Abstract
The natural frequencies of “rugged” steam-turbine governing-stage impulse blades determined analytically must be verified experimentally when used singly, brazed in pairs or riveted in groups. The most desirable experimental data of natural frequencies and vibratory stresses would be the data which are obtained when the turbine blades are performing in their normal environment. In large steam-turbine units, these ideal experimental data are currently almost impossible to obtain due to inaccessibility even though resonant frequencies rotating turbomachines. Therefore, modified environments must be developed which will provide realistic experimental data for specif turbine-blade structures.
Experimental techniques, fixture design, problems encountered in developing the techniques and fixtures, and versatility of the modified static environment are reported in this paper.
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References
Manson, S. S., Meyer, A. J., Calvert, H. F., andHanson, M. P., “Factors Affecting Vibration of Axial Flow Compressor Blades”Proc. Soc. Exptl. Stress Anal., VII (2),1–15, 1949.
Kemp, R.H., Morgan, W. C. andManson, S. S., “Advances in High-Temperature Strain Gages and Their Application to the Measurement of Vibratory Stresses in Hollow Turbine Blades During Engine Operation,”Ibid.,,VIII (2),187–208, 1951.
Danforth, C. E., andAnderson, B. R., “Vibratory Stress Measurements in Multistage Compressor Blading,”Ibid., XIV (1),21–34, 1956.
French, R. F., “Mechanical Evaluation of Gas-turbins Blades in Their Actual Centrifugal Field,”Experimental Mechanics,2 (4),122–128 (1962).
Vuksta, T., Jr., “Steam Turbine Governing Stage Impulse Blade Vibration Investigation,” ASME Paper 61-WA-122.
Truman, J. C., Martin, J. R., andKlint, R. V., “A Pulsed-air Vibration Technique for Testing High-performance Turbomachinary Blading,”Experimental Mechanics,1 (6),201–205 (1961).
Shannon, J. F., “Vibration Problems in Gas Turbines, Centrifugal and Axial Flow Compressors,” R and M No. 2226, 1945.
Wosney, G. P., “Resonant Vibration Fatigue Testing,”Experimental Mechanics,2 (1),1–8 (1962).
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Vuksta, T. Experimental techniques and fixture design related to steam-turbine blade frequency measurements. Experimental Mechanics 3, 161–167 (1963). https://doi.org/10.1007/BF02327424
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DOI: https://doi.org/10.1007/BF02327424