International Journal of Advanced Engineering Research and Science (IJAERS) [Vol-4, Issue-3, Mar- 2017] https://dx.doi.org/10.22161/ijaers.4.3.9 ISSN: 2349-6495(P) | 2456-1908(O) www.ijaers.com Page | 55 Modal Analysis of Engine Supporting Bracket using Finite Element Analysis A.S. Adkine 1 , Prof.G.P.Overikar 2 , Prof. S .S. Surwase 3 1 PG Student Department of Mechanical Engineering, Shree Tuljabhavani College of Engineering, Tuljapur, India 2 Assistant Prof. Department of Mechanical Engineering, Shree Tuljabhavani College of Engineering, Tuljapur, India 3 Associate Prof. Department of Mechanical Engineering, Shree Tuljabhavani College of Engineering, Tuljapur, India Abstract— The Engine supporting bracket plays a vital role by reducing noise, vibration and harshness. The current work describes the finite element approch for modal and static structural analysis of engine supporting bracket. CAD model of engine supporting bracket was created in CATIA software and same was analyzed for stress and vibration analysis using ANSYS workbench 15.0. Both initial design and modified design was compared for output responses in terms of equivalent Von-Mises stress, deformation and strain energy absorbed. In modal analysis, bracket was considered for vibration studies. The sole aim of modal analysis was to check whether the self excitation frequency of engine supporting bracket was less than natural frequency. Four alternative materials (Gray C.I., Aluminum alloy, Magnesium alloy and ERW-1) were analyzed. Stress analysis results suggest that deformation and Von-Mises stresses observed in EEW-1 materials was less (0.495 mm and 164.87 MPa). Further natural frequency of modified design was found to be 257.83 Hz which was well within the range below self-excitation frequency and less than the natural frequency (268.59 Hz) of initial design. It was found that aluminum bracket limit its use for the said application due to greater deformation and less stiffness. Magnesium bracket can be the option to ERW-1 steel for the Engine supporting bracket application but it cannot be deployed as it is highly susceptible to corrosion. From the results, it can be concluded that ERW-1 material best suit the requirement of the desired application and can be deployed with some safety standards. Keywords— Engine Supporting bracket, Finite element analysis, Modal Analysis. I. INTRODUCTION Engine supporting assembly includes support members which are attached to a main frame vehicle body. A good mounting system separates engine generating vibration from vehicle body and suppresses the effect uneven road surface inputs to the vehicle driver. Noise, vibration and harshness are important vehicles characteristics and decrement in these characteristics motivates manufacturer for achieving customer satisfaction. The automotive engine bracket is very important due to different aspect of vehicle performance. The finite element model of engine mount is created using CAD & Hypermesh and simulation of the engine mount is carried out using LS-Dyna. Based on the finite element model created, the mountings frequency response function curves are determined and multi- dimensional effects in the mounts responses are observed. Engine mounts in which the design of four arm symmetry engine mount curve is obtained from LS-Dyna approach follows exactly the experimental test curve and also this design has the highest natural frequency amongst all of design iterations. The engine mounts time dependent response study is compared to the ones obtained using a damping material model suggested by the automotive constructors. The results indicated that the rubber used in the engine mount had increased the frequency from 1.2Hz (Basic design) to 1.8Hz (four arm symmetry) [1] . Model of Engine Mount bracket assembly was performed using FEA and modal analysis techniques. Mg alloy bracket has highest natural frequency followed by Al alloy & Cast Iron gives less frequency so it is rejected. The results are compared with experimental results and it was found that the bracket manufactured with Mg alloy gives optimized frequency. In addition, Al can be used in few applications but CI alloy gives minimum frequency. Mg and Al are preferred [2] . 3-D modeling of the engine mount has been designed using CATIA V5 software. The computational testing on the component is done at isotropic state through the application of Thermo-mechanical Vibration Analysis using the Comsol Multiphysics 4.2 version software. The main objective of the research is to reduce weight without changing impact of the component. The Engine mounting bracket is been used to reduction of the vibration created by the engine. The results obtained states that 60% of the weight reduction is done to the component. The weight is reduced 60% through the usage of the optimized AlSiC MMC composite material made component. The future work focuses on the cost reduction of the material without varying the weight of the component [3] . Alternative materials for Static Structural Analysis of Bracket Using Materials are Cast Iron, Aluminum & Magnesium & Equivalent (von misses) stresses of