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Optimization of The Engine Mounts to Create the Desired Stiffness to Reduce Noise and Vibration

Shoghi, Mahdi | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52289 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Nejat, Hossein; Salarieh, Hassan
  7. Abstract:
  8. In order to isolate the engine from the body of the car and chassis to reduce transient vibrations, an engine mount system is used. Using its flexible rubber components, the engine grip keeps the car's engine suspended, allowing it to shift power to the body and chassis. The purpose of this project is to optimize the geometry of the engine mount to achieve the desired static and dynamic stiffness values simultaneously. In this regard, by defining the hyperlastic and viscoelastic properties of the material used in the engine mount, we simulated the static stiffness and dynamic stiffness values of one of the most common engine mounts in the automotive industry. Then we investigate the effect of the defined design parameters on the static and dynamic stiffness values by the design of experiment tool, and then use the effective parameters in the optimization process. In the following, we determine the equations governing the values of static stiffness and dynamic stiffness in terms of design parameters by the response surface method. Then, using these equations, the values of static stiffness and dynamic stiffness were optimized by the MATLAB fmincon function. Finally, we examine two other elastomeric engine mounts common in the automotive industry. The results of various optimizations using finite element method show good performance of ARSM algorithm than other algorithms in hyperstudy software and 1% difference between static stiffness value and 0.2% difference between dynamic stiffness value of the optimum geometry with the desired values. Also, the result of the optimization using approximate functions is to find the optimal point in a much less time than the optimization using finite element method
  9. Keywords:
  10. Engine Mount ; Shape Optimization ; Static Stiffness ; Dynamic Stiffness ; Finite Element Method

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