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1-4 of 4
Arun R. Srinivasa
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Proceedings Papers
Proc. ASME. IDETC-CIE2001, Volume 6C: 18th Biennial Conference on Mechanical Vibration and Noise, 3143-3151, September 9–12, 2001
Paper No: DETC2001/VIB-21753
Abstract
The motivation for this work has been a variety of motions like navigation of pipelines, insertion operations in assembly, and gripping actions, which require the adaptation of the mechanism to the external constraints, rather than avoid them. To this effect, efforts have been made towards building mechanisms that obtain the required degrees of freedom through deformations rather than explicit joints in them. Although the use of many joints provides the required number of degrees of freedom, it does so at the cost of making the system very bulky and complex. With the advent of new polymers, the possibility of building such mechanisms without joints, that fulfil the requirements of adaptation, have increased. Based on this approach, a Magneto Active Polymer (MAP) material has been developed in-house at the Texas A&M University, in which the actuation is performed by the conversion of electromagnetic energy into mechanical energy. The initial experimentation has proved the vast potential of the use of such a material, and a few mechanisms, like a magneto active peristaltic pump, have already been developed and tested, using this material. In this mechanism the pumping action is obtained when a moving magnetic field produces peristaltic waves in the magneto active material shaped as a tube. These waves help in pushing the fluid forward, in the tube. The advantage of this mechanism is that there is not physical contact of the actuating mechanism an the MAP tube, thereby reducing the wear. In developing the design for the peristaltic pump and other conceptual models described in this paper, ideas have been drawn from the different modes of locomotion and actuators used, in lower organisms and these have been good sources of inspiration for the work detailed in this paper.
Journal Articles
Journal:
Applied Mechanics Reviews
Article Type: Review Articles
Appl. Mech. Rev. May 2017, 69(3): 030802.
Paper No: AMR-16-1074
Published Online: June 6, 2017
Abstract
The aim of this review is to classify and provide a summary of the most widely used theories of continuum mechanics with nonlocal elastic response ranging from generalized continua to peridynamics showing, in broad outlines, the similarities and differences between them. We then show that, for elastic materials, these disparate approaches can be unified using a total energy-based methodology. While our primary focus is on elastic response, we show that a large class of local and nonlocal dissipative systems can also be unified by extending this methodology to a wide (but special) class of nonlocal dissipative continua. We hope that the paper may serve as a starting point for researchers for the development of novel nonlocal models.
Journal Articles
Journal:
Applied Mechanics Reviews
Article Type: Tutorial
Appl. Mech. Rev. January 2015, 67(1): 014801.
Paper No: AMR-14-1028
Published Online: August 25, 2014
Abstract
In this expository article, a simple concise treatment of Lagrange's prescription for constraint forces and constraint moments in the dynamics of rigid bodies is presented. The treatment is suited to both Newton–Euler and Lagrangian treatments of rigid body dynamics and is illuminated with a range of examples from classical mechanics and orthopedic biomechanics.
Proceedings Papers
Proc. ASME. SMASIS2009, Volume 1: Active Materials, Mechanics and Behavior; Modeling, Simulation and Control, 277-282, September 21–23, 2009
Paper No: SMASIS2009-1431
Abstract
Shape Memory Alloys are increasingly being used in aeronautic [1], vibration control and seismic applications [2–6]. These applications require models that faithfully represent the full thermomechanical response of SMA wires but which at the same time are simple and fast to implement. In this paper we present a model for the superelastic behavior of Shape Memory Alloys that combines a thermodynamical framework with a Preisach model. This approach allows us to easily account for both stress and strain controlled responses as well as changes in termperature in a simple and straightforward way.