本文主要目的為量測結構之共振頻率與阻尼比，量測架構是利用衝擊槌使結構產生激振，且以單軸向加速規收集原始振動訊號，並以類比/數位轉換卡將訊號進行快速傅立葉轉換，然後將轉換來的振動訊號加以分析。再藉由電磁方程式的推導，結合數學模型之後，即可據以求得結構的動態特性，並將其結果作為修改部分結構量之重要依據，以避開共振頻率所影響之損害，且可預知各個振型並加以評估比較，以求得抑制共振效能，並提供業界在採購新品或設計新的產品時更能防範於未然。本文中實際以興達發電廠複循環汽渦輪發電機軟銅帶為例，經由實際量測結果驗證本論文所提方法之可行。

To meet the criteria based on the designing viewpoints, it is often required to do some certain change of adding or extracting a substructures without reanalyzing the changed structure. For the reason of changing the partial structure, however, must be provide an effective methods to resolve mentioned problem. The purpose of this thesis is to investigate the natural frequency and damping ratio of a line structure. The measuring facilities contain an impact hammer, an accelerometer, an analogue/digital card, and an analysis software based on Fast Fourier Transformer. From the field tests, the characteristics of the structure body can be obtained in Hsin-Ta Power Station T.P.C. By utilizing the electrical- magnetic field equation, the existence of the reasonance force to damage the device from the line current was proved. The practical results changing parts of the structure to avoid of resonant frequency to damage the power device was verified in the thesis.

[1] Siemens Power Generation Group, “Instruction Manual 11-53 MKA 2.02+ GT-Generator：Taiwan Power Company-Hsinta Power Station Combined Cycle, ”Siemens AG. Co., Germany, 1996.

[2] K. G. McConnell, “ Vibration Testing Theory and Practics, ” John Wiley & Sons Inc., New York, 1995.

[3] D. J. Inman, “ Engineering Vibration, ” Prentice Hall Inc., USA, 1994.
[4] S. Tse Francis and E .Morse Ivan, “Measurement and Instrumentation in Engineering ,” Marcel Dekker Inc., New York, 1989.

[5] J. Chang and Y. Gu, “Modal Control of Structures Using Reduced Model,”Proceedings of the 5th International Modal Analysis Conference, pp.909-913, 1987.

[6] Siemens Power Generation Group, “Instruction Manual 10-50 MKA 1.01+ ST-Generator：Taiwan Power Company-Hsinta Power Station Combined Cycle, ”Siemens AG. Co., Germany, 1996.

[7] K. S. Dragolich ,“ Fatigue Data Book：Light Structural alloys ,” Lrary of Congress Cataloging -in-Publication Data ASM Interational ,USA, 1995.

[8] H. E. Boyer, “ Atlas of Fatigue Curves,” America Socicty for Metals, senior Technical Editor, USA, 1986.

[9] C. R. Paul, K. W. White, and S. Y. Nasar, “ Introduction to Electromagnetic Fields, ” 3rd ed., McGraw Hill Book Co., NewYork, pp. 216-220, 1998.

[10] B. D. Popovic,“ Introductory Engineering Electromagnetics,” Addison Wesley Inc.,USA, 1995.

[11] W. H. Hayt Jr. and John A. Buck, “ Engineering Electromagnetics ,” 6th ed. The McGraw-Hill Co., New York, 2000.

[12] C. F. Beards, “ Structural Vibration Analysis and Damping, ” Halsted, USA, 1996.

[13] J. S. Bendat, “ Random Data Analysis and Measurement Procedures, ” John Wiley Inc. ,Singapore, 1991.

[14] S. R. Singiresu, “ Mechanical Vibration, ” Addison-Wesley Publishing Co., USA, 1995.

[15] C. T. Sun and Y. P. Lu, “Vibration Damping of Structural Element,” Prentice Hall Ptr. , USA, 1995.

[16] M. Serridge, “ Piezoelectric Accelerometers and Vibration Preamplifiers,”B & K, Denmark, 1987.

[17] 陳興，“振動量測”，機械月刊，第二十一卷第十一期，pp.184-202，1995。

[18] 謝華隸，“振動量測技術及其應用”，機械月刊，第二十卷第十二期， pp.229-236，1994。

[19] E. O. Brigham and R. E. Morrow, “ The fast Fourier transform,” IEEE Spectrum, Vol. 4, pp. 63-70, 1967.

[20] G. D. Bergland, “A guided tour of the fast Fourier transform,” IEEE Spectrum, Vol. 6, No 7, pp. 41-52, 1969.

[21] 黎文明，“快速傅立葉轉換”， 復漢出版社，台灣，1985。

[22] 許呈雄，“數位濾波器和快速傅立葉轉換技術在阻尼量測上的比較”，機械月刊，第十七卷第五期，pp.145-154，1991。

[23] S. I. Haykin and B. V. Veen, “ Signals and Systems,” John Wiley & Sons Inc., New York, 1999.

[24] H. B. Oehlmann, “ A Method For Analysis Gearbox Faults Using Time Frequency Representation,” Mechanical Systems and Signal Processing, Vol.11, No.4, pp.530-545, 1997.

[25] 姜建國，曹建中，高玉明，“ 信號系統分析基礎 ”，全華科技，台灣，2000。

[26] 蔡萬傳，姚昭智，許茂雄，“結構系統阻尼比測量之理論與應用”，成功大學學報，第三十卷科技醫學篇，pp.41-47，1995。

[27] 張金良，“以時頻表示法應用於振頻分析之方法與應用”，國立成功大學造船暨船舶機械工程研究所，碩士論文，中華民國八十九年七月。

[28] 楊澤民，“小波理論應用於結構自然頻率與阻尼比分析之研究”，國立成功大學造船暨船舶機械工程研究所，碩士論文，中華民國九十年七月。

[29] M. S. Hall and D. A. Hodges, “ Experience with 500kV Subsynchronous Resonance and Resulting Turbine Generator Shaft Damage at Mohave Generating Station, ” IEEE Publication 76ch1066-0-PWR , pp.22-25, 1976.

[30] IEEE Committee Report, “A Bibliographies for Study of Subsynchronous Resonance Between Rotating Machines and Power System, ” IEEE Trans. on PAS, Vol. PAS-95, pp.216-218, Jan./Feb., 1976.