Study on the dynamic identification method of the weak part of the bar-shaped combined structure
The weak part of the stiffness of machine tool combined structure is the key to improve the stiffness of machine tool. To overcome the static deformation with difficulty acquisition, the paper chooses machine tool combined structure which can be equivalent to one-dimensional bar structure, and a wea...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2021-02-01
|
| Series: | Advances in Mechanical Engineering |
| Online Access: | https://doi.org/10.1177/1687814021996526 |
| _version_ | 1819050716850814976 |
|---|---|
| author | Tieneng Guo Lingjun Meng Jinxuan Cao Chunsheng Bai Xu Hua Cheng Zhou |
| author_facet | Tieneng Guo Lingjun Meng Jinxuan Cao Chunsheng Bai Xu Hua Cheng Zhou |
| author_sort | Tieneng Guo |
| collection | DOAJ |
| description | The weak part of the stiffness of machine tool combined structure is the key to improve the stiffness of machine tool. To overcome the static deformation with difficulty acquisition, the paper chooses machine tool combined structure which can be equivalent to one-dimensional bar structure, and a weakness index (WI) is proposed to identify the weak part of the stiffness by means of the dynamic hammer test method. Based on the bar structure as a numerical example, the weak parts are modeled as EA reduction in stiffness while the mass is maintained at a constant value. Thorough finite element (FE) method simulations are performed to assess the robustness and limitations of the method in several scenarios with single and multiple weakness. On the crossbeam of gantry type machine tool, the sensors are used to collect vibration data, the structural modal parameters are obtained by singular value decomposition (SVD) technique, and the dynamic characteristics are systematically reconstructed by using modal state space method to obtain stiffness data at zero-frequency. Then, the weak part of the structural stiffness is identified by the weakness index. Finally, the comparison of FE simulations and experiment results are provided to illustrate the working of the method. |
| first_indexed | 2024-12-21T11:52:28Z |
| format | Article |
| id | doaj.art-dd76703acb6b4b9fa99b121ea573204d |
| institution | Directory Open Access Journal |
| issn | 1687-8140 |
| language | English |
| last_indexed | 2024-12-21T11:52:28Z |
| publishDate | 2021-02-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Advances in Mechanical Engineering |
| spelling | doaj.art-dd76703acb6b4b9fa99b121ea573204d2022-12-21T19:05:01ZengSAGE PublishingAdvances in Mechanical Engineering1687-81402021-02-011310.1177/1687814021996526Study on the dynamic identification method of the weak part of the bar-shaped combined structureTieneng Guo0Lingjun Meng1Jinxuan Cao2Chunsheng Bai3Xu Hua4Cheng Zhou5Beijing key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing, ChinaBeijing key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing, ChinaJiangling Motors Corporation Ltd, Nanchang, Jiangxi, ChinaTianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin, ChinaMechanical Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing, Beijing, ChinaMechanical Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing, Beijing, ChinaThe weak part of the stiffness of machine tool combined structure is the key to improve the stiffness of machine tool. To overcome the static deformation with difficulty acquisition, the paper chooses machine tool combined structure which can be equivalent to one-dimensional bar structure, and a weakness index (WI) is proposed to identify the weak part of the stiffness by means of the dynamic hammer test method. Based on the bar structure as a numerical example, the weak parts are modeled as EA reduction in stiffness while the mass is maintained at a constant value. Thorough finite element (FE) method simulations are performed to assess the robustness and limitations of the method in several scenarios with single and multiple weakness. On the crossbeam of gantry type machine tool, the sensors are used to collect vibration data, the structural modal parameters are obtained by singular value decomposition (SVD) technique, and the dynamic characteristics are systematically reconstructed by using modal state space method to obtain stiffness data at zero-frequency. Then, the weak part of the structural stiffness is identified by the weakness index. Finally, the comparison of FE simulations and experiment results are provided to illustrate the working of the method.https://doi.org/10.1177/1687814021996526 |
| spellingShingle | Tieneng Guo Lingjun Meng Jinxuan Cao Chunsheng Bai Xu Hua Cheng Zhou Study on the dynamic identification method of the weak part of the bar-shaped combined structure Advances in Mechanical Engineering |
| title | Study on the dynamic identification method of the weak part of the bar-shaped combined structure |
| title_full | Study on the dynamic identification method of the weak part of the bar-shaped combined structure |
| title_fullStr | Study on the dynamic identification method of the weak part of the bar-shaped combined structure |
| title_full_unstemmed | Study on the dynamic identification method of the weak part of the bar-shaped combined structure |
| title_short | Study on the dynamic identification method of the weak part of the bar-shaped combined structure |
| title_sort | study on the dynamic identification method of the weak part of the bar shaped combined structure |
| url | https://doi.org/10.1177/1687814021996526 |
| work_keys_str_mv | AT tienengguo studyonthedynamicidentificationmethodoftheweakpartofthebarshapedcombinedstructure AT lingjunmeng studyonthedynamicidentificationmethodoftheweakpartofthebarshapedcombinedstructure AT jinxuancao studyonthedynamicidentificationmethodoftheweakpartofthebarshapedcombinedstructure AT chunshengbai studyonthedynamicidentificationmethodoftheweakpartofthebarshapedcombinedstructure AT xuhua studyonthedynamicidentificationmethodoftheweakpartofthebarshapedcombinedstructure AT chengzhou studyonthedynamicidentificationmethodoftheweakpartofthebarshapedcombinedstructure |