General steps to carry out rigid body modal analysis of lower control arm

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The research methodology is a path, the guide to carry out any type of work or process. This investigation focused on a static and dynamic analysis of the lower control arm and its optimization. For this, several stage and sequence of study and analysis are done and are explained briefly as below;

1) Do suspension overview critically

We are all known for the suspension system and its important role in providing ride comfort and handling characteristic. We already have gone through the suspension system's function, about the double wishbone suspension system, its advantage, and why the lower control arm needed analysis?. Although many research types had worked to increase vehicle performance, you can find them in Elsevier and other journals published online. Still, some areas need to be improved by considering the dynamic load act on the suspension system.

2) Lower control arm modeling

Modeling is quite complicated. First, you need to collect the dimension of the control arm. The method you can use reverse engineering approach or else get it through the company. The geometric modeling of the same has been carried out in solid modeling software available in a market; after modeling import to Hypermesh for meshing or meshing software, it is better to go HYPER MESH as it has great control over element type. You can do meshing considering Shell 181, Solid 285 tetrahedral, MPC184 link/Beam, CP-rig elements. Each element selection has a specific significant effect on meshing and analysis.

3) Determine durability analysis method

After modeling LCA( lower control arm), you have to carry out durability static analysis considering Gross Vehicle Weight, Front axle Weight, Rear Axle Weight under 3-2-1 front (lateral, braking, and cornering load) to find the load acting on the Lower control arm during working. It is hard to find out dynamic load through manual calculation or by using mathematical modeling. So, it would e better if you go through simulating the real-world situation. for this quarter, car suspension is to be modeled into MSC Adams ( a simulation software) and analyzed after input of load attire contact patches from available load cases of chassis and frame, consider pothole braking situation and run analysis it will result in load acting on lower control arm in respective direction x,y, and z.

4) Carry out stress analysis and observation

Once after finding forces act on the lower control arm from simulation, use those force to generate a contour plot using stress analysis in the ANSYS tool. Also, carry out modal analysis to determine modes of frequency, Stress, deformation. Then, observe stress and natural frequency contour plot.

5) Optimization of the design

Now you have a frequency, deformation, and stress contour plot. After this, consider the critical parameter you want to optimize. I go with the frequency deformation as deciding factor for longtime working life. So, geometric optimization is done for the critical area. Use a different method that reduces deformation, stress, and stress propagation while improving the lower control arm's first natural frequency.

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