2023 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2023) Proceedings
Volume II
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Article
Deep learning-based melt pool and porosity detection in components fabricated by laser powder bed fusion
Microstructure analysis is a crucial aspect of additive manufacturing (AM) processes, as it offers valuable insights into material properties, defects, and quality of printed parts. Quantification of microstru...
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Article
Design and Evaluation of a Monitoring Instrument for the High-Energy Proton and TID Effects in LEO
In this paper, we introduce the development and evaluation of the Proton Environment and Total ionizing dose (TID) Effect Monitor (PETEM) onboard a low Earth orbit (LEO) satellite for telecommunication test la...
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Article
A Highly Imbalanced Assembly Vibration Prediction of Aero-engine Using Feature Selection and Data Augmentation
In the process of aero-engine assembly, the vibration value of the whole aero-engine has an important impact on flight safety. To limit the assembly vibration to a reasonable range, the data-driven method is u...
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Article
Alterations in leukocyte telomere length and mitochondrial DNA copy number in benzene poisoning patients
The aim of this study is to examine and evaluate the impact of benzene poisoning on the relative content of the mitochondrial MT-ND1 gene and telomere length in individuals with occupational chronic benzene po...
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Article
Differential contrast guidance for aeroengine fault diagnosis with limited data
Data-driven methods have high requirements for data samples and the ideal state is to have sufficient samples and labels for model training. However, due to the limited sample of aeroengine fault data, existin...
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Book and Conference Proceedings
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Book and Conference Proceedings
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Article
A universal predictor-based machine learning model for optimal process maps in laser powder bed fusion process
The primary bottlenecks faced by the laser powder bed fusion (LPBF) process is the identification of optimal process parameters to obtain high density (> 99.8%) and a good surface finish (< 10 µm) in the fabri...
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Article
Open AccessDetection of magnetospheric ion drift patterns at Mars
Mars lacks a global magnetic field, and instead possesses small-scale crustal magnetic fields, making its magnetic environment fundamentally different from intrinsic magnetospheres like those of Earth or Satur...
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Article
Geochronology, petrogenesis, and geological significance of the quartz vein-type copper deposits in Longwei area, north-west Dayaoshan, Guangxi
Quartz-vein-type copper deposits were discovered in SN-trend ore-bearing structures in north-west Dayaoshan, Guangxi. Lack of reports on the precise metallogenic age of these deposit has become a bottleneck in...
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Article
Artificial modification of Earth’s radiation belts by ground-based very-low-frequency (VLF) transmitters
Wave-particle interactions play a fundamental role in the dynamic variability of Earth’s donut-shaped radiation belts that are highly populated by magnetically trapped energetic particles and characteristicall...
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Chapter
Drag Reduction Control in Turbulent Channel with a Spanwise Traveling Wave of Blowing and Suction
A spanwise traveling wave of blowing and suction method is applied to reduce the drag in a turbulent channel flow with \(Re_{\tau }=180\) ...
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Article
Open AccessOblique-mode breakdown in hypersonic and high-enthalpy boundary layers over a blunt cone
The nonlinear analyses of the hypersonic and high-enthalpy boundary-layer transition had received little attention compared with the widely-studied linear instabilities. In this work, the oblique-mode breakdow...
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Article
Open AccessVery-Low-Frequency transmitters bifurcate energetic electron belt in near-earth space
Very-Low-Frequency (VLF) transmitters operate worldwide mostly at frequencies of 10–30 kilohertz for submarine communications. While it has been of intense scientific interest and practical importance to under...
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Article
Numerical investigation of separation-induced transition in a low-pressure turbine cascade in a low-disturbance environment
In this paper, the separation-induced transition in an LPT (low-pressure turbine) cascade is investigated at low Reynolds number with DNS (direct numerical simulation). The transition process is accurately pre...
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Chapter
Modelling and Numerical Simulation for Flow Control
This study deals with numerical prediction through Improved-Delayed-Detached-Eddy Simulation of the separating-reattaching flow over a backward-facing step and the manipulated flow with harmonic actuation for ...
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Chapter and Conference Paper
On the Thresholds of Vortex Identification Methods
Several vortex identification methods along with a newly proposed \(\Omega \) method are examined in the Burgers vort...
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Chapter and Conference Paper
Research on Hypersonic Boundary-Layer Stability with High-Temperature Effects
High-temperature effects need to be considered for a better design of hypersonic and reentry vehicles. They affect both the boundary layer flow and its flow transition, whose primary stages can be investigate...
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Article
Investigations of an enclosed annular rotor-stator system with LES method
In this study, the flows in an enclosed annular rotor-stator system with the Reynolds number ranging from 0.75×105 to 3.75×105 and an aspect ratio of 36.5 are investigated using the LES method. Few studies have e...
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Chapter and Conference Paper
Gas-Kinetic Scheme for Multiscale Turbulence Simulation
Based on the extended BGK equation, the gas-kinetic scheme (GKS) is developed for fine simulation of high-Reynolds-number turbulence. With the help of existing hybrid RANS/LES models to approximate the effecti...
