Tip timing measurement chain validation with the Universal Tip Timing Calibrator UTTC, approach and experience
The presentation will outline the motivation, results and experience of the development and application of a Universal Tip Timing Calibrator (UTTC) by the Siemens Tip Timing expert group. Due to the importance of the Tip Timing blade vibration measurement technology for the development of new gas turbine frames it is indispensible to calibrate these systems to international traceable standards. The very complex matter of tip timing signals does not allow to refer to simple physical and easy available laboratory standards in a standard working procedure. Even very sophisticated and expensive arbitrary wave and pattern generators are not able to generate signals to be used as calibration signals for multi-sensor tip timing systems of the last generation. So far, these 3rd and 4th generation Blade Vibration Tip Timing Measurement (BVTTM) systems could not be tested and calibrated completely within their dedicated application range regarding blade vibration amplitude, frequency and dynamic response. Based on this situation, the Siemens Tip Timing expert community decided the development of a universal and wide range application Tip Timing Simulator and Calibrator four years ago. Meanwhile, this device exists and is widely used for BVTTM system development, field system set up, data validation and off-line data evaluation. Inside the paper, the technical features and the software capabilities as well will be described in detail. Finally, two application examples with two different BVTTM systems are presented and the results are being discussed. As a summary it can be expressed, that the UTTC was found as a very helpful instrument for an optimal Tip Timing system setup.