Electrodynamic Vibration Shaker System for High Frequency Vibration Testing

What is an ELECTRODYNAMIC SHAKER ?

Electrodynamic Shaker Test System provides a testing platform for transportation simulation, mechanical shock, mission profile, Environmental Stress Screening (ESS), and more. With dynamic and enhanced performance in displacement, velocity, acceleration, and force, Electrodynamic Shakers accurately simulate a wide range of conditions that can help improve product and test quality and reliability.

An ATMARS Vibration Shaker can test in a vertical or horizontal orientation; utilize a fixture, sliptable, or head expander; and interface with an ATMARS's AGREE Environmental Test Chamber. From running random and sine-to-shock, sine-on-random, and random-in-random tests, our vibration test systems will meet your specific vibration testing needs.

Armature

ATMARS armatures are lightweight and durable for maximized acceleration levels. Radial-finned design directs uniform forces through a bonded structure to the specimen mounting surface. This mounting surface incorporates standoffs arranged on concentric bolt circles that minimize thermal transfer and support long-term reliability testing. Custom wound armatures are available for specific performance.

Head Expander

Head Expanders (Round or Square) and (Head) Plates (Round or Square) increase the mounting area for attaching fixtures and products to an electrodynamic shaker table. Various insert patterns are available. And multiple items can be tested at the same time, decreasing total test cycle time. In addition, with Guided Head Expanders and Added Load Support, heavy payloads with large foot prints can be safely mounted and tested on the shaker, minimizing the risk of damage to the shaker suspension system. ATMARS head expanders and head plates are designed for proper stiffness (i.e. gusseted and welded) and are made of durable while light-weight magnesium alloys, providing high strength-to-weight ratio. Head expander weight is reduced where practical and features corrosion protection.

Sliptable
ATMARS electrodynamic shakers have the option of being used with sliptables and a trunnion allowing vibration tests to be performed in the horizontal axis by rotating the electrodynamic shaker 90°. Our single piece table construction with a solid trunnion limits the relative body motion of the electrodynamic shaker and improves low frequency/high displacement performance of the overall system. This solid trunnion and base configuration also limits potential problems associated with misalignment.

Oil Film
The precision surfaced magnesium plate rides on a film of oil which is circulated by a low pressure pumping system. The oil film provides a low friction surface and acts as a damping medium for restraint of resonances, pitch, yaw and roll moments. A standard relief valve directs non-required oil out of the pump back to the oil reservoir to increase pump life instead of re-circulating within the pump at temperature. A rubberized dirt shield forms the outer edge of the slipplate to prevent foreign matter from contaminating the oil and the oil from splashing out.

Linear Guide Bearing
This concept combines a standard slip table assembly with hydrostatic bearings to provide high restraint to pitch, yaw and roll moments, while preserving the damping characteristics of an oil film. This system allows testing of heavy products with high centers of gravity and is available with low or high pressure oil supply.

Fixture

Custom fixtures can be designed and manufactured to meet unique customer requirements.

Bearings
Hydrostatic Bearing Guide / V-Type Bearing Guide / Medium Pressure Bearing Guide

Power Amplifier: ATMARS modular power amplifier for the electrodynamic vibration shaker system is air-cooled and highly efficient to drive the shaker, field coils, blower unit and other ancillary components to full output capability over a user-specified frequency range. (Linear/Switching Power Amplifier)

Formula
Force(N) = Mass(kg) x Accelration( m/s2 or g)
Effective Mass = Shaker Armature + device under test(DUT) + fixture (head expander / sliptable with driver bar)