Results 31 to 40 of about 379,882 (307)

A High-Accuracy, High Anti-Noise, Unbiased Frequency Estimator Based on Three CZT Coefficients for Deep Space Exploration Mission

Sensors, 2022
Deep space exploration navigation requires high accuracy of the Doppler measurement, which is equivalent to a frequency estimation problem. Because of the fence effect and spectrum leakage, the frequency estimation performances, which is based on the FFT
Weitao Lu, Lue Chen, Zhen Wang, Jianfeng Cao, Tianpeng Ren   +4 more
doaj   +1 more source

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

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

Bistable Mechanisms 3D Printing for Mechanically Programmable Vibration Control

Advanced Engineering Materials, EarlyView.
This work introduces a 3D‐printed bistable mechanism integrated into tuned mass dampers (TMDs) for mechanically adaptive passive vibration suppression. Through optimized geometry, the bistable design provides adaptable vibration reduction across a broad range of scenarios, achieving effective vibration mitigation without complex controls or external ...
Ali Zolfagharian, Frédéric Demoly, Mohammad Lakhi, Bernard Rolfe, Mahdi Bodaghi   +4 more
wiley   +1 more source

Good-Quality and High-Efficiency Dicing for Thick LiNbO₃ Wafers Using Picosecond Laser Pulses

Micromachines, 2019
Lithium niobate (LiNbO3) has become popular with applications in electronics and communication industries due to its excellent electro-optical and nonlinear properties.
Mingwei Lei, Wenyan Gao, Guang Li, Xinping Wu, Benhai Li, Xuefeng Wang, Junlong Wang   +6 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

Enhancing Corrosion Resistance and Mechanical Strength of 3D‐Printed Iron Polylactic Acid for Marine Applications via Laser Surface Texturing

Advanced Engineering Materials, EarlyView.
Laser surface texturing significantly improves the corrosion resistance and mechanical strength of 3D‐printed iron polylactic acid (Ir‐PLA) for marine applications. Optimal laser parameters reduce corrosion by 80% and enhance tensile strength by 25% and ductility by 15%.
Mohammad Rezayat, Mojtaba Karamimoghadam, Mohammadreza Lalegani Dezaki, Ali Zolfagharian, Giuseppe Casalino, Antonio Mateo, Mahdi Bodaghi   +6 more
wiley   +1 more source

Implementation of unknown parameter estimation procedure for hybrid and discrete non‐linear systems

IET Radar, Sonar & Navigation
The application of the hybrid extended Kalman filter (HEKF), hybrid unscented Kalman filter (HUKF), hybrid particle filter (HPF), and hybrid extended Kalman particle filter (HEKPF) is discussed for hybrid non‐linear filter problems, when prediction ...
Mahdi Razm‐Pa
doaj   +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

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source