The Underwater Acoustics Research Program was initiated in The research has been carried out in a series of Undergraduate Final year projects.

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1 Underwater Acoustics Research at DEIE Resource Person: Dr ND Jayasundere, Senior Lecturer The Underwater Acoustics Research Program was initiated in The research has been carried out in a series of Undergraduate Final year projects. Project 1: 2013 Underwater Remotely Operated Vehicle M.P. Chandimal, H.P.A. Chandrasiri, T.P.C. Madusha, P.G.G.N. Wickramasinghe Supervised by Dr. N.D. Jayasundere Underwater Remotely Operated Vehicles (ROVs) are remote control robots controlled by an operator on the surface. These robots are tethered by a series of wires that send signals between the operator and the ROV. The development of the underwater ROVs in Sri Lanka remains a challenge. The purpose of this project is to design an ROV which has balanced and smooth movements when submerged. The case for ROV technology is quite simple. There is no other practical, safe, and economically feasible way to perform deep underwater work or underwater intervention.underwater ROVs are useful because they can accomplish tasks that are dangerous, uncomfortable, or tedious for humans to perform. Some laborious tasks, such as research in commercial, military, and scientific fields in the sea for surveying and collecting visual acoustic images, can be accomplished by ROVs. By removing the human presence, and giving the vehicles a degree of autonomy, the effectiveness of the ROVs can be greatly increased. One measure of advantage is cost effectiveness. As far as we are aware there is no such underwater ROVs developed in Sri Lanka. In our project we study the design and development of an ROV.The developed ROV performs well balanced and smoothly to more than 10m depth and visualizes the undersea environment. The total cost of the ROV is about Rs This is a low cost design compare to other available ROV. Honors& Awards: S.D. Jayasundere Memorial Gold Medal May 2014 S.D. Jayasundere Memorial Gold Medal which is awarded annually for the best student in the best final year undergraduate project 2014 awarded for Mr H.P.A Chandrasiri. Page 1 of 8

2 Best Paper Award-Winner, IET Present Around the World 2014-Sri Lanka,June 2014 Best Paper Award-Winner, IET Present around the World 2014-Sri Lanka is awarded for the paper entitled "Underwater Remotely Operated Vehicle". Presented in IET Present Around the World 2014-South Asia Conference,September 2014 Page 2 of 8

3 Project 2: 2015 Fuzzy Logic Motion Control for ROV S.D.S. Lakmal, R.M.T. Lakmali, P.M.Saranguhewa Supervised by Dr. N.D. Jayasundere, Dr. S.H.K.K. Gunawickrama In this project several modifications to the developed ROV in Project 1 was done. The controlling commands and the video streaming in the developed ROV in Project 1 were done with a Raspberry pi. Video streaming was done with a Raspberry pi compatible video camera. When streaming video the data load tended to slow down the speed at which the control command signals were received by the ROV motors. A new video camera was introduced to the ROV to video independent of the control commands for the ROV. We also introduce Fuzzy Logic Motion Control to the ROV for operation in turbulent underwater environments. The attached promotion video shows the smooth motion of the ROV. Publications: Best Technical Paper 1 st Runner up Award-Winner, IET Present Around the World 2014-Sri Lanka,June 2016 Jayasundere N.D., Gunawickrama S.H.K.K., Underwater ROV with Fuzzy Logic Motion Control, 2016 IEEE Conference on Information and Automation for Sustainability (ICIAfS), December 2016, Electronic ISSN: , INSPEC Accession Number: DOI: /ICIAFS Page 3 of 8

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5 Project 3: 2015 Developing and Underwater Communication Channel A.T.N. Ahamed, I. Jayawickrama, A.D.B. Madushani Supervised by Dr. N.D. Jayasundere The developed ROV communication control system signals are transmitted via a tether from above the water surface. As the first stage in making the ROV communication system wireless this project investigated a digital underwater communication link and a suitable protocol for data transmission. This was successfully achieved for transmitting ASCII characters, but the data rate for transmission was low, about 8 Hz. Publications: I. Jayawickrama, A.T.N. Ahamed, A.D.B. Madushani,N.D.Jayasundere Wireless Digital Data Transmission through Water, IET Present Around the World 2016-Sri Lanka, June 2016 Proceedings, pp Page 5 of 8

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8 Project 4: 2016 Underwater Communication Channel - Phase II L.C.Dissanayake, W.A.C.D.Hemantha, M.G.M.Dilrukshi Supervised by Dr. N.D. Jayasundere In this project we investigated the reasons for the low speed in the developed Underwater Communication Channel. The developed communication protocol was realised by using an Arduino communication board on the receiver side to perform the demodulation. We found that the limitations imposed by the Arduino as the main reason for the low 8 Hz transmission speed. By changing the receiving electronics to function with comparators and removing the Arduino board transmission speeds of up to about 200 Hz was achieved. Project 5: 2017 Wireless Underwater Communication Link for ROV Motor Control P.S.D.N. Wijesekara, W.M.A.K.Sangeeth, H.S.C.Perera Supervised by Dr. N.D. Jayasundere The main objective in this project is to investigate ways of increasing the transmission data rate over a wireless link for communication with the ROV. Faster communication would make the operation of the ROV comparable to that of a wired communication link. The commands issued for ROV motor control are ASCII character strings and our aim is wireless transmission of these ASCII strings as control commands for ROV motor control. Our investigations has led to a complete overhall of the transmitting and receiving electronics of the underwater communication channel and work in progress indicate that data rates of upto about 1.2 KHz may be possible, which is a significant improvement from our earlier developments. Page 8 of 8