Nov 2, 2018.
Our paper "Control of linear instabilities by dynamically consistent order reduction on optimally time-dependent modes" has been acceptted in Nonlinear Dynamics. This new control framework utilizes time-dependent modes to control transient and persistent intstabilities.
Oct 15, 2018.
Our paper "A sequential sampling strategy for extreme event statistics in nonlinear dynamical systems" has been published in the Proceedings of the National Academy of Sciences. The new approach allows for the quantification of extreme event statistics with a very small number of samples. The work is also featured on the MIT News.
Sep 27, 2018.
Our paper "Machine learning the kinematics of spherical particles in fluid flows" has been accepted to Journal of Fluid Mechanics. [pdf]
May 26, 2018.
Our paper "New perspectives for the prediction and statistical quantification of extreme events in high-dimensional dynamical systems" has been accepted to Philosophical Transcations of the Royal Society of London A. [pdf]
May 10, 2018.
Our paper "Data-assisted reduced-order modeling of extreme events in complex dynamical systems" has been accepted to PLOS One. [pdf]
May 1, 2018.
Our paper "Data-driven forecasting of high-dimensional chaotic systems with long-short term memory networks" has been accepted to Proceedings of the Royal Society. [pdf]
Mar 8, 2018.
Our paper "Model order reduction for stochastic dynamical systems with continuous symmetries" has been accepted to SIAM Journal of Scientific Computing. [pdf]
Jan 28, 2018.
The paper "Heavy-tailed response of structural systems subjected to extreme forcing events" has been accepted to ASME - J. Computational and Nonlinear Dynamics. [pdf]
June 27, 2017.
Our paper "Extreme events and their optimal mitigation in nonlinear structural systems excited by stochastic loads: Application to ocean engineering systems" has been accepted to the Ocean Engineering Journal. [pdf]
June 7, 2017.
Mustafa successfully defended his PhD thesis entitled "Direct and adaptive quantification schemes for extreme event statistics in complex dynamical systems". Congratulations Mustafa!
May 20, 2017.
The paper "Reduced-order Description of Transient Instabilities and Computation of Finite-Time Lyapunov Exponents" has been accepted to Chaos. [pdf]
May 16, 2017.
The paper "Ring-based stiffening flexure applied as a load cell with high resolution and large force range" has been accepted to ASME - J. Mechanical Design. [pdf]
May 12, 2017.
Jocie Kluger successfully defended her PhD thesis entitled "Synergistic Design of a Combined Floating Wind Turbine - Wave Energy Converter". Congratulations Jocie!
Apr 18, 2017.
Mustafa awarded the SNAME travel award by MIT-MechE to present work on the quantification of extreme events using adaptive sampling algorithms at the SIAM Conference on Applications of Dynamical Systems. Congratulations Mustafa!
April 5, 2017.
Our paper "Reduced-order prediction of rogue waves in two dimensional water waves" has been accepted to Journal of Computational Physics. [pdf]
Mar 17, 2017.
Saviz Mowlavi wins the best poster award in the 2017 CCE Student Symposium for his work on "Model order reduction for stochastic dynamical systems with continuous symmetries". Congratulations Saviz!
Mar 17, 2017.
Han Kyul successfully defended his PhD thesis entitled "Probabilistic Optimization of Vibrational Systems under Stochastic Excitation Containing Extreme Forcing Events". Congratulations Han Kyul!
Dec 29, 2016.
Congratulations to Hessam Babaee (postdoc in our group) who has accepted an offer to become an Assistant Professor of Mechanical Engineering at University of Pittsburgh. Good luck to your new position Hessam!
Dec 23, 2016.
The paper "Reduced-space Gaussian process regression for data-driven probabilistic forecast of chaotic dynamical systems" has been accepted to Physica D. [pdf]
Oct 12, 2016.
Our paper "Dynamical indicators for the prediction of bursting phenomena in high-dimensional systems" [pdf] has been featured on the Physical Review E: Kaleidoscope.
Oct 5, 2016.
The paper "Energy exchange and localization in essentially nonlinear oscillatory systems: Canonical formalism" has been accepted to ASME - Journal of Applied Mechanics. [pdf]
Aug 26, 2016.
Our paper "Dynamical indicators for the prediction of bursting phenomena in high-dimensional systems" has been accepted to Physical Review E. [pdf]
Jun 26, 2016.
Our paper "A probabilistic decomposition-synthesis method for the quantification of rare events due to internal instabilities" has been accepted to Journal of Computational Physics. [pdf]
Mar 4, 2016.
The recently published JFM paper on the precursors of rogue waves in unidirectional wave fields has been featured as MIT spotlight and selected as the frontpage of the MIT website. It was also reported by The Economist.
Mar 1, 2016.
Our paper "Probabilistic response and rare events in Mathieu's equation under correlated parametric excitation" has been accepted to the Ocean Engineering Journal. [pdf]
Jan 14, 2016.
Prof. Sapsis awarded the 2016 AFOSR - Young Investigator Award.
Feb 8, 2016.
Our paper "A minimization principle for the description of modes associated with finite-time instabilities" has been accepted to the Proceedings of the Royal Society A and featured on its cover page. [pdf]
Jan 5, 2016.
Our paper "Reduced order precursors of rare events in unidirectional nonlinear water waves" has been accepted to Journal of Fluid Mechanics. [pdf]
Dec 15, 2015.
SAND Lab has been awarded a Seed Grant from Simons Center for the Social Brain for research on "Quantification of Learning Algorithm Performance to Inputs of Variable Complexity: Implications for Emotional Intelligence in Autism Spectrum Disorder". More details can be found here.
Dec 15, 2015.
Our paper "A moment-equation-copula-closure method for nonlinear vibrational systems subjected to correlated noise" has just been accepted for publication to Probabilistic Engineering Mechanics. [pdf]
August 31, 2015.
Han Kyul recently presented our work on the mitigation of rare events in random vibrations in the 5th Hyundai Motor Group Global Top Talent Forum. The title of his talk was "Utilization of NES/TMD on Automobiles to Mitigate Vibrational and Shock Energy".
August 25, 2015.
Mustafa recently presented our work on the quantification of extreme events in the ABS University Partnership Symposium. The title of his talk was "Predicting Extreme Waves for Classing Worst-case Design Loads".
August 13, 2015.
Our paper on the design and fabrication of a nonlinear stiffening load cell with high resolution has been accepted to Precision Engineering. The paper can be found here: [pdf].
July 30, 2015.
The paper "Circadian Rhythms in Rho1 Activity Regulate Neuronal Plasticity and Network Hierarchy" has just appeared to Cell. [pdf]
July 3, 2015.
Our paper on the probabilistic description of intemittently unstable systems excited by correlated noise has been accepted to SIAM/ASA Journal on Uncertainty Quantification. The paper can be found here: [pdf].
May 30, 2015.
Our paper on the nonlinear stability of unidirectional wave-groups has been accepted to Physical Review E. The paper can be found here: [pdf].
May 29, 2015.
Mustafa pass his quals. Congratulations!
May 18, 2015.
Jocie is the winner of the 2015 Student Paper Award at the Regional SNAME Competition. Congratulations Jocie!
May 15, 2015.
Jocie awarded the Meredith Kamm Memorial Award as an Outstanding ME Woman Graduate Student. Congratulations Jocie!
May 15, 2015.
Han Kyul awarded the 2015-2016 ISOPE Scholarship for Outstanding Students. Congratulations Han Kyul!
Apr 30, 2015.
Prof. Sapsis awarded the 2015 ONR - Young Investigator Award. See announcement here.
Apr 30, 2015.
Prof. Sapsis awarded the 2015 ARO - Young Investigator Award.
Apr 30, 2015.
Mustafa awarded the M.A. Abkowitz travel award by MIT-MechE to present work on rare events of parametrically excited oscillators at the STAB 2015 Conference to be held on Glasgow, Scotland, UK, from the 14th to the 19th of June 2015. Congratulations Mustafa!
Apr 9, 2015.
Prof. Sapsis will give an invited seminar on April 24, 2015 to the the Mathematics Colloquium at WPI. The title of the seminar will be "Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities".
Mar 11, 2015.
Han Kyul awarded a SNAME Travel Award in Ocean Engineering by MIT-MechE to present work on closure schemes for nonlinear oscillators at the ISOPE 2015 Conference to be held on June 21-26, 2015 in Hawaii. Congratulations Han Kyul!
Feb 23, 2015.
Prof. Sapsis awarded a 2015 Alfred P. Sloan Research Fellowship in Ocean Sciences. Announcement in the New York Times here.
Feb 20, 2015.
Prof. Sapsis will give an invited seminar on March 12, 2015 to the Department of Mechanical & Aerospace Engineering at the University of Florida entitled "Quantification and prediction of rare events in nonlinear waves".
Dec 18, 2014.
SAND Lab has been awarded MISTI Global Seed Funding (MIT-Germany Seed Fund) for a collaborative project with Prof. Franz-Erich Wolter (Leibniz University, Hannover, Germany) and Prof. Sertac Karaman (MIT) on "Reduced-order geometrical modeling of the dynamics of power grids for efficient detection and optimal suppression of critical events".
Dec 5, 2014.
Will has won an early career travel award to present work on rare events in nonlinear waves at the SIAM Conference on Dynamical Systems and its Applications (DS15) to be held on May 17-21, 2015 in Snowbird, UT. Congratulations Will!
Nov 30, 2014.
The paper "Robust energy harvesting from walking vibrations by means of nonlinear cantilever beams" has been accepted to Journal of Sound and Vibration. [pdf]
Oct 5, 2014.
Prof. Sapsis will give an invited seminar to the Department of Mechanical Engineering at the City College University of New York entitled "Quantification and prediction of rare events in nonlinear waves".
Sept 30, 2014.
Two conference papers by the SAND group have been accepted to the DyDESS conference. See Conference Papers for more details.
Sept 28, 2014.
Prof. Sapsis will give an invited seminar to the Center for Atmosphere Ocean Sciences (CAOS) Colloquium at the Courant Institute of Mathematical Sciences (NYU) entitled "Quantification and prediction of rare events in nonlinear waves".
Aug 10, 2014.
Themis Sapsis will be chairing the Session "Nonlinear Energy Transfers and Harvesting" during the ASME IDETC/CIE 2014. In the same session he will also present joint research with Han Kyul Joo on "Performance Buriers for SDOF Energy Harvesters Under Generic Stochastic Excitation".
Jul 18, 2014.
Mustafa has been awarded a full one-year fellowship from American Bureau of Shipping. Congratulations Mustafa!
May 30, 2014.
Han Kyul Joo and Jocie Kluger pass the MechE Qualifying Exams. Congratulations!
May 9, 2014.
Han Kyul Joo submitted his MS thesis entitled "Single-degree-of-freedom energy harvesters with stochastic excitation". Congratulations!
May 3, 2014.
Our paper "Blended particle filters for large dimensional chaotic dynamical systems" will be puplished to the Proceedings of the National Academy of Sciences. [pdf]
May 1, 2014.
The paper "Quantification and prediction of extreme events in a one-dimensional nonlinear dispersive wave model" has been accepted to Physica D. [pdf]
May 1, 2014.
The paper "Performance measures for single-degree-of-freedom energy harvesters under stochastic excitation" has been accepted to Journal of Sound and Vibration. [pdf]
Apr 16, 2014.
Will Cousins will give an invited seminar on the "Probabilistic prediction of extreme water waves" at the MIT SIAM & CCE Seminar Series - Thursday, April 4, 2014 - 4pm | Rm 4-237.
Mar 27, 2014.
SAND Lab has been awarded seed funding from MIT Energy Initiative for a project entitled "Efficient nonlinear energy harvesting from broad-band vibrational sources by mimicking turbulent energy transfer mechanisms". See here for more details.
Mar 26, 2014.
Themis Sapsis and Will Cousins will be giving three talks to the upcoming SIAM UQ Conference 2014. The title of the talks are:
Statistically Accurate Low Order Models for Uncertainty Quantification in Turbulent Dynamical Systems
Statistical Prediction of Extreme Events in Nonlinear Waves
Uncertainty Quantification of Transient Turbulent Flows Using Dynamical Orthogonality
Mar 15, 2014.
Prof. Sapsis will be giving an invited Webinar at the Pacific Northwest National Laboratory - Devision of Computational Science and Mathematics on March 24. The title of the seminar will be "Order-reduction and uncertainty quantification using dynamical orthogonality with applications on the stochastic modeling of chaotic fluid flows".
Mar 26, 2014.
Our paper "On the equivalence of dynamically orthogonal and dynamically bi-orthogonal methods: Theory and Numerical simulations" has been accepted to Journal of Computational Physics. [pdf]
Feb 17, 2014.
Jocie Kluger and Mustafa Mohammad will present their research results on energy harvesting and quantification of extreme events to the ASNE Days 2014.
Feb 11, 2014.
The paper "Sustained High-Frequency Energy Harvesting Through a Strongly Nonlinear Electromechanical System Under Single and Repeated Impulsive Excitations" has been accepted to Journal of Sound and Vibration. [pdf]
Jan 31, 2014.
Jocie Kluger submitted her MS thesis entitled "Nonlinear Beam-Based Vibration Energy Harvesters and Load Cells". Congratulations!
Jan 14, 2014.
A paper by Will Cousins and Themis Sapsis has been submitted. The topic of the paper is the probabilistic analysis of extreme events in a 1D dispersive nonlinear wave model and the development of an inexpensive predictive scheme for their occurance well before they start forming. [pdf]
Nov 27, 2013.
Han Kyul has won a full 5-years fellowship from Samsung Scholarship Foundation. Congratulations Han Kyul!
Nov 17, 2013.
The paper "Sustained dynamical instabilities in coupled oscillators with essential nonlinearities" has been published to ASME Journal of Vibration & Acoustics. [pdf]
Oct 18, 2013.
Prof. Sapsis will be giving an invited Seminar at the Aerospace Computational Design Laboratory Seminar Series at MIT on Nov 15, 12pm.
Oct 16, 2013.
Prof. Sapsis will give an invited talk at the Center for Fluid Mechanics at Brown University on Nov 5, 2013. The title will be "Reduced-order stochastic modeling and probabilistic prediction of turbulent dynamical systems with intermittent or persistent instabilities".
Sep 6, 2013.
Prof. Sapsis is invited to co-organize a mini-symposium on "Computational Methods", together with Professors Harry Dankowicz (UIUC), and Jan Sieber (University of Exeter) for ENOC 2014.
Sep 4, 2013.
Prof. Sapsis is co-organizing with Prof. Majda (NYU) a mini-symposium on uncertainty quantification of turbulent systems for the SIAM UQ Conference 2014.
Aug 19, 2013.
Paper on stochastic closures of turbulent systems appears in PNAS. With the new approach we are able to predict quantities of interest such as energy with only 0.2% of the original DOF. [pdf]
Aug 17, 2013.
Our paper "Global analysis of Navier-Stokes and Boussinesq stochastic flows using dynamical orthogonality" has just been accepted for publication to JFM. [pdf]
Sept 22, 2017.