Andy Ruina: Publications

Publications

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  • Bhounsule, P. A., J. Cortell, A. Ruina. 2014. "Design and control of ranger: an energy-efficient, dynamic walking robot." Journal of Robotics Research.
  • Pratap, R., A. Ruina. 2014. Introduction to Statics and Dynamics. : 1049. In draft form.
  • Lothman, P., A. Ruina. 2012. "Humans can run on water using big instantly-changeable shoes." In prep.
  • Grewal, A., P. Johnson, A. Ruina. 2011. "A chain that speeds up, rather than slows, due to collisions: How compression can cause tension." American Journal of Physics 79 (7): 723-729.
  • Gomes, M., A. Ruina. 2011. "A Walking Model with No Energy Cost." Physical Review E 83 (3): 032901-1 -- 032901-4.
  • A. Ruina, P. Bhousule. 2014. "Discrete-Decision Continuous-Actuation control: balance of an inverted pendulum and pumping a pendulum swing." JOURNAL of Dynamic Systems, Measurement, and Control.
  • Karssen, JGD, C. Paul, A. Ruina. 2014. "Low-bandwidth reflex-based control for lower power walking: 65 km on a single battery charge." Journal of Robotics.
  • Graham, C., A. Grewal, C. Parruci, A. Ruina. 2014. "The bricycle: a bicycle in zero gravity can be balanced or steered but not both." Vehicle System.
  • Bhounsule, P. A., J. Cortell, A. Ruina. 2013. "Design and control of ranger: an energy-efficient, dynamic walking robot." Journal of Robotics Research.
  • Srinivasan, M., A. Ruina. 2008. "Rocking and rolling: A can that appears to rock might actually roll." Physical Review E 78 (6): 066609-1 -- 066609-9.
  • Srinivasan, M., A. Ruina. 2007. "Idealized walking and running gaits minimize work." Proceedings of the Royal Society a-Mathematical Physical and Engineering Sciences 463 (2086): 2429-2446.
  • Meijaard, J. P., J. M. Papadopoulos, A. Ruina, A. L. Schwab. 2007. "Linearized dynamics equations for the balance and steer of a bicycle: a benchmark and review." Proceedings of the Royal Society a-Mathematical Physical and Engineering Sciences 463 (2084):1955-1982.
  • Cabrera, D., A. Ruina, V. Kleshnev. 2006. "A simple 1(+) dimensional model of rowing mimics observed forces and motions." Human Movement Science 25 (2): 192-220.
  • Srinivasan, M., A. Ruina. 2006. "Computer optimization of a minimal biped model discovers walking and running." Nature 439 (7072):72-75.
  • Gomes, M. W., A. Ruina. 2005. "A five-link 2D brachiating ape model with life-like zero-energy-cost motions." Journal of theoretical biology 237 (3): 265-278.
  • Ruina, A., J. E. A. Bertram, M. Srinivasan. 2005. "A collisional model of the energetic cost of support work qualitatively explains leg sequencing in walking and galloping, pseudo-elastic leg behavior in running and the walk-to-run transition." Journal of theoretical biology 237 (2): 170-192.
  • Bertram, J. E. A., A. Ruina. 2005. "Galloping: The long and the short of a mechanically ambiguous gait." Comparative Biochemistry and Physiology a-Molecular & Integrative Physiology 141 (3): S147-S147.
  • Kuo, A. D., J. M. Donelan, A. Ruina. 2005. "Energetic consequences of walking like an inverted pendulum: Step-to-step transitions." Exercise and Sport Sciences Reviews 33 (2): 88-97.
  • Collins, S., A. Ruina, R. Tedrake, M. Wisse. 2005. "Efficient bipedal robots based on passive-dynamic walkers." Science 307 (5712):1082-1085.
  • Chatterjee, A., R. Pratap, C. K. Reddy, A. Ruina. 2002. "Persistent passive hopping and juggling is possible even with plastic collisions." International Journal of Robotics Research 21 (7): 621-634.
  • Coleman, M. J., M. Garcia, K. Mombaur, A. Ruina. 2001. "Prediction of stable walking for a toy that cannot stand." Physical Review E6402 (2).
  • Collins, S. H., M. Wisse, A. Ruina. 2001. "A three-dimensional passive-dynamic walking robot with two legs and knees." International Journal of Robotics Research 20 (7): 607-615.
  • Bertram, J. E. A., A. Ruina. 2001. "Multiple walking speed-frequency relations are predicted by constrained optimization." Journal of theoretical biology 209 (4): 445-453.
  • Bertram, J. E. A., A. Ruina, D. E. Cox, C. S. Katsanos. 2000. "Speed, step length and frequency in human walking: evaluating the optimization criteria." American Zoologist 40 (6): 943-943.
  • Garcia, M., A. Chatterjee, A. Ruina. 2000. "Efficiency, speed, and scaling of two-dimensional passive-dynamic walking." Dynamics and Stability of Systems 15 (2): 75-99.
  • Bertram, J. E. A., A. Ruina, C. E. Cannon, Y. H. Chang, M. J. Coleman. 1999. "A point-mass model of gibbon locomotion." Journal of Experimental Biology 202 (19): 2609-2617.
  • Calsamiglia, J., S. W. Kennedy, A. Chatterjee, A. Ruina, James Thomas Jenkins. 1999. "Anomalous frictional behavior in collisions of thin disks." Journal of Applied Mechanics-Transactions of the Asme 66 (1): 146-152.
  • Chatterjee, A., A. Ruina. 1998. "A new algebraic rigid-body collision law based on impulse space considerations." Journal of Applied Mechanics-Transactions of the ASME 65 (4): 939-951.
  • Chatterjee, A., A. Ruina. 1998. "Two interpretations of rigidity in rigid-body collisions." Journal of Applied Mechanics-Transactions of the ASME 65 (4): 894-900.
  • Ruina, A. 1998. "Nonholonomic stability aspects of piecewise holonomic systems." Reports on Mathematical Physics 42 (1-2): 91-100.
  • Coleman, M. J., A. Ruina. 1998. "An uncontrolled walking toy that cannot stand still." Physical review letters 80 (16): 3658-3661.
  • Garcia, M., A. Chatterjee, A. Ruina, M. Coleman. 1998. "The simplest walking model: Stability, complexity, and scaling." Journal of Biomechanical Engineering-Transactions of the ASME 120 (2): 281-288.
  • Chang, Y. H., J. E. A. Bertram, A. Ruina. 1997. "A dynamic force and moment analysis system for brachiation." Journal of Experimental Biology 200 (23): 3013-3020.
  • Sha, Y., C. Y. Hui, A. Ruina, E. J. Kramer. 1997. "Detailed simulation of craze fibril failure at a crack tip in a glassy polymer." Acta Materialia 45 (9): 3555-3563.
  • Coleman, M. J., A. Chatterjee, A. Ruina. 1997. "Motions of a rimless spoked wheel: A simple three-dimensional system with impacts." Dynamics and Stability of Systems 12 (3): 139-159.
  • Chatterjee, A., A. Ruina. 1997. "A critical study of the applicability of rigid-body collision theory." Journal of Applied Mechanics-Transactions of the ASME 64 (1): 247-248.
  • Kogan, L., C. Y. Hui, A. Ruina. 1996. "Theory of chain pull-out and stability of weak polymer interfaces .1." Macromolecules 29 (11):4090-4100.
  • Kogan, L., C. Y. Hui, A. Ruina. 1996. "Theory of chain pull-out and stability of weak polymer interfaces .2." Macromolecules 29 (11):4101-4106.
  • Sha, Y., C. Y. Hui, A. Ruina, E. J. Kramer. 1995. "Continuum and Discrete Modeling of Craze Failure at a Crack-Tip in a Glassy Polymer." Macromolecules 28 (7): 2450-2459.
  • Hui, C. Y., A. Ruina. 1995. "Why K - High-Order Singularities and Small-Scale Yielding." International Journal of Fracture 72 (2): 97-120.
  • Domokos, G., J. Papadopulos, A. Ruina. 1994. "Static Equilibria of Planar, Rigid Bodies - Is There Anything New." Journal of Elasticity 36(1): 59-66.
  • Lakes, R., P. Rosakis, A. Ruina. 1993. "Microbuckling Instability in Elastomeric Cellular Solids." Journal of Materials Science 28 (17):4667-4672.
  • Domokos, G., A. Ruina. 1993. "A Circle Construction Based on Elastostatics and Hydrodynamics." Mechanics Research Communications 20 (3): 181-185.
  • Hui, C. Y., A. Ruina, C. Creton, E. J. Kramer. 1992. "Micromechanics of Crack-Growth into a Craze in a Polymer Glass." Macromolecules25 (15): 3948-3955.
  • Goyal, S., A. Ruina, J. Papadopoulos. 1991. "Planar Sliding with Dry Friction .1. Limit Surface and Moment Function." Wear 143 (2): 307-330.
  • Goyal, S., A. Ruina, J. Papadopoulos. 1991. "Planar Sliding with Dry Friction .2. Dynamics of Motion." Wear 143 (2): 331-352.
  • Gao, Q., R. E. Pitt, A. Ruina. 1990. "A Mechanics Model of the Compression of Cells with Finite Initial Contact Area." Biorheology 27 (2):225-240.
  • Ruina, A. 1989. "Feynman - Wobbles, Bottles and Ripples." Physics today 42 (11): 127-129.
  • Horowitz, F. G., A. Ruina. 1989. "Slip Patterns in a Spatially Homogeneous Fault Model." Journal of Geophysical Research-Solid Earth and Planets 94 (B8): 10279-10298.
  • Hui, C. Y., A. Ruina. 1987. "The Viscoplastic Approximation to Hart Constitutive Law for Inelastic Deformation." International Journal of Solids and Structures 23 (6): 693-709.
  • A. Ruina. 1986. "Unsteady Motions between Sliding Surfaces." Wear 113 (1): 83-86.
  • Gao, Q., R. E. Pitt, A. Ruina. 1986. "A Model to Predict Soil Forces on the Plow Moldboard." Journal of Agricultural Engineering Research 35 (3): 141-155.
  • Gates, R. S., R. E. Pitt, A. Ruina, J. R. Cooke. 1986. "Cell-Wall Elastic Constitutive Laws and Stress-Strain Behavior of Plant Vegetative Tissue." Biorheology 23 (5): 453-466.
  • A. Ruina. 1985. "Constitutive Relations for Frictional Slip." In Mechanics of Geomaterials, edited by Z. Basant, 169-187. London: John Wiley and Sons.
  • Hui, C. Y., A. Ruina. 1985. "Eddy-Current Flow near Cracks in Thin Plates." Journal of Applied Mechanics-Transactions of the ASME 52(4): 841-846.
  • Gu, J. C., J. R. Rice, A. Ruina, S. T. Tse. 1984. "Slip Motion and Stability of a Single Degree of Freedom Elastic System with Rate and State Dependent Friction." Journal of the Mechanics and Physics of Solids 32 (3): 167-196.
  • Raz, B., G. Steinberg, A. Ruina. 1983. "A Quantitative Model of Technology-Transfer and Technological Catch-up - the Case of Developed-Countries." Technological Forecasting and Social Change 24 (1): 31-44.
  • Ruina, A. 1983. "Slip Instability and State Variable Friction Laws." Journal of Geophysical Research 88 (Nb12): 359-370.
  • Rice, J. R., A. Ruina. 1983. "Stability of Steady Frictional Slipping." Journal of Applied Mechanics-Transactions of the ASME 50 (2): 343-349.