Vibration test software

MIMO vibration control

There are many different types of multiple shaker table arrangements based on MIMO vibration testing applications. Multi-Exciter Single-Axis (MESA), is an application in which multiple exciters provide dynamic input to a test item along a single axis. For cases in which the two exciters are driven to a common specification with respect to both phase and amplitude, the output may be described basically in one axis of excitation. For cases in which the two exciters are driven to independent magnitude and/or phase specifications, the output may need to be described in terms of a forward axis and aft axis, and perhaps, a rotational axis about the test item’s center-of-gravity (CG). Note that the system would require appropriate bearing assemblies to allow a pure rotational MESA or combined linear and rotational motion. The following photo illustrates a dual shaker vertical push-push arrangement. Three axis shaker tables are available for Multiple-Exciter Multiple-Axis (MEMA) vibration test arrangements. Many vibration testing applications require testing the DUT in simultaneously all three directions. With a three-axis shaker table system, the overall testing time is reduced by two-thirds over single-axis vibration testing along each axis. More importantly, it identifies failures otherwise undetected with single-axis vibration testing. The automotive industry has been running tests on their vehicles for decades using four poster testing systems. Nowadays, with the availability of sophisticated MIMO control, vibration testing with four posters is raised to another new level.