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着重研究超声波发声系统中压电结构的状态空间模型构建和相应的控制策略。通过压电换能器的振动模型和匹配电路模型类比,使得压电振动状态可通过检测压电工作电流得到,同时可以得到控制系统的微分方程模型。考虑系统的各种干扰,根据线性分式变换(LFT)将系统微分方程模型转变为系统状态空间模型。通过得到的状态空间模型整理变形,将系统的各个干扰整合,笼统的视为一项系统扰动,得到含扰动的状态空间模型,并基于此,采用L2干扰抑制控制策略。最后仿真结果显示系统运行状态好。
Emphasis is placed on the construction of state space model and corresponding control strategy of piezoelectric structure in ultrasonic sounding system. Through the piezoelectric transducer vibration model and matching circuit model analogy, so that the piezoelectric vibration state can be obtained by detecting the piezoelectric current, at the same time be able to control system differential equation model. Considering various kinds of system disturbances, the system differential equation model is transformed into the system state space model according to linear fractional transformation (LFT). Through the deformation of the state space model obtained, the system integrates the various disturbances, generally as a system disturbance, and obtains the state space model with disturbance. Based on this, the L2 interference suppression control strategy is adopted. The final simulation results show that the system is in good condition.