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first order mode shape
相关语句
  第一阶振型
     Vibration mode analysis is by using commercial finite element software, and the analysis shows the sensitivity of the change ratio of the first order mode shape to the location and severity of structure damages.
     应用有限元程序进行模态分析,模态分析的结果表明第一阶振型改变率对不同位置和程度损伤的敏感性。
短句来源
     Hereby, the change ratio of the first order mode shape is presented as the indicator for structure damage detection.
     提出以第一阶振型改变率作为结构损伤识别的标识量。
短句来源
  “first order mode shape”译为未确定词的双语例句
     and then, based on the results obtained from the sensitivity analysis, only changes in slopes of the first order mode shape are used to locate damage;
     然后结合敏感性分析的结果,仅利用结构一阶振型斜率的改变确定损伤位置;
短句来源
     2) The damage location method based on only changes in slopes of first order mode shape has been presented, that is to say, the change in slope of first order mode shape of the damaged storey must be greater than zero when only one storey is damaged. The above conclusion has been proved theoretically.
     2)提出了基于结构一阶振型斜率改变的损伤定位方法,即对于剪切型框架结构,在单损伤的情况下,损伤层的一阶振型斜率改变必然大于0,并在理论上证明了这一结论。
短句来源
     5) Three damage cases of the 10-storey shearing building are considered. Locations of damages can be identified using the method based on changes in slopes of first order mode shape.
     5)对于10 层剪切型框架结构数值模型所讨论的三种损伤工况,通过采用本文提出的改进的基于一阶振型斜率改变的结构损伤定位算法,成功地识别出了所有损伤位置。
短句来源
     Firstly,the locations of damage for shear frame structures were estimated by using the changes in the slope of the first order mode shape with measurement noise,which made the number of structural parameters to be identified decrease sharply.
     通过包含较大测量误差的结构一阶振型斜率的变化来判别损伤位置,损伤位置的判别可大大减少待识别参数的数量.
短句来源
     Through theoretical derivation,it was seen the change in the slope of the first order mode shape of damage element was greater than zero.
     理论推导证明,当剪切型框架结构发生损伤时,损伤单元振型斜率的变化大于零,由此可判别损伤位置.
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Damages on a cantilever beam are simulated. Vibration mode analysis is by using commercial finite element software, and the analysis shows the sensitivity of the change ratio of the first order mode shape to the location and severity of structure damages. Hereby, the change ratio of the first order mode shape is presented as the indicator for structure damage detection.A successful identification of the location and severity of a structure damage is achieved by using artificial neural network.

以悬臂梁为研究对象,在其上进行损伤模拟。应用有限元程序进行模态分析,模态分析的结果表明第一阶振型改变率对不同位置和程度损伤的敏感性。提出以第一阶振型改变率作为结构损伤识别的标识量。应用神经网络,成功地识别了损伤的位置和程度,指出其可行性。

A two-step detection of damage for shear frame structures was presented.Firstly,the locations of damage for shear frame structures were estimated by using the changes in the slope of the first order mode shape with measurement noise,which made the number of structural parameters to be identified decrease sharply.Through theoretical derivation,it was seen the change in the slope of the first order mode shape of damage element was greater than zero.Therefore,the location of damage can be estimated...

A two-step detection of damage for shear frame structures was presented.Firstly,the locations of damage for shear frame structures were estimated by using the changes in the slope of the first order mode shape with measurement noise,which made the number of structural parameters to be identified decrease sharply.Through theoretical derivation,it was seen the change in the slope of the first order mode shape of damage element was greater than zero.Therefore,the location of damage can be estimated by using it as a damage indicator.Then,according to artificial neural network(ANN) algorithm,the extent of structural damage is diagnosed using the first several order frequencies which can be measured accurately.It was demonstrated via numerical simulation that structural damage can be identified satisfactorily with great computational efficiency and high computational accuracy.

针对剪切型框架结构提出了分步损伤检测的方法.通过包含较大测量误差的结构一阶振型斜率的变化来判别损伤位置,损伤位置的判别可大大减少待识别参数的数量.理论推导证明,当剪切型框架结构发生损伤时,损伤单元振型斜率的变化大于零,由此可判别损伤位置.在判别出损伤位置的基础上,利用能够较准确获得的结构前几阶固有频率作为神经网络的输入,建立损伤程度识别神经网络,进行结构损伤程度的识别.数值分析表明,该方法能够有效实现剪切型框架结构的损伤检测,并具有很高的计算效率和计算精度.

To reach the system stability by the revisable network of attitude control system for a launch vehicle under various conditions,the negative damp zero network with the characteristics of the same amplitude and phase lag was applied on the revisable network design to replace the conventional positive damp zero network in this paper.The realization of the negative damp zero network in the onboard computer,and the repeatability and stability were verified in the test.The application of the negative damp zero network...

To reach the system stability by the revisable network of attitude control system for a launch vehicle under various conditions,the negative damp zero network with the characteristics of the same amplitude and phase lag was applied on the revisable network design to replace the conventional positive damp zero network in this paper.The realization of the negative damp zero network in the onboard computer,and the repeatability and stability were verified in the test.The application of the negative damp zero network on the attitude control system of the first class for some launch vehicle showed that the system stability would be realized when the slope of first order mode shape near the mounting position of the rate gyro was positive.This method was valuable in the design of attitude control system for other launch vehicle.

为在不同条件下由运载姿控系统校正网络实现系统的稳定,根据负阻尼零点网络幅值相同、相位滞后的特性,将其用于校正网络设计以替代常用的正阻尼零点网络。证明了箭机对负阻尼零点网络的可实现性,以及测试的重复性和稳定性。某运载一级姿控系统负阻尼零点校正网络的应用表明,可在速率陀螺安装处一阶振型斜率为正时实现系统的稳定。该方法对其他型号的设计有一定的参考价值。

 
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