LMS Test.Lab Signature Testing offers online and off-line harmonic analyses based on narrow-band waterfall spectra and color maps, measured on rotating equipment in any operating condition. Data acquisition supports all signal conditioning available on LMS SCADAS front-ends.
With LMS Test.Lab Signature Testing, spectral data and orders can be measured and processed repeatedly in accordance with custom procedures, making use of pre-defined templates with specified display layouts and measurement settings. The template may contain the complete measurement campaign, covering multiple measurement scenarios. Throughout the execution of the campaign, the user will have feedback on the progress of particular measurements and on the campaign in general.
This solution supports acquisition during run-ups, run-downs or sequences of both, at user-defined time or rpm intervals or at predefined increments of any other slowly varying quantity, like e.g. engine torque. It further supports spectra averaging during (semi-)stationary operating conditions. Derived tacho channels provide online order monitoring, related to rotational speeds that are linked via fixed gear ratios. These channels support order analysis in case of fully variable (CVT) gear ratio. The online processing and visualization formats include RMS-levels, waterfalls, order, frequency, octave and psycho-acoustic sections, as well as statistical quantities. With online derived channels, engineers can calculate and visualize simulated channels in real-time by recombining signals measured on physical channels using both basic and advanced mathematical operations. With multiple sample rates, the amount of saved data can be reduced by acquiring vibration channels at a lower sampling rate, while keeping the high sample rate for acoustic channels. Online reference curves can be used as targets to validate the current design or to check multiple run repeatability.
Intelligent displays provide transparent coupling of measured results to the underlying data, providing fast and convenient in-depth result analysis. Post-processing offers a list of functions for global problem characterization and helps gain a deeper insight into physical processes.
Boosting the power of its testing operations, diesel engine manufacturer Cummins increases turnaround speed 28% in a global initiative that includes standardizing on LMS Test.Lab worldwide. In this way, the company strengthens its dominant market position by launching new products faster, meeting growing demands for customer orders and providing quick response for customer support in the field – all with its existing NVH lab facilities and personnel.
Squeeze cost every way you can by using parts with less material, but make sure these lighter and thinner components of a complex vehicle driveline system do not vibrate excessively. Come up with new concepts for less-expensive yet high-performing rotating subassemblies. Then ensure these bright ideas stay within acceptable noise limits. Reduce the number of prototype tests you are running, but accurately predict the sound quality characteristics of your new product early in development. 
