Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model
The rod-fastened rotor is the core component of the gas turbine. It comprises several discs and tie rods. The flexural stiffness of the contact interface is the key factor for rotordynamic analysis. The contact interfaces of the discs are usually manufactured by grinding. The measured contour curve...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2019/4027353 |
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| _version_ | 1832559400496136192 |
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| author | Yang Liu Qi Yuan Pu Li Guangyu Zhu |
| author_facet | Yang Liu Qi Yuan Pu Li Guangyu Zhu |
| author_sort | Yang Liu |
| collection | DOAJ |
| description | The rod-fastened rotor is the core component of the gas turbine. It comprises several discs and tie rods. The flexural stiffness of the contact interface is the key factor for rotordynamic analysis. The contact interfaces of the discs are usually manufactured by grinding. The measured contour curve of the contact interfaces of an experimental rod-fastened rotor is analyzed by the structural function method, which shows that the contact interfaces can be well described by the double fractal model with fractal dimensions D1 and D2 and the fractal roughness parameters G1 and G2. The Hertz model is used to analyze the contact of the single asperity on the contact interface. On this basis, the flexural stiffness of the contact interface considering the pretightening force and the bending moment is derived. Modal frequencies of the experimental rod-fastened rotor under different pretightening forces and the bending moment (caused by gravity) are obtained by three-dimensional finite element analysis and experimental modal tests. It is observed that the modal frequencies increase with the nominal pressure of the contact interface, and the experimental results are consistent with the calculated results. |
| format | Article |
| id | doaj-art-24ba4b33a87d43458bcc005ba7f89bfe |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-24ba4b33a87d43458bcc005ba7f89bfe2025-02-03T01:30:00ZengWileyShock and Vibration1070-96221875-92032019-01-01201910.1155/2019/40273534027353Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal ModelYang Liu0Qi Yuan1Pu Li2Guangyu Zhu3School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaThe rod-fastened rotor is the core component of the gas turbine. It comprises several discs and tie rods. The flexural stiffness of the contact interface is the key factor for rotordynamic analysis. The contact interfaces of the discs are usually manufactured by grinding. The measured contour curve of the contact interfaces of an experimental rod-fastened rotor is analyzed by the structural function method, which shows that the contact interfaces can be well described by the double fractal model with fractal dimensions D1 and D2 and the fractal roughness parameters G1 and G2. The Hertz model is used to analyze the contact of the single asperity on the contact interface. On this basis, the flexural stiffness of the contact interface considering the pretightening force and the bending moment is derived. Modal frequencies of the experimental rod-fastened rotor under different pretightening forces and the bending moment (caused by gravity) are obtained by three-dimensional finite element analysis and experimental modal tests. It is observed that the modal frequencies increase with the nominal pressure of the contact interface, and the experimental results are consistent with the calculated results.http://dx.doi.org/10.1155/2019/4027353 |
| spellingShingle | Yang Liu Qi Yuan Pu Li Guangyu Zhu Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model Shock and Vibration |
| title | Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model |
| title_full | Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model |
| title_fullStr | Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model |
| title_full_unstemmed | Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model |
| title_short | Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model |
| title_sort | modal analysis for a rod fastened rotor considering contact effect based on double fractal model |
| url | http://dx.doi.org/10.1155/2019/4027353 |
| work_keys_str_mv | AT yangliu modalanalysisforarodfastenedrotorconsideringcontacteffectbasedondoublefractalmodel AT qiyuan modalanalysisforarodfastenedrotorconsideringcontacteffectbasedondoublefractalmodel AT puli modalanalysisforarodfastenedrotorconsideringcontacteffectbasedondoublefractalmodel AT guangyuzhu modalanalysisforarodfastenedrotorconsideringcontacteffectbasedondoublefractalmodel |