Northern Illinois University

Baxter Reliability Laboratory

Vibration Testing

resonance search

Vibration testing involves stimulating a product with a pre-determined force over a frequency spectrum. Vibration forces are transferred to the product by fixturing attached to the moving element of the electrodynamic shaker. The shaker is controlled by a closed loop vibration control system.

Result: Repeatable results and accurate reproduction of real world vibration (shipping and handling, and use environments). Several categories of vibration can be run on NIU's electrodynamic vibration systems such as sine, random, resonoance search and dwell, shock, sine on random, random on random, and others. These stress environments may or may note be applicable depending on the product application and are therefore tailored to the product at hand.

Equipment Identification

  • Manufacturer: Ling Electronics (shaker and amplifier)
  • Manufacturer:  Vibration Research (controller)
  • Model: 612U (shaker); Model: DMA-66 (amplifier); Model: VR8500-4 (controller)

Shaker Specifications

  • Vertical & Horizontal (slip plate)
  • Force (sine)                     6000 LBF
  • Force (random)               6000 LBF
  • Force (shock)                 12000 LBF
  • Displacement (p-p)          1.5 in
  • Velocity (max)                 70 in/ sec
  • Acceleration (max)           120 g
  • Frequency Range             5 to 3000 Hz

Amplifier Specifications

  • KVA                  36
  • RMS Amps       300
  • Peak Amps       900
  • RMS Volts        120

Controller Specifications

  • 1 Analog output (drive)
  • 4 Analog inputs
  • Software includes:            Sine, Random, Sine-on-Random, Random-on-Random, Shock, Kurtosis, etc.