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

Built on Ford F650 Truck
Total weight: 22,000 lbs (9,990 kg)
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

Built by Industrial Vehicles International, Inc.
PC based control unit
Internal sweep options
- Sweep
- Chirps
External analog control
Remote radio start

For additional technical information on this piece of equipment visit the NEES NEES Facilities Database.