An entropy-based approach for assessing a product's BOM blocking effect on a manufacturing process flow

Abstract

The current global competition requires companies to follow a demand driven, product-oriented manufacturing approach, on which manufacturing complexity increases as a result of product configuration. Even though different manufacturing complexity measures have been developed, none of them seem to notice the blocking effect a product's BOM imposes on the process flow. The main original contribution of this paper is the development of an entropic formulation to address this last issue. Its validity and usefulness is put to the test via a discrete-event simulation study of a job shop. Our findings show that the entropic formulation act as a fairly good trend indicator of the system's performance parameters increase/decrease. Future research will focus on developing correcting factors so the entropic formulation can be used as an estimator of the final values.

Process selection methodology for near net shape manufacturing

“…Wiendahl and Scholtissek [75] expand the complexity concept to the whole manufacturing process, including product design, operation (process equipment, tools and labour) and structure. Similar to the previous authors, [48] quantity the manufacturing complexity using an entropic approach. Their model evaluates both the various component types and technologies used in a manufacturing system on the system's structural complexity.…”

An Entropy-Based Formulation for Assessing the Complexity Level of a Mass Customization Industry 4.0 Environment

“…e predictive validity refers to the ability to "predict" a theorized outcome, which is provided by following an entropy-based approach, as suggested by Reference [56]. e construct validity refers to the formality of the development process, which is based on previous published work by the author [76,77], where an entropybased metric of a product's BOM blocking effect is derived. e usefulness of the βε MC 4.0 expression is demonstrated via the use of a discrete-event simulation model of a mass customization production system operating within an Industry 4.0 environment.…”

“…At this point, it must be noted that, in order for the βε MC 4.0 expression to truly represent the manufacturing complexity of a mass customization production system operating within an Industry 4.0 environment, the complexity contribution of the product, process, and resources elements must be taken into account. ese elements refer to (i) Product: the different number of manufactured products, the number of number of corresponding components and functions, and the overall products' mix ratio (ii) Process: the different routings for each product and the corresponding processing times (iii) Resources: the different types of machinery, number and type of operations capable of performing, and number of required setups Mass customization measurement [24,27,67] Mass customization and complexity [27,68,69] Mass customization and flexibility [22,[72][73][74][75] Flexibility and complexity [30] 4 Mathematical Problems in Engineering Now, Martínez-Olvera explained in his work of [76] (equation 1) and [77] (equation 2) why formulations such as the ones presented by [58,86] need to be modified in order to reflect the impact the BOM structure has on the process flow. In a similar way, equations (1) and (2) must be adapted in order to reflect the manufacturing complexity contribution to the mass customization production system operating within an Industry 4.0 environment:…”

Spacecraft Assembly Process Bill of Material Construction Technology For Single-Piece Production

“…Min Liu et al studied the transformation between EBOM (Engineering Bill of Material) and maintainability BOM [1]; Chen Zhi et al used BOM to carry out research on multi-product joint inventory management technology, which involved BOM construction technology [2]; Jang Hyun Lee et al proposed a suitable BOM construction technology for shipbuilding, which can display the product structure and information [3]; Gonen Singer et al proposed a BOM conversion technology from plan to production for small batch of complex products , which can add additional information in the BOM [4]; Tsai Chi Kuo built a low-carbon products BOM in PDM system through the standardized data collection forms and search engine system [5]; C. Martinez-Olvera studied the influence of BOM on the process [6].…”