D. Sathianarayanan

Bio: D. Sathianarayanan is an academic researcher from National Institute of Ocean Technology. The author has contributed to research in topics: Remotely operated vehicle & Hull. The author has an hindex of 8, co-authored 29 publications receiving 241 citations. Previous affiliations of D. Sathianarayanan include Anna University.

Chatter Suppression in Boring Operation Using Magnetorheological Fluid Damper

Abstract: This present study discusses about improvement of damping capability of boring tools and suppression of chatter using Magnetorheological (MR) damper. For the design and optimization of MR fluid damper volume constrained optimization methodology using ANSYS magnetic finite element routines were executed. Optimized design of MR damper was fabricated and its effect in boring operation has been investigated using an experimental setup. Experimental results were analyzed with the help of Auto-Regressive (ARX) models. Results show that MR damper application reduces the possibility of chatter and improves the stability of boring operation.

Design and development of Remotely Operated Vehicle for shallow waters and polar research

Abstract: This paper details the design, development and qualification of a 500 m depth rated Remotely Operable Vehicle PROVe 500, intended for carrying out scientific research in shallow waters and in challenging Polar Regions. The vehicle with dimensions of 0.96 m × 0.61 m × 0.63 m and weighing 175 kg in air, is designed for a speed of 3 knots at an electric power input of 5 kW. The vehicle which is powered by 300 V DC through the 500 m length of a neutrally buoyant electro-optic umbilical communicates with the surface console through the redundant fiber optic cores of the umbilical. A real time controller on board the vehicle controls the vehicle's functions based on the commands from the surface console. The vehicle piloting is done using illuminated cameras, and the support of the navigation system realized using an in-house developed navigation algorithm, with a tuned Kalman filter with inputs from the attitude sensor and acoustic Doppler Velocity Log. The developed vehicle is tested for its hydrodynamic stability, low temperature performance in the in-house test facilities and for navigation at the Idukki Lake in Kerala, where the vehicle is navigated at a depth of 106 m at 2 knots speed with the navigation system's position error of less than 5 % in the dead reckoning mode. The vehicle is being equipped with accessories for carrying out research in Polar Regions.

Chatter in machining processes: A review

Abstract: Chatter is a self-excited vibration that can occur during machining operations and become a common limitation to productivity and part quality. For this reason, it has been a topic of industrial and academic interest in the manufacturing sector for many years. A great deal of research has been carried out since the late 1950s to solve the chatter problem. Researchers have studied how to detect, identify, avoid, prevent, reduce, control, or suppress chatter. This paper reviews the state of research on the chatter problem and classifies the existing methods developed to ensure stable cutting into those that use the lobbing effect, out-of-process or in-process, and those that, passively or actively, modify the system behaviour.

Guidance And Control Of Ocean Vehicles

Abstract: By searching the title, publisher, or authors of guide you in reality want, you can discover them rapidly. In the house, workplace, or perhaps in your method can be all best place within net connections. If you objective to download and install the guidance and control of ocean vehicles, it is utterly easy then, past currently we extend the colleague to buy and make bargains to download and install guidance and control of ocean vehicles therefore simple!

Magnetorheological fluid dampers: A review on structure design and analysis

Abstract: Magnetorheological fluid technology has gained significant development during the past decades. The application of magnetorheological fluids has grown rapidly in civil engineering, safety engineering, transportation, and life science with the development of magnetorheological fluid–based devices, especially magnetorheological fluid dampers. The magnetorheological fluid dampers could offer an outstanding capability in semiactive vibration control due to excellent dynamical features such as fast response, environmentally robust characteristics, large force capacity, low power consumption, and simple interfaces between electronic input and mechanical output. To address the fast growing demand on magnetorheological fluid damping technology in extensive engineering practices, the state-of-the-art development is presented in this article, which provides a comprehensive review on the structure design and its analysis of magnetorheological fluid dampers (or systems). This can be regarded as a useful complement to...

The second offshore production of methane hydrate in the Nankai Trough and gas production behavior from a heterogeneous methane hydrate reservoir

Abstract: Following the first attempt at producing gas from a naturally occurring methane hydrate (MH) deposit in the Daini–Atsumi Knoll in the eastern Nankai Trough area off Honshu Island, Japan in 2013, a second attempt was made in April to June of 2017 at a nearby location using two producer wells sequentially and applying the depressurization method. The operation in the first borehole (AT1-P3) continued for 12 days with a stable drawdown of around 7.5 MPa and 41 000 m3 of methane gas being produced despite intermittent sand-production events. The operation of the other borehole (AT1-P2) followed, with a total of 24 days of flow and 222 500 m3 of methane gas being produced without sand problems. However, the degree of drawdown was limited to 5 MPa because of a higher water production rate than expected in the second hole. The pressure and temperature sensors deployed in the two producers, along with the two monitoring holes drilled nearby, gathered reservoir response data and information about the long-term MH dissociation processes in the vicinity of the production holes in the temporal and spatial domains. Although the ratio of energy return to the input was considerably larger than that for the depressurization operation, some observations (e.g., the high contrast in the production rates between the two holes and the almost constant or slightly reduced gas production rates) were not predicted by the numerical models. This failure in prediction raises questions about the veracity of the reservoir characteristics modeled in the numerical simulations. This paper presents the operation summaries and data obtained with thought-experiment based-anticipated production behaviors and preliminary analysis of the obtained data as the comparison with expected behaviors. Detailed observations of gas and water production, as well as the pressure and temperature data recorded during the gas flow tests, indicate that the heterogeneous MH distribution within the reservoir was mainly responsible for the discrepancies observed between the anticipated and actual behaviors. Furthermore, the motion of the water that does not originate from MH dissociation introduces complexity, such as the occurrence of concentrated water-producing intervals and unexpected gas production responses to decreases in pressure, into the production behavior. The influence of heterogeneity should be clearly understood for the accurate prediction of gas production behavior based on MH reservoirs.

Inspection-Class Remotely Operated Vehicles—A Review

Abstract: This paper presents a review of inspection-class Remotely Operated Vehicles (ROVs). The review divides the classification of inspection-class ROVs; categorising the vehicles in order of size and capability. A state of the art technology review is undertaken, discussing various common subsystems of the ROV. Standard and novel ROV shapes and designs are reviewed, with emphasis on buoyancy, frame materials and hydrodynamics. Several power considerations and designs are discussed, accounting for battery fed and mains fed systems. ROV telemetry is split into a discussion on the various transmission hardware systems and the communication protocols that are most widely used in industry and research today. A range of thruster technologies is then introduced with consideration taken of the various thruster architectures available. Finally, the navigation and positioning sensors employed for ROV navigation and control are reviewed. The author has also created a number of comparison tables throughout the review; tables include comparison of wired data transmission technology, comparison of common ROV communication protocols and comparisons of various inertial navigation systems. By the end of the review the reader will have clearer understanding on the fundamentals of inspection-class ROV technologies and can use this as an introduction to further paper investigation.