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Design and Implementation of a Passive - Active Vibration Isolation System on a Diesel Engine Model

Aliei, Mostafa | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39407 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Durali, Mohammad
  7. Abstract:
  8. This research concentrates on active and passive control of vibrations from a dieselgenerator set. A comprehensive study of the system is performed to design a system to provide minimum vibration transmission from a mid size generator set (300 kw) in a wide frequency range around operating point. The control system consists of two stages, a passive part with mode separation feature and an active part inserting control force by inertial actuators on the intermediate mass. Independence of the performances of passive and active parts of control system and low energy consumption of the active system can be considered as the main advantaged of this system. To evaluate the controller design, a DOF model of the engine was designed and built. The controller is a combination of feedback controller (to reduce vibrations around resonance frequencies) and feed forward part providing transmission reduction in all frequencies. Experimental Results show that vibration transmission reduction in frequency of 40Hz is 29.4db and in frequencies of 80Hz and lower, is more than 20db. The Controller works effectively up to a frequency of 200Hz. The required active vibration control force for frequency of 125Hz and higher is just 5% of the disturbance Force.
    A 3 DOF model of half engine is designed with a scale of 1/3 to the size of the real engine. The model is to be built in continuation of this research. The experiments on this model will generate the know-how for active control of the real engine
  9. Keywords:
  10. Active Control ; Vibration Control ; Adaptive Filters ; Double Stage Vibration Isolation System ; Inertial Actuator ; Filtered-X LMS Algorithm

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