Basic Research for On-line Identification of Physical Parameters Involved in Flexible Structures

柔性结构物理参数在线识别基础研究

• 批准号: 09650080
• 负责人: OHSUMI Akira
• 金额: $ 2.24万
• 依托单位: KYOTO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650080/
• 关键词: Modeling of distributed parameter system; Parameter identification; On-line parameter algorithm; Inverse problem; 分布定数系のモデリング

The principal purpose of this basic research is to establish the on-line algorithms for determining physical parameters involved in the model of cantilevered beam such as the Young's modulus, Kelvin-Voigt structural and air damping coefficients. These unknown parameters can not be measured directly no matter what instruments or sensors are employed. The measurement is performed only for the displacement of the beam. So the problem is to construct any computer algorithm for identification by using indirectly measured dynamic data.In order to research step by step, at first the identification algorithm for two unknown physical parameters(the internal damping coefficient and the Young's modulus) of the uniform cantilevered beam is established. Next, by developing the above-mentioned algorithm an on-line computational algorithm for determining the two unknown parameters is proposed for a class of uniform mechanically beams. Then the inverse problem for the spatially distributed (i.e., spatially-varying)model two parameters are considered for the non-uniform cantilevered beam.Needless to say, when we deal with flexible structures on the ground, the effect of the air damping cannot be neglected. Taking the air damping effect into account, a simultaneous identification algorithm is proposed for determining Kelvin-Voigt structural and the air damping coefficient and Young's modulus. For the identification problem about three kinds of unknown parameters, we also construct an on-line identification problem for three parameters. Furthermore we develop the (off-line) identification algorithm for three spatially-varying parameters.The identification method proposed in this research are the indirectly measurement method, so-called 'soft sensor', by which we decide unmeasurable physical parameters using the dynamic measurement data.

这项基础研究的主要目的是建立用于确定悬臂梁模型中所涉及的物理参数的在线算法，如杨氏模数、开尔文-沃伊特结构系数和空气阻尼系数。无论使用什么仪器或传感器，这些未知参数都不能直接测量。仅对梁的位移进行测量。为了逐步研究，首先建立了均匀悬臂梁的两个未知物理参数(内耗系数和杨氏弹性系数)的识别算法。其次，通过对上述算法的发展，提出了一种确定一类均匀力学梁两个未知参数的在线算法。然后考虑了非均匀悬臂梁的双参数空间分布(即空间变化)模型的反问题，不用说，在地面上处理柔性结构时，空气阻尼的影响是不能忽略的。在考虑空气阻尼影响的情况下，提出了一种同时确定开尔文-沃伊特结构和空气阻尼系数和杨氏弹性系数的识别算法。对于三种未知参数的辨识问题，我们还构造了三种参数的在线辨识问题。在此基础上，我们提出了三个空间变化参数的(离线)辨识算法。本研究提出的辨识方法是间接测量法，即所谓的软测量方法，即利用动态测量数据来确定不可测量的物理参数。

项目成果

N.Nakano: "Identification of Spatially-varying Physical Parameters Involved with Flexible beams"Proc.2nd World Conference on Structural Control. 3. 2241-2248 (1999)

N.Nakano：“涉及柔性梁的空间变化物理参数的识别”Proc.第二届世界结构控制会议。

A.Ohsumi: "Identification of Parameters Spatially-invariant/varying Physical Parameters of Dynamic Beams"Proc.3rd Japan-Central Europe Joint Workshop on Modelling and Simulation on Non-linear Engineering Systems and Related Phenomena. 1. 335-338 (1998)

A.Ohsumi：“动态梁的参数空间不变/变化的物理参数的识别”Proc.第三届日本-中欧非线性工程系统及相关现象建模与仿真联合研讨会。

A.Ohsumi: "Identification of Parameters in Flexible Structure Models" Proc.3rd Asia-Pacific Conference on Control & Measurements. 1. 53-57 (1998)

A.Ohsumi：“柔性结构模型中参数的识别”Proc.3rd Asia-Pacific Conference on Control

中野統英: "柔軟構造物の未知パラメータの同定"システム制御情報学会第42回研究発表講演会講演論文集. 1. 427-428 (1998)

Tohide Nakano：“柔性结构未知参数的识别”系统、控制和信息工程师学会第 42 届研究报告会议论文集 1. 427-428 (1998)。

N. Nakano: "Identification of Spatially-varying Physical Paramaters Involved with Flexible Beams"Proc. 2nd World Conference on Structural Control. 3. 2241-2248 (1999)

N. Nakano：“涉及柔性梁的空间变化物理参数的识别”Proc。