Dynamic analysis for vertical soft landing of reusable launch vehicle with landing strut flexibility

Abstract

Based on oleo-honeycomb dampers, a 6-DOF vertical soft landing dynamic model for reusable launch vehicle considering landing strut flexibility is constructed. In order to better analyze the lateral deflection and friction force of the “cantilever beam” type landing strut, a new model for strut is incorporated. Static analysis is first performed based on the rotation angle compatibility equations to attain the equivalent inertia moment. Then the strut lateral vibration model and friction force model are obtained by simplifying it as viscoelastic beam with a tip mass. After that, the ADAMS models are established to perform the comparison and verification analysis of the 6-DOF dynamic model. The results show that the results of 6-DOF dynamic model can approximately approach to the results of rigid-flex coupling model established in ADAMS. Furthermore, the research of the influence of assembly gap between cylinders and bearings, bearing’s elastic modulus, friction coefficient and initial overlapping length on the vehicle landing performance is carried out. The results show that each parameter has different influence on the landing performance, and a reasonable selection of these parameters accordingly enables a higher landing performance.

Keywords

Landing dynamics reusable launch vehicle landing strut lateral deflection friction force

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References

Zhang

. Recent progress on development trend and key technologies of vertical take-off vertical landing reusable launch vehicle. Chin Sci Bull 2016; 61: 3453–3463.

Vergnolle JF. Soft landing impact attenuation technologies review. In: AIAA 13th Aerodynamic decelerator systems technology conference, Clearwater Beach, FL, 15–18 May 1995.

Doiron H and George ZJ. Apollo lunar module landing dynamics. In: 41st Structures, structural dynamics, and materials conference and exhibit, Atlanta, GA, 3–6 April 2000.

Liang

Chai

Zeng

. Nonlinear finite element modeling and simulation for landing leg of lunar lander. J Beijing Univ Aeronaut Astronaut 2013; 39: 11–15.

Zupp

Dorion

. A mathematical procedure for predicting the touchdown dynamics of a soft-landing vehicle. NASA Paper 1971; TN-D-7045: 15–21.

Nohmi M and Miyahara A. Modeling for lunar lander by mechanical dynamics software. In: AIAA modeling and simulation technologies conference and exhibit, San Francisco, CA, 15–18 August 2005.

Lin

Kang

Nie

. Impact Analysis of lunar lander soft landing performance caused by the body gravity centerline shift. J Aerosp Eng 2014; 28: 04014104–04014104.

Wei

Lin

Nie

. Investigation on soft-landing dynamics of four-legged lunar lander. Acta Astronaut 2014; 101: 55–66.

Takao

Masatsugu

Tatsuaki

et al.

Attitude stabilization for lunar and planetary lander with variable damper. J Guid Control Dynam 2016; 39: 1790–1804.

10.

Chen

Nie

. Overloading of landing based on the deformation of the lunar lander. Chin J Aeronaut 2008; 21: 43–47.

11.

Song

Wang

. Dynamic analysis for lunar lander based on rigid-flexible coupled model. J Beijing Univ Aeronaut Astronaut 2010; 36: 1348–1352.

12.

Xu L, Nie H and Wan J. Analysis of landing impact performance for lunar lander based on flexible body. In: IEEE international conference on computer science and automation engineering, Shanghai, 10–12 June 2011, pp.10–13.

13.

Dong

Liu

Zhou

. Substructure synthesis in time domain with rigid–elastic hybrid joints. AIAA J 2015; 53: 504–510.

14.

Wei

Liu

. Improved model of landing-gear drop dynamics. J Aircraft 2014; 51: 695–700.

15.

Zou

Reid

Tan

. Dynamic crushing of honeycombs and features of shock fronts. Int J Impact Eng 2009; 36: 165–176.

16.

Wang

Yue

. Statics analysis of self-lubricating spherical plain bearings based on FEM. Bearing 2014; 4: 10–13.

17.

Põdra

Anderson

. Wear simulation with the Winkler surface model. Wear 1997; 207: 79–85.

18.

Qiu

Zhou

. Analytical solution for interference fit for multi-layer thick-walled cylinders and the application in crankshaft bearing design. Appl Sci 2016; 6: 167–167.

19.

Rao

. Mechanical vibrations, 5th ed. New York, NY: Pearson Education, 2011.

20.

Seshu

. Substructuring and component mode synthesis. Shock Vib 1997; 4: 199–210.

21.

Khapane

. Simulation of aircraft landing gear dynamics using flexible multibody dynamics methods in Simpack. In: International Council of the Aeronautical Sciences, Japan: Yokohama, August 2004.

22.

Sapietová

Novák

Gajdoš

. Analysis of impact force in tensioning mechanism in MSC.ADAMS with consideration of rigid and flexible bodies. Appl Mech Mater 2015; 816: 165–173.

23.

Xue

. A simplified flexible multibody dynamics for a main landing gear with flexible leaf spring. Shock Vib 2014; 2014: 1–10.

24.

Zhu

. Key technologies of rigid-flexible coupling system modeling and simulation. Appl Mech Mater 2014; 599: 652–655.