g 100mv /g 0. 5 ~ 5kHz 1 YSV8116 DASP 1 N 2. 2 [ M] { x } + [ C] { x } + [ K]{ x } = { f t } 1 M C K 3 M C K f t x t 1 [ H( ω )] = - ω 2

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1 No. 10 Modular Machine Tool & Automatic Manufacturing Technique Oct DOI /j. cnki. mmtamt * MIMO TH166 TG502 A Dynamic Performance Analysis of Precision Machining Center Based on Experimental Modal Analysis MA Yue YUE Wen-binHUANG Yu-bin SUN Qing-chaoYANG Shuai-jie SUN Xin School of Mechanical Engineering Dalian University of Technology Dalian Liaoning China Abstract On the basis of analyzing the principle of modal testthis paper obtains the natural frequency mode shapes and damping ratio of the precision horizontal machining centerwith the experimental modal a- nalysis method. The test results and the frequency response function analysis verify the good performance in low -frequency characteristics of the measurand. At the same timeon the basis of the comparison between test results and the actual use of the machining center this paper confirms that the table and columns are the key factors to reduce the dynamic performance of machine then makes a local mode test about the table and column on the practical constraints and puts forward some corresponding suggestions for weak partsbased on the theoretical analysis and test results to improve its dynamic performance. And the w ork can provide some reference for the design and test of the same type of machine tool structure. Key words vibration test dynamic characteristics modal analysis MIMO machining center Multiple Input Multiple OutMIMO * E - mail myue@ dlut. edu. cn

2 g 100mv /g 0. 5 ~ 5kHz 1 YSV8116 DASP 1 N 2. 2 [ M] { x } + [ C] { x } + [ K]{ x } = { f t } 1 M C K 3 M C K f t x t 1 [ H( ω )] = - ω 2 [ M ] + jω[ C ] + [ K] ) 2 H ω 1 { X( ω )} = [ H( ω) ]{ F( ω) } p l 2 3 l p H lp ( ω ) = n i = 1 li pi - ω 2 M i + jωc i + K i 4 n li pi l p i M i C i K i i Single Input Multiple OutSIMO MI- MO 1 MIMO MIMO 1 SIMO MIMO 3 SIMO MIMO 2 x y t YC-3 1 YFF-6 78 X Y 125kN PC /N YD YSV2303 1

3 14 10 FRF 80Hz 87Hz YSV X Y Hz 5 YSV rpm 300Hz 500Hz 4kHz 8 Frequency Response Function FRF 116Hz 139Hz 151Hz 4 179Hz 2 5 Hz % Y X Y X Y FRF 0 ~ 160Hz ~ 5 7 FRF 5 FRF 0 ~ 160Hz

4 M16 Hz % Y Y t 6 9 FRF Hz % Y Z Y X Hz MIMO

5 Spiewak S A Nickel T. Vibration based preload estimation in machine tool spindlesj. Machine Tools & Manufacture J Tsai JChou Y. The identification of dynamic characteristics of a single bolt jointj. Journal of Sound & Vibration J J J BW60HS J J E Mottershead M I Friswell. Model updating in structural dynamics a surveyj. Journal of Sound and Vibration Odate JIwahara MSuzuki Ket al. A Research of Vibration Characteristics and Structural Optimization for Tennis 1. J. Racket with Modal Analysis J. Transactions of the Japan Society of Mechanical Engineers C Lee Y SKim H SHan C H. A Study on the Vibrational J Characteristics of the Continuous Circular Cylindrical Shell 3Anthony C O Yalcin M E. Vertical machining center accuracy characterization using laser interferometer angular errors with the Multiple Supports Using the Experimental Modal A- nalysis J. Key Engineering Materials J. Materials Processing Technology J J J BHUSHAN B. Introduction to tribologym. New York J John Wiley&Sons J. 12. M J D J. J J J J J J

JOURNAL OF EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION Vol. 31 No. 5 Oct /35 TU3521 P315.

31 5 2011 10 JOURNAL OF EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION Vol. 31 No. 5 Oct. 2011 1000-1301 2011 05-0075 - 09 510405 1 /35 TU3521 P315. 8 A Earthquake simulation shaking table test and analysis