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。
However, due to the inherent nonlinearity, complexity and uncertainty of the accurate system, it is usually difficult to obtain an accurate mathematic model.
研究基础位移作用下悬挂弹簧的非线性固有振动问题。
Problems regarding nonlinear natural vibration of pendulum spring under foundation displacement excitation are studied.
开关功率放大器的优势是它具有高效率，但是由于其本身固有的非线性，开关功率放大器的失真通常大于传统的线性放大器。
The advantage of the switching amplifier is the high efficiency, but the distortion is still bigger than the linear amplifier because of the switching working and it's non-linear.
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