结构的振动测试中，正确识别结构的低阶频率和振型尤为重要。
It's important to recognize the low-order frequencies and modes of vibration in the course of structural dynamic measurement.
在工作状态下，转速对低阶频率的影响大，对高阶频率的影响则比较小。
Under operating condition, the effect of rotor speed on low-order frequencies is stronger than that on high-order frequencies.
一个典型结构可能有数百个振动模态，但通常我们只对少数低阶频率对应的模态感兴趣。
There may be hundreds of potential vibration modes in a typical structure, but usually, it is only a small number of vibration modes with the lowest frequencies that are of interest.
低阶锁相环跟踪频率斜升信号时产生的稳态相差致使环路失锁，接收机无法锁定载波信号。
Due to steady phase error, low-order PLL has a trouble in tracking frequency ramp signals, so that the receiver cannot lock carrier signals.
进而利用比较成熟的结构分析软件ANSYS对管系进行了模态分析，得到系统的低阶固有频率和振型。
The mode analysis was processed with current structure analysis software ANSYS. The lower natural frequency and vibrant model were counted.
结果表明，考虑随机几何缺陷后，系统的低阶固有频率将降低，内力阵风响应因子将升高。
It is shown that, the basic natural frequency will decrease and the internal force response factor will increase if the random geometric imperfections are taken into consideration.
由于箱式浮体结构的低阶固有频率很低，相应的弹性振型的响应与刚体运动耦合，结构在波浪中没有发现明显的低阶弹性模态谐振。
No significant resonance of the low flexible body modes is found due to the coupling of the responses among these modes and the rigid body modes.
本文用有限元素法建立织编机机架的力学模型，并计算了机架的低阶固有频率及相应的振型。
The natural modes and frequencies of the framework of a knit-weaving machine are determined and its mechanic model established on the basis of finite element method.
考虑单模态振形，得到了相应于最低阶特征频率的幅频关系和受谐和激励的幅频响应。
The amplitude-frequency relation with respect to the natural frequency of the lowest order and amplitude-frequency response under harv monic force were obtained by considering single mode vibration.
为了提高结构的动态刚度，可通过修改直线滚动导轨的结构，使低阶模态频率相应提高。
The dynamic characteristic of linear rolling guide affected by modal frequency and modal shape was studied.
以提高低阶固有频率作为动态优化目标函数，对主轴系统进行了优化设计。
The elevation of the shafting system at low-lying step mode acting as an appraisal function, the optimal design of the shafting system was given.
本文将离心机转鼓视为一端固支、一端自由的薄壁圆筒，用瑞利能量法推导其最低阶固有频率，所得结果具有工程运算所需精度。
Treating a bowl of centrifuge as a clamped-free thin-walled cylinder, fromulas to calculate natural freguency are given by using Rayleigh's energy method.
给出了在各种不同大气湍流强度、不同相位谱空间频率的下降因子时，大气湍流相位波前低阶模式完全校正后和倾斜部分校正时的斯特列尔比的计算结果。
The results of Strehl ration calculation after low-order modes and tilt part correction at varies atmospheric turbulent intensity and phase spectrum descend efficiency are discussed detailed.
通过计算得到前十阶固有频率，并分析了低阶固有模态振型。
Ten orders 'natural frequencies had been calculated and low-order vibration shape of the body structure was studied.
通过计算得到前十阶固有频率，并分析了低阶固有模态振型。
Ten orders 'natural frequencies had been calculated and low-order vibration shape of the body structure was studied.
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