Wednesday, November 22, 2017

Updated on the 2nd FACAM Workshop at USC

The 2nd FACAM (Foundation of Accuracy Control for Additive Manufacturing) Workshop will be held at USC on February 8th and 9th, 2018.  Currently we have participants from
  • Purdue University
  • Florida State University
  • Northwestern University
  • École Normale Supérieure (ENS) Paris-Scalay
  • Politecnico di Milano (Polimi)
  • HP Labs at Palo Alto
  • University of Nebraska-Lincoln
  • Mississippi State

Saturday, October 21, 2017

Bayesian Model Building From Small Samples of Disparate Data for Capturing In-Plane Deviation in Additive Manufacturing (accepted by Technometrics)

Quality control of geometric shape deviation in additive manufacturing relies on statistical deviation models. However, resource constraints limit the manufacture of test shapes, and consequently impede the specification of deviation models for new shape varieties. In this paper, which was recently accepted by Technometrics, Dr. Arman Sabbaghi, Dr. Qiang Huang, and Dr. Tirthankar Dasgupta present an adaptive Bayesian methodology that effectively combines in-plane deviation data and models for a small sample of previously manufactured, disparate shapes to aid in the model specification of in-plane deviation for a broad class of new shapes. The power and simplicity of this general methodology is demonstrated with illustrative case studies on in-plane deviation modeling for polygons and straight edges in free-form shapes using only data and models for cylinders and a single regular pentagon. Their new Bayesian approach facilitates deviation modeling in general, and thereby can help advance additive manufacturing as a high-quality technology. More details about this paper can be found at the following link:

Thursday, September 14, 2017

New Article on Shrinkage Compensation

I just published an article on shrinkage compensation in FDM process. I used shrinkage as a tool to compensate for shrinkage. You may have a look at the paper from the following link.

Thursday, August 10, 2017

Research Assistant Positions Available

RA positions are available for dedicated and motivated students working on Advanced Manufacturing (Additive Manufacturing or Nanomanufacturing) at Prof. Huang's Lab. Students with engineering background and analytical training are encouraged to apply. (Email: qiang.huang@usc.edu)

The 2nd FACAM Workshop Will be Held at USC on February 8th & 9th, 2018

With the generous support from Epstein Institution at USC's Viterbi School of Engineering, the 2nd FACAM workshop will be held at USC on February 8th & 9th, 2018.

Limited seats might be open to public for sessions on February 8th, 2018.  Please contact Prof. Huang at qiang.huang@usc.edu for more information.

Thursday, June 29, 2017

PhD student He Luan works at summer intern at HP Labs on 3D Printing

https://newsblog.ext.hp.com/t5/HP-newsroom-blog/Summer-2017-interns-at-HP-Labs-He-Luan/ba-p/981


As an undergraduate majoring in robotics and intelligent systems at the University of Science and Technology of China, He Luan was introduced to a new but fast growing engineering field: 3D printing. “It gave me an idea of how revolutionary 3D printing could become in terms of how we make things and also what the challenges were to improving it,” she recalls. The insight spurred Luan to enroll in the Ph.D. program in industrial and systems engineering at the University of Southern California, where she specializes in applying data and statistical learning to 3D printing research and applies knowledge gained from her studies in USC’s computer science master’s degree program.
HP: What’s your HP Labs research project this summer?
A major initiative in the Print Adjacencies and 3D Lab explores ways to analyze job data and data from heat sensors in HP’s 3D printers to predict how well the printing process is working and then asks how we can use those predictions to optimize the process. As part of that effort, I’m applying deep learning to these data sets and exploring different neutral network architectures to predict the thermal behavior of each layer of material as it is printed. If we are successful, our goal is to use this model to make the machines print even more precisely than they can at present.
HP: How has it been going so far? 
I’m in my sixth week of fourteen and I have an outline for what I hope to achieve and a plan for getting there. The data source is very rich and there’s deep science inside our printing physics, so it’s a challenge. We are actually designing our own neutral network architectures.  We’ve done some preliminary tests. So far so good.  
HP: What’s the value of using deep learning here? 
We are trying to predict thermal behavior using models derived from physical sciences. The challenge is that thermal behavior in a 3D printer is incredibly complex. Other HP research teams are running a lot of experiments to help us to uncover the underlying interactions, and thanks to our collaborators in HP’s 3D printing business unit, we have great access to that data. Deep learning allows us to examine all the different data sources and automate the discovery process for the underlying inter-connectivity between different factors. By applying deep learning to the data, we’re hoping to reveal information patterns that allow us to predict thermal behavior and help us to build even more accurate physical models.
HP: What is the biggest challenge you face in doing this work?
Our problem is a bit different from a typical deep learning problem like video prediction, for example. In our case the predictions we come up with have to be very high resolution – at the scale of a prediction per voxel (the 3D equivalent of a pixel). That’s not always something you need in a typical deep learning application - when it can be enough just to be pointed in a better direction. Like most recurrent neutral network problems, we have both tempo and spatial components. Our system is different in that we have external spatial excitations in the form of agent amount data flowing to the printheads. To attack that, our “Big Idea” is to generate a new, scalable network structure. We may write an invention disclosure by the end of summer if we have good results.
HP: How does your HP work relate to your academic research?
My Ph.D. advisor has been collaborating with HP. In fact, he is visiting HP’s 3D printing group in Barcelona next month. My dissertation is looking at ways to improve geometric accuracy, or what we call geometrical fidelity control, in 3D printing. This is one of the leading problems that HP is interested in. I am definitely hoping to continue working with HP Labs after my internship.  I’d love to help some of the ideas we cook up over the summer find their way into products.