Modal Analysis of Rotors in Operation vRotorModal Sensor Database Time Recording Time data Derotator Geometry Generator Short Measurements for various Operating Points The vRotorModal is a system for determining the modal values of rotating components during operation. In the case of brake discs, for example, the change in natural frequencies and damping are determined as a function of the brake pressure. vRotorModal System includes the following components:  Accelerometers  Slip ring transmitter  Speed sensor  Data acquisition  Recorder software  Analysis software Signals The signals from the acceleration sensors fixed into the brake disc are transmitted to the measurement data acquisition via the slip rings. Recorder With the vAnalyzer recorder, all vibration signals and the tachometer signal are sampled and stored synchronously. The further processing of the time data for the operating modal or operating deflection shape analysis takes place offline with the vRotorModal software.

vRotorModal The main module of the rotating OMA is the vRotorModal software. It includes the following components:       Generation of the wireframe model Derotation of the sensor signals Angle-dependent assignment of the time blocks OMA calculation ODS calculation Animation of the deflection shapes Results ODS  Frequency  Operating Deflection Shape Results OMA  Natural frequencies  Damping  Mode Shapes The short measurement times allow to do a high amount of tests for various operating parameters within an acceptable time. Example: Brake Rotor  Measurement time per operating point...