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| Load Calculation of Drag Parachute for Fighter |
| Received:June 30, 2020 Revised:July 07, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.09.022 |
| KeyWord:drag parachute fluid solid coupling rocket sled test statistical analysis load spectrum |
| Author | Institution |
| CAI Zhi-jun |
AVIC Chengdu Aircraft Design & Research Institute, Chengdu , China |
| MIN Qiang |
AVIC Chengdu Aircraft Design & Research Institute, Chengdu , China |
| YU Ji-hong |
AVIC Chengdu Aircraft Design & Research Institute, Chengdu , China |
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| Abstract: |
| The paper aims to provide support for the static strength and fatigue strength analysis of the installation support structure of the drag parachute through research on the load calculation of the fighter drag parachute. By using engineering calculation method, fluid structure coupling numerical simulation method, and comparing the measured data of drag parachute rocket pulley test, the load calculation of drag parachute was studied. At the same time, based on the flight data, drag parachute release velocity, aircraft pitch angle, cross-wind velocity, direction and other parameters affecting the drag parachute load were statistically analyzed, to provide data base for compilation of load spectrum. The dynamic load coefficient k was determined to be 1.2 in engineering calculation method of parachute load, and the load history of parachute releasing was simplified as two load cycles with the peak value of stretching force and tension force, and the straightening force was 50% of the full tension force. Based on 766 takeoff and landing flight data of a certain type of aircraft, the parachute release velocity, aircraft pitch angle, cross-wind velocity and direction were fitted by Pearson Ⅲ distribution and exponential distribution. Combined with the calculation method of drag parachute load, the statistical law of drag parachute load value and direction distribution was obtained.The calculation method of parachute load and the selection of relevant parameters are defined. At the same time, a compilation method of parachute load spectrum in accordance with the actual use environment of fighter is proposed. |
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