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| THE VIBRATION TEST AND ANALYSIS OF THE VIBRATION REDUCTION SYSTEM FOR AIRBORNE GRAVITY |
| QU Jin-hong, ZHOU Xi-hua, LI Bing, WANG Zhi-bo, QIAO Yang |
| China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China |
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Abstract In the survey of the airborne gravity system, high frequency vibration caused by aircraft engine and airborne environment affects the precision of airborne gravity system measurement seriously, and this problem could be solved by the method of vibration reduction system. Therefore, the suppression effect of vibration reduction system and its modal parameters (natural frequency, damping ratio and model shape) constitute the very important basis of the structural design and evaluation of the vibration reduction system. Aimed at solving the problems existent in the airborne gravity vibration reduction system, the authors made several vibration tests, and the result shows that the natural frequency can avoid the periodic vibration frequency of aircraft engine. In the frequency band of 100—500 Hz, the vibration transmissibility for the measuring point 1 is from -18 to -38 dB, and the vibration reduction effect is quite obvious.
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Received: 29 November 2011
Published: 10 December 2012
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