STRESS ANALYSIS AND OPTIMIZATION OF ENGINE MOUNT

Transcription

1 International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 6, June 2017, pp Article ID: IJMET_08_06_016 Available online at ISSN Print: and ISSN Online: IAEME Publication Scopus Indexed STRESS ANALYSIS AND OPTIMIZATION OF ENGINE MOUNT Abburi Lakshmankumar Assistant Professor, Department of Mechanical Engineering, SRM University, Kattankulathur, Tamilnadu, India Kolli Balasivaramareddy Assistant Professor, Department of Mechanical Engineering, SRM University, Kattankulathur, Tamilnadu, India A. Sathiskumar PG Student, Department of Mechanical Engineering, SRM University, Kattankulathut, Tamilnadu, India N. Kuthus PG Student, Department of Mechanical Engineering, SRM University, Kattankulathut, Tamilnadu, India ABSTRACT The Engine Mount is the one of the main component in automobiles and that mount holds the transmission and engine is called transmission mount and engine mount. This project deals with the design and optimization of Engine mount by using Hyper Works and Abaqus CAE Software. The Preprocessing and Post Processing is carried out by Hyper Mesh and Hyper View respectively. Abaqus CAE software is used for finding the solution for models. The results were found to be around vicinity and within the working limits. The stress distribution of the engine mounting bracket of Finite Element Analysis results is closer to the theoretical concept. Key words: FEA, Hyper Mesh and Loading conditions (Mission, Impulsive and Extreme) Cite this Article: Abburi Lakshmankumar, Kolli Balasivaramareddy, A. Sathiskumar, N. Kuthus, Stress Analysis and Optimization of Engine Mount, International Journal of Mechanical Engineering and Technology, 8(6), 2017, pp

2 Abburi Lakshmankumar, Kolli Balasivaramareddy, A. Sathiskumar, N. Kuthus 1. INTRODUCTION The Automobile industries are now a day s mainly concentrate on reducing the fuel consumption and increasing the vehicle performance. In automobile vehicles number of vibration and equipments which affect the vehicle body due to on even loads and imperfect Due to the differing speeds and uneven roads, chassis bodies have undergone unbalancing force. From unbalanced masses exist within the engine body resonant vibrations generated. This is main reason of designer to direct their attention to the top quality of the engine mount [1]. The engine bracket lightly damped which is required for vibration reduction and acoustic comfort. The designer mainly concentrates with the vibration reduction and comfort of riding before design the mount. At present research is going on engine mount bracket will be used in light weight materials and also optimizing the engine design to meet the design as safe. Initially the engine mount design is created in solid works after that the design is exported to Hyper Works software it is used in an industry, modern structural analysis solver for linear and non-linear structural problems under static and dynamic loadings. The main objective of this work is to reduce the stress in engine mount for this we consider three loading conditions Mission, Impulsive and Extreme and we check before rib creation in engine mount stress value and after rid creation in engine mount stress value. 2. MODELING AND ANALYSIS: Initially we created solid model by using solid works. For this work we choose the aluminium alloy material now a days in most of automobiles they are using aluminium alloy only because of its light weight, Specific strength is higher and also cost wise it is less compare to the other steel alloy materials. The Mechanical properties of aluminium alloy 356 selected from the aluminium association. The youngs modulus is Mpa, Poisson ratios is 0.33, Density is e -6 kg/mm 3 and Yield strength is 165Mpa.After that Import the solid model in Hyper Works and assign the Mechanical properties MESH CRITERIA Element type - Tetra mesh Element Size - 3 mm Number of elements Number of nodes We select the meshing of the mount is done with Tet mesh higher order with Quality the Tet collapse mesh is shown in figure editor@iaeme.com

3 Stress Analysis and Optimization of Engine Mount Figure 2.1 Tet Collapse Checking BOUNDARY CONDITION In the bolt holes, we need to create rbe2 element where center node is lie on the center of the hole which has of its degree of freedom fixed. The rbe2 element which is used to fix engine mount and body of the vehicle which gives the stiffness and also transfers the loads as it is and Here, we used as a rigid element in all bolt holes to fix it. In the centroid of the rigid, where degrees of freedom is fixed LOADING CONDITIONS The Three types of load conditions are selected and it is shown in table2.1 Loading conditions. For Each Load conditions, Values of load is varying with respect to Engine conditions like Idle, Medium load and heavy load condition. Table 2.1 Loading Conditions S.No Loading conditions Values(Newton) 1 Mission Load at X-axis-279 Load at Y-axis-1787 Load at Z-axis Impulsive Load at X-axis-499 Load at Y-axis-3943 Load at Z-axis Extreme Load at X-axis-2633 Load at Y-axis-3008 Load at Z-axis After giving loading conditions import the panel in hyper view and check the displacement contour and stress contoure in Hyper view editor@iaeme.com

4 Abburi Lakshmankumar, Kolli Balasivaramareddy, A. Sathiskumar, N. Kuthus (a) (b) Figure 2.2 (a) Displacement and (b) Stress contour in Hyper work After that the model is imported to meshed model in CAE solver software Abaqus. Then run solver for stress and Displacement checking in all three loading conditions before crating the rib in engine mount it is shown in Figure 2.3 Stress results for different loading conditions. (a) (b)

5 Stress Analysis and Optimization of Engine Mount Figure 2.3 (a) Maximum stress on Mission loading condition (73.07Mpa), (b) Maximum stress on Impulsive loading condition (97.81Mpa), (c) Maximum stress on Extreme condition (238Mpa). From the Above result, for first two load condition, stress is within the safe limit. But for Extreme load condition, stress is above the yield strength of the material. It is not within the safe range. (c) Figure 2.4 After creating ribs in the mount We are going to use optimization technique to reduce the maximum stress for this we are created three ribs in the model in engine mount this model is shown in figure 2.4 After creating rib in the mount. Again in solver we run the same three loading conditions and check the stress values for after crating the ribs in the engine mount it is shown in figure 2.5 Maximum stress in different loading conditions

6 Abburi Lakshmankumar, Kolli Balasivaramareddy, A. Sathiskumar, N. Kuthus (a) (b) (c) Figure 2.5 (a) Maximum stress on Mission loading condition (51.75Mpa), (b) Maximum stress on Impulsive loading condition (86.27Mpa), (c) Maximum stress on Extreme condition (129Mpa). 3. RESULTS AND DISCUSSION It can be seen from the above results, we can get the von mises stress for engine mount in a given applied load conditions. From the Table No 3.1, we can get the maximum stress for Extreme loading condition, This Stress is maximum than yield strength of the Aluminum. So the Design of the Engine Mount does not meet the target, In order to avoid the failure, the optimization technique like Creating the rib, Bead, Hole, Slot by adding or removing the material to reduce the Von misses stress value. Table 3.1 Stress Results Before Rib creation S.No Loading Conditions Target Conditions(Mpa) Stress Values(Mpa) 1 Mission 60% of yield strength < Impulsive 80% of yield strength < Extreme <= yield strength editor@iaeme.com

7 Stress Analysis and Optimization of Engine Mount In that we are creating the rib i.e. by adding the material to the mount to reducing the stress value. After creating the rib in the mounts and run the analysis for the same load conditions. Table 3.2 Stress results After Ribs creation S.No Loading Conditions Target Conditions(Mpa) Stress Values(Mpa) 1 Mission 60% of yield strength < Impulsive 80% of yield strength < Extreme <= yield strength In the Extreme Load condition, stress value is get reduced from 238 Mpa to 129Mpa by adding the three ribs in the mount to increase the stiffness in order to reduce the stress. From the Table No 3.1 and Table No 3.2, We can get to know the Maximum stress gets reduced to less than the yield strength of the Aluminum for Extreme load condition. Now the engine mount stress is within the target value. So, now the design is Safe. so that variation is shown in figure 3.1 Comparison stress values Before and after ribs creations Around 45% percentage of stress can be reduced by using the optimization technique like Rib creation. The mass of the base line model is kg and mass of the optimized model is kg 4. CONCULISION Figure 3.1 Comparison chart of Sress Results before and after creation on ribs. The Abaqus CAE and Hyper mesh software has been used to analyze the engine mounting strength. This work is a contribution to the how to strength the engine mount to meet the target value by without changing the material values or change the cad design. We can use optimization technique like creating Ribs, Bead, Change the Hole diameter and changing the fillet radius. The results gets from the static analysis have shown that the Creating ribs can increase the strength and its safe for the required utilization. The primary benefit of this optimization technique we not need to go back to CAD design to change the design of the mount. Within the design itself, we can use this optimization technique to meet the target design safe. For Future also, we can use this technique for other materials used for engine mount design not only mounts other automobile parts also meet safe condition Around 20% to 45% percentage of stress can be reduced by using the optimization technique editor@iaeme.com

8 Abburi Lakshmankumar, Kolli Balasivaramareddy, A. Sathiskumar, N. Kuthus REFERENCES [1] Sandeep Maski, Yadavalli Basavaraj, Finite Element Analysis of Engine Mounting bracket by considering pretension effect and service load, ijret, , Aug 2015,Vol4. [2] Ritesh Bhairappa Dhamoji, Dr.Santosh V Angad, Prof. Anand S N, Strength and Stiffness Analysis of an Engine bracket, IJTRE, , Jun 2016, Volume 3. [3] Monali Deshmukh, Prof. K R Sontakke, Analysis and Optimization of Engine Mounting Bracket, IJSER, , May 2015, Volume 3. [4] P.D. Jadhav, Ramakrishna, Finite Element Analysis of Engine Mount Bracket, IJAETMAS, 1-10, Sep 2014,Volume 1. [5] Rahul S Kadolkar, Anand C Mattikalli, Finite Element Analysis of Engine Mounting Bracket, IRJET, , Sep 2016, Volume 3. [6] Koushik. S, Static and Vibration Analysis of Engine Mounting Bracket of TMX 20-2 using OptiStruct, Altair technology conference, 1-7, Mar2013, Simulate to innovate. [7] Abdul Ridah Saleh Al-Fatlawi and Dhoha Saad Hanoon, Stress Analysis of CFRP Strengthened Slabs Subjected to Temperature Change. International Journal of Civil Engineering and Technology, 8(1), 2017, pp [8] Nedim Pervan, Elmedin Mešić and Mirsad Čolić. Stress Analysis of External Fixator Based on Stainless Steel and Composite Material. International Journal of Mechanical Engineering and Technology, 8(1), 2017, pp [9] Agharkakli. D. P. Wagh. etal, Linear Characterization of Engine Mount and Body Mount for Crash Analysis, International Journal of Engineering and Advanced Technology, , 2013, Volume 3. [10] U. S. Ghorpade, D. S. Chavan, V. Patil, M. Gaikwad, Finite Element Analysis and Natural Frequency Optimization of Engine Bracket, International Journal of Mechanical and Industrial Engineering, , 2012, Volume editor@iaeme.com