The set of formulas consists of DFT of sampled data, phase difference calculation and frequency calculation.
频率估计公式包括采样序列DFT、相位差计算和频率计算。
The FEM and measured results validated the accuracy of this model in frequency calculation of piezoceramic elements.
有限元计算和试验测量结果验证了这一模型对压电振子频率计算的准确性。
Also an approach formula for frequency calculation is obtained by taking the quasi-vibrational mode as a generalized coordinate and by virtue of the Hamilton's principle.
最后本文以准振型为广义座标，以哈密顿原理为手段，得出了频率计算的近似方程。
The vortices shedding frequency calculation model proposed by this paper can be used to predict the shedding frequency of the Karman vortices for hydraulic turbines design.
本文建立的水轮机固定导叶和活动导叶后卡门涡频率预估模型，可在设计阶段进行叶片绕流卡门涡频率的预估。
The integral period sampling, which is realized by realtime frequency calculation and voltage capture function of IC chip, is necessary for precise digital signal processing.
借助芯片的捕获功能，计算信号的实时频率，实现了整周期采样，保证了数字信号处理的精度。
Due to errors of hydrological frequency calculation, the deviation between the estimated value and actual value causes the design of water conservancy projects to be insecure.
在水文频率计算中由于误差的存在，使得估计值与实际值之间存在偏差，这种偏差导致在水利工程设计中产生了不安全因素。
The spectral leakage caused by the truncated signals results in frequency calculation error and slows frequency tracking. A Hanning windowed recursive DFT method is introduced.
但由于截断信号会产生频谱泄漏，使得相位和频率计算结果有一定误差，采用该方法跟踪频率，实时计算电网变化的频率速度较慢。
The regional differences of water condition in the typical sand regions are analyzed from the aspects of the time space change and the frequency calculation of annual precipitation.
从年降水量的时空变化、频率计算等方面，分析了本区水分条件的地区差异。
This paper presents calculation of frequency and phase difference of flow signals with spectrum analysis on basics of Fourier transform (DFT).
本文采用基于傅立叶变换(DFT)的频谱分析方法，计算流量信号的频率和相位差。
A design method for low phase noise agile X-band frequency synthesizer is presented, the theoretic analysis and calculation is performed and the test results are given.
介绍一种低相噪、捷变频x波段频率综合器设计方法，并进行理论分析、计算，最后给出测试结果。
The low frequency exhaust noise of a diesel(4 85), its generation, frequency characteristics and influencing factors have been studied through theoretic calculation, analysis and experiment.
针对柴油机（4 85 ）低频排气噪声，对其产生机理、规律及其影响因素等作了理论计算、分析及实验。
Inherency frequency of servomechanism is to have an influence on the key parameters of servo accuracy and response capability, and demands the calculation of inherency frequency in the design stage.
伺服机构固有频率是影响伺服系统伺服精度、响应能力的重要参数，在设计阶段就需要对伺服机构的固有频率进行计算。
In this model, running state of transmission line is divided into four states, and calculation method of state probability, state frequency and state duration in balanced state are given.
该模型将输电线路的运行状态划分为四种状态，给出了每种平稳状态的状态概率、状态频率和状态持续时间的计算方法。
But compare with FFT, the calculation time needed by the multiple frequency rotate transform is very long, which has influenced its wide application to a certain extent.
但是，与快速傅立叶变换相比，倍频旋转变换理论所需要的计算时间很长，这在一定程度上影响了它的广泛应用。
The SPLL consists of calculation frequency error, updating loop middle variable, and output control signal.
该锁相环由计算频率误差、更新环路中间变量、输出控制信号组成。
This algorithm needs shorter data window time and has higher calculation precision and is not affected by deviation of power frequency.
这种算法具有所需数据窗的时间短、计算精度高和不受系统频率偏差影响的优点。
The keys of improving the ATCXO temperature frequency characteristic are appropriately choosing compensation network and optimization calculation the network parameter.
补偿网络的合理选取和网络参数的优化计算是提高ATCXO产品的温度频率特性的关键。
Aiming at the fracture problem of the square plansifter with 8 cells, the calculation for nature frequency and dynamic response of this structure is completed.
针对8仓高方平筛的断裂问题进行了固有频率和动力响应计算，在对计算结果分析的基础上，提出了两种结构改进方案，并对改进结构又进行了计算验证。
By the combination of frequency characteristic analysis and quantitative calculation, its physical concept is clear, and the PSS parameter has strong adaptability after adjusted.
采用频率特性分析及数值计算相结合，物理概念清晰，使调整后的PSS参数有很强的适应性。
In this article, a calculation method is put forward for free vibration frequency of a pipe which contains flow fluid.
本文提出了对包含有流动流体的管道自由振动频率的一个计算方法。
The kinetic parameters in the models, including pseudo activation energy and apparent frequency factor were obtained by using Monte Carlo numerical calculation method.
利用随机试验法等数值计算方法求得了模型中的表观活化能和视频率因子等动力学参数。
Via calculation we find the contribution of the frequency in the vapor term to the refractivity can not be neglected.
计算发现，水气项中的频率改正对折射率差的贡献是不可忽略的。
The conception of transient frequency and calculation method of wavelet packet are introduced, and time frequency distribution about simulation and actual seismic signals is given.
介绍了瞬时频率的概念和瞬态谱的小波包计算方法，并结合时间域模拟信号给出了其时频分布。
It can be seen that the frequency curve calculation is basically reasonable and show the estimation of "1482 flood" return period is rational after putting palaeofloods into flood series.
把古洪水加入到洪水系列后进行频率计算，可以看出频率曲线基本合理，说明对1482年洪水重现期的判断是合理的。
Frequency changer by means of electric current for calculation limitation.
因变频器以电流为计算限制。
This paper gives two kinds of calculation methods of natural frequency of a mass-even elliptic column which oscillates in miniamplitude on a plane, obtains two formulas of natural frequency.
本文给出了匀质椭圆柱体在平面上作无滑动的微幅摆动之固有频率的两种计算方法，得到两个固有频率的计算公式。
Frequency characteristics calculation of the digital closed loop FOG was conducted based on error analysis between the transfer function and the model.
分析传递函数与FOG模型的误差，得出数字闭环FOG频率特性的计算方法。
Matrix step is low by using the finite element transfer matrix method. Natural frequency by calculation approaches to actual natural frequency and the error is allowable.
用有限元传递矩阵法分析火炮身管固有振动特性，矩阵阶次低，计算所得的固有频率与实际固有频率接近，误差在允许的范围内。
Matrix step is low by using the finite element transfer matrix method. Natural frequency by calculation approaches to actual natural frequency and the error is allowable.
用有限元传递矩阵法分析火炮身管固有振动特性，矩阵阶次低，计算所得的固有频率与实际固有频率接近，误差在允许的范围内。
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