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

10 2016 10 No. 10 Modular Machine Tool & Automatic Manufacturing Technique Oct. 2016 1001-2265 2016 10-0012 - 05 DOI 10. 13462 /j. cnki. mmtamt. 2016. 10. 004 * 116024 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 116024 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 0 5-7 8 9-10 1 11-13 2 Multiple Input Multiple OutMIMO 3-4 2015-12 - 17 * 201301002 1960 E - mail myue@ dlut. edu. cn

2016 10 13 50g 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) } 3 227 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 4 2 2 Single Input Multiple OutSIMO MI- MO 1 MIMO MIMO 1 SIMO MIMO 3 SIMO MIMO 2 x y 2. 1 25t YC-3 1 YFF-6 78 X 141 - Y 125kN 2 4. 17PC /N YD-1 2. 3 5 YSV2303 1

14 10 FRF 80Hz 87Hz YSV2303 10 X Y 227 19. 4Hz 5 YSV2303 11 41 16000rpm 300Hz 500Hz 4kHz 8 Frequency Response Function FRF 116Hz 139Hz 151Hz 4 179Hz 2 5 Hz % 1 87. 368 4. 483 Y 2 116. 367 4. 182 X 3 139. 197 3. 430 Y 4 151. 464 2. 906 X 5 179. 005 0. 0893 Y 4 3 3. 1 5 6 227 FRF 0 ~ 160Hz 2 3. 2 5 5 6 1 ~ 5 7 FRF 5 FRF 0 ~ 160Hz

2016 10 15 7 8 3 3 5 M16 Hz % 1 63. 372 5. 849 Y 2 76. 0 6. 341 3 114. 639 6. 784 4 157. 320 3. 097 Y 8 5 25t 6 9 FRF 9 10 4 4 Hz % Y 1 54. 914 6. 214 Z 2 140. 733 3. 466 3 156. 531 1. 181 Y X 4 174. 260 2. 149 10 3. 3 5 Hz 1 2 3 4 5 87 116 139 151 179 63 76 114 157 54 140 156 174 4 MIMO

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