has been modelled to obtain the optimum production times and throughput time of a given type of bag. Production schedule has been developed for maximum productivity by using the simulated production and throughput times, and customer orders. The effect of changing the parameters of the control process was investigated through simulation trials. A Graphical User Interface (GUI) was developed to present the result of simulation easily and user friendly.
item: Conference-Abstract
Analysis of risks and bottlenecks of a poly bag manufacturing factory - a case study
(2008) Gopura, RARC; Jayawardene, TSS
The material prices of poly bags skyrocket to new heights and forecasters see no end to this trend. Also legal restrictions are imposed on some types of polythene products. In this situation, any entrepreneur engaging in the poly bag manufacturing process faces significant challenges. Therefore, a case study of an analysis of risks and bottlenecks of a poly bag manufacturing factory was carried out for the purpose of modeling and simulation of a poly bag manufacturing factory to improve the productivity to face the underlying challenges. This paper presents the analysis methods, and the results of the analysis are also discussed.
item: Conference-Extended-Abstract
Simulation of a poly-bag manufacturing system
(2009) Gopura, RARC; Jayawardene, TSS; Amarasena, KGAH
Poly bag manufacturing entrepreneurs face many challenges due to frequent fluctuation and continuous increasing trend of material prices of poly bags. Further legal restrictions imposed on some types of polythene products made the situation aggravated. With the purview of optimizing the poly bag manufacturing process, authors attempted model and simulate the poly bag manufacturing process in the light of posed challenges. This paper presents a modeling method and a simulation study of a poly bag manufacturing system.
item: Thesis-Abstract
Simulation support tool for routing of automated guided vehicles
(3/25/2011) Jayawardene, TSS; Indralingam, M; Perera, HSC
Today's vast variety automated industries uses automatic guided vehicles (AGY) to material handling, transportation of work in progress (WIP) and many other purposes. Driverless operation and speed of handling together with the loading capacity make AGYs popularize among industries like newsprint, distribution, warehouse and manufacturing, food and pharmaceutical, apparel and clothing, household appliances. office and computer equipment.// In this report I try to address the automatic guided vehicle simulation in a given bilateral net work avoiding conflicts between AGY s through the shortest distance path in shortest time with the constraints established by the AGY specifications and user de fined dispatching policies. In previous studies emphasis is made only for one or few concerns and it could be collision free routing, shortest distance path, shortest time path, best dispatching policy or anything else. Matching of AGY capacities for demands .consideration of velocity profiles are rarely touched by researchers. because of the consequences in complexity arise with these considerations.// Dynamic approaches in holding data to smart handling of memory resource, extensive implementation of efficient algorithms with lesser time complexity to improve the speed of operation. appropriate scope selection for variables are few of key features used in coding. A complete coding is also provided as a supplementary booklet. In this report, a rational model building for simulation studies is also briefly discussed.