LMS Test.Lab MIMO Normal Modes Testing

LMS Test.Lab MIMO Normal Modes Testing presents multiple input and output phase appropriation techniques. It is designed to measure resonance frequency, damping and mode shapes of a structure. LMS Test.Lab MIMO Normal Modes Testing automatically adjusts amplitude and phase of the forces injected into the structure to tune a single, normal vibration mode. The solution provides manual and automatic resonance tracking as well as force appropriation techniques. The frequency and forcing vector must be identified and applied in such a way that the complete structure vibrates only according to the desired mode and that all acceleration responses are in phase quadrature with the input force vector.

LMS Test.Lab MIMO Normal Modes Testing offers an intuitive way to define channel, acquisition, tuned modes and tuning parameters. In all stages, the user gets feedback on the parameters defined, so that the test setup can be maximally validated before the actual testing starts. Based on frequency response functions measured with either random or sine excitation, users can easily define the force ratio that needs to be applied for each mode. Manual tuning provides manually control of drive frequency and level. Force realization is a special MIMO FRF-based control algorithm using singular value decomposition for the FRF matrix inversions that provides high accuracy of the required force vector. During actual measurements, all relevant information such as Lissajous display, scatter diagram, mode indicator function, animated geometry and time data can be displayed and monitored online.

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