The APS Dynamics series of the air bearing long stroke vibration exciters provide excellent properties for low-frequency excitation of accelerometers and other low-frequency instruments and sensors.
These are DC response electrodynamic shakers that operate at frequencies up to 200 Hz with a peak-to-peak stroke of 150 mm (6 inches). Acceleration amplitudes as high as 60 m/s2 (6 g) can be achieved.
Some models have a horizontal air bearing table coupled to the driver unit that allows high payloads up to 23 kg for the calibration of geophones and other devices. The shakers can also operate in the horizontal or vertical orientation.
The APS Dynamics series of ELECTRO-SEIS shakers with ball bearings are force generators specifically designed to be used alone or in arrays for modal excitation of various structures.
They find use in forced excitation of complex structures such as floors, bridges, aircraft, spacecraft, and automobiles. Furthermore, they can be used for low-frequency vibration testing of components and assemblies.
Have you ever heard of the tragic collapse of Tacoma Narrows Bridge in 1940 which was later called the “Pearl Harbor of engineering“? Unfortunately, the structure of the bridge had not been tested the way our APS shakers can test its dynamic properties.
Determination of dynamic properties, fatigue testing of substructures
Earthquake Simulation, Field data replication
Sine excitation of forklift structure
The APS 400 and 420 shakers were used to do modal testing at the large jet engine.
Measuring the dispersive nature of surface waves in the ground (using APS 400)
Portable Tuned Mass Damper Testing for Vibration Control of Pedestrian Bridges (using APS 113)