1) Optimum design involves selecting design parameters like geometrical, material, and functional parameters to satisfy functional requirements while maximizing desirable effects and minimizing undesirable effects. 2) Adequate design satisfies functional requirements, while optimum design further improves the design by increasing desirable parameters and reducing undesirable ones. 3) Optimization equations are formed relating functional requirements, material parameters, and geometrical parameters to optimize aspects like increasing load capacity or reducing cost.

1. 04
Optimum Design
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

2. GPs : Geometrical Parameters ( A,L,D)
MPs : Material Parameters (ε,α, E)
FRPs : Functional requirements parameters
UEPs :
Undesirable effects Parameters(-ve)
Power Transmission capacity (P)
Load Transmission capacity (W)
Energy storing capacity (E)
Size ,Stress, Cost, Weight
Design Parameters
Deflection of spring (δ)
SPPU Pune’ SRES’ Sanjivani College of Engineering
Kopargaon
DEPs :
Desirable effects Parameters(+ve)
e.g. Helical Spring

3. Adequate design (AD)
Designing object by Selecting GPs and MPs in order to
satisfy function requirements
Optimum design (OD)
By increasing DEP By reducing UEPs
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon
Designing object by Selecting GPs and MPs in order to
satisfy function requirements

4. SPRING
Optimization Equation
Equation in the form of
FRPs, MPs, GPs
Functional requirement:
To carry Load(W)
Ex1
Design object to increase load carrying capacity
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

5. Cost
Design object for Cost reduction
Ex2
Equation in the form of
FRPs, MPs, GPs
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

6. Types of Parameters
Specified Parameters
Unspecified and Unlimited Parameters
Limited Parameters
P=30 Kw
D<=20 mm
Stress<Sut/FoS
2
3
1
U/U
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

7. Types of Equations
Aim: Weight or Cost reduction
2
3
1
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9. Main Design Equation
Stress ?
1
2
3
PDE
SDE
LE
Find Area (A) to minimize cost(Cm)
A is not given
A= U/U

10. LE effect can be directly included in Developed PDE
NORMAL CASE
Eliminate U/U parameter (A)
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

11. Separate Material parameters [MSF]
Final design equation
Developed PDE
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

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Shear stress

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PDE
SDE
SDE 1 SDE 2
LE
Given
q=90
T=900
All units to
be in
m …N…

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Developed PDE
Developed PDE

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Given
q=90
T=900

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