The project described in this article was devoted to demonstrating new technology and exploring concepts, which, if not new, have not been traditionally applied to ground vibration testing of aircraft. The test was unusual in several respects: It was conducted on a shoestring budget with a borrowed airplane in a borrowed hangar. A collaborative demonstration and development test was performed on a 737-200 transport airplane, including participants from university, manufacturer, and vendor organizations. Concepts were explored and demonstrated which suggest the potential to significantly reduce the test flow time for aircraft GVT. Some of these concepts, such as transient excitation, have long been successfully applied to other structures but are new to airplane testing and will likely see increased use in the future. The digital sensors and associated acquisition hardware clearly demonstrated the value and timesavmg resulting from reduced cabling requirements. The TEDS sensors facilitate sensor identification and automate the calibration entry. The test team must still associate the sensor serial number with a geometric location, and assure that the sensing direction is correct. Work remains to implement approaches for nonlinear ID from transient and uncertainty assessment to reduce the time Figure 14 Cross-MAC comparing mode shapes derived from- y axis - transient excitation; x-axis - MIMO dual-random excitation that is traditionally devoted to sine testing. As test flow time is greatly reduced, so is the time for data assessment, modal analysis and model correlation. This increases the risk that anomalies or errors may go undiscovered until later. Successful test completion normally requires a complete modal analysis and validation and a convincing model correlation. Improvements are needed in the software tools for data assessment, visibility, validation, identification, and correlation, possibly aided by automation and autonomous components. The diverse participants benefited from the opportunity to work together and share ideas in a practical and relevant test environment. The vendor and university participants were able to experience first hand the issues and challenges of testing a transport airplane. The manufacturer sponsors were exposed to new products and ideas. Freed from the usual pressures and unconstrained by tradition and habits, the manufacturer sponsors were able to take risks and try new approaches.
New concepts in aircraft ground vibration testing
Neue Konzepte für Flugzeug Boden-Schwingungsprüfungen
Sound and Vibration ; 40 , 10 ; 12-18
2006
7 Seiten, 14 Bilder, 1 Tabelle, 21 Quellen
Aufsatz (Zeitschrift)
Englisch
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