Trajectory Control and Analysis for the Vertical Takeoff and Vertical Landing Reusable Launch Vehicle's Upper Stage

Landing gear system is a key part of the implementation of reusable vertical takeoff and vertical landing launch vehicle, where its buffing performance is directly related to the vehicle whether it can land safely or stably. According to the reusable launch vehicle general scheme, outrigger landing legs are designed, and the hydraulic absorber is used for the landing gear system. Meanwhile, a scaling principle prototype of landing gear system is developed, and the landing impact test is carried out. A dynamic simulation model of the landing vehicle has been set up, researching the influence of parameters, such as the horizontal velocity, initial inclination, surface friction coefficient, and pitch angular velocity on the landing performance. Four kinds of extreme conditions are identified, and dynamic response characteristics of landing system under each extreme condition are conducted. The simulation results are in good agreement with the experimental data. The buffing performance of the vehicle meets the design requirements, which provides a reference for the design of landing gear system of the vehicle.

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Trajectory optimization for lunar rover performing vertical takeoff vertical landing maneuvers in the presence of terrain

Acta Astronautica ◽

10.1016/j.actaastro.2018.03.013 ◽

2018 ◽

Vol 146 ◽

pp. 289-299 ◽

Cited By ~ 6

Author(s):

Lin Ma ◽

Kexin Wang ◽

Zuhua Xu ◽

Zhijiang Shao ◽

Zhengyu Song ◽

...

Keyword(s):

Trajectory Optimization ◽

Lunar Rover ◽

Vertical Landing ◽

Vertical Takeoff

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Uncertainty Analysis for Return Trajectory of Vertical Takeoff and Vertical Landing Reusable Launch Vehicle

Mathematical Problems in Engineering ◽

10.1155/2020/4313758 ◽

2020 ◽

Vol 2020 ◽

pp. 1-18

Author(s):

Jian Zhao ◽

Haiyang Li ◽

Xiangyue He ◽

Yuechen Huang ◽

Jianghui Liu

Keyword(s):

Uncertainty Analysis ◽

Expansion Method ◽

Approximation Problem ◽

Launch Vehicle ◽

Random Parameters ◽

Reusable Launch Vehicle ◽

Uncertainty Model ◽

Reliability And Robustness ◽

Vertical Landing ◽

Vertical Takeoff

The uncertainties during the return trajectory of vertical takeoff and vertical landing reusable launch vehicle weaken the ability of precision landing and make the return process more challenging. This paper is devoted to quantifying the probability uncertainty of return trajectory with uncertain parameters. The uncertainty model of return multi-flight-phase under the uncertainties of initial flight path angle, axial aerodynamic coefficient, and atmospheric density is established using the generalized polynomial chaos expansion method. By parameterizing random uncertainties and introducing random parameters into the uncertainty model, the uncertainty analysis problem of return trajectory is transformed into stochastic trajectory approximation problem. The coefficients of the polynomial basis function are solved by the stochastic collocation method. Then state solutions, statistical properties, and global sensitivity with Sobol index are established based on coefficients. The simulation results show the efficiency and accuracy of this method compared with the Monte Carlo method, the evolution process of main output parameters under random parameters, and relative importance for random parameters. Through the uncertainty analysis of the return trajectory, the robustness of return trajectory can be quantified, which is contributed to improving the safety, reliability, and robustness of recovery and landing mission.

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