scholarly journals Deployment dynamics analysis of CALLISTO’s approach and landing system

2021 ◽  
Author(s):  
Anton Schneider ◽  
Jean Desmariaux ◽  
Josef Klevanski ◽  
Silvio Schröder ◽  
Lars Witte
Keyword(s):  
Space Vehicle ◽  
Transportation Systems ◽  
Dynamics Analysis ◽  
Cooperative Action ◽  
System Parameters ◽  
Exhaust Plume ◽  
Aerodynamic Database ◽  
Deployment Dynamics ◽  
Broad Approach ◽  
Numerical Simulator

AbstractPrior to landing of reusable space transportation systems, the vehicle’s landing legs needs to be fully deployed to enable a safe landing and further re-use of the space vehicle. During that phase the deployment system has to overcome harsh and challenging environmental conditions. In this study, a numerical simulator is developed in order to investigate these influences on the landing leg deployment dynamics. By means of an extensive aerodynamic database and a broad approach flight domain, the influence of aerodynamics, exhaust plume, and vehicle’s attitude on the deployment dynamics is analyzed. This study shows on the example of the first stage demonstrator CALLISTO (Cooperative Action Leading to Launcher Innovation in Stage Toss back Operations), that thrust level, vehicle attitude, and the deployment system parameters affect the deployment performance.

Specific Features of Selecting the Power Supply System Parameters for a Space Vehicle Operating in Very Low Orbits

2018 ◽  
pp. 4-8
Author(s):  
Oleg V. MIKHEYEV ◽  
◽  
Aleksandr Ye. POLOZHENTSEV ◽  
Sergei V. BELIK ◽  
Aleksei Ye. OSHKIN ◽  
...  
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Space Vehicle ◽  
Supply System ◽  
System Parameters

Hidden Attractors and Dynamical Behaviors in an Extended Rikitake System

2015 ◽  
Vol 25 (02) ◽  
pp. 1550028 ◽  
Author(s):  
Zhouchao Wei ◽  
Wei Zhang ◽  
Zhen Wang ◽  
Minghui Yao
Keyword(s):  
Hopf Bifurcation ◽  
Initial Conditions ◽  
Dynamics Analysis ◽  
Hidden Attractor ◽  
Hidden Attractors ◽  
System Parameters ◽  
Dynamical Behaviors ◽  
Rikitake System ◽  
Wide Range ◽  
Stable Equilibria

In this paper, an extended Rikitake system is studied. Several issues, such as Hopf bifurcation, coexistence of stable equilibria and hidden attractor, and dynamics analysis at infinity are investigated either analytically or numerically. Especially, by a simple linear transformation, the wide range of hidden attractors is noticed, and the Lyapunov exponents diagram is given. The obtained results show that the unstable periodic solution generated by Hopf bifurcation leads to the hidden attractor. The existence of hidden attractors that may render the system's behavior unpredictable not only depends on the value of system parameters but also on the value of initial conditions. The phenomena are important and potentially problematic in engineering applications.

scholarly journals The Effect of Unbalance Mass on the Necessary Conditions of the Double-Support Rotor Autobalancing Stability

2019 ◽  
pp. 71-82
Author(s):  
A.N. Gorbenko ◽  
S.Kh. Shmelev ◽  
G. Strautmanis
Keyword(s):  
Necessary Conditions ◽  
Dynamics Analysis ◽  
Mass Center ◽  
Quantitative Criterion ◽  
Spherical Type ◽  
Double Support ◽  
System Parameters ◽  
Spatial Oscillations ◽  
The Common ◽  
Rotor Type

The analysis of necessary conditions for autobalancing stability of rotor, which performs spatial oscillations, was carried out in this paper taking into account the influence of unbalance and autobalancer masses. It was found that the using of traditional models, where unbalance and autobalancer masses are assumed small, could lead to significant errors in the dynamics analysis of spatially moving rotor. The influence of this factor leads to the doubling of the critical rotational speeds spectrum. Moreover, the system motion between the split critical frequencies is unstable. There may be one or two onset areas of autobalancing mode motion depending on the dynamic rotor type, its location relative to the supports, the unbalance mass and other system parameters. It was found that rotors, that are long type or close to the spherical type, are the most sensitive to this factor. On the other hand, rotors of the short type are weakly sensitive. It is shown that the most preferred case is when the unbalance and autobalancer location plane passes through the common mass center of the composite rotor. The quantitative criterion is formulated for the necessity of taking into account (or not taking into account) the influence of this factor when analyzing the system dynamics

scholarly journals Dynamics Analysis of Deployable Structures considering a Two-Dimensional Coupled Thermo-Structural Effect

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Qi’an Peng ◽  
Sanmin Wang ◽  
Bo Li ◽  
Changjian Zhi ◽  
Jianfeng Li
Keyword(s):  
Optimization Design ◽  
Control Process ◽  
Axial Direction ◽  
Structural Effect ◽  
Dynamics Analysis ◽  
Two Dimensional ◽  
Deployable Structures ◽  
One Dimensional ◽  
Deployable Structure ◽  
Deployment Dynamics

The deployment accuracy of deployable structures is affected by temperature and flexibility. To obtain the higher accuracy, various measures such as the optimization design and the control process are employed, and they are all based on deployment dynamics characteristics of deployable structures. So a precise coupled thermo-structural deployment dynamics analysis is important and necessary. However, until now, only a one-dimensional thermal effect is considered in the literatures because of simplicity, which reduces the accuracy of the model. Therefore, in this paper, a new model coupling mechanical field with a temperature field is presented to analyze the deployment dynamics of a deployable structure with scissor-like elements (SLEs). The model is based on the absolute nodal coordinate formulation (ANCF) and is established via a new locking-free beam element whose formulation is extended to account for the two-dimensional thermally induced stresses due to the heat expansion for the first time. Namely, in the formulation, the thermal influences are along two-dimensional directions, the axial direction and the transverse direction, rather than along a one-dimensional direction. The validity and precision of the proposed model are verified using a flexible pendulum example. Finally, the dynamics of a linear deployable structure with three SLEs modeled by the element is simulated under a temperature effect.

scholarly journals Modeling and Analysis of Axial Dynamics of Cable Arrangement Device Based on MATLAB

2021 ◽  
Author(s):  
Fankai Kong ◽  
Yucai Pan ◽  
Jiawei Zhao ◽  
Nan Zhang ◽  
Zhenyang Wang ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Dynamic Equation ◽  
Lagrange Equation ◽  
Dynamics Analysis ◽  
Modeling And Analysis ◽  
System Parameters ◽  
First Order ◽  
Axial Forces ◽  
Damping Model ◽  
Force Characteristics

Aiming at the current insufficient dynamic analysis of the cable arrangement device, the axial dynamics analysis of the cable arrangement device is carried out in combination with the force characteristics of the cable arrangement device. The axial dynamic model of cable arrangement device is established by using spring-damping model, and the dynamic equation is established by using Lagrange equation. The influence of system parameters of cable arrangement device on axial first-order natural frequency is analyzed by numerical method. By fitting and loading the external excitation of the cable arrangement device, the axial dynamic response of the cable arrangement device under different axial forces is obtained. Through numerical results, the influence laws of the position and mass of the traveling mechanism and the support stiffness of the lead screw on the axial first-order natural frequency are obtained, It is found that the axial displacement of the cable arrangement device under axial force is very small, and the cable arrangement device has strong retention of dynamic characteristics. The results have certain guiding significance for the structural design and application environment of cable arrangement device.

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