EDM Modal MIMO Stepped Sine
EDM Modal 7.2 introduces a new type of modal testing called Multiple Input Multiple Output (MIMO) Stepped Sine. This technique has been implemented to allow users to control and monitor multiple channels according to an implemented control strategy. This is a whole new module where multiple modal shakers can be used to provide multiple stepped sinusoidal excitations to the structure under test. Using a large channel count data acquisition system like the Spider, this sine shaker excitation method provides higher efficiency and accuracy for the FRF measurements while minimizing local stresses on the test article. The MIMO Stepped Sine also provides a high signal-to-noise ratio of sine excitations because it runs one frequency at a time.

MIMO Stepped Sine.png

Poly-X curve-fitting method for Experimental Modal Analysis (EMA)
The new release version of EDM 7.2 also has a new modal parameter estimation method called Poly-X which is Poly-reference Least Square Complex Frequency Domain (p-LSCF). This is a frequency domain-based curve-fitting method that is used to extract the modal parameters of the structure under test more efficiently. The Poly-X makes it easier for the users to select the stable poles to obtain the natural frequencies and damping of the test structure, based on a much neater Stability Diagram compared to that from the time domain method.


Additional Major Improvements

  • Animation: Added curve smoothing feature

  • Animation: Added node lines feature

  • Animation: Enhanced edit contour feature

  • Band Selection: Added selected function of FRF feature

  • Synthesis: Added correlation and error percent to FRF synthesis

  • Input Channel: Enhancement of TEDS to read DOF details of the sensor (component name, point ID and direction)