Title page for etd-0730103-142723


[Back to Results | New Search]

URN etd-0730103-142723
Author Ren-Jei Li
Author's Email Address No Public.
Statistics This thesis had been viewed 5359 times. Download 4623 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2002
Semester 2
Degree Master
Type of Document
Language English
Title Hybrid Fuzzy PID Controller for Tube-Hydroforming Processes via Genetic Algorithms
Date of Defense 2003-06-27
Page Count 82
Keyword
  • tube-hydroforming
  • genetic algorithms
  • hybrid fuzzy PID controller
  • Abstract  In this study, the non-binary coding, elitist strategy, increasing mutation rate, extinction, and immigration strategy are used to improve the simple genetic algorithms. The improved search technique can reduce the possibility of falling into the local optimum due to the premature convergence in a large searching space, and increase the chance of finding out the near-optimal parameters.  
    The hydraulic forming machine used in this thesis, includes a power source of a hydraulic motor and a actuator of two hydraulic cylinders. Both the internal pressure and axial force are controlled to hydroform the tubes into the shapes we want.
    The PID fuzzy logic controller is implemented to control the proportional direction valve and pressure reducing valve of this dual-cylinder electro-hydraulic system so that the loading path can follow the optimal forming curve of axial-feeding and pressure prescribed. From the experimental results, it is clear that the near-optimal PIDFLC controller designed via modified genetic algorithms can make the loading path follow the prescribed curve, and effective for reducing system uncertainty caused by the varying loads and system unstability resulting from the nonlinear characteristics of the hydraulic system.
    Advisory Committee
  • Zone-Ching Lin - chair
  • Tzuen-Lih Chern - co-chair
  • You-Min Huang - co-chair
  • Ing-Rong Horng - advisor
  • Yeong-Maw Hwang - advisor
  • Files
  • etd-0730103-142723.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2003-07-30

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys