【摘要】 转盘振动对精密离心机精度有重要影响,但目前尚无有效手段测试转盘在旋转状态下的微振动响应。在理论分析的基础上,提出转盘振动响应预测的方法。通过模态测试获得精密离心机基础与转盘上若干点之间的频响函数,进一步计算响应传递率,并结合基础振动响应测试数据,对转盘在旋转状态下的振动响应进行预测。分析结果表明:转盘振动响应放大的主要因素是气浮轴承的动力学特性;转盘振动总体上表现为随机振动,周期振动的分量相对较小。更多还原

【Abstract】 Turntable vibration has an important influence on the accuracy of precision centrifuge. However, there is currently no effective means to measure the micro-vibration response of the rotating turntable. In this paper, a method to predict the turntable vibration was put forward based on theoretical analysis. First of all, the frequency response functions at different points on the turntable and the centrifuge foundation were tested. Then, the transfer rate was calculated and analyzed. Finally, the turntable vibration was predicted according to the transfer rate and the measurement result of the foundation vibration. Analysis result shows that the turntable vibration is dominated by the random vibration with small periodic vibration components, and the dynamics characteristic of the air-bearing is the main reason to amplify the turntable vibration.更多还原