Papers by Rama Bhupal Reddy
Abstract Reactive repair of a disrupted schedule is a better alternative to total rescheduling, ... more Abstract Reactive repair of a disrupted schedule is a better alternative to total rescheduling, as the latter is a time consuming process and also results in shop floor nervousness. The schedule repair heuristics reported in the literature generally address ...
Integrated Manufacturing Systems, 2003
Dispatching rules are usually applied dynamically to schedule jobs in flexible manufacturing syst... more Dispatching rules are usually applied dynamically to schedule jobs in flexible manufacturing systems. Despite their frequent use, one of the drawbacks that they display is that the state the manufacturing system is in dictates the level of performance of the rule. As no rule is better than all the other rules for all system states, it would be highly desirable to know which rule is the most appropriate for each given condition, and to this end this paper proposes a scheduling approach that employs inductive learning and backpropagation neural networks. Using these latter techniques, and by analysing the earlier performance of the system, “scheduling knowledge” is obtained whereby the right dispatching rule at each particular moment can be determined. A module that generates new control attributes is also designed in order to improve the “scheduling knowledge” that is obtained. Simulation results show that the proposed approach leads to significant performance improvements over exist...
Productivity Gain by Combination of Lean Manufacturing and Mass Customisation Methods in Aviation Industry
Advances in Manufacturing Processes, Intelligent Methods and Systems in Production Engineering
Time study and validation of productivity gains from transforming the assembly system of airline inflight service carts
Aviation companies in Asia Pacific are experiencing increased demand for their products due to gr... more Aviation companies in Asia Pacific are experiencing increased demand for their products due to growth in the air travel industry. The existing systems in these companies are less flexible to produce more product customisations and reliant on expensive skilled labour. An aviation manufacturing company in Singapore addressed this challenge by transforming its existing assembly system of inflight service carts into a flexible and lean system. The door assembly, side panel assembly, base assembly and final assembly are the four areas in the assembly system that were redesigned and implemented the changes. A combination of the lean manufacturing methods and mass customization methods were applied to bring higher value addition and flexibility in the assembly system. The target of this transformation is to improve the productivity and produce higher volume and variety. A study was conducted in the company to investigate the improvements achieved b due to the transformation in the assembly operations. Time studies were conducted and recorded the process time samples in the four areas of the assembly operations before and after the transformation. 2-sample t-tests were conducted on the sample data and performed test of significance of the improvement. The results show significant productivity gains up to 27% in the four areas of assembly operations. The transformed assembly system was run for 3 years and the sustainability of productivity gains were tracked in this period. Annually, recorded the data of average time taken for the assembly operations of each inflight service cart in the four areas. Compared the annual data of assembly process times with that of the time study sample data on productivity gains. Based this comparison, the sustainability of the productivity gain 25% to 27% is confirmed
Reactive repair tool for job shop schedules
International Journal of Production Research, 2005
... Related content: In this: publication; By this: publisher; In this Subject: Materials &am... more ... Related content: In this: publication; By this: publisher; In this Subject: Materials & Manufacturing; By this author: V. Subramaniam ; AS Raheja ; K. Rama Bhupal Reddy. ... others: These icons link to social bookmarking sites where readers can share and discover new web pages. ...
Cell formation with multiple process plans and manufacturing attributes
Journal of Computer Applications in Technology, 2006
In the past decade, substantial research was focused on the development of new cell formation pro... more In the past decade, substantial research was focused on the development of new cell formation procedures. Group formation of machines and parts in cellular manufacturing systems is often achieved by using the similarity of part operations. However during cell ...
Modelling and simulation of just-in-time flexible systems
Sadhana-academy Proceedings in Engineering Sciences, 1997
The increasing worldwide competition requires economical manufacture, high quality and short deli... more The increasing worldwide competition requires economical manufacture, high quality and short delivery time. The Just-In-time (JIT) philosophy of manufacturing is increasingly being considered by manufacturing organizations, as a response to the increased pressure to supply high quality products with short delivery times and at low cost. A very simple shop floor control system that was developed by Toyota in the 1970s specifically for their Just-In-Time assembly plant, has received considerable attention in the Western World, and is known as the ‘kanban’ system (literally translated as ‘card’ system). Japan’s success has prompted many scholars and practitioners, to turn their attention to Japanese management practices. This article is to address the modelling, simulation and implementation issues of Just-In-Time in flexible manufacturing environments. Priority nets are used for modelling and analysis of the kanban system. A large number of simulation runs are conducted/presented to probe the behaviour of the system, with respect to different parameter changes.
Uploads
Papers by Rama Bhupal Reddy