PhD supervision
- Active vibration control
- Smart structures
- Rotorcraft dynamics
- Hybrid testing (model-in-the-loop/real-time dynamic substructuring).
Dr Jonathan Luke du Bois
MEng PhD
Profile
Dr Jonathan du Bois is a lecturer in electromechanical engineering, specialising in dynamic systems.
Jonathan's primary research interests lie in active vibration control and hybrid testing, encompassing hydraulic and electromechanical actuation technologies, robot kinematics, modal analysis and adaptive control, with a strong focus on aerospace applications.
Jonathan obtained his Master's degree in Aeronautical Engineering from the University of Bristol in 2002. In 2004 he returned to the University of Bristol to pursue a PhD in adaptive fuselage response suppression for rotorcraft.
Following a brief period as a Visiting Scholar at the University of California, San Diego in 2008, he returned to the University of Bristol to take up a postdoctoral position on the Rotor Embedded Active Control Technologies (REACT) programme with AgustaWestland Helicopters.
Upon completion of this post he was appointed as a Research Associate on the Autonomous Systems Technology Related Airborne Evaluation & Assessment (ASTRAEA) project, developing advanced test facilities for autonomous air-to-air refuelling systems with Cobham Mission Equipment.
Jonathan moved to the University of Bath in 2012 to take up a Lecturing position in the Department of Mechanical Engineering.
Research
Jonathan's research interests lie in the field of dynamics, primarily in the areas of active vibration control and hybrid testing.
Active vibration control is increasingly used in a variety of applications from civil structures to transportation, and an area of particular interest for Jonathan has been that of rotorcraft vibration suppression. He is looking into embedded devices which can be used to create smart structures, and a key facet of this work is the adoption of energy recovery and storage techniques to create low-powered and self-sufficient classes of devices.
The modelling, testing and analysis of these devices and their host systems encompasses aspects of modal analysis, vibration testing, and adaptive and optimal control theory, and Jonathan takes an active interest in developing new methods in these areas.
Physical evaluation of novel components in large and complex systems can be carried out under laboratory conditions using hybrid testing, sometimes called model-in-the-loop or real-time dynamic substructuring. By coupling physical components to numerical simulations of larger systems it is possible to replicate the behaviour of the component as if it were integrated in the system.
Jonathan maintains an interest in these techniques to support the evaluation of his work on smart structures; the techniques cover hydraulic and electromagnetic actuation methodologies, ranging from high-fidelity 1 degree-of-freedom (DOF) interfaces to full 6DOF robot kinematics.
Publications
Articles
MartÃnez, C., Richardson, T., Thomas, P., du Bois, J. L. and Campoy, P., 2013. A vision-based strategy for autonomous aerial refueling tasks. Robotics and Autonomous Systems, 61 (8), pp. 876-895.
Titurus, B., du Bois, J. L. and Lieven, N., 2012. Modeling and testing of a semiactive hydraulic damper in periodic working regimes. AIAA Journal, 50 (4), pp. 844-854.
Adhikari, S., Pastur, L., Lytova, A. and du Bois, J., 2012. Eigenvalue density of linear stochastic dynamical systems: A random matrix approach. Journal of Sound and Vibration, 331 (5), pp. 1042-1058.
du Bois, J. L., Adhikari, S. and Lieven, N. A. J., 2011. On the quantification of eigenvalue curve veering: A veering index. Journal of Applied Mechanics - Transactions of the ASME, 78 (4), 041007.
Titurus, B., du Bois, J. L., Lieven, N. and Hansford, R., 2010. A method for the identification of hydraulic damper characteristics from steady velocity inputs. Mechanical Systems and Signal Processing, 24 (8), pp. 2868-2887.
du Bois, J. L., Lieven, N. A. J. and Adhikari, S., 2009. Error analysis in trifilar inertia measurements. Experimental Mechanics, 49 (4), pp. 533-540.
du Bois, J. L., Adhikari, S. and Lieven, N. A.J., 2009. Eigenvalue curve veering in stressed structures: an experimental study. Journal of Sound and Vibration, 322 (4-5), pp. 1117-1124.
Conference or Workshop Items
Bhandari, U., Thomas, P., Richardson, T. and Du Bois, J., 2013. Forthcoming. Bow wave effect in probe and drogue aerial refuelling. In: AIAA Guidance, Navigation, and Control Conference, 2013-08-19 - 2013-08-22, Boston.
Thomas, P., Richardson, T. and Du Bois, J., 2013. Robotic relative motion reproduction for air to air refuelling simulation. In: 5th European Conference for Aeronautics and Space Sciences, 2013-07-01 - 2013-07-03, Munich.
Du Bois, J., Thomas, P. and Richardson, T., 2012. Control methodologies for relative motion reproduction in a robotic hardware in the loop simulation of aerial refuelling. In: AIAA Guidance, Navigation and Control Conference, 2012-08-13 - 2012-08-16, Minneapolis.
Du Bois, J., Thomas, P. and Richardson, T., 2012. Development of a relative motion facility for simulations of autonomous air to air refuelling. In: IEEE Aerospace Conference, 2012-03-03 - 2012-03-10, Big Sky.
Du Bois, J., Lieven, N. A. J. and Adhikari, S., 2012. A tensioned cable as an adaptive tuned vibration absorber for response suppression in rotorcraft. In: ISMA 2012 International Conference on Noise and Vibration Engineering, 2012-09-17 - 2012-09-19, Leuven.
Du Bois, J. L., Newell, P., Bullock, S., Thomas, P. and Richardson, T., 2012. Vision based closed-loop control systems for satellite rendezvous with model-in-the-loop validation and testing. In: 23rd International Symposium on Space Flight Dynamics, 2012-10-29 - 2012-11-02, Pasadena, California.
Titurus, B., Du Bois, J., Lieven, N. A.j. and Hansford, R., 2010. Model uncertainty in identification of the static characteristics of the hydraulic damper. In: Tenth International Conference on Recent Advances in Structural Dynamics, 2010-07-01, Southampton.
Du Bois, J., Titurus, B. and Lieven, N. A.j., 2010. Transfer dynamics cancellation in real-time dynamic substructuring. In: ISMA 2010 International Conference on Noise and Vibration Engineering, 2010-09-06, Leuven.
Du Bois, J., Adhikari, S. and Lieven, N. A.j., 2009. A new approach to model updating in symmetric structures. In: 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2009-05-01, Palm Springs.
Du Bois, J. L., Lieven, N. A. J. and Adhikari, S., 2009. Localisation and curve veering: A different perspective on modal interactions. In: IMAC XXVII: Conference & Exposition on Structural Dynamics - Model Verification & Validation, 2009-02-09 - 2009-02-12, Orlando, Florida.
Du Bois, J. L., Lieven, N. A. J. and Adhikari, S., 2009. On the role of modal coupling in model updating. In: IMAC XXVII: Conference & Exposition on Structural Dynamics - Model Verification & Validation, 2009-02-09 - 2009-02-12, Orlando, Florida.
Du Bois, J. L., Lieven, N. A.J. and Todd, M., 2009. Towards a wireless powering and interrogation strategy for rotorcraft health monitoring. In: IMAC XXVII: Conference & Exposition on Structural Dynamics - Model Verification & Validation, 2009-02-09 - 2009-02-12, Orlando, Florida.
Du Bois, J., Lieven, N. A. J. and Adhikari, S., 2007. Adaptive passive control of dynamic response through structural loading. In: 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2007-04-22 - 2007-04-25, Honolulu, Hawaii.
Du Bois, J. L., Adhikari, S. and Lieven, N. A. J., 2007. Experimental and numerical investigation of mode veering in a stressed structure. In: IMAC XXV: Conference & Exposition on Structural Dynamics - Celebrating 25 Years of IMAC, 2007-02-12 - 2007-02-22, Orlando, Florida.
