本文采用频响函数矩阵求逆法，辨识了立式机组动态力的幅值谱。
By using inverse matrix of frequency response function in this paper, the spectrum of dynamic forces acting on the set has been identified.
据此幅值谱和一个随机相位谱，并与一个时程包络函数结合，合成一个子震时程。
A time history is synthesized from this amplitude spectrum and a random phase spectrum, combined with an envelope function.
本文的主要贡献如下：1提出了幅值谱和反射对称作为关键帧特征的步态识别算法。
The main contributions of this thesis are summarized as follows: 1 Proposed a method using amplitude spectrum and reflective symmetry of key frames as gait features to recognize test sequence.
在频域内，场地的地震动傅立叶幅值谱，可以表示为震源谱、传播路径影响因子和场地效应的乘积。
The Fourier amplitude spectrum used in a seismological model can be expressed as a product of source spectrum, propagation path factor and site effect in frequency domain.
通过系统响应的时域波形图、幅值谱图、相轨迹图，分析了曲轴轴系的周期、拟周期、混沌等复杂的非线性动力学现象。
The effects of nonlinear damp and rotational speeds on response characteristics of crankshaft system of diesel engine were studied by using numerical integral method.
用数据采集器对磨机的运动参数进行了在线测量，给出加速度曲线和加速度幅值谱图，据此计算出运转过程中的动态载荷均值和变异系数。
The movement parameter of this vibratom is measured on line by a data collector. The acceleration curve and amplitude are obtained to calculate the dynamic load in running.
讨论了脉冲激励幅值以及系统阻尼等对冲击谱的影响规律。
The regular pattern of influence on impact spectra by amplitude of pulse excitation and system damping was discussed.
引入结构屈服水平系数，建立了结构的延性需求谱，使地震动的幅值特性和频谱特性可以分开考虑。
By introducing the yielding level factor and constructing the ductility demand spectrum, the characteristic of peak values and frequency contents of ground motions are considered separately.
从轨道谱的功率谱密度、时间样本幅值及对动力学性能影响的角度，对比了秦沈线轨道谱和德国轨道谱。
The track spectra of Qinhuandao-Shenyang(QS) passenger railway line and German railways were compared in terms of power spectrum density(PSD), amplitude of time domain samples and dynamic performance.
在建立舰船辐射噪声仿真模型的基础上，推导了单、双螺旋桨舰船辐射噪声调制谱谐波族幅值特征的数学期望表达式。
On the basis of building the ship radiated-noise model, the mathematical expectation expressions of ship radiated-noise demodulation spectrum harmonic clan feature were educed.
提出一种以渐进谱为目标谱的生成幅值和频率非平稳地震加速度时程的迭代方法。
Then a new iteration method is developed for generation of random accelerograms non-stationary both in amplitude and frequency which are compatible with target.
压力信号的功率谱密度具有频率波动范围窄、幅值大的特点；
They obey normal distributions. Distributions of power spectral density (PSD) for pressure signal display narrower frequency range and higher amplitude.
并从减小栅栏效应带来的幅值估计误差的角度，设计了一个具有平顶窗谱的窗函数，分析对比了它和矩形窗函数的性能差异。
A window function which has a flat top in frequency domain is designed to correct the amplitude error caused by Picket_Fence effect.
结果表明：随着车速的增加，座椅和地板振动加速度功率谱的幅值有所增加；
The result shows that the vertical accelerations of seat and floor increase with the increase in speed;
与传统的FFT相比极大熵谱法具有频率分辨率高，适于短时瞬态数据处理，而且能给出振动幅值与频率和时间三者的关系。
Compared with traditional FFT method, MESE not only has higher resolution but also fits the processing of transient data, so, it can show the relation of amplitude to both time and frequency.
然而，精确地求解相位、幅值及频率是作全息谱的基础和前提，基于传统DFT方法是不能得到精确的值。
However, the accuracy of phase, amplitude and frequency are basis of the holospectrum. The values are inaccuracy through the traditional DFT.
通过冲击损伤试件的实验分析表明，由于结构损伤的出现压电阻抗谱中的模态频率及其阻抗幅值等特征信息将发生变化。
Experimental results on impact damaged pieces show that the presence of structure damages makes such characteristic information as mode frequency and value of piezoelectric impedance changed.
试验表明，该系统可以获得不同缺陷电容器发生局部放电时放电幅值的时间分布谱图，这为直流局部放电的统计分析和模式识别、判断故障类型和介质老化程度打下了良好的基础。
Through the experiments, the magnitude of PD over time in different capacitors were got, which would be used to recognize the PD patterns and to determine fault types and aging degree.
在次同步谐振发生的时间内，弯振谱图上二倍频成分消失，工频成分的幅值变小。
From frequency diagram of flexural vibration, it is revealed that the vibration amplitude of 1X frequency decreases and that of 2X frequency disappears.
在次同步谐振发生的时间内，弯振谱图上二倍频成分消失，工频成分的幅值变小。
From frequency diagram of flexural vibration, it is revealed that the vibration amplitude of 1X frequency decreases and that of 2X frequency disappears.
应用推荐