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The LMS Test.Lab software is being used to perform numerous vibration test cycles for System 3R’s workpiece-clamping chuck, which absorbs machining vibrations in milling machines.

The test system implemented at System 3R consists of two LMS SCADAS III data-acquisition front-end units, each with eight data-acquisition channels and built-in signal-conditioning capabilities.

The laptop-sized 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 behaviour.

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.

Fourier Transform of vibration amplitude versus time data recording generate frequency domain maps for studying the system response at various frequencies.

On these frequency plots, LMS Test.Lab uses coloured 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 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.

Based on these specifications, a prototype VDP is built and the same battery of modal impact and operational tests are run.

LMS Test.Lab signature analysis plots machining tests then shows the level of reduction in vibration amplitudes measured on the workpiece.

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 to damp out as much vibration as possible, while maintaining workpiece stability and staying within the packaging requirements of the clamping system.

Worksheets and templates in LMS Test.Lab shorten the time needed to set up vibration tests.

There are numerous worksheets for specific functions such as modal analysis, time-data processing and signature testing.

Templates have instrumentation sensitivities and other information entered automatically instead of requiring engineers to manually enter the data.

The test setup and required signal processing tasks are defined once, then saved in a template so that procedures can be performed automatically and quickly with consistent results.

This lowers the risk of errors and raises efficiency, with test setup time reported to be at least 30 per cent less for System 3R.

LMS is an engineering innovation partner for companies in the automotive, aerospace and other advanced manufacturing industries. LMS enables its customers to get better products faster to market, and to turn superior process efficiency to their strategic competitive advantage. LMS delivers a unique combination of 1D and 3D virtual simulation software, testing systems, and engineering services. We are focused on the mission critical performance attributes in key manufacturing industries, including structural integrity, handling, safety, reliability, thermal management, fluid dynamics, comfort and sound quality. Through our technology, people and 30 years of experience, LMS has become the partner of choice for most of the leading discrete manufacturing companies worldwide. LMS, a Dassault Systèmes Gold Partner and SIMULIA Partner, is certified to ISO9001:2008 quality standards and operates through a network of subsidiaries and representatives in key locations around the world.

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