The research team in the Hoelzle Research Lab (HRL) investigates emerging control laws for application to myriad manufacturing problems. Broadly classified, we are interested in high-value added microscale manufacturing applications with impacts in both human health and sensor technology. The key applications are engineered synthetic tissues, microfluidic devices for the sorting and enrichment of cells with a targeted phenotype, and microscale electrical and electro-optic circuits. Our key expertise lies in learning-based control algorithms, sensor development, and system design.
|GRADUATION DATE||CURRENT EMPLOYER / INSTITUTION|
|A. James Schmidt||May 2014||
Dept. of Electrical and Computer Engineering
|Joe Williams||May 2013||Phillips Medisize|
There are traditional ‘old-guard’ technologies for the manufacture of engineered tissues, microfluidic devices, and electrical and electro-optical circuits: Beyond autologous tissue and allogeneic tissue transplantation, widely accepted engineered synthetic tissues are manufactured in bulk with a generic form factor and a randomly distributed, hence non-specific, microstructure; Microfluidic devices manufactured by soft-lithography are largely passive devices with ex situ actuation, hence actuation lag; Electronic and electro-optical circuits manufactured by lithographic micromachining are not reconfigurable without capital investment. We, at the HRL, design advanced control laws and sensored and actuated systems to overcome some of the short-comings of the ‘old-guard’ manufacturing technologies - with the motivation of more specific and targeted therapeutic treatments and less expensive communication circuits.
We believe that developing manufacturing systems for improving human health and inexpensive optical networks are just and worthwhile research endeavors. However, beyond the societal implications of such research, we leverage a multi-disciplinary toolset that continually exposes members of the HRL to emerging research in biology, micro/nano-technology and systems integration; broad exposure gives us interesting and just plain cool toys to work with. For some HRL members, their mornings may be spent in Notre Dame’s Class 100 cleanroom in the new Stinson-Remick building and the afternoon in the bio-hood collaborating with cell biologists to test a new device on live cancer cells. As a PI, I believe that interesting technologies and clearly constructed objectives and rationales are the best way to motivate students. I do not demand results or count the hours spent in lab, instead I believe it is my job to construct projects that are so engaging that the results just happen. Not every day will be outstanding – you have to solder up an op-amp if you want to control a high-speed oscillator in a microfluidic device – but my hope is that the mundane will be worthwhile when the student is engrossed in accomplishing the ultimate objective.
Autogolous bone grafts - bone grafts harvested and then transplanted into the same patient - are the 'gold standard' in tissue regeneration for the treatment of bone defects. However, there are many complications - including lack of supply and donor site pain / morbidity - that make autogolous bone solutions sub-optimal. We are developing bioceramic synthetic scaffolds - synthetic extracellular matrices that support bone remodeling - that are biocompatible and can be designed on both the macroscopic and microscopic level. Scaffolds are fabricated using an AM system that is particularly adept at fabricating porous ceramic structures, micro-Robotic Deposition. Current research thrusts are the development of near-net shape structures and improvement of fabrication accuracy through advanced controls.
ILC is a control methodology that exploits process repetition to achieve extremely precise trajectory tracking. ILC is best applied to mass manufacturing problems where repeated trajectories are common. Similarly, AM systems employ repeated trajectory sub-components, or motion primitives. In constrast, AM systems are flexible manufacturing systems in which their usefulness is derived from their ability to change the fabricated part, hence trajectory, from part to part. Current research investigates modifications to ILC for AM at the microscale, to enable precise trajectory tracking, but in a control formulation that allows for continual and facile rearrangements of trajectories.
We, with our collaborators, are currently writing active microfluidic device manuscripts. Therefore, this section will be fairly terse until publication. In general, we would like to apply ideas and concepts from mass manufacturing and control - measurement, actuation, and regulation - to microfluidic devices for advanced detection and materials synthesis. This research initiative is multidisciplinary, leveraging tools and expertise in lithographic micromachining, control, signal processing, and system design.
I. Lim, K.L. Barton, and D.J. Hoelzle, “Spatial ILC for Multi-Objective Systems,” To Appear in
the Proceedings of the 2014 ASME Dynamic Systems and Control Conference, San Antonio, TX,
Oct. 22 – 24, 2014.
D.J. Hoelzle, "Flexible Adaptation of Iterative Learning Control with Applications to Synthetic
Bone Graft Manufacturing," University of Illinois at Urbana-Champaign, Urbana, IL, 2011 Download
D.J. Hoelzle, "Reliability Guidelines and Flowrate Modulation for a Micro Robotic Deposition
System," University of Illinois at Urbana-Champaign, Urbana, IL, 2007 Download
August 18, 2014: The lab welcomes new graduate students Thomas Storey and Dewen Yushu! Thomas graduated with his bachelors in Mechanical Engineering from the University of Portland and Dewen graduated with her bachelors in Materials Science from Huazhong University of Science and Technology.
July 22, 2014: The research team of Dr. Hoelzle and Dr. Kira Barton (Dept. of Mechanical Enigneering, University of Michigan) is awarded a grant from the NSF CMMI Sensors, Dynamics, and Control program.
May 20, 2014: The research team of Dr. Jeremy Zartman (Notre Dame Dept. Chemical and Biomolecular Engineering), Dr. Hoelzle, and Dr. Mark Alber (Notre Dame Dept. of Applied and Computational Mathematics and Statistics) is awarded a grant from the NSF CBET Biotechnology, Biochemical, and Biomass Engineering program.
May 18, 2014: Undergraduate researcher James Schmidt graduates from Notre Dame with a triple major in Mathematics, Mechanical Engineering, and Philosophy. Congrats! James will start a Ph.D. program in Electrical and Computer Engineering at the University of Illinois Urbana-Champaign in the Fall.
May 12, 2014: Max Kennard joins the lab as an undergraduate researcher. Welcome!
January 14, 2014: Jay Dawahare joins the lab as an undergraduate researcher. Welcome!
September 12, 2013: Two undergraduate researchers, Danny Muldoon and Peter Nguyen, join the lab. Welcome!
September 5, 2013: James Schmidt joins the lab as an undergraduate researcher. Welcome!
May 19, 2013: Joe Williams graduates with his Bachelors degree from the Dept. Aerospace and Mechanical Engineering. He will start at Phillips Medisize after traveling around Europe this summer.
May 17, 2013: Dr. Hoelzle receives the Dept. of Aerospace and Mechanical Engineering Award for Excellence in Teaching for the Spring 2013 Semester.
February 4, 2013: Two more undergraduate researchers, Matthew Nagy and Sebastian Ortega, join the lab. Welcome!
December 28, 2012: Inaugural members Julia Concelman, Jacob Pellegrini, and Joseph Williams join the lab.
December 1, 2012: The Hoelzle Research Lab is officially established. Many productive years ahead!
The lab is currently in development. In due time we will have the following equipment:
Want to borrow or access our equipment? Please send all equipment requests to Dr. Hoelzle.
Please direct all requests to Dr. Hoelzle:
141 Multidisciplinary Research Building
Dept. of Aerospace and Mechanical Engineering
University of Notre Dame
Notre Dame, IN 46556
Ph: (574) 631-2291
dhoelzle at nd dot edu
Dr. Hoelzle receives multiple requests a day regarding sponsored graduate work. Only students who have applied to the University of Notre Dame will be considered. If you have applied, please state that you "have applied to the Dept. of X Engineering" in the first line of your email, where X is the relevant Department.
University of Notre Dame Undergraduate Students:
Please email Dr. Hoelzle a statement of your research interests and a current resumé. This information will facilitate a discussion of possible research projects.