Lakshitha received his PhD from the University of Technology Sydney (UTS), Australia and his B.Sc. Eng. in Electronic and Telecommunication Engineering with First Class Honours from the University of Moratuwa, Sri Lanka in 2016 and 2010 respectively.
He is currently a Postdoctoral Fellow at the Centre for Autonomous Systems at UTS where he conducts research on autonomous robot localisation and mapping.
From Nov. 2014-Jul. 2015, Lakshitha was associated with Terrestrial Robotics Engineering, and Control Lab (TREC) at the Virginia Polytechnic Institute and State University (VirginiaTech) in Blacksburg, VA, USA as a Visiting Scholar to represent UTS at the US Department of Defense sponsored DARPA Robotics Challenge 2015 which was held in California on the 05-06th June 2015.
There, he worked on developing 3D state estimation and mapping algorithms for ECHER, a full-size humanoid robot designed and developed at VirginiaTech.
Autonomous robot localisation and mapping, Robot navigation, Human robot interaction, Assistive robotics
Knabe, C., Griffin, R., Burton, J., Cantor-Cooke, G., Dantanarayana, L., Day, G., Ebeling-Koning, O., Hahn, E., Hopkins, M., Neal, J., Newton, J., Nogales, C., Orekhov, V., Peterson, J., Rouleau, M., Seminatore, J., Sung, Y., Webb, J., Wittenstein, N., Ziglar, J., Leonessa, A., Lattimer, B. & Furukawa, T. 2017, 'Team VALOR's ESCHER: A Novel Electromechanical Biped for the DARPA Robotics Challenge', Journal of Field Robotics, vol. 34, no. 5, pp. 912-939.View/Download from: Publisher's site
© 2017 Wiley Periodicals, Inc. The Electric Series Compliant Humanoid for Emergency Response (ESCHER) platform represents the culmination of four years of development at Virginia Tech to produce a full-sized force-controlled humanoid robot capable of operating in unstructured environments. ESCHER's locomotion capability was demonstrated at the DARPA Robotics Challenge (DRC) Finals when it successfully navigated the 61 m loose dirt course. Team VALOR, a Track A team, developed ESCHER leveraging and improving upon bipedal humanoid technologies implemented in previous research efforts, specifically for traversing uneven terrain and sustained untethered operation. This paper presents the hardware platform, software, and control systems developed to field ESCHER at the DRC Finals. ESCHER's unique features include custom linear series elastic actuators in both single and dual actuator configurations and a whole-body control framework supporting compliant locomotion across variable and shifting terrain. A high-level software system designed using the robot operating system integrated various open-source packages and interfaced with the existing whole-body motion controller. The paper discusses a detailed analysis of challenges encountered during the competition, along with lessons learned that are critical for transitioning research contributions to a fielded robot. Empirical data collected before, during, and after the DRC Finals validate ESCHER's performance in fielded environments.
Dantanarayana, L., Dissanayake, G. & Ranasinge, R. 2016, 'C-LOG: A Chamfer distance based algorithm for localisation in occupancy grid-maps', CAAI Transactions on Intelligence Technology, vol. 1, no. 3, pp. 272-284.View/Download from: UTS OPUS or Publisher's site
Ryu, K., Dantanarayana, L., Furukawa, T. & Dissanayake, G. 2016, 'Grid-based Scan-to-Map Matching for Accurate 2D Map Building', Advanced Robotics, vol. 30, no. 7, pp. 431-448.View/Download from: UTS OPUS or Publisher's site
This paper presents a grid-based scan-to-map matching technique for accurate 2D map building. At every acquisition of a new scan, the proposed technique matches the new scan to the previous scan similarly to the conventional techniques, but further corrects the error by matching the new scan to the globally defined map. In order to achieve best scan-to-map matching at each acquisition, the map is represented as a grid map with multiple normal distributions (NDs) in each cell, which is one contribution of this paper. Additionally, the new scan is also represented by NDs, developing a novel ND-to-ND matching technique. This ND-to-ND matching technique has significant potential in the enhancement of the global matching as well as the computational efficiency. Experimental results first show that the proposed technique accumulates very small errors after consecutive matchings and identifies that the scans are matched better to the map with the multi-ND representation than one ND representation. The proposed t...
Unicomb, J., Dantanarayana, L., Arukgoda, J., Ranasinghe, R., Dissanayake, G. & Furukawa, T. 2017, 'Distance function based 6DOF localization for unmanned aerial vehicles in GPS denied environments', 2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), IEEE.View/Download from: UTS OPUS or Publisher's site
Dantanarayana, L., Dissanayake, G., Ranasinghe, R. & Furukawa, T. 2015, 'An extended Kalman filter for localisation in occupancy grid maps', 2015 IEEE 10th International Conference on Industrial and Information Systems (ICIIS), IEEE International Conference on Industrial and Information Systems, IEEE, Peradeniya, Sri Lanka, pp. 419-424.View/Download from: UTS OPUS or Publisher's site
Furukawa, T., Dantanarayana, L.I., Ziglar, J., Ranasinghe, R. & Dissanayake, G. 2015, 'Fast Global Scan Matching for High-Speed Vehicle Navigation', IEEE Xplore, IEEE International conference on Multisensor Fusion and Integration for Intelligent Systems, IEEE, San Diego, CA, USA, pp. 37-42.View/Download from: UTS OPUS or Publisher's site
Dantanarayana, L., Ranasinghe, R., Tran, A., Liu, D. & Dissanayake, G. 2014, 'A novel collaboratively designed robot to assist carers', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), International Conference on Social Robotics (ICSR), SPRINGER-VERLAG BERLIN, Sydney, Australia, pp. 105-114.View/Download from: UTS OPUS or Publisher's site
© Springer International Publishing Switzerland 2014. This paper presents a co-design process and an assisted navigation strategy that enables a novel assistive robot, Smart Hoist, to aid carers transferring non-ambulatory residents. Smart Hoist was codesigned with residents and carers at IRT Woonona residential care facility to ensure that the device can coexist in the facility, while providing assistance to carers with the primary aim of reducing lower back injuries, and improving the safety of carers and patients during transfers. The Smart Hoist is equipped with simple interfaces to capture user intention in order to provide assisted manoeuvring. Using the RGB-D sensor attached to the device, we propose a method of generating a repulsive force that can be combined with the motion controller's output to allow for intuitive manoeuvring of the Smart Hoist, while negotiating with the environment. Extensive user trials were conducted on the premises of IRTWoonona residential care facility and feedback from end users confirm its intended purpose of intuitive behaviour, improved performance and ease of use.
Ranasinghe, R., Dantanarayana, L., Tran, A., Lie, S., Behrens, M. & Liu, L. 2014, 'Smart Hoist: An Assistive Robot to Aid Carers', Proceedings for the International Conference on Control Automation Robotics & Vision, International Conference on Control, Automation, Robotics and Vision, IEEE, Singapore, pp. 1285-1291.View/Download from: UTS OPUS or Publisher's site
Assistive Robotics(AR) is a rapidly expanding field, implementing advanced intelligent machines which are able to work collaboratively with a range of human users; as assistants, tools and as companions. These AR devices can assist stretched carers at residential aged care facilities to safely enhance their capacity and to improve the quality of care services. The research work presented in this paper describes the pre- liminary outcomes of a design, development and implementation of a patient lifting AR device (Smart Hoist) to reduce lower back injuries to carers while transferring patients in aged care facilities. The proposed solution, a modified conventional lifter device which consists of several sensors capable of interacting with the Smart Hoist operator and its environment, and a set of powered wheels. This solution helps carers to manoeuvre the Smart Hoist safely and intuitively. Preliminary results collected from an evaluation of the Smart Hoist conducted at the premises of IRT Woonona residential care facility confirm the improved safety, comfort and confidence for the carers.
Dantanarayana, L.I., Ranasinghe, R. & Dissanayake, G. 2013, 'C-LOG: A Chamfer Distance Based Method for Localisation in Occupancy Grid-maps', IEEE/RSJ International Conference on Intelligent Robots and Systems 2013, IEEE/RSJ International Conference on Intelligent Robots and Systems, IEEE, Tokyo, Japan, pp. 376-381.View/Download from: UTS OPUS or Publisher's site
In this paper, the problem of localising a robot within a known two-dimensional environment is formulated as one of minimising the Chamfer Distance between the corresponding occupancy grid map and information gathered from a sensor such as a laser range finder. It is shown that this nonlinear optimisation problem can be solved efficiently and that the resulting localisation algorithm has a number of attractive characteristics when compared with the conventional particle filter based solution for robot localisation in occupancy grids. The proposed algorithm is able to perform well even when robot odometry is unavailable, insensitive to noise models and does not critically depend on any tuning parameters. Experimental results based on a number of public domain datasets as well as data collected by the authors are used to demonstrate the effectiveness of the proposed algorithm.