NEES NEES
Thumper (High Frequency)
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Theoretical Force Output

Thumper Theoretical Force Output Image
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Theoretical Force Output Comparison

Thumper Theoretical Force Output Comparison Image
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Equipment

Thumper (High Frequency Vibroseis)

Developed by Industrial Vehicles International, Inc.
Intended as both a high frequency source with useful force up to 500Hz and as an urban source built on top of a standard Ford 650 chassis.


Specifications

  • International 4300 truck chassis
  • Total weight: 24,820 lbs (11,258 kg)
  • 27 ft (8.23 m) long
  • 8.5 ft (2.6 m) wide
  • 9 ft (2.74 m) tall
  • Built for use in urban environments
  • 2 vibration orientations (shop-transformable)
    • Vertical
    • Horizontal (360 degrees)
  • High-frequency force output
  • Vegetable-based hydraulic oil (Mobil EAL 224H)
  • System Pressure: 4,000 psi (476 bar)
  • Vibrator pump flow: 26.8 GPM (101 l/m)
  • Peak force = 6000 lbs (26.7 kN)
  • Reaction mass weight: 311 lb (141 kg)
  • Baseplate assembly weight = 370 lbs (168 kg)
  • Mass piston area: 1.5 in² (9.7 cm²)
  • Reaction mass stroke: ±1.5 in (3.8 cm)
  • Force becomes stroke and flow limited at 17 Hz
  • Force falls off above approximately 225 Hz due to valve limitations

Control System