The Role of Randomness of a Manual Assembly Line with Walking Workers on Model Validation

Al‐Zuheri, Atiya; Luong, Lee; Xing, Ke

doi:10.1016/j.procir.2012.07.041

Cited by 10 publications

(12 citation statements)

References 26 publications

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“…Defence Support Services are characterised by a stochastic operating environment and featured by uncertainty, variability and randomness which needs to be modelled and added to the final model of the system. Examples of these features are human variability, failures of machines and quality failures, variance in cycle times, variance in the skills of the operators and finally fatigue effects on worker performance (Al-Zuheri et al, 2012). Uncertainty refers to a "lack of knowledge" a sort of "human ambiguity" which implies a risk.…”

Section: Compactedeness Of Technologymentioning

confidence: 99%

A review of Additive Manufacturing technology and Cost Estimation techniques for the defence sector

Busachi

Erkoyuncu

Colegrove

et al. 2017

CIRP Journal of Manufacturing Science and Technology

116

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Additive Manufacturing" (AM) is a promising technology which will provide major advantages to Defence Support Service providers, given its ability of delocalised manufacturing near the point of use. The technology is gaining increasing interest due to its disruptive potential. AM groups together a wide range of different approaches which have the ability to convert a 3D file into a physical product by depositing layer upon layer of material. AM is still under development and considered an immature technology. This immaturity provides high level of uncertainty around key indicators such as time and cost. These indicators represent also key decision variables to evaluate AM and compare it with traditional manufacturing. This review paper represents an investigation of existing knowledge on AM and aims to present to the reader the various AM approaches with a detailed focus on the most applicable technologies to Defence Support Services. The paper is structured as follows, firstly the various technologies of AM and their economic aspects are presented, secondly the cost modelling techniques are investigated and finally a discussion is carried out. The contribution of this paper is to present to Defence Support Service stakeholders the various AM technologies and cost modelling techniques for measuring the product or service cost.

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Section: Compactedeness Of Technologymentioning

confidence: 99%

A review of Additive Manufacturing technology and Cost Estimation techniques for the defence sector

Busachi

Erkoyuncu

Colegrove

et al. 2017

CIRP Journal of Manufacturing Science and Technology

116

View full text Add to dashboard Cite

show abstract

“…& WW system analysis and optimization. [25] identify the levels of process parameters that entail the improvements on both productivity and ergonomics. Other studies of the same authors develop mathematical models considering the structural variables of WW for its optimization, with stochastic task times [26] and a mixed model production [27,28] illustrate the influence of workers' variability and different patterns of imbalances in output, while [29] provides a work-sharing protocol that considers discrete tasks and worker crossovers.…”

Section: Literature Reviewmentioning

confidence: 99%

Walking worker vs fixed worker assembly considering the impact of components exposure on assembly time and energy expenditure

Calzavara

Faccio

Persona

et al. 2021

Int J Adv Manuf Technol

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Recently, the need for assembly systems of better following the market demand has led to the spread of alternative solutions with respect to the traditional fixed worker strategy. Walking worker systems, where operators move across the line to produce the finished product, are gaining always more interest. In this paper, a comparison between the fixed worker (FW) and the walking worker (WW) assembly strategies is provided, by taking into account their differences both in terms of performed activities during assembly and of material exposure at the assembly workstations. The evaluation is carried out through the proposal of a mathematical model, to understand the impact on assembly time and on operators’ energy expenditure. The behavior of the model is investigated both with a parametric analysis and a real case study. The results show that the FW is the best one when the system is working at its maximum throughput, while the WW strategy turns out to be preferable for the lower values of market demand, both from a time and an energy expenditure perspective.

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“…The 3-step productivity is applied in a mobile phone package industry. Single stage parallel line' and Five stage serial line 'configurations are produced and simulated using Witness simulation software [9]. The tools and system adopted in designing a manufacturing unit for ergonomics and time optimization in a Railway coach manufacturing scenario is designed into 3 phases, assembly line sequencing using Delima Quest software, an index to evaluate designs and flow value analysis, workplace assembly and ergonomics analysis using human modelling software Jack5.0, find bottlenecks, JIT, in current network, make improvements either in 'arrangement of work stations 'along line production or in complete product utilization [8].…”

Section: Related Workmentioning

confidence: 99%

“…11.Situational analysis of WWAL using appropriate software to enhance optimization results. Simulational analysis helps us achieve desired precise results [9].…”

Section: Process Parameters For Conversion Of Fwal Into Wwalmentioning

confidence: 99%

A case study on implementation of walking worker assembly line to improve productivity and utilisation of resources in a heavy duty manufacturing industry

Deepak¹,

Srivatsan²,

Samsingh³

2017

FME Transaction

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The Role of Randomness of a Manual Assembly Line with Walking Workers on Model Validation

Cited by 10 publications

References 26 publications

A review of Additive Manufacturing technology and Cost Estimation techniques for the defence sector

A review of Additive Manufacturing technology and Cost Estimation techniques for the defence sector

Walking worker vs fixed worker assembly considering the impact of components exposure on assembly time and energy expenditure

A case study on implementation of walking worker assembly line to improve productivity and utilisation of resources in a heavy duty manufacturing industry

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