Frequency characteristics of electro-hydraulic vibrator.
Frequency characteristics of an electro-hydraulic vibrator were measured using two kinds of test signals. First, sine signals had theoretically 1.0 m/s2 (root-mean-square) in the frequency range from 1 to 16 Hz at single axis. The frequency characteristics were flat from 1 to 12 Hz, but 14, 16 Hz was considerably poor. Second, the vibrator was excited when using a complex signal consisting of 12 components in the frequency range from 1 to 12 Hz at single axis. The overall acceleration was 3 and 1 m/s2. Flat characteristics were seen in the tested frequency range. Acceleration distortion was recognized in a higher frequency than the target frequency. This second method is effective for the efficiency of experimental procedure.
Satoh
Noriaki
N
Vibration Laboratory, Common Laboratory Center, University of Occupational and Environmental Health, Yahatanishi-ku, Kitakyushu 807-8555, Japan.
D000054:Acceleration; D004558:Electric Stimulation / Q000379:methods; D006801:Humans; D008433:Mathematics; D008838:Microcomputers; D008962:Models, Theoretical; D012684:Sensory Thresholds / Q000502:physiology*; D014732:Vibration