1) spectral representation
谐波合成法
1.
In consideration of large computational efforts of Deodatis simulation,a modified spectral representation method was proposed for simulating the fluctuating wind field of long span bridges.
针对现有Deodatis方法模拟大跨度桥梁空间脉动风场中存在的计算量问题,通过对谱分解矩阵引入插值近似,减少谱分解的次数,从而提高该谐波合成法的计算效率,并节省内存花费,实现了对三维空间脉动风场的有效模拟。
2.
A numerical example is undertaken and a comparative study has been performed on the merits and drawbacks of the ARMA representation method and the spectral representation method which is widely used to simulate .
本文将基于线性滤波器的ARMA模型应用于大跨度桥梁的风场模拟,推导出自回归(AR)阶数p和滑动回归(MA)阶数q不等情况下,ARMA模型用于模拟多变量稳态随机过程的公式,将ARMA风场模拟方法与目前广泛应用于大跨度桥梁风场模拟的谐波合成法应用于一座实际大跨度斜拉桥的风场模拟,通过对比研究得出一些有意义的结论,并证实了ARMA法能够在保证模拟精度的前提下,大大提高风场模拟的效率。
3.
A combination of the wave superposition method and the modified spectral representation method is applied to a wind field simulation for whole bridge including the deck and the towers.
将谐波合成法与修正的谱描述法结合用于大跨度桥梁主梁及桥塔上的随机风场模拟。
2) CAWS
[英][kɔ:] [美][kɔ]
谐波合成法
1.
Based on the natural wind properties and the correlativity of nodal winds, CAWS (Constant Amplitude Wave Superposition) is employed to simulate wind speed time series of the Caiyuanba Changjiang Bridge in Chongqing.
基于自然风特性,通过考虑结构节点间的风速时程相关性,采用谐波合成法模拟了重庆菜园坝长江大桥脉动风速时程。
2.
Based on the characteristics of natural winds and the correlativity of wind-speed time histories between simulated points,this paper adopted the method of CAWS(constant amplitude wave superposition) to model after the rib wind-speed time histories of Dashengguan Changjiang Bridge in Nanjing.
基于自然风特性及模拟点间的风速时程相关性,采用谐波合成法模拟了南京大胜关长江大桥的拱肋脉动风速时程。
3) harmonic synthesis method
谐波合成法
1.
Based on the probabilistic characteristics of turbulent wind,the harmonic synthesis method is used to simulate the sample of the level turbulent wind velocity history of a cable-stayed bridge main beam.
基于脉动风的概率特性,采用谐波合成法模拟了某斜拉桥主梁的水平脉动风速时程样本。
4) modified spectral representation
修正谐波合成法
5) improved WAWS
改进谐波合成法
1.
The method for the turbulent wind field simulation on the basis of improved WAWS and buffeting analysis on the basis of mixed programming are adopted.
基于大跨桥梁桥塔抖振时域分析,采用Matlab和ANSYS参数化设计语言(APDL),编写了相应程序和命令流,分析大跨桥梁抖振响应;给出了用改进谐波合成法模拟风场和用混合编程实现抖振分析的方法,在Matlab中实现风场模拟,用ANSYS中的瞬态分析实现抖振时域分析,并应用于湖北鄂东长江公路大桥桥塔抖振分析。
6) weighted amplitude wave superposition (WAWS)
谐波合成
1.
Based on the basic features of fluctuating wind and Davenport wind speed spectrum,in this paper a method to simulate the fluctuating wind field of transmission tower-line system by weighted amplitude wave superposition (WAWS) method which is improved by decimation-in-time fast Fourier transform (DIT-FFT) in time domain is proposed.
文章基于脉动风的基本特性和Davenport风速谱,提出了时域法中基于按时间抽取的快速傅里叶变换技术改进的谐波合成法,然后对输电塔线体系的脉动风场进行了仿真,结果表明,仿真的脉动风速与实际风速一致,仿真的风场符合脉动风的空间相关性规律,计算效率得到了提高。
补充资料：二次谐波交流极谱法
分子式：
CAS号：
性质：由于法拉第电流的非线性性质，它含有基波频率外，还有频率为基波频率，n次倍的n次谐波电流；而充电电流则为线性的，只有基波频率电流。如果只测量通过电解池的高次谐波电流，则可消除充电电流成分，提高法拉第电流对充电电流之比，即信噪比二次谐波交流极谱法测量的是通过电解池的二倍于基波频率的电流。这时充电电流已消除，因而提高了测定的灵敏度。
CAS号：
性质：由于法拉第电流的非线性性质，它含有基波频率外，还有频率为基波频率，n次倍的n次谐波电流；而充电电流则为线性的，只有基波频率电流。如果只测量通过电解池的高次谐波电流，则可消除充电电流成分，提高法拉第电流对充电电流之比，即信噪比二次谐波交流极谱法测量的是通过电解池的二倍于基波频率的电流。这时充电电流已消除，因而提高了测定的灵敏度。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条