Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load System
In order to reveal the mechanism of Category II rotor-body-slung-load coupled oscillation (RBSLCO) with the frequency range of 2.5~8 Hz, a novel nonlinear rigid-elastic coupled model is presented for the helicopter and slung load system (HSLS) with explicit formulation. The slung load system model i...
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MDPI AG
2023-10-01
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| Series: | Aerospace |
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| Online Access: | https://www.mdpi.com/2226-4310/10/10/872 |
| _version_ | 1827722103091101696 |
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| author | Yu Tian Luofeng Wang Zhongliang Zhou Renliang Chen |
| author_facet | Yu Tian Luofeng Wang Zhongliang Zhou Renliang Chen |
| author_sort | Yu Tian |
| collection | DOAJ |
| description | In order to reveal the mechanism of Category II rotor-body-slung-load coupled oscillation (RBSLCO) with the frequency range of 2.5~8 Hz, a novel nonlinear rigid-elastic coupled model is presented for the helicopter and slung load system (HSLS) with explicit formulation. The slung load system model is coupled with the current rigid-elastic coupled helicopter model, considering fuselage hook point rigid-elastic coupled movements, cable stretching, and hook point force from the slung load system. The results show that carrying the heaviest load is the vital state for Category II RBSLCO. As slung load mass ratio increases, rotor-fuselage coupling becomes stronger and the oscillation frequency shifts slightly, causing a maximum of 15% reduction in stability margin. In addition, even when the load is lightweight, another form of Category II RBSLCO may appear involving fuselage bending and cable stretching. This Category II RBSLCO behaves like the vertical bouncing but is divided into a high-frequency anti-phase oscillation and a relatively low-frequency in-phase oscillation. |
| first_indexed | 2024-03-10T21:30:57Z |
| format | Article |
| id | doaj.art-09ed4d71fe934ae2bb0fcacf391c5a10 |
| institution | Directory Open Access Journal |
| issn | 2226-4310 |
| language | English |
| last_indexed | 2024-03-10T21:30:57Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
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| series | Aerospace |
| spelling | doaj.art-09ed4d71fe934ae2bb0fcacf391c5a102023-11-19T15:17:19ZengMDPI AGAerospace2226-43102023-10-01101087210.3390/aerospace10100872Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load SystemYu Tian0Luofeng Wang1Zhongliang Zhou2Renliang Chen3College of Equipment Management and UAV Engineering, Air Force Engineering University, Xi’an 710000, ChinaNational Key Laboratory of Helicopter Aeromechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Equipment Management and UAV Engineering, Air Force Engineering University, Xi’an 710000, ChinaNational Key Laboratory of Helicopter Aeromechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaIn order to reveal the mechanism of Category II rotor-body-slung-load coupled oscillation (RBSLCO) with the frequency range of 2.5~8 Hz, a novel nonlinear rigid-elastic coupled model is presented for the helicopter and slung load system (HSLS) with explicit formulation. The slung load system model is coupled with the current rigid-elastic coupled helicopter model, considering fuselage hook point rigid-elastic coupled movements, cable stretching, and hook point force from the slung load system. The results show that carrying the heaviest load is the vital state for Category II RBSLCO. As slung load mass ratio increases, rotor-fuselage coupling becomes stronger and the oscillation frequency shifts slightly, causing a maximum of 15% reduction in stability margin. In addition, even when the load is lightweight, another form of Category II RBSLCO may appear involving fuselage bending and cable stretching. This Category II RBSLCO behaves like the vertical bouncing but is divided into a high-frequency anti-phase oscillation and a relatively low-frequency in-phase oscillation.https://www.mdpi.com/2226-4310/10/10/872helicopter flight dynamicshelicopter and slung loadrigid-elastic couplingrotor-body-slung-load coupled oscillationheavy lift helicopter |
| spellingShingle | Yu Tian Luofeng Wang Zhongliang Zhou Renliang Chen Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load System Aerospace helicopter flight dynamics helicopter and slung load rigid-elastic coupling rotor-body-slung-load coupled oscillation heavy lift helicopter |
| title | Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load System |
| title_full | Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load System |
| title_fullStr | Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load System |
| title_full_unstemmed | Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load System |
| title_short | Nonlinear Rigid-Elastic Coupled Modeling and Oscillation Mechanism Analysis of Rotor-Body-Slung-Load System |
| title_sort | nonlinear rigid elastic coupled modeling and oscillation mechanism analysis of rotor body slung load system |
| topic | helicopter flight dynamics helicopter and slung load rigid-elastic coupling rotor-body-slung-load coupled oscillation heavy lift helicopter |
| url | https://www.mdpi.com/2226-4310/10/10/872 |
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