What it is
- Sine force: up to 8,000 lbf (35.6 kN) peak with SPA40K
- Random force: up to 8,000 lbf (35.6 kN) rms (V875LS-440 with SPA40K)
- Half-sine shock force: up to 18,952 lbf (84.30 kN) (V875LS-440 with SPA40K)
- Acceleration: up to 112.0 gn sine peak and 100.0 gn random rms (V875LS-440)
- Velocity: 70.9 in/s (1.8 m/s) sine peak
- Displacement: 3.0 in (76.2 mm) peak-to-peak
- Usable frequency range: DC to 3,000 Hz (V875LS-440); DC to 2,600 Hz (V875LS-640)
- Internal load support: 1,323 lb (600 kg)
- Recommended amplifier: LDS SPA8K through SPA40K
Swept and dwell sine testing to 8,000 lbf (35.59 kN) on both armatures with the SPA40K, at up to 112 gn on the 440 mm.
PSD screening and qualification to 8,000 lbf (35.59 kN) rms and 100 gn rms on the V875LS-440, 7,309 lbf (32.51 kN) on the 640 mm.
Two-millisecond half-sine pulses to 18,952 lbf (84.30 kN) with the SPA40K, plus transient time-history replication.
What it is used for
- Low-frequency, long-displacement testing: profiles that need 3.0 in (76.2 mm) of peak-to-peak stroke.
- Random vibration testing: random profiles up to 8,000 lbf (35.6 kN) rms and 100 gn rms with the V875LS-440.
- Sine testing: swept and dwell testing at up to 112 gn with the V875LS-440.
- Mechanical shock testing: 2 ms half-sine pulses up to 18,952 lbf (84.30 kN).
- Large fixtures and payloads: mounting large fixtures on the 25.20 in (640 mm) armature, with test articles supported by the 1,323 lb (600 kg) internal load support.
- Horizontal and under-chamber testing: using a combo slip table, the body rotation gearbox, or under-chamber operation.
Key features
- 3.0 in (76.2 mm) displacement: peak-to-peak stroke with 70.9 in/s (1.8 m/s) velocity.
- Two armature sizes: 440 mm for high acceleration, 640 mm for larger fixtures.
- Five amplifier sizes: SPA8K through SPA40K, so force can be sized to the test program.
- Stiff armature guidance: 57,100 lbf/in (10.0 kN/mm) cross-axial stiffness; rotational stiffness of 235,000 lbf·ft/rad (346 kN·m/rad) on the 440 mm armature and 400,000 lbf·ft/rad (543 kN·m/rad) on the 640 mm armature.
- Two mounting choices: base-mounted, or Lin-E-Air air-isolated trunnions with a body suspension resonance below 5 Hz.
- Low gauss option: reduces stray magnetic field to under 8 gauss (0.8 mT) at 6 in (150 mm) above the table.
- Pneumatics pedestal box: emergency stop, Lin-E-Air suspension air control valve, armature position indicator, and test load control valve.
- Options: combo slip table, V-groove castors, air glide, chamber floor support, cooling fan silencer, thermal management, and head expander.
Why engineers pick it
The V875LS system
- LDS SPA-K switching amplifier: SPA8K to SPA40K; 100 V rms rated output, 80 A rms per 8 kVA increment.
- Pneumatics pedestal box: emergency stop, Lin-E-Air suspension air control, armature position indicator, and test load control.
- Shaker cooling fan: 50 Hz or 60 Hz, with an optional silencer.
Site requirements
- Power: 3-phase, 380 to 500 V, 50/60 Hz as standard. A low-voltage option covers 200 to 220 V, 50/60 Hz. Maximum steady-state input runs from 36.1 kVA (SPA8K) to 64.8 kVA (SPA40K).
- Compressed air: 100 psi (6.9 bar).
- Ambient: shaker +45 to 86 °F (+7 to 30 °C); amplifier +41 to 86 °F (+5 to 30 °C).
- Acoustics: 108 dBA shaker, 99 dBA cooling fan, and 72 dBA amplifier.