Vibration Exciter
for Modal and Component Testing

ELECTRO-SEIS^® Long Stroke Shakers with linear bearings

The APS Dynamics series of ELECTRO-SEIS shakers with linear 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.

Available Vibration Exciter

  Overview  

  APS 113 Exciter
  APS 400 Exciter

Applications

• Determination of natural mode frequencies, shapes damping ratios, and stress distributions
• Excitation for transmissibility measurement
• Seismic simulation for components

Features

• Generate sinewave, swept sinewave, random or impulse force waveforms, fully adjustable at source.
• Test set-up flexibility - operate in fixed body, free body, and free armature - reaction mass modes.
• Optimized to deliver power to resonant load with minimum shaker weight and drive power
• Adjustable armature re-centering for horizontal and vertical operation or other required pre-loads
• Rugged armature with linear guidance system carries full weight of body
• One or two man portability

Description and Characteristics

The APS Dynamics series of ELECTRO-SEIS shakers have been optimized for driving structures at their natural resonance frequencies. These are electrodynamic force generators, the outputs of which are directly proportional to the instantaneous value of the applied current, independent of frequency and load response. They can deliver random or transient as well as sinusoidal waveforms of force to the load. The ample armature stroke allows driving antinodes of large structures at low frequencies and permits rated force at low frequencies when operating in a free body mode.

The units employ permanent magnets and are configured such that the armature coil remains in a uniform magnetic field over the entire stroke range - assuring force linearity. The enclosed, self-cooled construction provides safety and minimum maintenance.