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Theoretical Force Output

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Theoretical Force Output Comparison

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Equipment

Liquidator (Low Frequency Vibroseis)

Developed by Industrial Vehicles International, Inc.
The only large vibroseis designed to provide useful force below 1Hz, which enables low frequency liquefaction studies.

Specifications

• Buggy-mounted vibrator
• Total weight: 70,000 lbs (31,750 kg)
• 32 ft (9.8 m) long
• 8 ft (2.4 m) wide
• Hydraulic drive system (<15 mph)
• Articulated body
• 2 vibration orientations (shop-transformable)
  • Vertical
  • Horizontal (transverse)
• External hydraulic takeoffs for use on other equipment
• Cone penetrometer functionality added to rear of vehicle
• Vegetable-based hydraulic oil (Mobil EAL 224H)
• System Pressure: 3,000 psi (207 bar)
• Vibrator pump flow: 140 GPM (530 l/m)
• 13,000 lb (5900 kg) reaction mass (compared to 3500 lbs for conventional vibroseis)
• Peak-to-peak stroke of 16 inches (40.6 cm) (compared to 1.75 in for conventional vibroseis)
• Unique base plate isolation system with resonant frequency of 0.3Hz (compared to about 1.5 Hz for conventional air bag isolation)
• Accomodates ± 5 inches of base plate movement vertically or horizontally (compared to less than 2 in for conventional vibroseis)
• Peak force: 20,000 lbs (89 kN)
• Force at 1Hz: 10,000 lbs (45 kN)
• Reaction mass weight: 13,000 lbs (3,575 kg)
• Mass piston area: 6.7 in² (43.2 cm²)
• Reaction mass stroke: ±8 in (20.3 cm)
• Force becomes stroke limited at 1.3 Hz
• Force Calibration (PDF, 110K)

Control System

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