频率函数

In order to optimizing the vibration isolation of some diesel generator set ,an analysis of the vibration character and excitation forces of it is presented through theory study and vibration testing.

通过对频响函数的测试，获得了某型柴油发电机组隔振系统各阶刚体模态频率和弹性模态频率，分析了该机组振源和振动特点。

The correlation theory is proposed to calculate phase difference and designed in frequency tracking. A promoted method for the initial measurement of CMF's signal processing is based on the Chirp Z Transform application. The result of simulation has proved that the techniques above are feasible.

应用DFT方法处理科氏流量计的信号是DSP算法的基础，本文除了详细介绍其实现过程，还提出了利用相关函数计算相位差和解决频率跟踪算法中的关键技术以及利用线性调频Z变换实现频率初始化测量的新技术。

With the frequency and mode shape being regarded as functions of damage parameters, the overdetermined algebraic equations with damage parameters as unknowns can then be constructed by differentiating frequency and mode function on the basis of structure mode finite element formula, the damage parameters of which are obtained via Taylor expansion.

本方法从结构模态有限元算式出发，把频率和振型看作损伤参数的函数，经过泰勒展开获得频率、振型对损伤参数的一阶偏导数，然后构造以损伤参数为未知量的超定线代方程组，求解得到全部损伤参数值。

With the frequency and mode shape being regarded as functions of damage parameters, the overdetermined algebraic equations with damage parameters as unknowns can then be constructed by differentiating frequency and mode function on the basis of structure mode finite element formula, the damage parameters of which are obtained via Taylor expansion. The whole damage parameters can be found via solving the algebraic equations.

本方法从结构模态有限元算式出发，把频率和振型看作损伤参数的函数，经过泰勒展开获得频率、振型对损伤参数的一阶偏导数，然后构造以损伤参数为未知量的超定线代方程组，求解得到全部损伤参数值。

From point of view of Fourier theory, an optical system behaves as a low-pass filter which debars spatial frequency information about the object beyond the diffraction limit cut-off frequency.

按照傅立叶光学的观点光学系统是一个低通滤波器，其传递函数在由衍射极限分辨力所决定的截止频率以上值均为零，因此图像截止频率以上的能量和信息被丢失。

The experimental results of the two models of the brick house with arch floor whose rise to span ratio is 1/10 and 1/6 respectively are given in this paper, and then a mechanical model with clastic support for the whole model house is established, its displacement response is analyzed by using frequency response function method, a corresponding frequency response function is derived, and model stiffness parameter for different stages is discussed.

本文给出了矢跨比分别为1/10和1/6的两幢二层砖拱楼盖房屋模型的振动台试验结果。对整个模型房屋建立了弹性支承杆系力学模型，用频率响应法分析了模型的位移反应，导出了相应的频率响应函数，并对各阶段的模型刚度参数进行了讨论。

Then based on CWMS, we propose a new method to enhance the resolution of seismic traces. Firstly, we divide the seismic signal into proper segments by Gabor molecule-windows adaptive to the signal, where each segment is regarded stationary, and then transform it into the Gabor domain. Secondly, we deal with the amplitude spectrum for each segment to expand the frequency band of the spectrum in the Gabor domain. Finally, taking inverse Gabor transform on modified time-frequency coefficients, we get the high-resolution signal.

然后基于变子波模型，提出了一种新的提高地震记录分辨率的方法：第一步，用自适应于地震记录的Gabor分子窗把地震记录恰当地划分成若干片断，每段内信号近似平稳，然后将地震记录变换到时间-频率域；第二步，在变换域对每个分子窗内信号的振幅谱进行处理以拓宽频带；最后把处理后的时间-频率域函数反变换回时间域得到提高分辨率后的结果。

A mixed sensitivity H∞ control model is constructed and the band width of wind turbine speed control is designed according to the frequency characteristic of wind speed variation and noise of rotating speed sensor. The sensitivity function is decreased within this frequency band to restrain the wind torque perturbation to wind turbine rotating speed control.

通过构造基于复合灵敏度的H∞鲁棒控制模型，根据风速的波动频率范围和传感器的噪声频率范围设计了风车转速控制的带宽，并在此带宽内降低系统的灵敏度函数，来抑制风力转矩对风车转速控制的干扰。

The frequency response function and frequency domain expression of torsional vibration velocity at a point on pile top are obtained.

得到桩顶某点扭转振动速度的频率响应函数和频率域表达式。

A design of temperature sensor with differential output is given, and its sensitivity as the function of temperature is analyzed theoretically and simulated. The theoretical model of response characteristic of viscous damping microbeam system under periodically driven force is built.

在此基础上，进一步从理论上分析了残存应力对微桥固有频率的影响，推导了微桥固有频率同温度的函数关系，提出了一种差动式谐振温度传感器的设计构想，并对其灵敏度随温度的变化进行了理论分析和模拟计算。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。