摘要
为准确预估探测器着陆冲击过程的动力学响应,采用非线性有限元方法建立了探测器软着陆动力学模型,全面考虑了各种非线性因素的影响。为保证仿真精度,提高计算效率,提出了一种缓冲腿的简化模型并采用隐式算法求解系统动力学方程。通过与试验数据的对比证明了简化模型及计算方法的有效性。在此基础上,分析了具有不同阻尼和不同刚度的着陆器中心体对有效载荷冲击响应的影响,并针对刚度的影响给出了理论解释。研究结果表明阻尼可以很好地缓冲有效载荷的加速度响应,而中心体刚度大小与有效载荷的加速度响应峰值呈负相关。研究结果对探测器的动力学分析与设计提供了一定的理论依据和技术支持。
The soft landing impact performance of lunar lander has a bearing on the success of moon mission. In order to accurately predict the dynamics response of a lunar lander during the landing process, the flexible model of the lunar lander is built by using nonlinear finite element method. This method comprehensively considers various nonlinear factors. For the sake of improving computational efficiency and guaranteeing simulation accuracy, a simplified model for cushion legs is presented, and an implicit algorithm is adopted to solve system kinematics equations. The effectiveness of the proposed simplified model and the simulation method are validated by comparison with test data. On this basis, the influence of center bodies with different damping and stiffness on the impact response of a payload is investigated, and then the theoretical explanation for the influence caused by stiffness is given. Results indicate that the acceleration response of the payload can be easily reduced by damping, and there is a negative correlation between the stiffness of the center body and the acceleration response peak value of the payload. This research provides theory basis and technical support for dynamics analysis and design of lunar lander.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2014年第4期388-396,共9页
Journal of Astronautics
基金
北京理工大学基础研究基金(20120142009)
关键词
月面软着陆
柔性系统
非线性有限元法
隐式算法
缓冲腿简化
Lunar landing
Flexible system
Nonlinear finite element method
Implicit algorithm
Simplified cushion legs
