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1)  random decrement technique
随机减量法
1.
Application of random decrement technique for model parameter identification about locomotive and vehicle wheelsets;
随机减量法在机车车辆轮对系统模态参数识别中的应用
2.
In view of the feature of flight flutter test data with atmospheric turbulence excitation, a method which combines wavelet transformation with random decrement technique for identifying flight flutter modal parameters is presented.
针对基于大气紊流激励的飞机颤振试验数据具有信噪比低以及测量数据以加速度响应形式给出等特点,将小波变换与随机减量法相结合对飞机颤振模态参数进行识别,首先利用随机减量法获得结构在非零初始加速度条件下的自由衰减响应,然后对该自由衰减响应进行Morlet连续小波变换,为使变换简单,本文采用了Parseval定理和留数定理,利用Morlet的带通滤波特性,通过搜索小波变换系数在不同的尺度区域内的极大值,再根据小波变换系数的极大值、相角与固有振动频率及阻尼系数间的关系,即可识别出各模态参数。
3.
Vibrationg acceleration of CW-200 bogie frame is measured on real line and modal parameter of frame is identified by random decrement technique.
随机减量法是一种随机激扰下的模态参数识别方法。
2)  random decrement method
随机减量法
1.
This paper introduced stratified sampling,and applied it to random decrement methods,which lead to good results.
该文将抽样技术应用于随机减量法中随机振动信号的提取,在一定程度上解决了随机信号段数不足的问题,明显改善随机减量信号的质量。
2.
The theoretical basis to estimate nonlinear roll damping with the random decrement method is investigated by analyzing the test data of a model ship rolling in regular and irregular waves, and problems arising from the data processing are discussed.
通过对规则波中和不规则波中横摇衰减试验以确定非线性横摇阻尼的数据分析 ,研究了对大幅横摇随机讯号采用随机减量法确定非线性阻尼方法的理论依据 。
3.
This research addresses the application problem of multi-stage sampling on random decrement method for parameter identification of a dynamic system.
本文将多阶段抽样技术应用于随机减量法中随机减量信号的提取,用以解决结构振动参数识别中计算量比较大的问题。
3)  random decrement technique
随机减量
1.
Some orders of vibration mode parameters were identified by using the frequent-domain peak-picking method,the time-domain stochastic subspace parameter identification method and random decrement technique.
4 m高的超高索塔在施工阶段独立状态下的环境振动试验,采用峰值法、随机子空间法及随机减量法识别得到索塔多阶振动模态参数。
4)  random decrement
随机减量
1.
On-line monitoring of suspension bridges using the GPS and the random decrement technique;
用GPS和随机减量技术对悬索桥实时监测
2.
In this paper,the study of applying the method of the random decrement and the Ibrahim Time Domain (ITD) to the field of internal combustion engine is done through the vibration modal analysis of the engine s oil pan,the result may be relived.
进行发动机油底壳实验振动模态分析 ,对随机减量技术及 ITD法在内燃机领域的应用展开了一些研究 ,其结果具有可信性。
5)  improved random decrement technique
改进的随机减量法
1.
Based on the displacement and acceleration data of an aeroelastic wind tunnel test of the Geiger type cable dome model,empirical mode decomposition method,improved random decrement technique and Hilbert transformation are combined to identify the aerodynamic damping,and the results comfirm that the method is simple,stable and effective.
基于肋环型索穹顶结构气弹模型风洞试验结构位移及加速度时程数据,联合采用经验模态分解法、改进的随机减量法及H ilbert变换来识别结构的气动阻尼,计算结果表明该方法简便、稳定、有效。
2.
Based on the data of wind tunnel test of aeroelastic Geiger cable dome model,the method of empirical mode decomposition is used to distill the intrinsic mode function,then the improved random decrement technique and Hilbert transformation are used to get the aerodynamic damping ratio,and the result shows that this kind of method is stable and effctive.
利用肋环型索穹顶结构气弹模型风洞实验的数据,先由经验模态分解法提取信号的低频分量,并在此基础上采用改进的随机减量法及Hilbert变换得到结构的气动阻尼,结果证明该方法是稳定而有效的。
6)  random decrement technique
随机减量技术
1.
Modal parameter identification of large bridge based on the EMD and random decrement technique;
基于EMD和随机减量技术的大型桥梁模态参数识别
2.
Operating modal parameter identification by random decrement technique and ibrahim time domain;
用随机减量技术及ITD法识别工作模态参数
3.
Modal parameters are identified by random decrement technique and ITD method.
提出了一种适合于网壳结构的损伤分区定位方法,该方法对网壳结构进行区域划分并按区布置传感器,通过单点激励得到结构的高阶模态响应,利用随机减量技术和ITD法获取模态参数,再利用损伤前后高阶振型的差值来定位损伤区域。
补充资料:随机量
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性质:即具有随机涨落性质的量。如放射源的计数率,每分钟测得的计数量是不相同的,不均匀的,一般用多次测量结果的算术平均值来表示其计数率。同样也需了解观测值围绕平均值的分布情况。

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