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Minimum Design Index Formula

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Minimum Design Index is a comparable quantity in conceptual design phase which considers Cost, Weight and Time period indices. Check FAQs

DI min = \frac{(CI \cdot P c) + (WI \cdot P w) + (TI \cdot P t)}{100}

DI_min - Minimum Design Index?CI - Cost Index?P_c - Cost Priority (%)?WI - Weight Index?P_w - Weight Priority (%)?TI - Period Index?P_t - Period Priority (%)?

Minimum Design Index Example

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Here is how the Minimum Design Index equation looks like with Values.

Here is how the Minimum Design Index equation looks like with Units.

Here is how the Minimum Design Index equation looks like.

160 = \frac{(1327.913 \cdot 10.11) + (50.98 \cdot 15.1) + (95 \cdot 19)}{100}

160 = \frac{(1327.913 \cdot 10.11) + (50.98 \cdot 15.1) + (95 \cdot 19)}{100}

160 = \frac{(1327.913 \cdot 10.11) + (50.98 \cdot 15.1) + (95 \cdot 19)}{100}

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Minimum Design Index Solution

Follow our step by step solution on how to calculate Minimum Design Index?

FIRST Step Consider the formula

DI min = \frac{(CI \cdot P c) + (WI \cdot P w) + (TI \cdot P t)}{100}

Next Step Substitute values of Variables

∴

DI min = \frac{(1327.913 \cdot 10.11) + (50.98 \cdot 15.1) + (95 \cdot 19)}{100}

Next Step Prepare to Evaluate

∴

DI min = \frac{(1327.913 \cdot 10.11) + (50.98 \cdot 15.1) + (95 \cdot 19)}{100}

Next Step Evaluate

∴

DI min = 159.9999843

LAST Step Rounding Answer

∴

DI min = 160

Minimum Design Index Formula Elements

Variables

Minimum Design Index

Minimum Design Index is a comparable quantity in conceptual design phase which considers Cost, Weight and Time period indices.

Symbol: DI_min

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Minimum Design Index

Open Variable

Cost Index

Cost Index is the summation of all the contributors in cost configuration parameters. The cost configuration parameters are valued on the scale of 0-10 (best=10 and worst=0).

Symbol: CI

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Cost Index

Open Variable

Cost Priority (%)

Cost Priority (%) is a factor which shows the priority of cost objective on a percentage scale. It is oriented according to the user's definition of priorities.

Symbol: P_c

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Cost Priority (%)

Open Variable

Weight Index

Weight Index is the summation of all the contributors in weight configuration parameters. The weight configuration parameters are valued on the scale of 0-10 (best=10 and worst=0).

Symbol: WI

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Weight Index

Open Variable

Weight Priority (%)

Weight Priority (%) is a factor which shows the priority of Weight factor on a percentage scale. It is oriented according to the user's definition of priorities.

Symbol: P_w

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Weight Priority (%)

Open Variable

Period Index

Period Index is the summation of all the contributors in period configuration parameters. The Period configuration parameters are valued on the scale of 0-10 (best=10 and worst=0).

Symbol: TI

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Period Index

Open Variable

Period Priority (%)

Period Priority (%) is a factor which shows the priority of time factor on a percentage scale. It is oriented according to the user's definition of priorities.

Symbol: P_t

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Period Priority (%)

Open Variable

Other formulas in Design Process category

Go Cost Index given Minimum Design Index

CI = \frac{(DI min \cdot 100) - (WI \cdot P w) - (TI \cdot P t)}{P c}

Go Period of Design Index given Minimum Design Index

TI = \frac{(DI min \cdot 100) - (WI \cdot P w) - (CI \cdot P c)}{P t}

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How to Evaluate Minimum Design Index?

Minimum Design Index evaluator uses Minimum Design Index = ((Cost Index*Cost Priority (%))+(Weight Index*Weight Priority (%))+(Period Index*Period Priority (%)))/100 to evaluate the Minimum Design Index, The Minimum Design Index is defined as the lowest achievable value for the design index of an aircraft. It reflects the most efficient configuration, systems, and operational procedures that minimize operating costs while meeting regulatory and performance requirements. Minimum Design Index is denoted by DI_min symbol.

How to evaluate Minimum Design Index using this online evaluator? To use this online evaluator for Minimum Design Index, enter Cost Index (CI), Cost Priority (%) (P_c), Weight Index (WI), Weight Priority (%) (P_w), Period Index (TI) & Period Priority (%) (P_t) and hit the calculate button.

FAQs on Minimum Design Index

What is the formula to find Minimum Design Index?

The formula of Minimum Design Index is expressed as Minimum Design Index = ((Cost Index*Cost Priority (%))+(Weight Index*Weight Priority (%))+(Period Index*Period Priority (%)))/100. Here is an example- 31.30848 = ((1327.913*10.11)+(50.98*15.1)+(95*19))/100.

How to calculate Minimum Design Index?

With Cost Index (CI), Cost Priority (%) (P_c), Weight Index (WI), Weight Priority (%) (P_w), Period Index (TI) & Period Priority (%) (P_t) we can find Minimum Design Index using the formula - Minimum Design Index = ((Cost Index*Cost Priority (%))+(Weight Index*Weight Priority (%))+(Period Index*Period Priority (%)))/100.

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