FrF

Professional , it is specified in design for FRF system .

专业性强，专门针对抗燃油系统而设计。

FRF Matrix Measurement During Multiple Sinusoidal Vibration Response Controlling

多点简谐振动响应控制下的频响矩阵测试

FRF Method of Computation Model Adjustment

计算模型修正的频率响应函数方法

A method is presented for FRF matrix measurement when multiple sinusoidal vibration response is controlled .

探讨了一种多点简谐振动响应受到控制时的频响矩阵测试方法；

Therefore , the derrick damage identification method based on principal component analysis and FRF is put forward .

为此，提出了基于主元分析法和FRF的井架损伤识别方法。

A structures damage identification method based on frequency response function ( FRF ) and PCA was presented .

提出了基于加速度频响函数和主成分分析的结构损伤识别万法。

Dynamic condensation based on FRF and least-squares fit for complex modes with damped oscillation system

用频响函数和最小二乘法建立有阻尼振动系统的动态聚缩模型

Updating Finite Element Model of Cabin with Floating Raft through Sensitivity Analysis of FRF Correlation Coefficient

基于频响函数相关系数灵敏度的浮筏舱段有限元模型修正

For the amount of FRF is very large , it is impossible to use them directly .

但是由于FRF本身所包含的数据量很大，不可能直接应用。

With the function of regeneration , and can bring down the acid number of FRF efficiently .

具有再生功能，有效降低抗燃油酸度。

FRF is easily obtained through the response measurements and can be dramatically reflected the structural dynamic characteristics .

频响函数易于通过结构的动力试验测试得到并包含了大量的结构动力特性。

Two algorithms based on common denominator and left matrix fraction description are presented according to parametric model of FRF .

根据频响函数所采用参数模型，分别实现了基于公分母模型与基于左矩阵分式模型的两种识别方法。

Example testing shows the effects of FRF matrix measurement method and the control results of response magnitude and phase are all satisfied .

试验研究表明该方法的有效性，而且响应的幅值和相位控制均满足试验的要求。

An eigenvalue problem is established based on the relationship between columns in the frequency response function ( FRF ) matrix of the structure .

利用结构频响函数矩阵各列间的关系建立起一个特征值问题，从其特征向量中可求结构模态复频率和复模态向量。

By vibration experiment , FRF of mechanical system be measured , modal parameters of modal orders be identified in modal analysis theory .

通过振动试验，提取系统的频晌函数，用模态分析理论识别系统的各阶模态参数，再进一步就可研究系统的动力学性能。

Based on the theory of series expansion , a Series Expansion Method ( SEM ) for Frequency Response Function ( FRF ) is developed .

运用级数展开原理，导出了频响函数计算的级数展开法。

Frequency Response Function ( FRF ) matrix is used as a mathematical model between inputs and outputs in the multidimensional vibration system .

应用频响矩阵建立了多维振动系统输入输出之间的数学模型。

Results show that curvature of the FRF is very sensitive to the damage and can be used as an excellent indicator .

结果表明：频响函数的曲率对损伤非常敏感，不仅反映出了损伤位置，而且能够表示损伤程度。

This paper presents a synthesized model updating method using the modal parameters and frequency response functions ( FRF ) extracted from the vibration test data .

文章提出了一种利用模态参数和由振动试验数据求得的频响函数来进行模型修正的方法。

This method uses right matrix fraction description model of FRF in discrete time domain . The noise covariance matrix is adopted as weighting function .

该方法采用离散时间域中频响函数右矩阵分式模型，使用噪声的协方差矩阵作为加权信息。

According to the same expression between positive power spectral density and FRF , EMA algorithms can be applicable for ambient excitation .

根据半功率谱密度与频响函数之间的相似数学表达式，因此将EMA方法用于环境激励下的模态参数识别。

The general theory and practical techniques for multiple random input estimation of FRF are studied based on the finite Fourier transform and least square fitting .

本文以有限富氏变换为基础，讨论了多点随机激励频响函数估计的一般原理和各种可能的激励方案。

In this thesis , FRF were reconstructed using principal component analysis , and the influence of original data noise was reduced or eliminated . 3 .

本文利用主成分分析对频响函数对频响函数进行重构，减少或者消除原始信号中噪声的影响。

Ion exchange resin is a new type FRF processing technology , whose capacity is7 times higher than diatomite and it can decompose phosphate .

离子交换树脂是最新的抗燃油处理技术，其处理酸的能力是硅藻土的7倍，并且对已经存在的磷酸金属盐有分解作用。

If the test data is a short data sequence , it is not suitable to perform conventional nonparametric estimation of frequency response function ( FRF ) .

针对传统的非参数频响函数估计方法不适用于短记录数据的情况，提出了一种基于公分母模型的参数化频响函数估计方法。

Based on the theory of modal superposition and power series expansion , a modal superposition method for the sensitivity analysis of FRF is proposed in this paper .

基于模态展开和幂级数展开原理，提出了一种频响函数灵敏度分析的模态展开法。

A sinusoidal vibration control algorithm is also presented , and a criterion using the real-time response signals is set forth to check the precision of FRF matrix measurement .

给出简谐振动响应控制的算法流程，并用实测的响应信号对频响矩阵精度进行评价。

It is very important to calculate the sensitivities of the Frequency Response Function ( FRF ) in the areas of vibration control , structural optimization and so on .

响函数灵敏度分析在结构动力优化和振动控制等许多领域中有着广泛的应用。

Fast Fourier Translation and FRF of impulse function are applied to research the transverse seismic response of shield tunnel , with step-by-step integral procedure being compared .

采用频域的方法，利用脉冲波的频响函数，计算了武汉长江隧道横断面在地震荷载作用下的动力响应，并与逐步积分法进行了比较。

The common Frequency Deconvolution Method ( FDM ) to address this problem can be invalid because of the ill-conditioned structural frequency response function ( FRF ) .

由于结构频响函数往往是病态矩阵，常用的频域反卷积法会失效。