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Discrete wavelet transform based multi-degree of freedom of non-stationary random response of structures calculated


risonbe-tweentheresultsofMonte-Carlomethodandthemethodpresentedinthispapershowsthatthe1 Keywords {non-stationaryrandomvibration; stochasticresponse} discretewavelettransform first ashamed by FAN Jian men. PhD, lecturer, born in 1969 Phone: (027) 87548416; E-mail: zyp2817 @ hum. edu. cn 14 No. 4 December 2001 Vibration Engineering VO. I1N04D. ! N01 flexible structure of system uncertainty Guihai Ping Xi-Zhi Zhang Liang (Shanghai Jiaotong University, vibration, shock and noise of the State Key Laboratory of Shanghai .200030) Abstract A flexible structure system uncertainty structured singular value () method of the structure of the system is not built high touch dynamic. The name of the model will be added as a type of factor or addition and multiplication factor of uncertainty. Well sampan blog space model parameter perturbation is deduced model of the system parameter uncertainties using structured singular value () method on the structural system and its controller, robust stability and robust performance analysis. Sad that the operator is given. This flexible model of uncertainty Results dig construction method and control system analysis method is effective. Key words: flexible structure vibration control nobelium {I {{model uncertainty robust control in the ring Key words: TU352 flexible structure system modeling process,[link widoczny dla zalogowanych], is always a variety of modeling errors inevitably exist. The earliest of model uncertainty on the impact of active vibration control is M. J. BaLas]], he pointed out that due to the observation mode truncation overflow and closed loop control system may cause spillover instability. Hyland,[link widoczny dla zalogowanych], who also pointed out the system identification of large flexible space structures modeling error is inevitable, model uncertainty analysis and the system controller robust stability and robust performance attracted attention. In this paper, the flexible structure model uncertainty structured singular value () method. analyze the structure of the system frequency unmodeled dynamics, as the name of the model by adding additional type of factor or uncertainty factor, modal space parameters from the perturbation start. derived uncertainty model parameters of the system. If using structured singular value () Analysis of the structural system and its controller for robust stability and robust performance analysis. given examples show that the structure of this construction method of system uncertainty analysis and control system is effective one flexible structure state space model of the system by the modal superposition method shows a linear response of structural system can be expressed as (f):: q () (Well) (1) l where () is the structure of the response, port, (f) is the modal coordinates, O7) is the mode shape, is the location coordinates, in the project, the general results with the modal truncation method, take, _ order modes National Key Laboratory of base stack-funded project 'Code: JS520.3 Received Date :2000-06-07; revised the date of receipt: 2000 a lO08 state, the structure of the response to (); Σq ,()()( 2) However, the large modal demanding,, _ This generally high scores, even hundreds, to design the controller so high it is very difficult to be re-used method of modal truncation, design low-level controller, because there is damping, higher order modes would be She quickly decay, which is actually the basic character sets. usually the order of the controller is taken as N, N ≤ L Thus,[link widoczny dla zalogowanych], by changing the mode coordinates, the structure of linear time-invariant system where the state equation of the form + wind. (3] in which a (.-, q,[link widoczny dla zalogowanych], q i,[link widoczny dla zalogowanych]! I, () ... (). ... ojA Ⅳ a d 【ag (name, ...,), = diag (~ 1, ..., name) t is the damping factor, m is the number of actuators for the actuator of a position,

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