Frequency Response Function module for SKF Microlog Analyzer GX / MX
The Frequency Response Function (FRF) module is designed for use with the GX and MX series of products within the Microlog family.
Key features • Automatic setting of input range for hammer and transducer • Automatic setting of FFT window (rectangular or force & response) • Automatic reject of overloaded data • Automatic reject of double impact • Display of coherence as color, i.e. the FRF is red where coherence is below 80% • Display of Q factor at cursor position The Frequency Response Function module for the Microlog GX / MX has two primary functions: 1. To establish the properties of mechanical structures (mass, stiffness and damping) by performing modal analysis using a calibrated hammer for the excitation. The unit can be used to display the FRF and measurements can be exported to external software to calculate and animate the mode shapes. 2. To measure and display the transfer function (ratio) between two transducers while a machine is running. Measurements can be exported to external software to calculate and animate the Operating Deflection Shapes (ODS).
Graphical representation of the modal parameters enables the characterization of a structure. A key benefit of the module is that it speeds up a modal test by using algorithms to automatically make test settings. Simplified menus also help to quickly and easily set up for a structural test. The user friendly interface enables the display of: • Magnitude and phase versus frequency • Accelerance or apparent mass • Mechanical impedance or mobility • Stiffness or compliance • Coherence
Frequency
Examples of use of this application
Specifications
Response
Structural testing of:
Signal input types: Modal analysis – Channel 1 = modally tuned hammer. Channel 2 = accelerometers, velocity transducers or displacement probes. ODS analysis – Channel 1 & 2 = accelerometers, velocity transducers and displacement probes. Both channels must use the same type of sensor and both must have the same nominal sensitivity.
Function module for SKF Microlog Analyzer GX / MX
• Pipe-work • Bed plates • Castings • Car seats • Brake disks • Gas turbine blades • Aircraft fuselage and attachments • Vehicle chassis and attachments • Performance testing (condition monitoring) of vibration isolation mounts
Y axis scaling units: Accelerance – g/N, m/s2/N, g/lbf, m/s2/lbf Apparent mass – N/g, N/m/s2, lbf/g, lbfm/s2 Mobility – ips/N, mm/s/N, ips/lbf, mm/s/lbf Impedance – N/ips, N/mm/s, lbf/ips, lbf/mms Compliance – mil/N, µm/N, mil/lbf, µm/lbf Stiffness – N/mil, N/µm, lbf/mil, lbf/µm Display: FRF magnitude and phase y axis – linear, log Input signal range: ±40 V max Frequency range: 20kHz
For part numbers and ordering information for SKF Modal Analysis Hammer kits that can be used with the Microlog GX/MX FRF module, please reference data sheet CM2384.
Ordering information CMXA 70-FRF-SL • Frequency Response Function module for the Microlog GX Series Order from: SKF Condition Monitoring San Diego 5271 Viewridge Court, San Diego, California 92123, USA Telephone: +1 858-496-3400 FAX: +1 858-496-3531 A sequence of measurements using a modal hammer as the excitation can be acquired from a structure, exporting data to calculate and display the mode shapes. Alternatively, data can be acquired from a machine while it is in operation and used to generate operating deflection shapes.
Web Site: www.skf.com/cm • ® SKF and Microlog are registered trademarks of the SKF Group. • All other trademarks are the property of their respective owners. © SKF Group 2007 The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless permission is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein. SKF reserves the right to alter any part of this publication without prior notice. SKF Patents include: #US05854553, #US05845230, #US06489884, #US05679900, #US04768380, #US06199422, #US05992237, #US06202491, #US06513386, #US06275781, #US06633822, #US06006164, #US2003_0178515A1, #US6,789,025, #US6,789,360, US 5,633,811 and US 5,870,699, #WO_03_048714A1 Publication CM2382 (12-07) • Printed in the United States of America
CMXA 44-FRF-SL • Frequency Response Function module for the Microlog MX Series Order from: SKF Condition Monitoring Livingston 2 Michaelson Square, Kirkton Campus, Livingston, Scotland, EH54 7DP, Telephone: +44 (0)1506 470011 FAX: +44 (0)1506 470012