Results 41 to 50 of about 42,193 (264)

Characteristic analysis and filtering algorithm design for UNGM model

Xibei Gongye Daxue Xuebao, 2023
The univariate non-stationary growth model (UNGM) is widely used in the verification of nonlinear filters, and the unscented Kalman filter (UKF) is often used as the reference filter for comparative analysis when using this model to evaluate the filter ...
LU Shan, ZHANG Shiyuan
doaj   +1 more source

Microstructure‐Controlled Crack Propagation and Fracture Resistance in MoSiBTiC Alloy Revealed by Multiscale Extended Finite Element Method Modeling

Advanced Engineering Materials, EarlyView.
A two‐dimensional multiscale finite element analysis framework was established for the first‐generation MoSiBTiC alloy, and the mechanical and fracture‐related parameters of the constituent phases were calibrated through experiments and simulations. The framework provides a basis for analyzing crack propagation behavior in its complex microstructure ...
Junfeng Du, Takahiro Kaneko, Xinyu Yan, Takahito Ohmura, Kyosuke Yoshimi   +4 more
wiley   +1 more source

Non-coplanar orbit rendezvous control algorithm based on fixed-impulse single-pulse

Xibei Gongye Daxue Xuebao
To address the challenge of precise rendezvous in non-coplanar orbits, this study proposes an orbital maneuver method based on solid propulsion. The relationship between transfer duration and impulse magnitude is analyzed, and under the constraint of ...
Wu Yinghao, Zang Zhongyuan, Sun Zhaohang, Dai Zhendong, Zhao Weicheng   +4 more
doaj   +1 more source

Research into a Consistency Cooperative Control Method for Attitude Orbit Coupling of SAR Satellite Formations under Communication Constraints

Aerospace, 2022
To solve the problem of communication delays and topology changes and achieve a high-precision formation configuration control index in the flight control of SAR (synthetic aperture radar) satellite formations, this paper studies the consistency ...
Bing Hua, Shengjun Zhong, Yunhua Wu, Zhiming Chen   +3 more
doaj   +1 more source

PWM rectifier control comparison for aerospace applications [PDF]

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014), 2014
High-voltage DC-bus power quality is examined when the power network is supplied by a PWM rectifier controlled using different DC-bus voltage regulation schemes. Three controllers are compared, a voltage oriented control and two model predictive control schemes, predictive current fixed frequency and predictive direct power control.
Todd, R., Liu, K., Lau, Y.
openaire   +3 more sources

Influence of Test Temperature and Test Frequency on Fatigue Life of Aluminum Alloy EN AW‐2618A

Advanced Engineering Materials, EarlyView.
The influence of test temperature and test frequency on the fatigue life of EN AW‐2618A is investigated. High‐cycle fatigue tests are performed at different test temperatures and frequencies on the 1000 h/230°C overaged state. Both test parameters reduce fatigue life due to time‐dependent damage mechanisms.
Ying Han, Julian M. Rosalie, Jan Radners, Mauro Madia, Philipp von Hartrott, Birgit Skrotzki   +5 more
wiley   +1 more source

Analysis and Demonstration of First Cross-Support Interferometry Tracking in China Mars Mission

Remote Sensing, 2022
Delta-Differential One-Way Ranging (DeltaDOR) is widely used in deep spacecraft navigation, and cross support could enhance navigation accuracy with more interferometry baselines and longer baseline.
Songtao Han, Haijun Man, Mei Wang, Zhijin Zhou, Jianfeng Cao, Wei Gao, Lue Chen, Jinsong Ping   +7 more
doaj   +1 more source

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

Development of a new four-disc friction-free ball valve

You-qi chuyun, 2021
In order to solve the problems of large operating torque, easy internal leakage and poor anti-fouling capability of the general ball valves in the oil and gas pipelines, a new type of four-disc friction-free ball valve was designed based on the existing ...
Yulong FENG, Kangxin YANG, Changqun YANG, Xinfeng YANG, Zhenning YANG   +4 more
doaj   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source