Poly-X, the Poly-reference LSCF Implementation and Experiment

Abstract
A poly-reference least-square method for modal parameter identification of a system in frequency-domain is discussed and implemented. It can also be considered as a multi-reference frequency-domain implementation of the recognized time-domain based Least-Squares Complex Exponential (LSCE) estimator.  The main advantages of the Poly-reference Least-Squares Complex Frequency-domain estimator (p-LSCF) are its capabilities of handling high system orders and high modal density. The stability diagram is much cleaner which makes the selection of system poles easier. Other advantages are lower computational times and the ability to handle multiple references. The Poly-X is Crystal Instruments’ version of p-LSCF, which is included in the EDM Modal software package. A MIMO FRF experimental test is carried out to demonstrate these advantages.

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EDM 8.0 Release

Crystal Instruments is pleased to announce the release of EDM 8.0, the most advanced featured version of Engineering Data Management software. This new release of EDM supports exciting new hardware systems, convenient new software features, and helpful online resources.  

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Variable Sampling Rate for Synchronized Data Acquisition

The Spider-80Xi platform gives users the immense flexibility to combine the Spider-80Xi, Spider-80SGi or Spider-80Ti devices into one system with synchronized data acquisition. The Spider-80SG and Spider-80SGi can work as general-purpose data acquisition systems that not only supports strain measurement but also supports several sensor types requiring precision excitation voltage, including MEMS and strain gage based sensors. The Spider-80Ti on the other hand can acquire temperature data along with any other type of measurement quantity by using it with any combination of Spider-80Xs and Spider-80SGs.

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IMAC XXXVII Review

Crystal Instruments exhibited a highly advanced new set of tools called “EDM Modal”, at IMAC 2019 in Orlando, Florida. IMAC XXXVII maintained a broader focus and chose this year’s theme as “Predictive Modeling for Engineering Design and Decision Making.” The conference took on a note of focusing more on general-purpose data acquisition while still maintaining a strong academic focus on the principles of modal analysis.

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