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Experimental evaluation of a modal parameter based system identification procedure

机译:基于模态参数的系统识别程序的实验评估

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摘要

Correct modelling of the foundation of a rotor bearing foundation system (RBFS) is an invaluable asset for the balancing and efficient running of turbomachinery. Numerical experiments have shown that a modal parameter based identification approach could be feasible for this purpose but there is a lack of experimental verification of the suitability of such a modal approach for even the simplest systems. In this paper the approach is tested on a simple experimental rig comprising a clamped horizontal bar with lumped masses. It is shown that apart from damping, the proposed approach can identify reasonably accurately the relevant modal parameters of the rig; and that the resulting equivalent system can predict reasonably well the frequency response of the rig. Hence, the proposed approach shows promise but further testing is required, since application to identifying the foundation of an RBFS involves the additional problem of accurately obtaining the force excitation from motion measurements.
机译:对转子轴承基础系统(RBFS)的基础进行正确建模是确保涡轮机械平衡和高效运行的宝贵资产。数值实验表明,基于模态参数的识别方法可用于此目的,但即使是最简单的系统,也缺乏对这种模态方法的适用性的实验验证。在本文中,该方法已在一个简单的实验装置上进行了测试,该装置包括一个夹有质量块的单杠。结果表明,除了阻尼之外,所提出的方法还可以合理准确地识别出钻机的相关模态参数。并且所产生的等效系统可以合理地预测钻机的频率响应。因此,所提出的方法显示出希望,但需要进一步测试,因为应用于识别RBFS的基础涉及从运动测量中准确获取力激励的附加问题。

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