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Environmental – Control Options


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Sine Notching and Random Response Limiting

LMS Test.Lab Sine Notching and LMS Test.Lab Random Response Limiting help users effectively protect test items against over-testing. While the average control signal level matches its reference spectrum, the test object response at particular points may greatly differ, due to resonances during the testing phase. The vibration level at any channel (control or measurement) is limited by an auxiliary reference profile for maximum protection of the test item.

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Combined modes

The LMS Test.Lab Sine on Random (SoR) module offers the possibility to define a background noise level combined with up to ten fixed and sweeping sine tones. The LMS Test.Lab Random on Random (RoR) option offers the possibility to define a background noise level combined with an unlimited number of fixed and sweeping narrow-band signals. Both options in combination with LMS Test.Lab Random Control provide complex profile definition, typically called Sine on Random on Random (SoRoR).

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Shock Response Synthesis

LMS Test.Lab Shock Response Synthesis synthesizes a time waveform that corresponds to a user-defined shock response using a series of superimposed wavelets, a series of superimposed damped sine or a chirp sine. The synthesis module is seamlessly integrated into the shock control application.

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Mission Synthesis

LMS Test.Lab Mission Synthesis helps define test specifications for single axis random and swept sine vibration testing from measured load data. Resulting test specifications are equal in damage and are accelerated for faster run times. Test tailoring methods as described in industry standards such as GAM EG-13, MIL-STD 810F and NATO AECTP 200 are used for this purpose. Multiple acceleration loading environments (defined in either time or frequency domain) are analyzed for fatigue potential by calculating MRS (maximum response spectrum) and FDS (fatigue damage spectrum).

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MIMO Triax Random Control – 3x3 configuration

LMS Test.Lab MIMO Triax Random Control is capable of running up to 3 DACs and an unlimited number of measurement channels simultaneously for MIMO closed-loop random control. It includes all necessary features to define and control a random excitation that matches a predefined PSD profile on different measurements points using multiple shakers. Phase control, cross-coupling compensation and adaptive control are based on the Smallwood algorithm for decoupled XYZ MIMO shaker table setups.

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Test Sequencing

LMS Test.Lab Test Sequencing defines and executes a series of closed-loop vibration control tests. For a smooth and unattended batch execution, the application supports mixing all test modes (swept sine, random and shock), do-loops, pause commands and a variety of SelfCheck options. In addition, it is possible to automatically run the MS Windows program as part of the schedule. This can be used to control other equipment in the lab, synchronize vibration testing with functional or climatic testing, or keep the operator up-to-date on the progress of the test sequence by email.

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Tracked Sine Dwell and Time Recording during Sine and Tracked Sine Dwell Control

The LMS Test.Lab Tracked Sine Dwell module excites the structure at a fixed frequency, or at a resonance frequency with frequency tracking. Abort criteria in both control and response levels and frequency range abort in case of tracking dwell are foreseen. Arbitrary sequences of dwell frequencies can be easily defined using the resonance identification tool. LMS Test.Lab Time Recording during Sine and Tracked Sine Dwell Control acquires fixed sampled gapless time data in parallel with a sine or tracked sine dwell control test. The user can select the sample rate for this parallel recording by specifying the desired amount of over-sampling with respect to the maximum sweep frequency. The recorded time data can be further processed using all post-processing products that support this format. 


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Single Axis Waveform Replication

LMS Test.Lab Single Axis Waveform Replication gets field data to the shaker in fewer steps and extends current testing techniques from classical sine, tracked sine, random and shock control to long-duration time waveform replication. The easy-to-use, native MS Windows software requires little training and helps operators automate very long duration tests with full security. The workflow-based user interface of LMS Test.Lab assists the user throughout the complete test.


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Off-line Sine Reduction

LMS Test.Lab Off-line Sine Reduction analyzes the response of a structure at different points to a controlled sine excitation. Throughput data are streamed to disc during the online sine reduction application and can be re-analyzed off-line. A COLA (consistant output level adaptor) channel is required to accurately determine sine excitation frequency.


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Environmental – Analysis options

Dedicated noise and vibration analysis add-ins are easily activated and become an integral part of LMS Test.Lab Environmental extending the system for MST (modal survey tests) applications. 3D visualization of measurement results for structural analysis (operational deflection shapes, time animation) or access to any other LMS Test.Lab analysis module is only one click away. This eliminates tedious data exports to more advanced analysis applications, such as LMS Test.Lab Geometry and LMS Test.Lab Operational Deflection Shape and Time Animation, LMS Test.Lab Modal Analysis and LMS Test.Lab Operational Modal Analysis, LMS Test.Lab Run Data Averaging and Comparison Organizer.

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