Estimation of Rotational Frequency Response Function of Structures

结构旋转频率响应函数的估计

• 批准号: 12650232
• 负责人: YOSHIMURA Takuya
• 金额: $ 1.98万
• 依托单位: Tokyo Metropolitan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650232/
• 关键词: Experimental Modal Analysis; Rotational Degree of Freedom; Frequency Response Function; Measurement Technique; Substructure Synthesis Method

In this study, a measurement method of rotational FRF using a rigid T-block was presented. A feasibility study using a beam structure was conducted last year. The followings are the contents of this year study.1. Improvement of accuracy and expansion of applicabilityEffect of random noise on rotational FRF measurement is investigated. The estimation approach in order to improve the accuracy is presented. The advanced approach is also examined, in which the elastic vibration of the T-block is considered to expand the applicable frequency range. By these investigations the applicable frequency range is expanded up to 1,000 Hz whereas the range is originally covered up to 500 Hz.2. Application to an industrial structureThe presented FRF estimation method is applied to an automobile sub-frame structure. The validity is confirmed by comparing estimated FRF with the FEM prediction. Structural Dynamics Modification is carried out to the sub-frame by using the rotational FRFs. Applicability to the real industrial structure is confirmed.3. Summary of the StudyThe flow of the experimental modal analysis in which the rotational DOFs are taken into account is presented. It is shown that the experimental modal analysis becomes more useful and predictable in the presented scheme.

在本研究中，提出了一种使用刚性 T 形块测量旋转频响函数的方法。去年进行了使用梁结构的可行性研究。本年度的学习内容如下： 1．精度的提高和适用性的扩展研究了随机噪声对旋转频响函数测量的影响。提出了提高精度的估计方法。还研究了先进的方法，其中考虑T型块的弹性振动来扩大适用的频率范围。通过这些调查，适用的频率范围扩大到 1,000 Hz，而原来覆盖的范围高达 500 Hz。2。在工业结构中的应用所提出的频响函数估计方法被应用于汽车副车架结构。通过将估计的 FRF 与 FEM 预测进行比较来证实其有效性。利用旋转频响函数对副车架进行结构动力学修正。验证了其对实际产业结构的适用性； 3．研究总结介绍了考虑旋转自由度的实验模态分析流程。结果表明，在所提出的方案中，实验模态分析变得更加有用和可预测。

项目成果

Naoki HOSOYA, Takuya YOSHIMURA: "FRF Measurement on Rotational Degrees of Freedom of Structures"Proceedings of the Asia-Pacific Vibration Conference'2001. Vol.II. 751-756 (2001)

Naoki HOSOYA、Takuy​​a YOSHIMURA：“结构旋转自由度的 FRF 测量”2001 年亚太振动会议论文集。

細矢直基, 吉村卓也: "構造物の回転自由度に関する周波数応答関数の推定(自己FRF推定法の提案と基礎的検討)"日本機械学会論文集C編. 67巻657号. 1470-1477 (2001)

Naoki Hosoya，Takuy​​a Yoshimura：“关于结构旋转自由度的频率响应函数的估计（自FRF估计方法的提案和基础研究）”日本机械工程师学会学报，C版，第67卷。 657. 1470-1477 (2001)

細矢 直基, 吉村 卓也: "構造物の回転自由度に関する周波数応答関数の推定(ランダム誤差を考慮した推定法の提案とその精度評価)"日本機械学会,機械力学・計測制御講演論文集. No.01-5(CD-ROM). (2001)

Naoki Hosoya、Takuy​​a Yoshimura：“关于结构旋转自由度的频率响应函数的估计（考虑随机误差的估计方法的提议及其准确性的评估）”日本机械工程师学会，机械动力学和仪器仪表与控制讲座论文集，编号.01-5(CD-ROM) (2001)。

Naoki HOSOYA, Takuya YOSHIMURA: "Estimation of Frequency Response Function on Rotational Degrees of Freedom of Structures (Estimation of Auto FRFs and Its Fundamental Investigation) (in Japanese)"Transaction of JSME Ser.C. 67-657. 1470-1477 (2001)

Naoki HOSOYA、Takuy​​a YOSHIMURA：“结构旋转自由度频率响应函数的估计（自动 FRF 的估计及其基本研究）（日语）”JSME Ser.C 交易。

Naoki HOSOYA, Takuya YOSHIMURA: "FRF Measurement on Rotational Degrees of Freedom of Structures"Proceedings of the Asia-Pacific Vibration Conference '2001. Vol.II. 751-756 (2001)

Naoki HOSOYA、Takuy​​a YOSHIMURA：“结构旋转自由度的 FRF 测量”2001 年亚太振动会议论文集。