Design Of Tne Tip-timing Sensor For The Blade Vibration Measurement

The tip-timing vibration measurement technology is one of the most importanttechnique in research of real-time vibration measurement for high-speed blade. Andthe design of tip-timing sensors is key to this technique. Based on tip-timingmeasurement technique, this dissertation, which is financed by National NaturalScience Fund ( Project No. 5000 – "The research of pivotal tip-timing measurementtechnique of rotational blade vibration parameter"), realized two types ofphotoelectric sensor again and designed the Y type of optical bundles tip-timingsensor. In addition the detecting apparatus of fiber light source is analyzed deeply anda new type capacitive pulse sensor is designed to satisfy with the request of thevibration measurement system of high-speed rotational blade.The main work include in the dissertation are shown as follows:1. In the project of tip-timing measurement using fiber sensors, the separativetip-timing sensor and Y type fiber tip-timing sensor are preferential selected, thenwhich are analyzed in theory and demonstrated by experiment.2. The Y type fiber tip-timing sensor is designed. By means of static and dynamicsimulant experiment and field experiment, as well as founded the mathematicmodel, it is proved to be reliable.3. The incorporate design of Y type fiber bundle is researched exploringly. Togetherwith mathematic model, the incorporate fiber bundle structure design is analyzed.4. To the question of high temperature and heavy polluted working environment, thesingle-shielded and the double-shielded capacitive pulse sensors are designed.The mathematic model is also founded. Using drivering cable technique thedouble-shielded capacitive pulse sensor overcame the defect of big parasiticalcapacitance of single shielded sensor. Meanwhile its working reliability isvalidated by dynamic experiment.