An EPQ Model with Imperfect Production Systems with Rework of Regular Production and Sales Return

Krishnamoorthi, C.; Panayappan, S.

doi:10.4236/ajor.2012.22026

Cited by 22 publications

(9 citation statements)

References 9 publications

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“…In 2012, Krishnamoorthi and Panayappan [10] presented an economic production model for a defective manufacturing system with sales returns and reworking. In this model, it is assumed that defective production items enter the rework process.…”

Section: Research Backgroundmentioning

confidence: 99%

A New Mathematical Model for Economic Ordering with Preventive Maintenance and Reworking in a Supply Chain

Ding

Kaliyaperumal

Wang

2023

Discrete Dynamics in Nature and Society

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Cost reduction in production systems is one of the main concerns of most manufacturing industries. Achieving this goal requires the effective use of resources. Nowadays, due to the competitiveness of production and the need to reduce costs and deliver goods on time, equipment availability and prevention of unexpected stops are particularly important in industrial units. In recent years, equipment, machinery, and human resources have been the foundations of any organization. On the other hand, to increase the productivity and efficiency of providing services and achieve global standards, special attention should be paid to increase the efficiency of machinery and reducing downtime costs. This research conducted a mathematical formulation to find the best possible solution for the economic production quantity and inventory ordering by considering preventive maintenance. In this model, the success of organizations in providing services and increasing the quality depends on various reasons, such as maintenance and repair systems. In the proposed model, the defective items are considered, and the goal is to achieve an optimal amount of production in such a way that the costs of the entire system, including production cost, setup, maintenance, inspection, and rework costs, are minimized during a period per unit of time. The numerical results show that increasing the preventive maintenance periods leads to an upward trend in the total cost of the supply chain. Moreover, the sensitivity analysis shows that the longer the preventive maintenance on the machine, the higher reliability of the system as well as total costs will be achieved.

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Section: Research Backgroundmentioning

confidence: 99%

A New Mathematical Model for Economic Ordering with Preventive Maintenance and Reworking in a Supply Chain

Ding

Kaliyaperumal

Wang

2023

Discrete Dynamics in Nature and Society

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“…Their assumption also was singlestage system with constant rate of rework and deteriorating. Krishnamoorthi and Panayappan [11] evaluated the possible sales return for items with poor quality in a production process with rework allowed. They considered a constant proportion of defective in a single-stage manufacturing system.…”

Section: Literature Reviewmentioning

confidence: 99%

Single and Multi-Stage Manufacturing Systems Under Imperfect Quality Items with Random Defective Rate, Rework and Scrap

2021

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The classical manufacturing systems assume that all of produced items are of perfect quality. They also do not consider the rework process in manufacturing operations. Moreover, most of the previous literature consider single stage production-inventory systems and do not consider multi stage options. However, in real world production-inventory systems, production of defective items is inevitable, and a fraction of the produced items may be defective. In addition, to avoid extra costs and consider environmental issues, organizations tend to reworking activities. We propose single and multi-stage production-inventory systems in manufacturing operations where the process is defective, rework is possible and a percent of items are scrapped. A main assumption, in the current paper, is that the defective rate is assumed to be uncertain parameter. The grey systems theory, as a mathematical tool to address the uncertain information in real-world situations, is utilized to model the random defective rate via a grey nonlinear programming problem. The proposed issues are investigated via numerical examples to assess the impact of grey parameters on optimal solutions.

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“…The sensitivity analyses of the profit function due to different measures o possibility and necessity are performed and presented graphically. Krishnamoorthi and Panayappan (2012) pointed out that in the "Economic Production Quantity (EPQ)" model, which is commonly used by practitioners in the fields of production and inventory management to assist them in making decision on production lot size has a common assumption that all units produced are perfect and shortages are not allowed. However, under real world conditions, the defective items will be produced in each cycle of production and shortages and scrap are possible.…”

Section: Reliability Adjusted Epq (Economic Production Quantity) Modelmentioning

confidence: 99%

A literature review on inventory modeling with reliability consideration

Ahmed

Sultana²

2013

10.5267/j.ijiec

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Inventories are the materials stored either waiting for processing or experiencing processing and in some cases for future delivery. Inventories are treated both as blessings and evil. As they are like money placed in a drawer, assets tied up in investments, incurring costs for the care of the stored material and also subject to spoilage and obsolescence there have been a spate of programs developed by industries, all aimed at reducing inventory levels and increasing efficiency on the shop floor. Nevertheless, they do have positive purposes such as stable source of input required for production, less replenishment and may reduce ordering costs because of economies of scale. Finished goods inventories provide for better customer service. So formulating a suitable inventory model is one of the major concerns for an industry. Again considering reliability of any process is an important trend in the current research activities. Inventory models could be both deterministic and probabilistic and both of which must account for the reliability of the associated production process. This paper discusses the major works in the field of inventory modeling driven by reliability considerations, which ranges from the very beginning to latest works just published.

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An EPQ Model with Imperfect Production Systems with Rework of Regular Production and Sales Return

Cited by 22 publications

References 9 publications

A New Mathematical Model for Economic Ordering with Preventive Maintenance and Reworking in a Supply Chain

A New Mathematical Model for Economic Ordering with Preventive Maintenance and Reworking in a Supply Chain

Single and Multi-Stage Manufacturing Systems Under Imperfect Quality Items with Random Defective Rate, Rework and Scrap

A literature review on inventory modeling with reliability consideration

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