Results 71 to 80 of about 122,703 (243)

Design of Real-Time Database for the Vacuum Cold-Black Environment Simulator

MATEC Web of Conferences, 2018
There is an urgent need to develop a real-time database (RTDB) to handle large amounts of real-time data, to realize process monitoring of vacuum cold-black environment simulation, cold-black environment data acquisition, fault processing, data storage ...
Shao Jingyi, Ning Juan, Liu Yangyang
doaj   +1 more source

Proposed Modifications to Engineering Design Guidelines Related to Resistivity Measurements and Spacecraft Charging [PDF]

, 2005
A key parameter in modeling differential spacecraft charging is the resistivity of insulating materials. This determines how charge will accumulate and redistribute across the spacecraft, as well as the time scale for charge transport and dissipation ...
Green, Nelson, Jost, Randy, Dennison, J. R., Brunson, Jerilyn, Frederickson, A. Robb, Swaminathan, Prasanna, Green, Nelson W., Dennison, John R.   +7 more
core  

Enhanced Control Strategies for Residual‐Vibration Suppression and Adaptive Tracking in Flexible Manipulator Under Unknown Bounded Disturbances

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT This paper proposes a hybrid control strategy for flexible‐link manipulators that combines offline trajectory planning with adaptive tracking to suppress residual elastic vibration (REV) under unknown bounded disturbances. A rigid–flexible coupling dynamics model is first established using the floating‐frame method and Lagrange's equations ...
Mingming Shi, Bao Rong, Xiaoting Rui, Guoping Wang, Xiaoli Dong, Xin Zhao   +5 more
wiley   +1 more source

Effect of Atomic Oxygen on Electric Properties of Graphene Films

Cailiao gongcheng, 2017
The resistance and the surface morphology of the graphene films were studied after atomic oxygen exposure. The graphene films can be etched away during atomic oxygen exposure, the resistance of graphene films decreases at first and then increases.
LIU Yu-ming, LI Man, LIU Xiang-peng, ZHANG Kai, ZHAO Chun-qing   +4 more
doaj   +1 more source

Analysis of Mechanical‐Electrical‐Hydraulic Coupled Vibration Response Characteristics of Thermal Control Circulating Pumps Supported by Water‐Lubricated Bearings

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT The operational reliability of thermal control circulation pumps is significantly restricted by the multi‐physics coupled environment. To reveal the vibration transmission mechanisms and dynamic response characteristics under multi‐field coupled excitations, a multi‐DOF coupled dynamic representation of the overall system, incorporating the ...
Jianfeng Luo, Liukai Hou, Yutao Zou, Kaiyuan Hao, Guangwu Zhou   +4 more
wiley   +1 more source

4D printing and its key technologies

Cailiao gongcheng, 2019
4D printing can be defined as the evolution of 3D printing structure in terms of shape, performance and function. It has time dependence, printer independence and predictability, and its smart dynamic performance creates promising capabilities and broad ...
SHEN Zi-cai, XIA Yan, DING Yi-gang, ZHAO Chun-qing, YANG Yan-bin   +4 more
doaj   +1 more source

An Open Database of Lunar Regolith and Simulants Properties

International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT Lunar regolith, the layer of unconsolidated material covering the Moon's surface, is central to the science and technology developed for the Moon, notably related to in‐situ science investigations, resource utilization, surface infrastructure, and mobility systems.
Léonie Gasteiner, Naomi Murdoch, Olfa D'Angelo   +2 more
wiley   +1 more source

A Dual-Prediction Framework for High-Energy Proton Flux Driven by Graph Neural Networks

IEEE Access
Predicting high-energy proton flux is essential for radiation-effect protection of satellite devices. We introduce a dual-prediction framework based on Graph Neural Networks (GNN) to model proton flux from both non-time-series and time-series ...
Jia Qiao, Xiaoning Yang, Yuming Liu, Yenan Liu, Yaping Cheng   +4 more
doaj   +1 more source

Suboptimal Model Predictive Control With a Computation Governor: Stability, Recursive Feasibility, and Applications to Alternating Direction Method of Multipliers

Optimal Control Applications and Methods, EarlyView.
Computational governor is shown which simultaneously adjusts the reference and adjusts the constraints. ABSTRACT The paper considers a computational governor strategy to facilitate the implementation of Model Predictive Control (MPC) based on inexact optimization when the time available to compute the solution may be insufficient.
Steven van Leeuwen, Ilya Kolmanovsky
wiley   +1 more source

Research on Microvibration Transmission of Control Moment Gyro Considering Internal Structural Flexibility

International Journal of Aerospace Engineering
Control moment gyro (CMG) can produce microvibration and influence the performance of sensitive instruments aboard the spacecraft. This article is aimed at constructing the microvibration transmission model of a large-scale CMG incorporating the ...
Jin You, Wei Zhu, Hao Wang
doaj   +1 more source