Xu Chen Gradual Growth
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  • Teaching
    • Introduction to Programming, Robotics, and Computer-Aided Technology
      • Introduction
      • An Engineering Introduction to The Command Line
      • Introduction to Programming and Python
      • Python Syntax
      • Python Flow Control
      • Python Data Types
      • Python Functions
      • Introduction to Robotics
      • Introduction to 3D Printing
      • Introduction to 3D Scanning
    • 3D Printing - Learn by Building
      • Summary
      • Firmware
      • Delta Robot Kinematics
    • Engineering Analysis
      • Introduction
      • Ordinary Differential Equation
      • Linear Algebra
      • Fourier Analysis
      • Partial Differential Equation
      • Vector Algebra
      • Gradient
      • Leibniz Rule
    • Advanced Control Systems I
      • Introduction
      • The Power of Control
      • Terminology
      • Modeling of dynamic systems
      • Laplace transform
      • Inverse Laplace transform
      • Z transform
      • Inverse Z transform
      • Introduction to the state space
      • From state space to transfer functions
      • State-space realization
      • Solution of state equations
      • State-space discretization
      • Transfer function discretization
      • Stability overview and the method of eigenvalue and pole locations
      • Lyapunov Stability
      • Controllability and observability
      • State-space discretization
      • Kalman decomposition
      • State feedback
      • Observers and observer-state feedback
      • Linear Quadratic (LQ) optimal control
    • Introduction To Python For Modern Controls
      • Introduction
      • Setting Up Your Python Environment
      • Frequency Response Analysis of Linear Systems
      • State-Space Representation and Solutions in Python
      • State-Space Realization
      • Stability
      • State Feedback
      • Controllability and Observability
      • Observers
      • Linear Quadratic Optimal Control
    • Advanced Control Systems II
      • Introduction
      • Dynamic programming
      • Discrete-time LQ optimal control
      • Review of probability theory
      • Principle of least squares
      • Kalman filter
      • Linear Quadratic Gaussian problem
      • Principles of feedback design
      • Discretization
      • Loop transfer recovery
      • Frequency-shaped LQ
      • Zero-phase-error tracking control
      • Preview control
      • Internal model principle and repetitive control
      • Disturbance observer
    • Special Topic - Control Parameterization and Loop Shaping
      • Introduction
      • Closed-loop Stability
      • Principles of Feedback Design
      • Linearization
      • Modeling Project Template
      • SISO Youla-Kucera Parameterization
      • Signal Models
      • Pseudo YK Parameterization
      • Model Inversion
      • Project
    • System Identification and Adaptive Control
      • Introduction
      • Discretization and sampling
      • Regressor models
      • Recursive least squares
      • Stability of adaptive systems
      • Parallel adaptation
      • Parameter convergence of adaptation algorithms
      • Internal Model Principle
      • Adaptive pole placement
      • Adaptive disturbance observer
      • Nonlinear system identification
    • Robotics, vision, and mechatronics for manufacturing
      • Introduction
    • _index
    • _index
  • Projects
    • PyHDD Benchmark
    • Slip Severity
    • Boeing Advanced Research Collaboration at UW
    • Adaptive Vibration Control Benchmark
    • American Control Conference 2024
    • Illustrating Number Theory and Controls
    • 2023 IEEE/ASME International Conference on Advanced Intelligent Mechatronics
    • 2024 IEEE/ASME International Conference on Advanced Intelligent Mechatronics
    • Collaborative Robots
    • Composite Manufacturing
    • IEEE/ASME Transactions on Mechatronics
    • Intelligent Grasping
    • Journey to controls
    • New Book!
    • Modeling, Estimation and Control Conference
    • American Control Conference 2021
    • ASME DSCD Technical Committee on Vibrations
    • Boeing Advanced Research Center
    • Dynamic Systems and Control Conference 2016 & 2020
    • International Symposium on Flexible Automation 2020, 2022, 2024
    • UW Advanced Composites Center
    • 2020 IEEE/ASME International Conference on Advanced Intelligent Mechatronics
    • 2021 IEEE/ASME International Conference on Advanced Intelligent Mechatronics
    • A vision for robotics
    • Beyond-Bandwidth Control in High-Speed Precision Mechatronics
    • Focused Section on Machine Learning, Estimation and Control for Intelligent Robotics at International Journal of Intelligent Robotics and Applications
    • Jumping in controls
    • Manufacturing Robotics Training Resources in Northwest U.S.
    • Reliable Additive Manufacturing
    • Robotic Inspection of Complex Metalic Parts
    • Sensing and Control under Constrained Information Feedback
    • Sustainable Additive Manufacturing
    • LaTeX for Controls Research
    • Adaptation over Unsteady Dynamics
  • Recognitions
    • Best Paper on Robotics Award, ASME Dynamic Systems and Control Division
    • Best Student Paper on Vibrations Award, ASME Dynamic Systems and Control Division
    • ARM Champion Award
    • Best Paper, ISCIE/ASME International Symposium on Flexible Automation
    • Boeing Visiting Professorship
    • National Academy of Engineering (NAE) 2023 Frontiers of Engineering Alumnus
    • Mechatronic Systems Outstanding Young Researcher Award
    • UW+Amazon Science Hub Faculty Research Award
    • SME Sandra L. Bouckley Outstanding Young Manufacturing Engineer Award
    • Best Student Paper on Robotics, ASME Dynamic Systems and Control Division
    • Best Paper, ISCIE/ASME International Symposium on Flexible Automation
    • NSF CAREER Award
    • Best Paper on Vibrations Award, ASME Dynamic Systems and Control Division
    • Young Investigator Award, ISCIE/ASME International Symposium on Flexible Automation
  • Publications
    • Learning to Detect Slip through Tactile Estimation of the Contact Force Field and its Entropy Properties
    • Agile Surface Inspection Framework for Aerospace Components Using Unsupervised Machine Learning
    • Effect of Intra-Build Design Parameters on the Fracture Toughness Properties of EBM Ti6Al4V
    • A Robotic Surface Inspection Framework and Machine-Learning Based Optimal Segmentation For Aerospace and Precision Manufacturing
    • AIM 2024: Proceedings of 2024 IEEE/ASME International Conference on Advanced Intelligent Mechatronics
    • ISFA 2024: Proceedings of 2024 ISCIE/ASME International Symposium on Flexible Automation
    • Learned Slip-Detection-Severity Framework using Tactile Deformation Field Feedback for Robotic Manipulation
    • Learning to Detect Slip through Tactile Measures of the Contact Force Field and its Entropy
    • Optimal Loop Shaping and Disturbance Rejection Beyond the Nyquist Frequency using a Forward Model Disturbance Observer and Convex Optimization Based Filter Design
    • Review: Adaptive and Robust Active Vibration Control
    • State-Space System Identification beyond the Nyquist Frequency with Collaborative Non-Uniform Sensing Data
    • A Recursive System Identification with Non-uniform Data under Coprime Collaborative Sensing
    • A Recursive System Identification With Non-Uniform Temporal Feedback Under Coprime Collaborative Sensing
    • Collaborative Robotics, Controls, and Machine Learning for Automated Visual Inspection of Complex Parts and Surfaces
    • Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing
    • Learning to Detect Slip through Tactile Measures of the Contact Force Field and its Entropy
    • Multi-Track Melt Pool Width Modeling in Powder Bed Fusion Additive Manufacturing
    • Understanding and Controlling the Sensitivity of Event Cameras in Responding to Static Objects
    • Least Squares Solution for System Identification with Non-uniform Data under a Coprime Collaborative Sensing Scheme
    • A Review of Aging, Degradation, and Reusability of PA12 Powders in Selective Laser Sintering Additive Manufacturing
    • Preheating Temperature Control and Low-Contrast Imaging Data Analytics for Laser Powder Bed Fusion
    • Microstructure and Microhardness of Electron Beam Melted Ti-6Al-4V Components with Differential Thickness in Initial Deposition Layers
    • Adaptive Lighting for Curved and Nonuniform Objects in Optomechanical Inspection Systems
    • Control-oriented Modeling and Learning of Fast 3-Dimensional Laser-material Interaction from 2-Dimensional Images
    • A Robotic Chess Player and the Impacts of Mechanical and Environmental Setting in Data Collection
    • A Mass-transfer Based Approach to Model and Predict VOC Emission From Selective Laser Sintering With Multiple Printing Parameters
    • Learning Of Fast 3-dimensional Laser-material Interaction From 2-dimensional Images
    • Target Tracking Under Delayed and Irregularly-Sampled Visual Feedback for a Robotic Air-Hockey System
    • A Machine Learning-based Portable Inspection Method For Evaluation Of Tool Surface Condition And Release Coating In Composites Manufacturing
    • Closed-loop Feedback For Additive Manufacturing Simulation
    • Adaptive Illuminance Control
    • Method for Segmenting Images
    • A New Kinetic Modelling of Polyamide 12 Degradation in Selective Laser Sintering
    • An Image Segmentation Framework for In-Situ Monitoring in Laser Powder Bed Fusion Additive Manufacturing
    • Control-oriented In-situ Imaging and Data Analytics for Coaxial Monitoring of Powder Bed Fusion Additive Manufacturing
    • Shape-Adaptive Lighting for Complex Geometries in Automated Visual Inspection
    • Target Tracking Under Delayed and Irregularly-Sampled Visual Feedback for a Robotic Air-Hockey System
    • A Control of Surface Quality in Selective Laser Sintering Additive Manufacturing With Reclaimed Polyamide Materials
    • A Combined Theoretical and Experimental Approach to Model Polyamide 12 Degradation in Selective Laser Sintering Additive Manufacturing
    • Control-oriented Mechatronic Design and Data Analytics for Quality-assured Powder Bed Fusion Additive Manufacturing
    • Provision of Controlled and Consistent Light Distribution Over an Uneven Topography to Maximize Efficacy of Machine-Vision based Defect Identification
    • Adaptive Illuminance Control of Uniform and Uneven Topographies
    • System and Method for Defect Detection in Laser Powder Bed Fusion Additive Manufacturing
    • New Hammerstein Modeling and Analysis for Controlling Melt Pool Width in Powder Bed Fusion Additive Manufacturing
    • Control-Oriented Modeling and Repetitive Control of In-Layer and Cross-Layer Thermal Interactions in Selective Laser Sintering
    • Evaluating Poly (Ether Ether Ketone) Powder Recyclability for Selective Laser Sintering Applications
    • Modeling and Closed-Loop Control of Lights for Consistent and Robotic Inspection of Complex Metallic Parts
    • Process Control of Surface Quality and Part Microstructure in Selective Laser Sintering Involving Highly Degraded Polyamide 12 Materials
    • Quantitative Influences of Successive Reuse on Thermal Decomposition, Molecular Evolution and Elemental Composition of Polyamide 12 Residues in Selective Laser Sintering
    • Focused Section on Machine Learning, Estimation and Control for Intelligent Robotics
    • A New Kinetic Modelling of Polyamide 12 Degradation in Selective Laser Sintering
    • An In-situ Imaging and Data Analytics for Selective Laser Sintering in Presence of System Degradation
    • Closed-loop Feedback For Additive Manufacturing Simulation
    • Local Loop Shaping for Rejecting Band-Limited Disturbances in Nonminimum-phase Systems with Application to Laser Beam Steering for Additive Manufacturing
    • Closed-loop High-fidelity Simulation Integrating Finite Element Modeling with Feedback Controls in Additive Manufacturing
    • New Hammerstein Modeling and Analysis for Controlling Melt Pool Width in Powder Bed Fusion Additive Manufacturing
    • A Collaborative Sensing and Model-based Realtime Recovery of Fast Temporal Flows from Sparse Measurements
    • Active Interlayer Heating for Sustainable Selective Laser Sintering With Reclaimed Polyamide 12 Powders
    • Closed-loop Simulation Integrating Finite Element Modeling with Feedback Controls in Powder Bed Fusion Additive Manufacturing
    • A Factory-Centric Workforce Development Approach for Aerospace Industry
    • H-infinity-based Selective Inversion of Nonminimum-phase Systems for Feedback Controls
    • A Process Control and Interlayer Heating Approach to Reuse Polyamide 12 Powders and Create Parts With Improved Mechanical Properties in Selective Laser Sintering
    • Introduction to the Focused Section on Machine Learning, Estimation and Control for Intelligent Robotics
    • Multivariable Robust Blade Pitch Control Design to Reject Periodic Loads on Wind Turbines
    • Robotic Target Following with Slow and Delayed Visual Feedback
    • Closed-loop High-fidelity Simulation Integrating Finite Element Modeling with Feedback Controls in Additive Manufacturing
    • A Dynamic Target Tracking Under Slow and Delayed Vision Feedback
    • Control-Oriented Modeling and Repetitive Control of In-Layer and Cross-Layer Thermal Interactions in Selective Laser Sintering
    • Following Fast-Dynamic Targets With Only Slow and Delayed Visual Feedback - a Kalman Filter and Model-Based Prediction Approach
    • Model-based Sparse Information Recovery by Collaborative Sensor Management
    • Wide-band Loop Shaping for Modulation of Energy Transmission in Nonminimum-phase Systems
    • Synthesis and Analysis of Multirate Repetitive Control for Fractional-order Periodic Disturbance Rejection in Powder Bed Fusion
    • A Multirate Repetitive Control for Fractional-Order Servos in Laser-Based Additive Manufacturing
    • A Spectral Analysis and Its Implications of Feedback Regulation beyond Nyquist Frequency
    • Periodic Wind Disturbance Rejection using Robust Individual Pitch Control
    • Transmission of Signal Nonsmoothness and Transient Improvement in Add-On Servo Control
    • A Multirate Fractional-Order Repetitive Control for Laser-Aided Additive Manufacturing
    • Discrete-Time Nonlinear Damping Backstepping Control With Observers for Rejection of Low and High Frequency Disturbances
    • Realtime Control-Oriented Modeling and Disturbance Parameterization for Smart and Reliable Powder Bed Fusion Additive Manufacturing
    • Rejecting Fast Narrow-Band Disturbances With Slow Sensor Feedback for Quality Beam Steering in Selective Laser Sintering
    • Control of Dual-stage HDDs with Enhanced Repetitive Disturbance Rejection
    • Adaptive Loop Shaping for Wideband Disturbances Attenuation in Precision Information Storage Systems
    • Disturbance Observer Based Pitch Control of Wind Turbines for Enhanced Speed Regulation
    • A Robust Optimal Design for Strictly Positive Realness in Recursive Parameter Adaptation
    • A Tutorial on Loop-shaping Control Methodologies for Precision Positioning Systems
    • An Inverse-Free Disturbance Observer for Adaptive Narrow-Band Disturbance Rejection With Application to Selective Laser Sintering
    • Data Storage Devices and Methods with Frequency-Shaped Sliding Mode Control
    • Multi-band beyond-Nyquist Disturbance Rejection on a Galvanometer Scanner System
    • Disturbance Observer Based Control Design for Wind Turbine Speed Regulation
    • Multirate Forward-model Disturbance Observer for Feedback Regulation beyond Nyquist Frequency
    • Spectral Distribution and Implications of Feedback Regulation beyond Nyquist Frequency
    • Enhanced Wide-Spectrum Vibration Suppression Based on Adaptive Loop Shaping
    • Extended State Observer with Phase Compensation to Deal with High-frequency Vibrations in Hard Disk Drives
    • Input-to-output Discontinuity and Transient Improvement in Add-on Control Design
    • Multirate Forward-model Disturbance Observer for Feedback Regulation beyond Nyquist Frequency
    • Interlaced Direct Adaptive Regulation Scheme Applied to a Benchmark Problem
    • Disturbance Observer Based Pitch Control of Wind Turbines for Disturbance Rejection
    • Discrete-time Reduced-Complexity Youla Parameterization for Dual-input Single-output Systems
    • Modified Direct Adaptive Regulation Scheme Applied to a Benchmark Problem
    • An Open-source Selective Laser Sintering Additive Manufacturing System
    • Discrete-time Output Feedback Nonlinear Control for Combined Low- and High-frequency Disturbance Compensation
    • Real-time Kinematic Modeling and Prediction of Human Joint Motion in a Networked Rehabilitation System
    • Data Storage Device Comprising Slew Rate Anti-Windup Compensation for Microactuator
    • Overview and New Results in Disturbance Observer based Adaptive Vibration Rejection with Application to Advanced Manufacturing
    • Pseudo Youla-Kucera Parameterization with Control of the Waterbed Effect for Local Loop Shaping
    • Disk Drive Filtering Disturbance Signal and Error Signal for Adaptive Feed-Forward Compensation
    • Adaptive Sliding Mode Spacecraft Attitude Control
    • Adaptive Suppression of High-Frequency Wide-Spectrum Vibrations With Application to Disk Drive Systems
    • Discrete-Time Frequency-Shaped Sliding Mode Control for Audio-Vibration Rejection in Hard Disk Drives
    • Transient Enhancement in Add-On Feedforward Algorithms for High-Performance Mechatronic Systems
    • Selective Iterative Learning Control to Deal With Iteration-Dependent Disturbances
    • A Nonlinear Feedback Control Scheme for Transient Performance Enhancement in Hard Disk Drives
    • New Repetitive Control with Improved Steady-State Performance and Accelerated Transient
    • Methods for Closed-loop Compensation of Ultra-high Frequency Disturbances in Hard Disk Drives and Hard Disk Drives Utilizing Same
    • Optimal Decoupled Disturbance Observers for Dual-Input Single-Output Systems
    • Control Design for Cancellation of Unnatural Reaction Torque and Vibrations in Variable-Gear-Ratio Steering System
    • Reduced-Complexity and Robust Youla Parameterization for Discrete-Time Dual-Input-Single-Output Systems
    • Selective Model Inversion and Adaptive Disturbance Observer for Rejection of Time-varying Vibrations on an Active Suspension
    • Control Methodologies for Precision Positioning Systems
    • Neural-Network Based Automatic PID Gain Tuning in the Presence of Time-Varying Disturbances in Hard Disk Drives
    • Add-on Loop Shaping via Youla Parameterization for Precision Motion Control
    • Inverse-Based Local Loop Shaping and IIR-filter Design For Precision Motion Control
    • Selective Model Inversion and Adaptive Disturbance Observer for Time-Varying Vibration Rejection on an Active-Suspension Benchmark
    • A Convex Optimization Approach for Solving the Robust Strictly Positive Real (SPR) Problem
    • Decoupled Disturbance Observers for Dual-Input-Single-Output Systems With Application to Vibration Rejection in Dual-Stage Hard Disk Drives
    • An Enhanced Repetitive Control Algorithm using the Structure of Disturbance Observer
    • Reduced-complexity Adaptive Youla Parameterization for Broadband-Vibration Rejection in Dual-stage Hard Disk Drives
    • A Minimum Parameter Adaptive Approach for Rejecting Multiple Narrow-Band Disturbances with Application to Hard Disk Drives
    • Spiral Servo Writing in Hard Disk Drives Using Iterative Learning Based Tracking Control
    • A Structure for All Stabilizing Controllers and Its Applications to Narrow-Band Disturbance Rejection in Hard Disk Drives
    • An Indirect Adaptive Approach to Reject Multiple Narrow-Band Disturbances in Hard Disk Drives
    • Unknown Multiple Narrow-band Disturbance Rejection in Hard Disk Drives--an Adaptive Notch Filter and Perfect Disturbance Observer Approach
    • Optimal Plant Shaping for High Bandwidth Disturbance Rejection in Discrete Disturbance Observers
  • Projects
  • Sample_publications
    • Learned Slip-Detection-Severity Framework using Tactile Deformation Field Feedback for Robotic Manipulation
    • Learning to Detect Slip through Tactile Measures of the Contact Force Field and its Entropy
    • A Recursive System Identification With Non-Uniform Temporal Feedback Under Coprime Collaborative Sensing
    • A Review of Aging, Degradation, and Reusability of PA12 Powders in Selective Laser Sintering Additive Manufacturing
    • Adaptive Lighting for Curved and Nonuniform Objects in Optomechanical Inspection Systems
    • Transmission of Signal Nonsmoothness and Transient Improvement in Add-On Servo Control
    • Multirate Forward-model Disturbance Observer for Feedback Regulation beyond Nyquist Frequency
    • Overview and New Results in Disturbance Observer based Adaptive Vibration Rejection with Application to Advanced Manufacturing
    • Pseudo Youla-Kucera Parameterization with Control of the Waterbed Effect for Local Loop Shaping
    • New Repetitive Control with Improved Steady-State Performance and Accelerated Transient
    • Optimal Decoupled Disturbance Observers for Dual-Input Single-Output Systems
    • Selective Model Inversion and Adaptive Disturbance Observer for Time-Varying Vibration Rejection on an Active-Suspension Benchmark
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    • 📈 New Review Paper on Additive Manufacturing
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📈 New Review Paper on Additive Manufacturing

Jan 5, 2023·
Xu Chen
Xu Chen
· 1 min read

New Review Paper A review of aging, degradation, and reusability of PA12 powders in selective laser sintering additive manufacturing published at Materials Today Communications.

Last updated on Jan 5, 2023
Paper Manufacturing
Xu Chen
Authors
Xu Chen

© 2025 Xu Chen. This work is licensed under CC BY NC ND 4.0

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