A Switching Scheme for Mixed PZT-Based/Jet Thrusters Control of a Large Flexible Structure

2000 ◽  
Vol 123 (4) ◽  
pp. 722-727 ◽  
Author(s):  
A. Ferrara, ◽  
L. Magnani, and ◽  
R. Scattolini
Keyword(s):  
Energy Consumption ◽  
Control Strategy ◽  
Vibration Suppression ◽  
Space Structure ◽  
Flexible Structure ◽  
Control Performance ◽  
Switching Scheme ◽  
Large Space ◽  
Large Space Structure ◽  
Reduce Energy Consumption

Vibration suppression of a large space structure is achieved by switching between different actuators in order to optimize control performance and to reduce energy consumption. The theoretical properties of the proposed control strategy are reported together with some experimental results.

Active vibration suppression for large space structure assembly: A distributed adaptive model predictive control approach

2020 ◽  
pp. 107754632092686
Author(s):  
Enmei Wang ◽  
Shunan Wu ◽  
Guangbin Xun ◽  
Yufei Liu ◽  
Zhigang Wu
Keyword(s):  
Vibration Suppression ◽  
Structural Characteristics ◽  
Space Structure ◽  
Adaptive Model ◽  
Large Space ◽  
Model Predictive Controller ◽  
Control Approach ◽  
Computation Efficiency ◽  
Large Space Structure ◽  
Predictive Controller

Subject to the limited envelope size and carrying capacity of a rocket, it could be one of the most promising solutions to construct a large space structure through multilaunching and on-orbit assembly. Taking the antenna of the solar power satellite as the research objective, a novel vibration suppression strategy is developed in this article to guarantee high structural stability of the large space structure during on-orbit assembly. The concept of distributed control unit, together with the varying location relationship matrices, reflects the structural characteristics of the large space structure during on-orbit assembly. The explicit expression form of the control unit’s dynamic model is first derived based on the Newmark-β method. Then, the distributed adaptive model predictive controller is proposed to suppress the vibration of the large space structure aroused by weak impact among assembling modules. Through recalculating the control matrices efficiently at each assembly, the proposed controller achieves adaptive updating along with the varying large space structure. The feasibility of the proposed distributed adaptive model predictive controller is investigated in the numerical simulations, and the centralized fast model predictive controller is adopted for better comparison. The results demonstrate that the distributed adaptive model predictive controller can effectively suppress vibration of the large space structure during on-orbit assembly, with good adaptability, robustness, and computation efficiency.

Formation of the control strategy for the large space structure assembled in orbit

2007 ◽  
Vol 68 (12) ◽  
pp. 2113-2127
Author(s):  
V. M. Glumov ◽  
V. Yu. Rutkovskii ◽  
V. M. Sukhanov
Keyword(s):  
Control Strategy ◽  
Space Structure ◽  
Large Space ◽  
Large Space Structure

Integrated Controls-Structures Optimization of a Large Space Structure

1990 ◽  
Author(s):  
SHARON PADULA ◽  
JOANNE WALSH ◽  
CHRIS SANDRIDGE ◽  
RAPHAEL HAFTKA
Keyword(s):  
Space Structure ◽  
Large Space ◽  
Large Space Structure

Empirical Formula Considering the Smoke Ventilation for Air Temperature in Large Space Structure under Fire

2011 ◽  
Vol 94-96 ◽  
pp. 587-593 ◽  
Author(s):  
Jin Liang ◽  
Su Duo Xue ◽  
Xiong Yan Li
Keyword(s):  
Air Temperature ◽  
Empirical Formula ◽  
Steel Structures ◽  
Space Structure ◽  
Space Structures ◽  
Large Space ◽  
Fire Temperature ◽  
Large Space Structure ◽  
Fire Smoke ◽  
Resistance Performance

Abstract.The fire smoke is one of the most important factors for the fire temperature field. Once the fire smoke has been exhausted effectively, the fire temperature will be reduced and the fire-resistance performance of steel structures may be improved as well. However, the research on the fire temperature in the space structures is almost bold, which could lead to the theoretical analysis result on fire temperature is quite different from the real condition. Accordingly, the air temperature condition on fire for large-space structures has been analyzed. Taken into account smoke ventilation, the empirical formula for air temperature in large space structure under fire has been modified.

Membrane Modular Structures With Inflatable Tubes and Connective Cables for Future Space Applications

2009 ◽  
Author(s):  
Nobuhisa Katsumata ◽  
Ryoko Fujii ◽  
M. C. Natori ◽  
Hiroshi Yamakawa
Keyword(s):  
Conceptual Models ◽  
Space Structure ◽  
Modular Structure ◽  
Membrane Structures ◽  
Large Space ◽  
Space Applications ◽  
Cable Networks ◽  
Large Space Structure ◽  
Future Space ◽  
Modular Structures

Spirally folded hexagonal membrane structures with inflatable tubes and connective cable networks are presented aiming to establish possible construction scenarios of future large space structure systems over hundreds meters scale and corresponding structures based on the hierarchical modular structure concept using deployable membrane modules. Laboratory scale hand-made conceptual models are manufactured, and their deployment experiments are carried out to show their applicability to the hierarchical modular structures systems.

scholarly journals Fuzzy Coordination Control Strategy and Thermohydraulic Dynamics Modeling of a Natural Gas Heating System for in Situ Soil Thermal Remediation

Entropy ◽  
2019 ◽  
Vol 21 (10) ◽  
pp. 971 ◽  
Author(s):  
Zhai ◽  
Yang ◽  
Li ◽  
Jiang ◽  
Ye ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Natural Gas ◽  
Control Strategy ◽  
Control Strategies ◽  
Heating System ◽  
Coordination Control ◽  
Gas Heating ◽  
Thermal Remediation ◽  
Reduce Energy Consumption

Soil contamination remains a global problem. Among the different kinds of remediation technologies, in situ soil thermal remediation has attracted great attention in the environmental field, representing a potential remedial alternative for contaminated soils. Soils need to be heated to a high temperature in thermal remediation, which requires a large amount of energy. For the natural gas heating system in thermal remediation, a fuzzy coordination control strategy and thermohydraulic dynamics model have been proposed in this paper. In order to demonstrate the superiority of the strategy, the other three traditional control strategies are introduced. Analysis of the temperature rise and energy consumption of soils under different control strategies were conducted. The results showed that the energy consumption of fuzzy coordination control strategy is reduced by 33.9% compared to that of the traditional control strategy I, constant natural gas flow and excess air ratio. Further, compared to the traditional control strategy II, constant excess air ratio and desired outlet temperature of wells, the strategy proposed can reduce energy consumption by 48.7%. The results illustrate the superiority of the fuzzy coordination control strategy, and the strategy can greatly reduce energy consumption, thereby reducing the cost of in situ soil thermal remediation.

scholarly journals Mathematical modeling of transformable space structure dynamics

2019 ◽  
Vol 221 ◽  
pp. 01018 ◽  
Author(s):  
Vladimir Zimin ◽  
Alexey Krylov ◽  
Sergey Churilin ◽  
Zikun Zhang
Keyword(s):  
Strain State ◽  
Element Model ◽  
Space Structure ◽  
Space Structures ◽  
Elastic Rod ◽  
Stress Strain ◽  
Large Space ◽  
Structure Dynamics ◽  
Stress Strain State ◽  
Large Space Structure

Today large space structures are in focus of attention of engineers and designers of rocket and space equipment. In ground-based experiments, it is not always possible to carry out complex tests of large space structure functionality. Therefore, the development of mathematical models describing properly the transformable structure dynamics when they opened from the densely packed transport state to the operating position in the orbit becomes very important. To determine the stress-strain state of the frame elements when it is unfolding the shape of the framework is taken at the moments when relative velocities of the adjacent sections are maximal. Supposed, that at these moments the frame elements are getting on the stops limiting their relative angular displacements, and the structure behaves as an elastic rod with specified characteristics. Numerical analysis of the stress-strain state in the framework is carried out by means of a finite element model. Therefore, the represented mathematical model can be effectively used to predict the functional suitability of such transformable space structures already on the early stages of their development.

Sign in / Sign up

Export Citation Format

Share Document