IRJET - Structural Optimisation of Upper Control ARM for Double Wishbone Suspension System

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 07 Issue: 03 | Mar 2020 www.irjet.net p-ISSN: 2395-0072
© 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 2297
STRUCTURAL OPTIMISATION OF UPPER CONTROL ARM FOR DOUBLE
WISHBONE SUSPENSION SYSTEM
Umesh.S.Kaur1, Mahesh. B. Dhawale2, Sahil. H. Wanikar3
1Professor (Dept.of Mechanical Engineering, RMD Sinhgad college of Engineering, Pune,Maharastra,India)
2,3Student (Dept.of Mechanical Engineering, RMD Sinhgad college of Engineering, Pune,Maharastra,India)
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Abstract – Structural optimization could be a discipline
handling optimal design of load-carrying mechanical
structures. The suspension of a road vehicle is typically
designed with two objectives namely to isolate the vehicle
body from road irregularities and to take care of contact of
the wheels with the roadway. Most well-liked combinationsin
modern passenger cars are the double wishbone suspension
systems. The aim of this paper is to optimize the Structural
look of the upper control arm of wishbone suspension to
loading. This paper work is proposed to be designed using
CATIA V5 and Finite Element Modal Analysis for wishbone
suspension using ANSYS. Pre-Processing steps like updatingof
element type, application of loads and boundary conditions
are done. Optimization of upper control arm in terms of
structural design for wishbone suspension are done by
reducing its weight and there by the fixed costs, operationcost
are decreased. Thickness of the upper control arm together
with its material is varied in numerous stepstooptimizeitand
maintain factor of safety within limits.
Key Words: Upper Control Arm, Structural Optimization,
Lower Control Arm, FEA Analysis
1. INTRODUCTION
Control arm is one of the most important part of the
suspension system which joins steering knuckle and the
vehicle frame. Control arm is created from the materialslike
steel, iron or aluminum. Suspension arm is significant part
for every vehicle on the road. Due to developing annoying
vibrations and undesirable driving irregularities that would
sometimes cause to road accidents like collision with
another vehicle or obstacle on road if there's no suspension
arm. Suspension arm is fitted in several sorts ofsuspensions
like wishbone or double wishbone, Macpherson strut
suspension. Control arm used for up anddownmovementof
vehicle front suspension system or steering knuckle to tyre
movement . Their need is crucial in automobile industry
allover and can be differed according to its shape, size and
material. Upper control arm can classified into forged metal,
casted metal, sheet metal design and hollow metallic pipe
type. Once upon a time, a double wishbone suspension was
the norm on the front of most cars. They were also called A-
Frames or A-Arms. This design remains common on many
modern cars because it just works. To develop and modify
the existing design of the control lever, it is necessary to
focus on the study of stresses and deformations of the upper
control lever. For the transition structural analysis, modal
8analysis, and optimization, the finiteelementmethodofthe
upper arm is used.
Fig 1: Double Wishbone Suspension System
1.1 Problem Statement
The need of market today is to produce light weight
automobile parts. The main aim is to reduce weight of
suspension system by structurally optimizing the upper
control arm for double wishbone suspension system to
reduce weight and increase strength. This will ultimately
result in reduction of part cost.
1.2 Objective
The main objective of the study is to search out optimized
model of upper control arm which can reduce its weight and
there by fixed charge, operation cost are decreased. To
achieve this objective, following steps must be considered
1. To scale back the general weight of the component up to
10 to 12%.
2. To scale back the value of the component.
3. To extend the strength of the component.
1.3 Scope
It is proposed try to structural analysis on upper control
arm, as per the subsequent.
Theoretical analysis
• Loading calculations for upper control arm.

• Solving the UCA in ANSYS for Finite Element Method
analysis design simulation.
FEA of Existing UCA
• Comparing the results with the project testing analysis.
FEA of Existing UCA
• Testing of the upper control arm under actual conditions
which is in a position to resist the particular loads
2. Theoretical Analysis
Total weight of vehicle W =25987.6 N
Front axle weight F1 =13513.5 N
Rear axle weight F2= 12474.05 N
Tire road coefficient Μ =1.5
Wheel base L= 3040 mm
Avg acceleration a= 2.5 m/s2
Vehicle mass M =1200 kg
Centre of gravity height HCG= 1950 mm
Figure 2.1: Force on Vehicle
Taking Moment at pt A:
ΣmA = 25.987 *X – 12.47 * 3040 = 0
X = 1459.23mm
Bcg = 3040 – X = 1580.77 mm
Front Axle Breaking Force
FB = 0.5 µ (Static + Dynamic)
= 0.5 µ ((W*bcg/l) + (m*a*hcg/l))
FB = 11.57KN
Vertical Force (FV)-
FV = 3/2 [Static+ dynamic load]
FV = 3/2 [W *bcg/l + m* a *hcg/l]
= 23.155 KN
Lateral Force (FL)
FL = W [Static+ dynamic load]
FL = W [bcg* g + a* hcg / gl]
= 17.75 KN
3. FEA of Existing UCA
The existing dimensions of the Mahindra Xylo arm were
taken into consideration and by reverseengineering method
the upper control arm was designed on CATIA V5.Theinitial
weight of the arm was checked on CATIA. Further FEA
analysis was done by meshing and various forces like
vertical, lateral and longitudinal were applied to the UCA on
Ansys 16.0 software. Stress and deformation carried by the
arm was considered for Structural Optimization with safe
limits and sustainable limits. Factorofsafetyisconsidered as
1.5 for Structural Optimization during material removal
process so as the UCA can sustain during favorable
conditions. The CAD model and the Ansys or FEA model is
shown below:
Fig 3.1: CAD Model of Existing arm
Fig 3.2: FEA Model of Existing Arm

Fig 3.3: CAD Model of Experimental Arm
Fig 3.3: FEA Model of Experimental Arm
By using the iteration method weapply variouscondition for
the prevailing component by making holes within the Arm
one by one.
Mass of the prevailing component measured inCATIAwhich
is 3.418 Kg for existing control arm and mass of optimized
control arm is 3.18 Kg .Hence percentage reduction in mass
is 6.9%
Table - 1: Observation table of Weight Calculated
Component Weight (Kg)
Existing 3.418
Iteration 1 3.335
Iteration 2 3.265
Iteration 3 3.18
4. Applications
1. The minimum weight of the design of structures for cars
and other types of mechanical loads.
2. Design of building engineering structures, such as
framework foundations for bridges, towers, chimneys and
dams for a minimal cost.
3. The optimal design of levers, cams, gears, machine tools
and other mechanical components.
4. Designing handling equipment, such as a conveyor belt,
trucks and a crane, at a minimal cost.
5. Conclusion:
FEA Analysis and optimization techniques is used for
effective performance and weightreductionofuppercontrol
arm with good strength. Optimized model shows stress and
deformation values within safe limit and the FOS is 1.5. By
using Iteration Method, Optimization of arm shows 6.9%
weight reduction than existing.
6. References:
[1] Aadesh.R.Shinde, Suyog.S.Wangi,Umesh.S.Kaur,"Material
Optimisation of Upper Control Arm for Double Wishbone
Suspension System", International Research Journal of
Engineering and Technology, Volume: 07 Issue: 03, March
2020 , pp-1923-1926.
[2] Mayur.S.Aware, W.S.Rathod,“Investigation Optimise
Parameter Of Upper Control Arm For Mining Breaker ”,
International Journal of Research in Engineering and
Technology, Volume:07 Issue:06, Jun-2018, pp-101-112.
[3] Bhushan S. Chakor, Y.B.Choudhary, “Analysis and
optimization Of Upper Control Arm of Suspension System”,
International Journal of Research in Engineering and
Technology, Volume:05 Issue:01, Sept-2017,pp-2808-2814.
[4] Nikhil R. Dhivare, Dr. Kishore P. Kolhe, “Vibration
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Issue:02, July-2016, pp-346-367.
[5] S. Mahaboob Khan, T.V.V.S.N.Murti, “Modelling And
Structural Optimization Of Upper Control Arm Using FEA”,
International Journal of Research, Volume:02 Issue:11,
November-2015, pp-789-793.
[6] Shantanu Garud, Pritam Nagare, Rohit Kusalkar,
Vijaysingh Gadhave, Ajinkya Sawant, “ Design And
Optimization Of Double Wishbone Suspension System for
ATVs”, International Journal of Research in Engineering and
Technology, Volume:04 Issue:12, Dec-2017, pp-847-851.
[7] Nikita Gawai, Deepak Yadav, Shewta Chavan, Apoorva
lele, Shreyash Dalvi, “Design, Modelling and Analysis of
Double Wishbone Suspension System”, International
Research and Development of India, Volume:04 Issue:1,
2016.
[8] Mr. Balasaheb Gadade, Dr. R. G. Todkar, “Design,Analysis
of A-type Front Lower Suspension Arm in Commercial
Vehicle”, International Journal of Research in Engineering
and Technology, Volume:02Issue:07,Oct-2015,pp-759-766.

[9] Savan Thacker, Antriksh Bhatt, “Research Paper on
Design and Analysis Double Wishbone Suspension System
using Finite Element Analysis”, International Journal of
Advance Research in Engineering, Science and Technology ,
Volume:02 Issue:7, July-2015, pp-19-22.
[10] Jong-kyu Kim,SeungKu Kim,Hwan-jungSon,Kwon-Hee
Lee, Young-Chul Park, “ The 9th WSEAS International
Conference on Applied Computer And Applied
Computational Science”, Volume:04 Issue:14,Dec-2010, pp-
811-817.
[11] V.V.Jagirdar, M.S.Dadar, V.P.Sulakhe, “Wishbone
Structure For Front Independent Suspension of a Military
Truck”, Defence Science Journal, Volume 60, No. 2, March-
2010, pp-178-183.

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