However, due to the inherent nonlinearity, complexity and uncertainty of the accurate system, it is usually difficult to obtain an accurate mathematic model.
由于实际系统固有的非线性、复杂性及不确定性，建立系统的模型通常是困难的。
BP network with the strong nonlinearity mapping ability can summarize the rule from acquired data to obtain the inherent laws of these data automatically.
BP网络具有很强的非线性映射能力，能从已有数据中自动地归纳规则，获得这些数据的内在规律。
Due to the inherent hysteretic nonlinearity, the giant magnetostrictive actuator (GMA) can cause position error in the open-loop systems, and cause instability in the closed-loop systems.
由于内在的滞回非线性，超磁致伸缩驱动器(GMA)会在开环系统中引起定位误差，在闭环系统中造成系统不稳定。
Due to the inherent hysteretic nonlinearity, the giant magnetostrictive actuator (GMA) can cause position error in the open-loop systems, and cause instability in the closed-loop systems.
由于内在的滞回非线性，超磁致伸缩驱动器(GMA)会在开环系统中引起定位误差，在闭环系统中造成系统不稳定。
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