摘要
传统随机振动控制算法中,在全频段采用相同的修正系数对驱动谱进行迭代补偿,控制算法的收敛性受系统频响函数波动特性影响较大。为削弱频响函数的波动特性对驱动谱迭代收敛性的影响,提出将修正系数由实数变为实矩阵,在不同频率取不同修正系数对驱动谱进行迭代补偿,提高算法的收敛速度。取驱动谱迭代的修正系数分别为实数和实矩阵在6自由度液压振动台上进行随机振动试验,试验结果表明,在不同频段取不同迭代步长进行驱动谱修正可以明显提高试验的控制精度。
In classical random vibration control algorithm, the drive power spectral density （PSD） is corrected with the same step size in the whole frequency band. So the fluctuation of frequency response function （FRF） amplitude frequency characteristics of multi-input multi-output system has a great effect on the convergence property of algorithm. The drive PSD correction algorithm with different iteration step sizes at different frequencies is presented to raise the rate of convergence. Random vibration tests are run on the 6-DOF hydraulic vibration table with the conventional drive PSD correction algorithm and the new algorithm respectively. Test results show that the drive PSD correction algorithm with different iteration step sizes in different frequency bands can obviously improve the control precision of test.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第9期215-219,共5页
Journal of Mechanical Engineering
基金
教育部新世纪优秀人才支持计划资助项目(NCET-04-0325)。
关键词
振动台
随机振动
功率谱再现
Vibration table Random vibration Power spectral density replication
