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本文辨识了家兔对硝普钠降血压反应的控制用数学模型。实验对象是10只雄性家兔,以TP-801单板计算机驱动输液泵精确地产生一定方式和一定注射率的硝普钠输入。对硝普钠的阶跃、PRBS两种输入方式,分别用图解、解析和递推最小二乘方法,根据血压变化,辨识了家兔硝普钠降压反应的传递函数及ARMAX模型。结果表明家兔硝普钠降压反应的传递函数是一阶纯滞后惯性环节:G(S)=-1.02e~(-26.26S)/(1+56.50S),ARMAX模型是:Y-t=a_1y_(t-i)+b_0u_(t_m)+b_1u_(t-m-1)+y_d。模型的线性范围是0-30μg/kg.min。这些模型的参数值与国外对人硝普钠降压反应的辨识结果相一致。
This article identified a rabbit model of hypotensive control of sodium nitroprusside. The experiment was performed on 10 male rabbits. The TP-801 single-board computer-driven infusion pump accurately produced sodium nitroprusside at a certain rate and at a certain injection rate. On the step of nitroprusside and PRBS, the transfer function and ARMAX model of the hypotensive response of sodium nitroprusside in rabbits were identified by the methods of graphic, analytical and recursive least squares respectively. The results show that the transfer function of sodium nitroprusside is a first-order pure hysteresis inertial link: G (S) = - 1.02e ~ (-26.26S) / (1 + 56.50S). The ARMAX model is Yt = a_1y_ (ti) + b_0u_ (t_m) + b_1u_ (tm-1) + y_d. The linear range of the model is 0-30 μg / kg.min. The values of these models are in agreement with the identification results of hypotensive reactions of sodium nitroprusside in foreign countries.