Supposing that the reference trajectory is generated by a stable system, the bounded solution of non hyperbolic internal dynamics is existed by using center manifold theory.
假设期望轨迹由某一稳定外部系统产生，利用中心流形的理论，证明了系统内部动态有界解是存在的。
Supposing that the condition of diffusive sound field is known, a method to handle room sound field is given to avoid the complicated mathematical derivation, using system theory and statistics.
在扩散声场假设条件下，采用系统学、统计学等方法来处理室内声场，避免了繁杂的数学推导。
For a sea-floor transient electromagnetic exploration system, its maximum transmitting frequency may be chosen as 200 Hz by supposing the sea-floor as horizontal thin conductive plates.
可控源时间域电磁法应用在海底探测，需要确定装置参数，通过实验和理论计算确定了发射频率的最大值；
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