Experimental modal analysis is nowadays one of the key technologies in structural testing. m+p international has recently implemented two new modal parameter estimation techniques which greatly simplify the selection of poles, typically the most delicate step during the modal identification process, into its dynamic signal analyzer. The two estimation techniques generate very clear stabilization diagrams as numerical poles are discarded before the stabilization diagram is plotted. Therefore they are valuable tools especially for unpracticed users.
The Polyreference Least-Squares Complex Frequency domain (p-LSCF/Polyfreq) algorithm yields stabilization diagrams which speak for themselves even for high system orders (above 50) in highly damped structures. For the modal analysis of weakly damped structures, we refined the already implemented, widely-used PTD algorithm. This new algorithm is called Polyreference Least-Squares Complex Exponential Plus (PTD+/Polytime+) and it considerably improves the interpretability of the stabilization diagrams, too.
p-LSCF stabilization diagram
The stabilization diagrams of both techniques allow identifying a high number of modes, each with a highly precise estimation for frequency, damping and mode shape.
International automotive supplier Continental
We would like to thank Continental for this long-year, trustful cooperation.
The gearbox of a wind turbine is often regarded as the weak link and requires especially thorough testing. Doosan Corporation Mottroll in South Korea chose m+p international's SO Analyzer to determine vibration and acoustical characteristics as well as verifying that the torques and temperatures are within specifications. The flexibility of SO Analyzer is used to perform multiple measurements on the wind turbine gearbox at different operating powers.
Download our 3-page "Wind Turbine Gearbox Testing" Application Note.
We will showcast our latest technology at the following events:
IMAC-XXX Conference & Exposition on Structural Dynamics
February 11-14, 2013
Hyatt Regency Orange County
Garden City, CA
Booth # 206
April 29-May 2, 2013
San Diego Marriott Del Mar
San Diego, CA
SAE 2013 Noise and Vibration Conference and Exhibition
May 20-23, 2013
DeVos Place Convention Center
Grand Rapids, MI
Booth # 422
SPACE TECH EXPO
May 21 - 23, 2013
Long Beach Convention & Entertainment Centre
Long Beach, CA
Booth # 8031