Surface Synthetic Jet Actuators
Synthetic Jet Actuators (SJA) generates the jet of air via momentum transfer from high frequency oscillation in the piezoelectric diaphragm10. Acoustic waves generated in the chamber excite air entrained in the orifice and forces the formation of an oscillatory outflow near the orifice. This outflow is observed to be associated with the formation of a vortex ring that weakens with the oscillations of the air in the orifice and switches to inflow. This inflow brings air from around the shed vortex ring and is subsequently ejected outwards in successive cycles. The velocity of synthetic jet produced in a SJA is dependent on the geometry of the chamber, material properties of the oscillating diaphragm and shape of the chamber. Sundaresan and Gilmore have shown that a conical chamber for a SJA generates a higher jet velocity than SJA with cylindrical chambers and presents interesting applications in vector delivery, flow control, etc., Recent conference publications have demonstrated the results presented in the figure.
Self-sensing Magnetoelectric Surgical Tools
Magnetoelectric materials are self-sensing materials and are highly suitable for designing actuators that can be used in closed-loop. The research work focuses on developing magnetoelectric cantilever that can be used as an ablation tool in minimally invasive surgery (shown in figure below), as a damper in vibration isolation and as an adaptive mirror in optics. The magnetoelectric material is fabricated from combining a magnetostrictive material such as Galfenol and a piezoelectric material such as lead zirconate titanate (PZT). Current work is targeted towards developing the magnetoelectric cantilever into a smart ablation tool. It is common knowledge that a cantilever can be used as cutting tool in minimally surgery. But a cantilever-cutting tool riding on a catheter will have the tendency to drift due to force generated in the cutting action and hence pose danger to the patient. The novelty in this research is the addition of a second segment to the cantilevered end of the tool that will dynamically stabilize the cutting end of the tool. In order to realize the technical objective, a dynamic model for the magnetoelectric material is developed using variational principles and the principle of virtual work. A control algorithm such as linear-quadratic-regulator will be applied to the dynamic model for precise operation.
V.B. Sundaresan, J. Atulasimha, J. Clarke, 2010, US 8,602,034 B2; Awarded Date: Dec 10, 2013, Magnetoelectric Surgical Tools for Minimally Invasive Surgery.
DASH Ecosystem for Electric Vehicles
Mobile devices offer a unique opportunity for integration with daily life functions on a unified platform. In spite of market penetration, mobile devices have not made any impact on interfacing with the driving functions of an automobile. The primary challenge for this deficiency is the lack of unifying hardware/software platforms and barriers that exists between popular ecosystems. In order to address these issues, this work proposes a unifying platform that has the potential to combine internet connectivity, reconfigurable and personalized user interface and interaction with the automobile. This futuristic paradigm for automobiles is demonstrated using an Android tablet and interface hardware, where the tablet serves as the input device for primary or secondary vehicle functions and the interface hardware could be added on to existing dashboard controller. The interface hardware is based on a real-time board with multicore architecture and can serve as the bridge between the connected world and local ecosystem in an automobile. This research presents novel open source, open architecture for commanding vehicle functions from a mobile device over wired and wireless local area network (WLAN, also called as WiFi). We anticipate incorporating system level security functions, software integrity functions, various V2V, V2I, V2X constructs through a mobile device and our current implementations are centered around Google’s Android platform. Our seminal work in this field was presented in the International Conference on Connected Vehicles (Electric Vehicle symposium, session P06-4) at Las Vegas on 5th December, 2013 by Pedro Daniel Urbina Coronado (http://edas.info/p15085). Our continuing work in this area places an upgradeable software running in a mobile device as a hub for regulating various driving and miscellaneous functions in a car.
‘DASH’ Ecosystem stands for Driving Assistance Software Hardware Ecosystem and is a collection of software and hardware that will allow mobile devices to control driving and miscellaneous functions in an electric vehicle.
The first implementation of this ecosystem is based on a Parallax Propeller-based board for connecting Android devices to the in-car network and was designed by Prof. Sundaresan and Pedro Urbina Coronado (visiting scholar in Sundaresan Research Group) between Jan-2013 and Dec-2013. This work was presented as a technical presentation at the IEEE International Conference on Interconnected Vehicles & Expo (ICCVE-2013) on 5th December 2013.
This project has been discontinued since the announcement of Android Auto and Apple CarPlay in early 2014.