International Journal of Mechanical Engineering and Computer Applications, Vol 1, Issue 7, December 2013, ISSN 2320-6349 www.ijmca.org Page 99 Modeling and PID Control Implementation on Double Wishbone Suspension using Multibody Dynamic Approach Anand Tandel 1 , Suhas Deshmukh 2 , Kirankumar Jagtap 3 , Abhijeet Deshpande 4 1 PG student, Mechanical engineering, SITS, Pune tandelanand@gmail.com 2 Department of mechanical engineering, SAE, Pune spdeshmukh.sae@sinhgad.edu 3 Department of mechanical engineering, SITS, Pune krjagtap_sits@sinhgad.edu. 4 Department of mechanical engineering, VIIT, Pune abhijit.deshpande32@gmail.com Abstract— Paper presents modeling and analysis of Double Wishbone Suspension for automotive cars. Multi-Body Dynamic Approach is adopted for modeling and analysis and is modeled using MATLAB Simscape Language. Further comparison of passive and active suspension system is carried out, active system uses PID control approach and it is observed that PID implementation improves the performance of Double Wishbone Suspension system. Keywords—Multibody dynamic analysis, Double wishbone suspension, PID controller, Active quarter car suspension I. INTRODUCTION Automotive car design aims at mass reduction which ultimately reduces fuel consumption and therefore to both economical and environmental benefits [1]. Reduction of the fuel consumption is the main objective, but in the case of suspension systems and their un-sprung masses, the mass reduction also plays an important role in R&H (= Ride and Handling), which has a great impact of the experience of driving, handling and feeling the vehicle[2- 5]. Mainly, the suspension system is used in automobile is to isolate the chassis from the chock loads due to irregularities of the road surface [4, 6-7]. This must be handled without impairing the stability, steering or general handling of the vehicle. These effects lead us to two separate and equally important reasons for having a suspension system, connecting the chassis to the wheels:  enhancing the ride comfort  improving the handling quality of the vehicle If the road forces would be transmitted directly into the chassis, the driver and passengers would suffer severely, and the mechanical structures would be affected by large forces of fatigue loading [9]. Also handling the vehicle would become very difficult, since the tire forces acting on the ground would not be consistently transmitted due to the tire loosing contact with the road surface. Unfortunately, the corrections made to enhance the handling often worsen the ride comfort and vice versa. A very heavy vehicle with a relatively light un-sprung mass tends to be comfortable when driving at reasonably low speeds, whilst a vehicle with a light sprung mass and stiff suspension tend to have better handling capabilities. The un-sprung mass is loosely defined as the mass between the road and the suspension springs, while the sprung mass is that supported on these springs. The goal of present work is to find performance of double wishbone suspension as well as implement a control to achieve a better performance. In present work double wishbone suspension model is developed using MATLAB Simscape Langauge and tested for road input. Section 2 present the multi-body dynamic approach adopted for the analysis, section 3 explains capabilities and tools in SIMSCAPE, and section 4 explains entire modeling and analysis of double wishbone suspension model using MATLAB Simscape. Section 5 explains about results and compares the results with control. II. MULTIBODY DYNAMIC APPROACH Multi-body dynamic analysis is the dynamic analysis of mutually interconnected rigid bodies, whose relative motions are constrained by means of joints. The purpose of this analysis is to find out how these bodies move as system and what forces are generated in the process. The multi-body dynamic analysis is typically applied in automobile industry for the modeling and analysis of suspension system. The multi-body suspension models allow precise evaluation of the effect of suspension geometry and the mechanical characteristics of spring and damper on the ride comfort and vehicle handling performance. The quarter car double wishbone suspension is modeled in SimMechanics 2 nd generation in MATLAB software. SimMechanics is the toolbox of MATLAB, which can be