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Item DEVELOPMENT OF CONTROL SYSTEM FOR AN UNDERWATER ROV (REMOTELY OPERATED VEHICLE) FOR SURVEYING THE UNDERWATER PORTION OF THE SHIP HULL(2024-03) HASSAN, MD.TAMIM; ROHAN, AL SHAREAR HOSSAINUnderwater robotics is a rapidly growing field with applications in various industries such as oil and gas, marine biology, commercial activities like underwater inspection, and military etc. The hardware portion of underwater robotics is crucial for the successful operation of the robots in the harsh underwater environment. There are several types of control systems commonly used in underwater robotics such as Manual Control, Autonomous Control, Tele operation Control, Hybrid Control, Closed-Loop Control .In this project we are using manual control system includes following components: Control Station, Communication System, Sensors, Propulsion Systems, Power Management, PID control algorithm. The main aim of this thesis is to develop a cost-effective, efficient, and reliable control system for underwater robotics which would be able to maneuver the vehicle in six DOF with great ease. For this purpose we are not only focusing on controllability but also designing an efficient hull for serving our purpose and also optimized propeller using CFD technique. Motor were selected on the basis of the simulated thrust generated by propeller in ANSYS fluent software module. The methodology of underwater robotics involves a series of steps and process that are followed in a design, construction and operation. These steps typically include: requirements definition, design, prototype construction, testing and operation.Item DESIGN OF A GREEN SHIP FOR CONSERVATION OF ENVIRONMENT AT NIKLI HAOR IN BANGLADESH(2024-02) LUBA, TABASSUMA TASNIM; MIM, UMMA HONEYThe Nikli Haor, encompassing the areas of Nikli, Mithamain, Austagram, and Itna upazilas in Kishoreganj district, is an extensive wetland. It appears as if numerous small islands and breathtaking natural formations are scattered across the vast water body, resembling isolated islets in a colossal watery expanse. During the rainy season, almost all these areas in the four upazilas of Kishoreganj—Nikli, Mithamain, Austagram, and Itna—are submerged in water, gradually receding as the rainy season concludes. During this time, the raised roads constructed for communication across the haor become visible. Previously, boat communication was prevalent during the rainy season, and people traversed from one place to another on foot during dry periods. However, times have changed, and with the development of infrastructure in these upazilas, all-weather roads and semi-metal roads have been built to facilitate communication. In the dry season, these areas witness rice cultivation and extensive livestock farming. Nevertheless, at present, the excessive use of engine-driven boats for transportation and the disposal of waste materials into the water by boat passengers are causing water pollution. This pollution, along with the impact of agricultural runoff and changes in the reproductive cycle of aquatic organisms, is adversely affecting the aquatic ecosystem. This research focuses on proposing a sustainable and environmentally friendly mode of transportation for travelers in the form of an indigenous amphibious vessel. The vessel aims to address issues related to the disposal of single-use plastics into the water by promoting the use of reusable and biodegradable plastic products. Additionally, the research suggests the implementation of decentralized wastewater treatment systems, hybrid engine systems, and the utilization of solar panels to reduce carbon dioxide emissions. Efforts are made to purify solid and liquid waste through the use of bio-gas production and bio-slurry treatment tanks. The decentralized wastewater treatment system ensures the use of bacteria-free water for various purposes or can be discharged without causing harm to the environment. The use of organic waste from the vessel in the form of bio-slurry can contribute to the production of bio-gas and serve as a nutrient-rich organic fertilizer, which can be sold for agricultural purposes. The adoption of hybrid engine systems and solar panels helps in reducing carbon dioxide emissions, making the model both environmentally sustainable and economically viable. Marine hybrid electric propulsion systems combine combustion engines with battery power to reduce emissions and optimize engine operation. They are suitable for vessels with varying power demands and flexible operating profiles. The successful implementation of this model not only benefits travelers but also makes the entire transportation system environmentally friendly. With the area's soil remaining unpolluted, dry-season activities such as rice cultivation and livestock rearing can thrive, resulting in economic prosperity. This model serves as an economically viable and environmentally sustainable solution.Item DESIGN AND CONSTRUCTION OF AN ECONOMICAL UNDERWATER REMOTELY OPERATED VEHICLE (UROV) FOR SURVEYING UNDERWATER PORTION OF SHIP HULL & SHALLOW WATERWAYS(2024-03) EMON, MD. EMAM HOSSAIN; SHARIF AHAD, SHAH MD. NEWAZSurveying underwater portion of ship hull is time consuming and costly as it is difficult to access and also poses a significant risk to human divers. To mitigate the problem, we have designed and constructed an economical underwater ROV. The ROV is made of lightweight materials to minimize weight and increase buoyancy. It is powered by a lithium-ion battery pack and is controlled by a tethered connection to a surface control unit. A raspberry pi-based control system is used to process, transmit and receive all information in the ROV. Overall eight thrusters are used to control the propulsion system. The ROV is capable to accomplish various rotational and flat movements in the water and it is equipped with a high-definition camera, a lighting system, and various sensors. The robot has the ability to navigate around the hull of the ship and capture high-quality images and data in real-time. The main application of the ROV is not only to inspect the underwater portion of ship hull but also shallow waterways. The ROV was tested in a controlled environment and performed well, providing clear and accurate images of the underwater environment. The ROV is expected to be a valuable tool for surveying ship hulls and shallow waterways, providing a cost-effective and efficient solution for underwater inspections.Item OPTIMIZATION OF ELECTRICAL ENERGY FROM A SPEED BUMP(2024-02) HASAN, S.M. MEHEDI; AKASH, SHEAKH MD ABDUR RAYHANThe most basic requirement for all living things in the cosmos to survive is energy. In our rapidly changing world, where traditional energy sources are running out and population is growing daily, everything that occurs in the immediate vicinity is a manifestation of energy flow in one of its forms. In a few years, the energy crisis was brought on by the over usage of energy. As a result, in order to solve this issue, we must use methods for making the best use of conventional sources of energy saving. Due to its sustainability, renewability, and accessibility, renewable energy sources are becoming more and more popular these days. The world over, using the kinetic energy of cars going over speed bumps is one of the most cost effective and environmentally beneficial ways to generate electricity. Pollution-free energy recovery system design has grown in importance among researchers. Speed Bump Power Generator (SBPG) is one of several proposed systems that uses traffic movements on streets, boulevards, and highways to generate electricity. An SBPG system translates vertically as a vehicle passes over it. As a result, kinetic energy is created and converted into electrical power. Various SBPG system types are covered in this study. The rack-and-pinion system is the subject of an experimental examination. The results indicate that when an 20 kg mass is added to the SBPG system under consideration, electrical power up to 0.014 W is created. The results’ extrapolation indicates that different cars with varying masses can generate powers of about 106.033 kW as they go over the bumps. This feat may be utilized to charge the accumulator, which can power the traffic lights. The generator runs for 1.01 hours to charge the accumulator’s 6 Ah capacity.Item DETERMINATION OF THE CRITICAL SPEED OF SHAFT(2024-03) AL MAAYEN, ABDULLAH; PALASH, SHAMIM ALAM; JOY, SHAIKAT BARUAThis thesis gives a demonstration of critical speed of shaft. An approach of theoretical, experimental & modal analysis of a shaft with various properties is used in this body of work. A shaft is connected with motors to detect the critical speed. Centrifugal Single Phase AC motor HC84-14 is the main motor used here to rotate the shaft. This observation is done in Simply Supported Beam with a uniformly distributed load. A 25kg steel channel was used a base for this project. Mild, Stainless & Hollow Carbon Fiber shaft of various diameters & lengths was used to measure the speed. Whirling/Critical speed is a very serious factor to consider while designing any mechanical product. It is a must known for safety or to prevent disaster form happening in any situation. Ignoring the effect of critical speed will result in the bending or dislocation of shaft. Due to transverse & horizontal vibration the whirling of shaft happens. If shaft is under vibration from outside forces & the frequency of it matches with natural frequency then amplitude of the shaft reaches maximum & creates instability for any engine. By modal or Eigenvalue analysis we can see the perfect critical RPM for any types of shaft. Different types of shaft will give different result based on shape, geometry or property of the materials. The result of the experiment indicates that critical speed decreases with the increase of the shaft length. Also if we increase the diameter of shaft & keep length the same then critical speed increases. We are assessing the various mechanical conditions that take place when shaft is rotating. A particular response of a shaft while rotating can be seen from here. Stainless steel performs better than mild steel & carbon fiber shaft performs better than both of them as it has better weight to strength ratio. For the theoretical calculation we used the Dunkerley's Formula which provides a lower range on the lowest natural frequency of the system meaning detection of critical speed can be done very early by user. The prediction of critical speed can help an engineer to great extent while selecting engine of a product, to understand failure mode in dynamic condition & counter measures can be developed to minimize it.Item WINDGENERATEDWAVESINBANGLADESH RIVERSFORTHEASSESSMENTOFINLAND VESSELSSTABILITY CONDITION CONSIDERINGDURATIONLIMIT(2024-02) HOSSAIN, MDSHAKIBUL; SAIFUL ISLAM, MOHAMMADInternational regulatory body (IMO) has recently enhanced the assessment procedure of vessels’ stability condition by formulating some complementary measures. These additional measures are based on environmental condition of navigational routes and so, probabilistic. Wind generated surface wave is the main governing parameter of environ mental condition in inland river routes. Bangladesh inland navigational routes frequently suffer seasonal strong winds and consequently, surface waves generate. The severity of wave condition depends on wind velocity, duration and the distance covered by wind. This study has proposed an environmental condition with wave characteristic parameters for considering in Bangladesh inland vessel design. The sequential wind wave generations have phases of duration limited, fetch limited and fully developed.-- A previous study proposed the environmental condition of Bangladesh Rivers considering the fetch limited waves. The current study has formulated a more realistic wave condition by considering duration-limited waves. The understanding behind this modification is that the required wind blowing duration with the considered design velocity (20.83 m/s) for fetch limited waves is not very much practical.--Anumberofwaveforecasting models have been studied and compared. The models pro posed for fetch limited conditions are used for duration-limited condition by estimating the equivalent fetch. The governing equation for this estimation is the so-called space time conversion equation. Existing regulations of river sea vessels as following by other countries are studied and recommendation is made to follow the regulations for not only Bangladesh river sea vessels (coastal vessels) but also for inland river vessels.Item FENDER ANALYSIS OF SHIP USING FINITE ELEMENT METHOD(2024-02) KHAN, MD. SHARIFUL ISLAM; SUBORNA, AKTERShip fenders play a crucial role in preventing damage to both the ship and the structure it comes in contact with. In a recent study, the force acting on the fender in extreme conditions was calculated to be approximately 257 KN using numerical formulae. The study resulted in the development of a final model consisting of two individual parts: the initial side shell plate and the transverses. A rigid boundary condition was applied around the side shell to ensure stability. During the mesh generation process, the shells were considered2D due to their small thickness and were shaped in a quadrilateral form. The structural mesh for this study was considered to be more friendly using the structured meshing technique, as the side shell is a non-complex structure without any openings or holes. Three types of fenders, namely D-type, Wedge type, and V-type, were used for simulation. The results indicated that the V-type fender exhibited the lowest maximum stress, with the Von-Mises stress being the lowest among the three types. This finding is significant as it contributes to the primary purpose of the study, which is to identify a sustainable fender design. It is well-known that lower Von-Mises stress indicates a higher ability to sustain the load. Therefore, the study concluded that the V-type fender is more sustainable than the other types. The study has provided valuable insights into the design and sustainability of ship fenders. The findings will contribute to the development of more effective and durable fenders, ultimately leading to enhanced protection for ships and the structures they come in contact with.Item DEVELOP SUPPLY CHAIN MODEL FOR LNG BUNKERING FACILITIES IN BANGLADESH(2024-02) MEEM, MUMTAHINA; AKHTER, SANJIDAAs the shipping industry uses LNG fuel more often, building LNG bunkering stations at ports is becoming a new necessity for port growth. There aren't many assessments in this subject yet because port LNG bunkering stations are still a relatively new area of study. Since the maritime sector has been moving in the direction of sustainability and environmental responsibility, liquefied natural gas, or LNG is commonly regarded as a top alternative marine fuel. The availability of LNG bunkering is essential for LNG to be used as a fuel. Safe and effective operations are necessary for LNG bunkering technology to spread. In this research work, the nature of current challenges like LNG production, remote locations, and LNG storage were identified. The LNG supply chain model has been developed in light of the challenges that have been highlighted. An effective ship-to-ship LNG bunkering supply chain model is presented in this paper. LNG transfer concept use can be simplified by design optimization when using the LNG process. It takes into account the land-based transportation of LNG from the terminals to customers on or off the coast, as well as the marine delivery of LNG from supply ports. Moreover, a path has been established for potential advancements in the unique components of the LNG supply chain. This study focuses on the LNG bunkering system and inter-terminal marine transportation between a set of supply ports and a set of receiving ports that are scattered sparsely and have predetermined demands.Item THE CHALLENGE OF IMPLEMENTATION OF INDUSTRIAL REVOLUTION 4.0 IN SHIP BUILDING INDUSTRIES OF BANGLADESH(2024-03) NOOR-E-ELAHI, S.M.; AL TURABI, HANINThis abstract defines a research study focused on examining the potential impact of the fourth industrial revolution (IR 4.0) on the shipbuilding industry in Bangladesh. It begins by acknowledging the global influence of IR 4.0 on various industries, including shipbuilding, and highlights the need for Bangladesh to adapt to remain competitive in the international market. The study first conducts a thorough review of the current state of the shipbuilding industry in Bangladesh, encompassing infrastructure capacity, technological investment, manpower, and management systems. Through literature review and field surveys, the research identifies areas within the shipbuilding industry that are likely to be affected by IR 4.0. To gain deeper insights, the study employs a semi-structured and open-ended questionnaire, administered to relevant stakeholders through in-person and online interviews. The data gathered from these interviews is transcribed and analyzed thematically to discern patterns and key themes. Subsequently, a SWOT analysis is conducted to evaluate the strengths, weaknesses, opportunities, and threats associated with the adoption of IR 4.0 in the shipbuilding industry of Bangladesh. The analysis reveals potential benefits of IR 4.0 adoption but also highlights significant challenges that must be addressed before implementation. In conclusion, the abstract suggests strategies to overcome the identified challenges and advance the shipbuilding industry in Bangladesh. Overall, the research aims to provide valuable insights into the implications of IR 4.0 for the shipbuilding sector in Bangladesh and offer recommendations for its successful integration.Item DEVELOPMENT OF A MATLAB BASED FRAMEWORK FOR MOTION SIMULATION OF AN UROV(2024-03) DEBNATH, RATUL; SHITAB, TASHDID AHMEDThis study presents a comprehensive analysis of underwater maneuvering mission simulation using MATLAB. It emphasizes the importance of mission simulation in optimizing the performance of underwater vehicle in various mission scenarios, prior the actual field deployment. The study reviews the current state of underwater vehicles and robotics to highlight the challenges associated with underwater missions. The methodology involves developing a simulation model that incorporates the kinematics, dynamics, and sensor models of the pre-designed underwater robot, as well as the characteristics of the underwater environment. The simulation model considers the effects of sensor noise, data fusion, and decision-making algorithms on the vehicle’s performance in completing different mission tasks. The model can provide complete visualization and analysis of pre-mission, pseudo mission, and post-mission scenarios in MATLAB Simulink. The simulation framework further provides a way to safely tune parameters for implementing control algorithms. The research findings suggest that the proposed mission simulation model can serve as a valuable tool for optimizing maneuvering performance of underwater vehicles for different mission applications. By providing a safe and controlled environment for testing and training, mission simulation can help prepare operators, even the remote ones, for the demands of real-world underwater missions and enhance their decision- making abilities and situational awareness.