On the Stability of Swept Sine Vibration Control for Electro-hydraulic Shaking Table
The objective of a swept sine vibration test is to check reliability and perdurability of a device under test by imparting a controlled sinusoidal stimulus to it. In order to guarantee higher testing precision, the response spectrum must be accurately controlled. The real-time iteration has been widely applied in engineering filed in that the vibration control system of the shaking table became a closed loop control system. It is found out in practice that there exists the stability problem in the system, which is that the closed loop control system will be unstable when the FRF estimating error is larger or the feedback gain is selected improperly. In this paper, the effect of the FRF estimating error and the feedback gain on the stability of the closed loop control system is analyzed in detail. Firstly, by assuming that this system is a linear time-invariant (LTI) one, a sufficient condition of this system stability is derived using norms and series. Secondly, according to the characteristics of the FRF estimating methods which are usually used in engineering field, the stability condition of this system is quantified, so that a stability criterion for engineering is presented. Finally, a lot of real-time iterative swept sine vibration tests are carried out using a single-axis electro-hydraulic shaking table and the results show that the criterion can be applied to design of the real-time iterative system.
Swept sine vibration control Stability Frequency response function Real-time iteration
Yang Zhidong Cong Dacheng Han Junwei Li Hongren
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang,150080,China
国际会议
北戴河
英文
517-520
2007-06-06（万方平台首次上网日期，不代表论文的发表时间）