在模拟地震试验前和各阶段模拟地震试验后均对模型进行了白噪声扫描试验，考察了模型的频率变化规律。
The white noise scanning test was conducted before the shaking table test and repeated at every interval of each test to obtain the law of the basic frequency vary with the time.
在该系统应用于临床前，有必要对其进行理论建模、特性分析和模拟试验研究。
Before clinical application of the system, it is necessary to carry out theoretical modeling, performance analysis and simulated experimental study.
为描述进水口前立轴旋涡多圈螺旋的流场特性，运用数值模拟、试验研究和理论公式3种方法。
The flow field characteristics of vertical vortex with multi-circle spiral flow at hydraulic intakes are described by numerical simulation, experimental investigation, and theoretical equations.
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