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Welcome

The AIMS Lab at the University of Michigan (Umich) is run by Dan Inman and investigates methods of advancing the field of aerospace engineering through energy harvesting, structural damping, and aircraft morphing.

 

Research


It is the culmination of the study of controls, fluid dynamics, structural dynamics, and materials science that make up aerospace engineering as a whole. What makes the AIMS Lab unique is that our research embraces many of these fields. Overall, we strive to develop innovative and novel solutions to complex aerospace engineering dilemmas via smart materials and structures but we take a multidisciplinary approach by working at the intersection of simulated and experimental structural dynamics. Ultimately, this applies to a wide variety of research including energy harvesting, structural damping, and aircraft morphing.  

“If we worked on the assumption that what is accepted as true really is true, then there would be little hope for advance “-Orville Wright

Structural Damping

As aerospace structures become lighter and more flexible, vibration levels become an issue. Accordingly, engineers are in a persistent battle to reduce vibrations in the structures we build. While typically harmless, they are capable of causing catastrophic failure and putting civilian lives at risk. In order to mitigate these unwanted vibrations the structure is damped, frequently by adding rubber-like damping material or transferring the vibrational energy to a separate oscillator designed to vibrate at a specific frequency. This can add substantial mass to the structure which can be undesirable in certain situations.Our research within structural damping aims at minimizing these caveats through new designs and active control by distributing the vibration suppression throughout the structure.

Frequently we employ 3d printed metastructures, a structure where unique combinations of material geometries and properties, are integrated into a host structure on a centimeter to micrometer scale to achieve a specific dynamic response. We focus on achieving this through variable stiffness mass-spring oscillators, actively controlled oscillators using smart materials, and structural mass-spring optimizations in many instances with no additional mass. This includes analyzing the response of the structure in extreme environments such as high temperature and pressure.

Energy Harvesting

While vibrations can frequently be undesirable, engineers can also put them to good use by harvesting kinetic energy. This can be beneficial in many aerospace applications, as these minor structural vibrations can generate enough power for a low-powered on-board sensor. Typically, piezoelectric materials are used as harvesters which convert strain energy to electric energy. By coupling these smart materials with vibrating systems in unique manners, we can more effectively harvest vibrational energy.

Our projects within energy harvesting have focused on a wide variety of topics including piezoelectric grass and a dual harvesting-sensing aircraft spar for gust alleviation. Most recently, our research has delved into broadband energy harvesting over a range of frequencies using multi-stable harvesters. Overall, we frequently use complex geometries such as zig-zag beams, and are able to effectively condense cantilevered harvesters to achieve low-frequency harvesters.

Aircraft Morphing

The field of morphing aircraft is expanding rapidly as research into sensor networks and smart materials advance in unison. This allows for smooth complex shape changes within the aircraft while monitoring the state of the entire structure. typically, morphing is implemented for drag reduction, increased maneuverability, and adaptability but its capabilities can encompass an even wider spectrum. Using smart materials, we aim to minimize weight and reduce the complexity of morphing aircraft designs.

Thus far, our research has focused on quantifying the aerodynamic benefits of morphing with respect to aircraft adaptation to a multitude of different off-design conditions through both aeroelastic simulations and experiments. This includes optimizing the spanwise configurations for both linear and nonlinear aerodynamics and testing the configurations in the 5’ x 7’ wind tunnel at the university of michigan. recently, we have developed novel methods of integrating multiple smart materials into wing structures to augment tip deflections, actuate over multiple time scales, and achieve complex camber variation. motivated by avian studies and in concert with several other universities we are currently investigating new morphing shapes to improve efficiency of unmanned aircraft.


Current Members 


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Past Members:

  • Alex Pankonien, University of Michigan, 2014, Avian Inspired Morphing

  • Cassio Faria, Virginia Tech, 2013, Hybrid Multifunctional Composites

  •  Ya Wang, Virginia Tech, 2012, Multifunctional Composites

  • Amin Karami, Virginia Tech, 2011, Energy Harvesting

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Publications

2017

  • L.L. Gamble and D.J. Inman, "Why morphology matters in birds and UAV's: How scale affects attitude wind sensitivity", Applied Physics Letters, 20, 2017. DOI: https://doi.org/10.1063/1.4997790

  • K. K. Reichl and D. J. Inman, “Lumped mass model of a 1D metastructure for vibration suppresion with no additional mass,” J. Sound Vib., 2017, DOI:10.1016/j.jsv.2017.05.026.

  • K. K. Reichl and D. J. Inman, “Constant Mass Metastructure with Vibration Absorbers of Linearly Varying Natural Frequencies,” in 35th International Modal Analysis Conference, 2017, DOI:10.1007/978-3-319-54810-4_16.

  • L. L. Gamble, A. M. Pankonien, and D.J. Inman.  "Stall Recovery of a Morphing Wing via Extended Nonlinear Lifting-Line Theory"., prepublished may 25, 2017, DOI:http://arc.aiaa.org/doi/abs/10.2514/1.J055042

  • Rabelo, D.S., Hobeck, J.D., Inman, D.J., Finzi Neto, R.M., and Steffen Jr., V., 2017, Real-Time Structural Health Monitoring of Fatigue Crack on Aluminum Beam Using an Impedance-Based Portable Device, Journal of Intelligent Material Systems and Structures, Prepublished May 17, 2017, doi:10.1177/1045389X17705213

  • Hobeck, J.D. and Inman, D.J., 2017, Recursive Formulae and Performance Comparisons for First Mode Dynamics of Periodic Structures, Smart Materials and Structures, vol. 26, no. 5, 055028, doi:10.1088/1361-665X/aa672b

  • Essink, B.C., Owen, R.B., Inman, D.J., "Optimization of a Zigzag Shaped Energy Harvester for Wireless Sensing Applications," In Special topics in Structural Dynamics, Volume 6, DOI: 10.1007/978-3-319-53841-9_7

  • Zhou, S., Hobeck, J.D., Cao, J., and Inman, D.J., Analytical and Experimental Investigation of Flexible Longitudinal Zigzag Structures for Enhanced Multi-Directional Energy Harvesting, Smart Materials and Structures, vol. 26, no. 3, 035008, doi: 10.1088/1361-665X/26/3/035008

  • Hobeck, J. D. and Inman, D. J., Simultaneous Passive Broadband Vibration Suppression and Energy Harvesting with Metastructures, Proc. SPIE, (Portland, OR), 25-29 Mar 2017

  • Acosta, K. L., Hobeck, J. D., Owen, R. B., and Inman, D. J., 2017, Macro-Fiber Composites Under Thermal Cycles for Space Applications, Proc. SPIE, (Portland, OR), 25-29 Mar 2017

  • Rabelo, D.S., Hobeck, J.D., Inman, D.J., Finzi Neto, R.M., and Steffen Jr., V., 2017, Monitoring of Fatigue Crack Growth Using a Low-Cost Data Acquisition Device for Impedance-Based SHM Considering Dynamic Measurements,XVII International Symposium on Dynamic Problems of Mechanics (DINAME 2017), ABCM, São Sebastião, SP, Brazil, 5-10 Mar., 2017.

  •  Moosavian, A., Sun, C. Z., Xi, F., and Inman, D. J., “Dimensional Synthesis of a Multi-loop Linkage with Single Input Using Parameterized Curves,” ASME Journal of Mechanisms and Robotics (in press). 

  • Gamble, L. L., Moosavian, A., & Inman, D. J. (2017). Effects of Speed on Coupled Sweep and Camber in Morphing Wings. In 55th AIAA Aerospace Sciences Meeting, SciTech forum, (p. 0267).

  • LEE, ANDREW J., AMIN MOOSAVIAN, AND DANIEL J. INMAN. A PIEZOELECTRICALLY GENERATED BISTABLE LAMINATE FOR MORPHING. MATERIALS LETTERS 190 (2017): 123-126.

2016

  • K. K. Reichl and D. J. Inman, “Dynamic Modulus Properties of Objet Connex 3D Printer Digital Materials,” in 34thInternational Modal Analysis Conference, 2016, DOI:10.1007/978-3-319-30249-2_15.

  • K. K. Reichl and D. J. Inman, “Metastructures and Active Vibration Control,” in 27th International Conference on Adaptive Structures Technologies, 2016

  • Moosavian, A., Sun, C. Z., Xi, F., and Inman, D. J., “A Single Input-Multiple Output Curve Adaptive Linkage Array,” Proceedings of the 40th ASME Mechanisms and Robotics Conference, Charlotte, North Carolina, 2016.

  • Lee, A. J., Moosavian, A., and Inman, D. J., “An Investigation into Piezoelectrically Induced Bistability,” Proceedings of the 27th International Conference on Adaptive Structures and Technologies, Lake George, New York, 2016.

  • GAMBLE, LAWREN L., AND DANIEL J. INMAN. Aerodynamic Performance of a Bioinspired Morphing Tailless Aircraft Concept, 27TH INTERNATIONAL CONFERENCE ON ADAPTIVE STRUCTURES AND TECHNOLOGIES. 2016

  • Moosavian, A., Gamble, L. L., Pankonien, A. M., & Inman, D. J. (2016, September). Bio-Inspired Coupling of Camber and Sweep in Morphing Wings. In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers.

  • Hobeck, J. D., Owen, R.B., and Inman, D. J., 2016, Impedance Drift due to Thermal Cycling of Macro Fiber Composites, Proc. of the 24th International Congress of Theoretical and Applied Mechanics, (Montreal, Canada), 21-26 Aug 2016

  • Hobeck, J. D. and Inman, D. J., 2016, Metastructures for Vibration Suppression, Proc. of the 24th International Congress of Theoretical and Applied Mechanics, (Montreal, Canada), 21-26 Aug 2016

  • Essink, B.C., Owen, R.B., Inman, D.J., "Wireless Broadband Magnetoelastic Energy Harvesting Module," Proceedings of the 27th International Conference on Adaptive Structures and Technologies, 2016.

  • Santos, A. A., Hobeck, J.D., and Inman, D.J., 2016, Analytical Modeling of Orthogonal Spiral Structures, Smart Materials and Structures (in press)

  • GAMBLE, L. L., & INMAN, D. J.,  yAW CONTROL OF A SMART MORPHING TAILLESS AIRCRAFT CONCEPTPROC. OF THE 6TH international conference OF Smart and Multifunctional Materials, Structures and Systems, (perugia, italy), jun 2016. DOI: 10.4028/www.scientific.net/AST.101.127

  • Essink, B. C., & Inman, D. J. (2016). Optimized 3D Printed Chiral Lattice for Broadband Vibration Suppression. In Topics in Modal Analysis & Testing, Volume 10 (pp. 199-203). Springer International Publishing.

  • Hobeck, J. D., Owen, R. B., and Inman, D. J., "Residual thermal effects in macro fiber composite actuators exposed to persistent temperature cycling", Applied Physics Letters. 2016

  • Hobeck, J. D., and D. J. Inman. "Dual cantilever flutter: Experimentally validated lumped parameter modeling and numerical characterization." Journal of Fluids and Structures 6.1 2016: 324-338

  • Essink, B.C., Inman, D.J., "A Comparison of Damping and Vibration in Metastructures," Proceedings of the ISMA 2016 Conference on Noise and Vibration Engineering.

  • Reichl, Katherine K., and Daniel J. Inman. "Finite Element Modeling of Longitudinal Metastructures for Passive Vibration Suppression." 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. 2016

  •  Pankonien, Alexander M., Gamble, Lawren L., Et al.  "Synergistic Smart Morphing AIleron: Capabilites Identification." 24th AIAA/AHS Adaptive Structures Conference, AIAA SciTech. 2016

  2015

  •  Zhou, Shengxi, Daniel J. Inman, and Junyi Cao. "A Linear-Element Coupled Nonlinear Energy Harvesting System." ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015

  • Hobeck, J. D., and D. J. Inman. “The Jd number: An empirical constant for predicting dual cantilever flutter velocity.” Applied Physics Letters 106.24 (2015): 244103

  • Gamble, Lawren L., PANKONIEN, ALEXANDER M., AND DANIEL J. INMAN. “Stall Recovery of the Span-wise Morphing Trailing Edge Concept via an Optimized Nonlinear Model.” 26TH INTERNATIONAL CONFERENCE ON ADAPTIVE STRUCTURES AND TECHNOLOGIES. 2015

  • Pankonien, Alexander M., and Daniel J. Inman. “Spanwise morphing trailing edge on a finite wing.” SPIE Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring. International Society for Optics and Photonics, 2015

  • Hobeck, Jared D., Charles MV Laurent, and Daniel J. Inman. “3D PRINTING OF METASTRUCTURES FOR PASSIVE BROADBAND VIBRATION SUPPRESSION.” International Conference on Composite Materials, 2015

  • Reichl, K. K., and Inman, D. J., “Modelling of low-frequency broadband vibration mitigation for a bar experiencing longitudinal vibrations using distributed vibration absorbers,” 20th International Conference on Composite Materials, Copenhagen, Denmark: 2015

  • Hobeck, J.D.; Inman, D.J., “Low-Cost Pressure Probe Sensor for Predicting Turbulence-Induced Vibration From Invasive Low-Velocity Turbulent Flow Measurements,” in Sensors Journal, IEEE , vol.15, no.8, pp.4373-4379, Aug. 2015

  • Hobeck, Jared D., and Daniel J. Inman. “Magnetoelastic metastructures for passive broadband vibration suppression.” SPIE Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring. International Society for Optics and Photonics, 2015

  • Essink, Brittany C.,Jared D. Hobeck, Robert B. Owen, and Daniel J. Inman. “Magnetoelastic energy harvester for structural health monitoring applications.” SPIE Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring. International Society for Optics and Photonics, 2015

  • Zhou, Shengxi, et al. “Impact-induced high-energy orbits of nonlinear energy harvesters.” Applied Physics Letters 106.9 (2015): 093901.</li>

  • Hobeck, J. D., and Inman, D. J., "Energy Harvesting from Dual Cantilever Flutter", Proc. of the 10th International Symposium on Vibrations of Continuous Systems, Stanley Hotel, (Estes Park, Colorado), 2015

  2014

  • Zhou, Shengxi, et al. “Broadband tristable energy harvester: Modeling and experiment verification.” Applied Energy 133 (2014): 33-39

  • Hobeck, J. D., and D. J. Inman. “A distributed parameter electromechanical and statistical model for energy harvesting from turbulence-induced vibration.”Smart Materials and Structures 23.11 (2014): 115003

  • Cao, Junyi, Shengxi Zhou, and Daniel J. Inman. “Nonlinear Characteristics for Rotatable Magnetically Coupling Piezoelectric Energy Harvesters.” ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014.

  • Pankonien, Alexander M., Cassio T. Faria, and Daniel J. Inman. “Synergistic smart morphing aileron: Experimental quasi-static performance characterization.” Journal of Intelligent Material Systems and Structures (2014): 1045389X14538530

  • Hobeck, Jared D., Damien Geslain, and Daniel J. Inman. “The dual cantilever flutter phenomenon: A novel energy harvesting method.” SPIE Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring. International Society for Optics and Photonics, 2014

  • Faria, Cassio T., and Daniel J. Inman. “Modeling energy transport in a cantilevered Euler–Bernoulli beam actively vibrating in Newtonian fluid.”Mechanical Systems and Signal Processing 45.2 (2014): 317-329

  • Pankonien, Alexander M., and Daniel J. Inman. “Aeroelastic performance evaluation of a flexure box morphing airfoil concept.” SPIE Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring. International Society for Optics and Photonics, 2014

  • Faria, Cassio T., Robert B. Owen, and Daniel J. Inman. “Micro-fiber composites performance under thermal cycling for impedance-based SHM applications.”SPIE Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring. International Society for Optics and Photonics, 2014

  • Lee, Andrew J., Ya Wang, and Daniel J. Inman. “Energy harvesting of piezoelectric stack actuator from a shock event.” Journal of Vibration and Acoustics 136.1 (2014): 011016

  • Pankonien, Alexander M., and Daniel J. Inman. “Aerodynamic Performance of a Spanwise Morphing Trailing Edge Concept.” 25th International Conference on Adaptive Structures and Technologies. 2014

  • Pankonien, Alexander M., et al. “Synergistic smart morphing aileron: Aero-structural performance analysis.”22nd AIAA/ASME/AHS Adaptive Structures Conference. 2014