headshot

Stephen Ludwick

Associate Professor
Adjunct Associate Professor
Mechanical Engineering & Materials Science

overview

Stephen Ludwick has served as an Adjunct Faculty in the department since 2007. He is a practicing design engineer focusing on the design and control of high-accuracy motion control systems. He is presently employed by Aerotech, Inc. in Pittsburgh, PA.

about

(2014) Distinguished Service Award, American Society for Precision Engineering.

(2013) Visiting Committee Award, Department of Mechanical Engineering and Materials Science, University of Pittsburgh.

(1999) Carl G. Sontheimer Prize for "Excellence in Innovation and Creativity in Design" in the MIT Mechanical Engineering Department.

(1995) National Science Foundation Graduate Student Fellowship.

PhD, Mechanical Engineering, Massachusetts Institute of Technology, 1999

SM, Mechanical Engineering, Massachusetts Institute of Technology, 1996

BS, Mechanical Engineering & Engineering and Public Policy, Carnegie Mellon University, 1994

Schmitz, T., & Ludwick, S. (2020). Selected papers from the 34th Annual Meeting of the American Society for Precision Engineering. PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY, 64, 210.Elsevier BV. doi: 10.1016/j.precisioneng.2020.03.022.

Cheng, L., Liang, X., Belski, E., Wang, X., Sietins, J.M., Ludwick, S., & To, A. (2018). Natural Frequency Optimization of Variable-Density Additive Manufactured Lattice Structure: Theory and Experimental Validation. JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME, 140(10).ASME International. doi: 10.1115/1.4040622.

Wang, X., Zhang, P., Ludwick, S., Belski, E., & To, A.C. (2018). Natural frequency optimization of 3D printed variable-density honeycomb structure via a homogenization-based approach. ADDITIVE MANUFACTURING, 20, 189-198.Elsevier BV. doi: 10.1016/j.addma.2017.10.001.

Bucci, B.A., Cole, D.G., Ludwick, S.J., & Vipperman, J.S. (2013). Nonlinear Control Algorithm for Improving Settling Time in Systems With Friction. IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, 21(4), 1365-1373.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/TCST.2012.2206812.

Bucci, B.A., Vipperman, J.S., Cole, D.G., & Ludwick, S.J. (2013). Evaluation of a servo settling algorithm. PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY, 37(1), 10-22.Elsevier BV. doi: 10.1016/j.precisioneng.2012.04.006.

Spiewak, S.A., Ludwick, S.J., & Hauer, G. (2013). A Test Setup for Evaluation of Harmonic Distortions in Precision Inertial Sensors. In Paper no. IMECE2008-68066. JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME, 135, (pp. 192-207).ASME International. doi: 10.1115/1.4023706.

Allison, B.T., Ludwick, S., & Birmingham, W.P. (2012). A mechatronics capstone project with an interdisciplinary team and an industrial partner. ASEE Annual Conference and Exposition, Conference Proceedings.

Bucci, B., Cole, D., Ludwick, S., & Vipperman, J.S. (2012). A Nonlinear Control Algorithm for Reducing Settling Time in High-Precision Point to Point Motion. IEEE Transactions on Control System Technology, (99).

Ludwick, S.J., & Profeta, J.A. (2010). A USER'S guide to repetitive control systems and the internal model principle. Proceedings - ASPE Spring Topical Meeting on Control of Precision Systems, ASPE 2010, 48, (pp. 55-58).

Schmidt, E., De Cuyper, J.P., Winter, L., Ciez, A., & Ludwick, S. (2010). Design of a precision scanning system for digitising aero and astro photographic images. Proceedings of the 10th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2010, 1, (pp. 372-375).

Ludwick, S.J. (2008). Describing nanometer-level errors in precision motion control stages. Proceedings - ASPE Spring Topical Meeting on Precision Mechanical Design and Mechatronics for Sub-50nm Semiconductor Equipment, ASPE 2008, 43, (pp. 44-47).

Spiewak, S., Ludwick, S., Hauer, G., & Mozaryn, J. (2008). Generation of accurate translational motion for testing inertial sensors. Proceedings of the 10th Anniversary International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2008, 1, (pp. 222-226).Zurich, Switzerland.

Ludwick, S.J. (2007). Motorization of precision bearings and spindles. Proceedings - ASPE Summer Topical Meeting on Precision Bearings and Spindles, ASPE 2007, 41, (pp. 55-59).

Byl, M.F., Ludwick, S.J., & Trumper, D.L. (2005). A loop shaping perspective for tuning controllers with adaptive feedforward cancellation. PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY, 29(1), 27-40.Elsevier BV. doi: 10.1016/j.precisioneng.2004.04.005.

Ludwick, S. (2004). Precision Positioning of Rotary and Linear Systems. In Robotics and Automation Handbook. CRC Press. doi: 10.1201/9781420039733.ch13.

Ludwick, S.J., Chargin, D.A., Calzaretta, J.A., & Trumper, D.L. (1999). Design of a rotary fast tool servo for ophthalmic lens fabrication. PRECISION ENGINEERING-JOURNAL OF THE AMERICAN SOCIETY FOR PRECISION ENGINEERING, 23(4), 253-259.Elsevier BV. doi: 10.1016/S0141-6359(99)00017-3.

Trumper, D.L., & Ludwick, S.J. (1999). Development of 2.737 Mechatronics at MIT. 1999 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (Cat. No.99TH8399), (pp. 446-451).IEEE.Atlanta, GA. doi: 10.1109/aim.1999.803210.

Ludwick, S.J., Jenkins, H.E., & Kurfess, T.R. (1998). Design and implementation of a tube wall thickness measurement system. JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME, 120(2), 471-475.ASME International. doi: 10.1115/1.2830149.

Jenkins, H.E., Kurfess, T.R., & Ludwick, S.J. (1997). Determination of a dynamic grinding model. JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME, 119(2), 289-293.ASME International. doi: 10.1115/1.2801248.

Ludwick, S.J., & Trumper, D.L. (1996). Noise optimal control in a fluid-floated magnetic positioner. American Society of Mechanical Engineers, Dynamic Systems and Control Division (Publication) DSC, 58, (pp. 309-316).Atlanta, GA.

Ludwick, S.J., Jenkins, H.E., & Kurfess, T.R. (1996). Design and implementation of a tube wall thickness measurement system. Proceedings of the Japan/USA Symposium on Flexible Automation, 2, (pp. 1189-1192).Boston, MA.

Ludwick, S.J., Trumper, D.L., & Holmes, M.L. (1996). Modeling and control of a six degree-of-freedom magnetic/fluidic motion control stage. IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, 4(5), 553-564.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/87.531921.

Ludwick, S.J., Trumper, D.L., & Holmes, M.L. (1995). Design and control of a six degree-of-freedom magnetic/fluidic motion control stage. American Society of Mechanical Engineers, Dynamic Systems and Control Division (Publication) DSC, 57-1, (pp. 511-518).San Francisco, CA.

Ludwick, S.J., Jenkins, H.E., & Kurfess, T.R. (1994). Determination of a dynamic grinding model. American Society of Mechanical Engineers, Dynamic Systems and Control Division (Publication) DSC, 55-2, (pp. 843-849).Chicago, IL.

Belski, E., Duncan, N., & Ludwick, S. (2020). Success and failure in friction identification, simulation, and compensation for precision motion stages. In Proceedings - 35th ASPE Annual Meeting, (pp. 138-142).

Vogl, G.W., Fesperman, R.R., Ludwick, S., Klopp, R.W., Grabowski, A., Lebel, J., Miller, J.A., Brown, N.L., Belski, E., Duncan, N., & Hennessey, C.W. (2020). Development of a new standard for the performance evaluation of single axis linear positioning systems. In Proceedings - 35th ASPE Annual Meeting, (pp. 128-133).

Brouwer, D.M., & Ludwick, S.J. (2016). Trends in control techniques for precision mechatronic systems. In Proceedings - ASPE 2016 Annual Meeting, (pp. 82-86).

Brouwer, D.M., Ludwick, S.J., Okwudire, C.E., & Peijenburg, T.T.A. (2016). Trends in control techniques for precision mechatronic systems. In Proceedings - 32nd ASPE Annual Meeting, (pp. 46-51).

Cheng, L., Belski, E., Ludwick, S., Oskin, J., & To, A. (2016). Lattice structure topology optimization for lightweight additive manufactured design: Experimental validation and dimensional accuracy. In Proceedings - ASPE/euspen 2016 Summer Topical Meeting: Dimensional Accuracy and Surface Finish in Additive Manufacturing, (pp. 93-97).

Ryan, T.S., Ludwick, S.J., & Vipperman, J.S. (2016). Toward a modeling framework for linear stages. In Proceedings - ASPE 2016 Annual Meeting, (pp. 234-239).

Ludwick, S.J. (2015). Dynamic modeling of an H-type precision gantry including base motion effects. In Proceedings - ASPE 2015 Annual Meeting, (pp. 293-298).

Ellis, J.D., & Ludwick, S. (2013). Methods for performance evaluation of single axis positioning systems: Move and settle performance. In Proceedings of the 28th Annual Meeting of the American Society for Precision Engineering, ASPE 2013, (pp. 493-497).

Fesperman, R., Brown, N., Elliott, K., Ellis, J., Grabowski, A., Ludwick, S., Maneuf, S., O'Connor, B., & Woody, S. (2013). Methods for performance evaluation of single axis positioning systems: A new standard. In Proceedings of the 28th Annual Meeting of the American Society for Precision Engineering, ASPE 2013, (pp. 498-503).

Ludwick, S.J. (2013). Progress on defining standard tests for quantifying servo system tuning. In Proceedings of the 28th Annual Meeting of the American Society for Precision Engineering, ASPE 2013, (pp. 510-511).

Spiewak, S., Zaiss, C., & Ludwick, S.J. (2013). High Accuracy, Low-Invasive Displacement Sensor (HALIDS). In Volume 2A: Advanced Manufacturing, 2 A.American Society of Mechanical Engineers. doi: 10.1115/imece2013-66767.

Allison, B.T., Ludwick, S., & Birmingham, W.P. (2012). A mechatronics capstone project with an interdisciplinary team and an industrial partner. In ASEE Annual Conference and Exposition, Conference Proceedings.

Kirsch, N.A., Cole, D.G., Vipperman, J.S., & Ludwick, S.J. (2011). Characterization of periodic disturbances in rolling element bearings using an optical sensor. In Proceedings - ASPE 2011 Annual Meeting, 52, (pp. 165-168).

Bucci, B.A., Cole, D.G., Vipperman, J.S., & Ludwick, S.J. (2010). Practical friction compensation for ultra precision point-to-point motion. In Proceedings - ASPE 2010 Annual Meeting, 50, (pp. 109-112).

Spiewak, S., Ludwick, S., & Hauer, G. (2010). Attenuation of ambient disturbances in high performance translational exciters. In Proceedings of the 10th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2010, 1, (pp. 396-399).

Spiewak, S., Ludwick, S., Hauer, G., Selvakumar, A., & Lawrence, E. (2010). Acceleration based evaluation of motion errors in a high performance translational exciter. In Proceedings of the 10th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2010, 1, (pp. 421-424).

Bucci, B.A., Cole, D.G., Vipperman, J.S., & Ludwick, S.J. (2009). Friction modeling of linear rolling element bearings in high precision linear stages. In Proceedings of the 24th Annual Meeting of the American Society for Precision Engineering, ASPE 2009.

Spiewak, S., Ludwick, S., Selvakumar, A., Doyle, M., Hauer, G., & Lawrence, E. (2009). Generation of accurate periodic motion for the identification of nonlinear phenomena in MEMS sensors. In Proceedings of the 9th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2009, 1, (pp. 260-263).

Spiewak, S., Ludwick, S., Selvakumar, A., Doyle, M., Hauer, G., & Lawrence, E. (2009). Model based compensation of vibration rectification in precision inertial sensors. In Proceedings of the 9th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2009, 1, (pp. 406-409).

Spiewak, S., Hauer, G., & Ludwick, S.J. (2008). Evaluation of harmonic distortions in precision inertial sensors. In Proceedings of the 23rd Annual Meeting of the American Society for Precision Engineering, ASPE 2008 and the 12th ICPE.

Spiewak, S.A., Ludwick, S.J., & Hauer, G. (2008). A Test Setup for Evaluation of Harmonic Distortions in Precision Inertial Sensors. In Volume 13: Nano-Manufacturing Technology; and Micro and Nano Systems, Parts A and B, 13(PART A), (pp. 197-207).ASMEDC. doi: 10.1115/imece2008-68066.