LMS Supplies Data-Aquisition Units To System 3R

System 3R has implemented a test system consisting of two LMS SCADAS III data-acquisition front-end units, each with eight data-acquisition channels and built-in signal-conditioning capabilities. The laptop-size units each connect to the LMS Test.Lab software for test control, measurement, result analysis, data management and report generation in an integrated platform. With accelerometers mounted at several locations, engineers hit the structures with an instrumented hammer to determine their dynamic behavior.

Operational speed-sweep tests are also performed to measure system vibration for a range of machine frequencies. Based on data from these tests, LMS Test Lab generates animated mode-shape and operational-deflection-shape (ODS) displays showing deformation of the hardware. On frequency domain maps, LMS Test.Lab uses colored spikes, called posts, to clearly highlight resonances that otherwise would take hours to spot on raw FRF data. Automation of this task saves time and also yields more accurate and consistent results.

These analyses of the vibration data enable engineers to calculate the energy being transmitted through the components and determine the level of damping required in the interface designed in the holding fixture. Engineers size the interface to deliver the required damping, then, based on these specifications, a prototype VDP is built and the same battery of modal impact and operational tests are run.

LMS Test.Lab analysis plots of machining tests show the level of reduction in vibration amplitudes measured on the workpiece that is held with the VDP system. Test data for vibration with and without the VDP are compared and the design of the damping interface is adjusted accordingly in an iterative process. This damps out as much vibration as possible while maintaining workpiece stability and staying within the packaging requirements of the clamping system.

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