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Design Optimization of an Ideal Steering Mechanism for Double Wishbone and MacPherson Suspensions

Emami, Mohammad Reza | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54293 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Fallah, Famida; Zohoor, Hassan
  7. Abstract:
  8. The steering system is very important in controlling the car. This requires to turning wheels at certain angles. These angles ideally follow the Ackerman geometry. But there is a difference between the real steering angle and the ideal geometry, which caused to steering error. This error depends on two factors, the steering mechanism and the vehicle suspension. Reducing steering error causes to reducing tire wear and increasing vehicle maneuverability at low speeds. In addition, the stability of the vehicle increases when crossing straight line and uneven roads. So far, mechanisms have been designed in accordance with the Ackerman geometry, but in these mechanisms used cam profile. Also the effects of the suspension error in steering has been ignored. The aim of this project is to reduce the steering error caused by the steering mechanism and suspension system. For this purpose, at first a 6-bar mechanism has been designed according to the Ackerman equation in plane mode. This mechanism has been created with proper locating without the using of cam profiles. Then linkage of the mechanism has been change for working with double wishbone and McPherson suspension and calculated equation of suspension's geometry. Then, with using the genetic algorithm method, the steering error is minimized for the range of motion of the suspension systems and the different steering angles. Finally, the maximum value of error has been less than 0.09 degrees. Therefore, this mechanism reduces the total error of the steering mechanism and suspension to almost zero, without using of a cam profile
  9. Keywords:
  10. Optimization ; Macpherson Suspension System ; Steering System ; Steering Box ; Double Wishbone Suspension ; Ackerman Equation

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