Download Planning Demand-Driven Disassembly for Remanufacturing by Ian M. Langella (auth.) PDF

By Ian M. Langella (auth.)

Remanufacturing has bought expanding recognition within the contemporary previous as extra businesses interact in product restoration administration.

Ian M. Langella examines the making plans of disassembly for remanufacturing of used items, yielding parts that are reassembled into “as strong as new” goods. via an intensive research of the underlying making plans challenge, basic insights are attained and heuristic resolution tools are constructed and demonstrated. even if the heuristics express sturdy functionality, they continue to be easy adequate to be utilized to industrial-sized difficulties. the writer considers either settings the place yields are deterministic and stochastic and the place the volume of back items is constrained.

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Let xzi = x ˆzi ∀i ∈ I. ∀i ∈ I 3. for all Leaves in leaf set (∀k ∈ K) (a) if i∈I xzi · πi,k ≥ Dk i. then xpk = 0,xdk = i∈I xzi · πi,k − Dk ii. else xdk = 0,xpk = Dk − i∈I xzi · πi,k iii. end if 4. end Heuristic 4 : Round down heuristic The second rounding heuristic will round down the core values to the nearest integer and adjust the leaf decisions. 1. start Solve LP Model, obtaining optimal core solution denoted xˆzi 2. let xzi = x ˆzi ∀i ∈ I. ∀i ∈ I 3. for all Leaves in leaf set (∀k ∈ K) (a) if i∈I xzi · πi,k ≥ Dk i.

Their model leaves out external leaf procurement so all demands must be satisfied by disassembly, but includes a return constraint specifying the amount of cores available for purchase and disassembly. Gupta et al. (2000) build on this model and extend it using a deterministic yield rate for the components. Good components are sold to reassembly, while bad components are recycled resulting in an additional revenue stream. Both of these approaches have non-linear objective functions complicating our ability to obtain an optimal solution.

2 Disassembly depth and sequencing Disassembly depth deals how much effort should be expended in the disassembly of a product, or alternatively how completely a product should be disassembled. In this area, Navin-Chandra (1994) provides the first glimpse into this problem. Disassembly, being very manual, can be seen to have mostly linear costs with time. g. cannibalization) or to isolate materials (as a precursor to material recycling), the benefit curve is a stepped one. Specifically, once certain components are separated, the value of the disassembly is increased.

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