... 一阶差分 first order difference 一阶振动 first order vibration 一阶控制 first order control ...
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first order vibration mode 第一阶模态
a first order vibration type 一阶振型
Under the condition of high construction rigidity, its first high order type of vibration was of skipping type which had relatively high inherent frequency, and rather big amplitude.
在高的结构刚度值条件下，其第一高阶振型为跳跃式，有较大的固有频率值，振幅比也大。
The conclusion shows that the calculated results of blade intrinsic vibration frequencies bear no relation to the common fix states for the first seven-order blade vibration.
得到的结论是：对于叶片的前七阶振动，通常的叶片固支状态对叶片自振频率计算值几乎没有影响。
The first-order mode and the first eigenfrequency of the pier can be obtained easily and precisely by the impact vibration test method, from which three indexes such as the chang.
利用冲击振动试验法可以准确得到桥墩的一阶振型和一阶频率，利用这两个参数可以构造出一阶振型比、特征参数、一阶曲率模态差三个指标。
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