What it is
- Sine force: 80.0 kN (17,984 lbf) peak
- Random force: 76.2 kN (17,130 lbf) rms
- Half-sine shock force: 174.8 kN (39,297 lbf) with XPA88K; 254.1 kN (57,124 lbf) with XPA128K
- Acceleration: 100 gn sine peak; 70 gn random rms
- Velocity: 1.8 m/s (70.9 in/s) full field; 2.5 m/s (98.4 in/s) reduced field
- Displacement: 101.6 mm (4.0 in)
- Usable frequency range: 5 Hz to 3,000 Hz
- Internal load support: 800 kg (1,763 lb)
- Overturning moment restraint: 3.0 kN·m (26,552 lbf·in)
Swept-sine resonance search and dwell to 80.0 kN (17,984 lbf) peak and 100 gn for qualification and fatigue across the full 5–3,000 Hz band.
Aggressive large-payload PSD to 76.2 kN (17,130 lbf) rms for environmental qualification and durability testing of complex assemblies.
Two-millisecond half-sine transients to 254.1 kN (57,124 lbf) peak with the XPA128K for avionics, defense, and shock-class programs.
What it is used for
- Sine testing: swept and dwell sinusoidal testing at up to 80.0 kN (17,984 lbf) and 100 gn.
- Random vibration testing: random profiles at up to 76.2 kN (17,130 lbf) rms and 70 gn rms.
- Classical shock testing: 2 ms half-sine shock pulses at up to 254.1 kN (57,124 lbf) with the XPA128K amplifier.
- Low-frequency, long-stroke testing: profiles that need the 101.6 mm (4.0 in) displacement and velocity up to 2.5 m/s (98.4 in/s) in reduced-field mode.
- Heavy and offset payloads: payloads up to 800 kg (1,763 lb) on the internal load support, with 3.0 kN·m (26,552 lbf·in) of overturning moment restraint for offset centers of gravity.
- Vertical and horizontal testing: rotating the body in its trunnion, or pairing the shaker with a horizontal hydrostatic slip table in a combo system.
Key features
- Hydrostatic armature bearing: the moving element runs on a hydrostatic bearing fed by the shaker hydraulic unit, giving 3.0 kN·m (26,552 lbf·in) of overturning moment restraint and 28.6 kN/mm (163,310 lbf/in) of suspension cross-axial stiffness.
- Lin-E-Air trunnion mount: the body rides on Lin-E-Air suspension with a body resonance below 5 Hz. A body rotation gearbox turns the shaker from vertical to horizontal.
- Internal load support: an air-supplied internal load support carries up to 800 kg (1,763 lb) of static payload. Load support pressure is shown at the pedestal control unit.
- Two armature insert patterns: 17 or 29 raised stainless-steel inserts in M8, M10, or 3/8 UNC, on pitch circles from 101.6 mm (4 in) to 406.4 mm (16 in).
- Full-field and reduced-field operation: full field for maximum force, reduced field for velocity up to 2.5 m/s (98.4 in/s).
- Air-cooled: a dedicated cooling fan moves 1.75 m³/s (3,708 ft³/min) through the shaker, with an optional silencer.
- Quiet mode: the system can run with the cooling fan switched off for short periods at low force to minimize acoustic noise.
- Low stray field: under 1.5 mT (15 gauss) at 150 mm (6 in) above the table, full field.
- Pedestal control unit: one station for emergency stop, Lin-E-Air and load support controls, and armature position and load support pressure indicators, linked to the amplifier over CANbus.
Why engineers pick it
The typical V8900 system
- LDS XPA88K or XPA128K amplifier: a switching amplifier with 93% module efficiency, 20 Hz to 3,000 Hz full-power bandwidth, and 100 V rms rated output.
- Vibration controller and data acquisition unit: they close the loop from accelerometer feedback on the armature or payload.
- Pedestal control unit: emergency stop, Lin-E-Air, load support, and armature position control.
- Shaker hydraulic unit: oil supply and return for the hydrostatic bearing. It is always required.
- Cooling fan and starter box: 50 Hz or 60 Hz fan, with an optional silencer.
- Slip table hydraulic unit: added for combo systems with a horizontal slip table.
Site requirements
- Power: the amplifier, shaker hydraulic pump, and cooling fan starter box each need a 3-phase supply of 380 to 480 V, 50/60 Hz. The controller, data acquisition unit, and pedestal control unit each run on a single-phase supply of 110 to 250 V, 50/60 Hz. Total steady-state electrical requirement is 126.15 kVA.
- Compressed air: 6.9 bar (100 psi) to the pedestal control unit for Lin-E-Air and load support.
- Ambient: shaker +7 to 30 °C (+45 to 86 °F); amplifier +5 to 30 °C (+41 to 86 °F).
- Heat and airflow: plan for heat rejection from the cooling fan and amplifier, and for fan acoustic noise of 106 dBA at 1 m (3.3 ft). An acoustic enclosure for the cooling fan is not available from Brüel & Kjær and should be sourced locally if needed.
Configuring and scaling
- Amplifier: XPA88K, or XPA128K for higher shock force.
- Armature insert pattern and thread: 17 or 29 inserts; M8, M10, or 3/8 UNC.
- Combo system: adding a horizontal hydrostatic slip table. Combo performance is quoted separately from the trunnion-mounted ratings.
- Cooling fan: 50 Hz or 60 Hz, with or without the silencer.
- Thermal management and plinth cover kit: optional.