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Stiffness, Position and Orientation Optimization of the Engine Mounts to Reduce the Vibrational Noise Transmitted to the Body

Mohaqeqi, Reza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52466 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Nejat, Hossein
  7. Abstract:
  8. Despite the great work done in the field of the engine mount system to reduce vibrations transmitted from the vehicle to the body, an efficient process is still needed to achieve the optimal response to the design of the engine mount system.The goal of the project is to provide an ideal model for optimizing the stiffness, position, and orientation of the vehicle's engine mount system. In this regard, the activities carried out consist of three parts of the modeling, optimization, and verification of the response. In the modeling section, a linear model of 13 degrees of freedom has been proposed for the engine, mount and vehicle assembly, which also has the ability to model the rigidity of the vehicle body in the engine location. Using the proposed model, three main objective functions are presented for optimization. These objective functions, despite the number of degrees of freedom, are due to the definition of the frequency domain rather than the time domain, has more speed and less the volume of quantitative calculations. The result of the optimization of these functions is to provide an effective proposal in which the optimization is carried out in a hierarchical manner from the stated objective functions in which the time to achieve optimal response is reduced. In the following, 10 optimization methods, such as fmincon, pattern search, genetic algorithm, PSO, DE, SA, CS, FA, ABC, and WOA were compared. A number of methods have been used for the first time in this project to optimize the engine mount system. The superiority of methods such as WOA and ABC is due to its higher speed and greater accuracy than some of the most commonly used optimization, such as genetic algorithm is one of the achievements of this project. As a result of optimization, PSO is the best approach among the proposed methods for optimizing the vehicle's engine mount system. Also, the study of the robustness of the obtained solution to the optimization is presented in the proposed model. One of the other achievements of the current projects is to analyze the optimality status of the Quick car and provide better optimal points for it
  9. Keywords:
  10. Engine Mount ; Vibration ; Optimization ; Hardness ; Optimal Position ; Orientation ; Noise Reduction

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