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Qwestrum Engineering360 · Industrial & Production · Supply Chain Management

Supply Chain Network Design

Network design decides facility locations and flows for cost, service, and risk balance.
Exam tip: keep SI units consistent end-to-end, write the governing relation symbolically before substituting, and sanity-check magnitude and sign.

Key formulas & points

Skim these first — then read the full notes below.

  • Push vs pull supply chain strategy
  • Hub-and-spoke vs direct shipment
  • Nearshoring reduces lead time risk

Topic details

Introduction

Supply chain network structure strongly influences long-term profitability. Chase operations strategy and Buffa texts link location and flow decisions to responsiveness and logistics cost.

Key relations & formulas

Formulas (Indian textbook notation)

  • transportcost=rate×distance×volumetransport cost = rate \times distance \times volume

Formulas (Indian textbook notation)

  • facility location: centre of gravity (ΣQ_{ix}_i/ΣQ_{i})

Formulas (Indian textbook notation)

  • safetystockSS=z×σdemand×Lsafety stock SS = z \times \sigma_{demand} \times \sqrt{L}

Notation and sign conventions

Relation 1 —
transportcost=rate×distance×volumetransport cost = rate \times distance \times volume

Formulas (Indian textbook notation)

  • transportcost=rate×distance×volumetransport cost = rate \times distance \times volume
Write this relation with symbols exactly as in Sunil Chopra Scm — Standard reference before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.
Relation 2 —
facilitylocation:centreofgravityfacility location: centre of gravity

Formulas (Indian textbook notation)

  • facility location: centre of gravity (ΣQ_{ix}_i/ΣQ_{i})
Write this relation with symbols exactly as in Sunil Chopra Scm — Standard reference before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.
Relation 3 —
safetystockSS=z×σdemand×Lsafety stock SS = z \times \sigma_{demand} \times \sqrt{L}

Formulas (Indian textbook notation)

  • safetystockSS=z×σdemand×Lsafety stock SS = z \times \sigma_{demand} \times \sqrt{L}
Write this relation with symbols exactly as in Sunil Chopra Scm — Standard reference before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.

Concept in depth

Design choices include number and placement of plants, warehouses, and distribution channels. Quantitative tools such as center-of-gravity, transportation models, and service-level stock formulas guide configuration. Groover production systems perspective adds manufacturing footprint and lead-time synchronization concerns.

Assumptions and validity limits

State assumptions explicitly before using any relation for supply chain network design — steady state, uniform properties, linear elastic material, ideal gas, incompressible flow, etc., as applicable.
Wrong assumptions invalidate the entire solution even when the formula is correct. In Supply Chain viva and GATE descriptive questions, listing valid assumptions often earns separate marks.

Step-by-step problem approach

1. Read the question and list given data with SI units (common in Supply Chain papers).
2. Draw a neat labelled diagram where applicable — examiners in Indian universities award diagram marks even when arithmetic slips.
3. Identify which relation from this topic applies to supply chain network design.
4. Use equation 1:
transportcost=rate×distance×volumetransport cost = rate \times distance \times volume
.
5. Use equation 2:
facilitylocation:centreofgravityfacility location: centre of gravity
.
6. Substitute values, compute, and verify units and sign (direction).
7. State conclusion in one line — e.g. safe/unsafe, stable/unstable, feasible/infeasible.

Applications & exam relevance

Supply Chain Network Design appears in FMCG and manufacturing. In Indian industrial curricula this topic is tested because it connects theory to procurement, logistics, and networks.
GATE and semester exams often combine supply chain network design with earlier units — revise prerequisites before attempting mixed problems.
Industry interview panels sometimes ask: "Where did you use supply chain network design?" — answer with a lab, mini-project, or plant visit example if possible.

Common mistakes in exams

Students often optimize only transport cost and ignore service constraints. Another mistake is using average demand in safety stock without variability term.

Quick revision checklist

Before attempting supply chain network design problems, confirm you can:
1. Push vs pull supply chain strategy
2. Hub-and-spoke vs direct shipment
3. Nearshoring reduces lead time risk
Revise the solved examples in Sunil Chopra Scm — Standard reference and one previous-year GATE or university paper for this unit.

Worked examples

Try the problem first — open the solution when you are ready to check.

Center of gravity x-coordinate

Problem

Demand points: (x,Q) = (10,100), (20,150), (30,50). Find x* by center-of-gravity.

Solution

x* = (10x100 + 20x150 + 30x50)/(100+150+50) = (1000+3000+1500)/300 = 18.33.

Conceptual check — Supply Chain Network Design

Problem

In a Supply Chain semester or GATE paper you are asked: "State the main assumption, the governing relation, and one practical consequence of supply chain network design." What should a complete answer include?

📖 Standard books (India)

  • Sunil Chopra Scm — Standard reference

    Read: Syllabus unit

    Referenced in Indian B.Tech syllabus

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