Title page for ETD etd-06292000-13570051


Type of Document Master's Thesis
Author Malowicki, Mark
Author's Email Address mmalowic@vt.edu
URN etd-06292000-13570051
Title Active Vibration Isolation Using an Induced Strain Actuator with Application to Automotive Seat Suspensions
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Leo, Donald J. Committee Chair
Ahmadian, Mehdi Committee Member
Nelson, Douglas J. Committee Member
Keywords
  • piezoceramic
  • car seat
  • active suspension
Date of Defense 2000-06-22
Availability unrestricted
Abstract
The characteristics of an automotive passenger seat in response to vibrational excitations are examined and an active vibration isolation system incorporating smart materials is designed, built, and tested. Human sensitivity to vibration is discussed. Characteristics of road roughness are discussed and used to implement a representative test input to a passenger seat system. extsc{Matlab} is used to model the car seat and vehicle system with four degrees of freedom to determine actuator requirements. Selection and implementation of a low--profile, prestressed piezoceramic device into an active seat suspension system is described, and experimental results of the actuator assembly performance are presented. Vibration isolation is realized in an experimental setup representing one quarter of a seat and passenger's total mass, using one actuator assembly (representing one corner of the seat suspension).

For an input power spectrum representative of a passenger vehicle environment, the smart material actuator assembly, as applied to a quarter seat experimental setup, is proven to be capable of isolating vibration with an isolation frequency of 2Hz and no resonant peak, versus 6Hz and a resonant peak of 2g/g for an actual passenger seat tested.

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