Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation
Compared to ordinary rotor, rod fastening rotor has the advantages of lighter weight, higher strength and easier installation, so it is widely used in gas turbine. However, in the process of a long-term operation, the rod may be deformed due to the influence of alternating load, high temperature and...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-01-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/15/3/1052 |
| _version_ | 1797488068117135360 |
|---|---|
| author | Li Zhao Haosui Zhang Peng Shen Yibing Liu |
| author_facet | Li Zhao Haosui Zhang Peng Shen Yibing Liu |
| author_sort | Li Zhao |
| collection | DOAJ |
| description | Compared to ordinary rotor, rod fastening rotor has the advantages of lighter weight, higher strength and easier installation, so it is widely used in gas turbine. However, in the process of a long-term operation, the rod may be deformed due to the influence of alternating load, high temperature and other uncertain factors. In serious cases, it can even lead to a major accident. The discontinuous characteristic of rod fastening rotor leads to great differences in dynamic characteristics compared to ordinary rotor. Based on the Herz contact theory and GW contact model, the contact effect between two discs was studied, and the relationship among the contact load, the distance between two disks and the equivalent bending stiffness was obtained. Findings show the bending stiffness to decrease nonlinearly with the decrease in contact load. The lumped mass method was used to establish the rotor model. The contact effect was considered and the Runge–Kutta method was used to solve the model. Combined with the bifurcation diagram, time domain diagram and spectrum diagram, the influence of contact stiffness on rotor dynamic characteristics was analyzed. The results show that the dynamic characteristics of the rod fastening rotor are rich due to the influence of nonlinear factors. In the case of uniform relaxation, the contact stiffness has different effects on the response state and frequency doubling amplitude of the system at different speeds, which is mainly related to the motion state of the system. In the case of non-uniform relaxation, the degree of relaxation does not affect the motion state of the system, but only changes the amplitude of vibration. The results provide theoretical support for condition monitoring and fault diagnosis of rod fastening rotor. |
| first_indexed | 2024-03-09T23:56:50Z |
| format | Article |
| id | doaj.art-d33b48637cc946cd9b4f98989ccb3373 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T23:56:50Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d33b48637cc946cd9b4f98989ccb33732023-11-23T16:24:20ZengMDPI AGEnergies1996-10732022-01-01153105210.3390/en15031052Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload RelaxationLi Zhao0Haosui Zhang1Peng Shen2Yibing Liu3Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, ChinaKey Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, ChinaKey Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, ChinaKey Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, ChinaCompared to ordinary rotor, rod fastening rotor has the advantages of lighter weight, higher strength and easier installation, so it is widely used in gas turbine. However, in the process of a long-term operation, the rod may be deformed due to the influence of alternating load, high temperature and other uncertain factors. In serious cases, it can even lead to a major accident. The discontinuous characteristic of rod fastening rotor leads to great differences in dynamic characteristics compared to ordinary rotor. Based on the Herz contact theory and GW contact model, the contact effect between two discs was studied, and the relationship among the contact load, the distance between two disks and the equivalent bending stiffness was obtained. Findings show the bending stiffness to decrease nonlinearly with the decrease in contact load. The lumped mass method was used to establish the rotor model. The contact effect was considered and the Runge–Kutta method was used to solve the model. Combined with the bifurcation diagram, time domain diagram and spectrum diagram, the influence of contact stiffness on rotor dynamic characteristics was analyzed. The results show that the dynamic characteristics of the rod fastening rotor are rich due to the influence of nonlinear factors. In the case of uniform relaxation, the contact stiffness has different effects on the response state and frequency doubling amplitude of the system at different speeds, which is mainly related to the motion state of the system. In the case of non-uniform relaxation, the degree of relaxation does not affect the motion state of the system, but only changes the amplitude of vibration. The results provide theoretical support for condition monitoring and fault diagnosis of rod fastening rotor.https://www.mdpi.com/1996-1073/15/3/1052preloadrod fastening rotornonlinearcontact effectuniform relaxationnon-uniform relaxation |
| spellingShingle | Li Zhao Haosui Zhang Peng Shen Yibing Liu Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation Energies preload rod fastening rotor nonlinear contact effect uniform relaxation non-uniform relaxation |
| title | Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation |
| title_full | Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation |
| title_fullStr | Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation |
| title_full_unstemmed | Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation |
| title_short | Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation |
| title_sort | nonlinear dynamic characteristics of rod fastening rotor with preload relaxation |
| topic | preload rod fastening rotor nonlinear contact effect uniform relaxation non-uniform relaxation |
| url | https://www.mdpi.com/1996-1073/15/3/1052 |
| work_keys_str_mv | AT lizhao nonlineardynamiccharacteristicsofrodfasteningrotorwithpreloadrelaxation AT haosuizhang nonlineardynamiccharacteristicsofrodfasteningrotorwithpreloadrelaxation AT pengshen nonlineardynamiccharacteristicsofrodfasteningrotorwithpreloadrelaxation AT yibingliu nonlineardynamiccharacteristicsofrodfasteningrotorwithpreloadrelaxation |