https://irju.jdvu.ac.in/jspui/handle/123456789/73 2026-07-07T13:17:40Z https://irju.jdvu.ac.in/jspui/handle/123456789/10178 Title: Civil Engineering-Question Papers-2025 Authors: Jadavpur University 2025-01-01T00:00:00Z https://irju.jdvu.ac.in/jspui/handle/123456789/9416 Title: Particle damper modelling for vibration control Authors: Ghosh, Biswajyoti Abstract: Engineering has for a long time been confronted with the problem of structural vibrations which has the possibility of compromising the operations and safety of many systems and structures. A new class of passive vibration control systems known as particle dampers has emerged as a possible solution to these oscillations and enhance the structure. This thesis focuses on the particle damper modelling by employing the ANSYS computational tools and stresses on the comparable method that considers the balance between model precision and computational efficiency. The method of the research is based on the creation of the accurate particle damper models where the boundary conditions, geometrical representation and material characteristics are set to reproduce the behaviour observed in the real world. The behaviour of the particles and the structure is analysed dynamically through transient analysis and the interaction between the particles and the structure under various stress conditions is studied. Besides shedding light on previously unknown scenarios, in which particles violate boundary boundaries, the thesis reveals significant findings on the behaviour of particle dampers, especially under seismic forces. This result underlines the significance of accurate definition of boundary conditions and constraints for modelling. The finding has potential applications in a wide range of future studies in the areas of fluid-structure interactions, real-time control strategies, advanced particle dynamics modelling, and machine learning. The practical applications offer the possibility of developing more accurate and efficient structural vibration control systems in aerospace and architecture fields. In conclusion, this thesis is a significant step towards achieving the objective of understanding and mastering ANSYS particle damper modelling and has the potential to revolutionise the field of structural dynamics by enhancing the safety and force bearing capacity of structures. This snapshot provides a clear and detailed idea about your thesis work, the techniques employed, the findings and future scope of multiple researches and practical implications in the field of modelling particle damper. 2024-01-01T00:00:00Z https://irju.jdvu.ac.in/jspui/handle/123456789/9415 Title: Use of cupola slag as fine aggregate in concrete Authors: Santra, Rajesh Abstract: The growing scarcity of natural sand and the increasing demand for sustainable construction have driven the search for alternative materials in concrete production. One promising option is cupola slag, an industrial waste by product generated during cast iron production in cupola furnaces operating at temperatures between 1400°C and 1600°C. The disposal of cupola slag is a matter of burden for the manufacturers of casting industry. It is may be mentioned that cupola slag contains only 10.7% CaO which is quite less than Granulated Blast Furnac Slag (GGBFS) . Thus, it is not economically viable to replace the cement partially after grinding. Although it contains substantial amount of amorphous silica, the use of cupola slag as partial cement like fly ash as it requires fine grinding and will generate carbon foot print. Thus, recycling of cupola slag as a partial replacement for aggregate. This requires less energy compared to fine grinding. This will not only help reduce waste but also conserves natural resources. Few researchers have used cupola slag as a coarse aggregate in concrete. Based on the above background, the present study focuses on the use of cupola slag as a fine aggregate replacing the natural sand to develop a practical way of solid waste management. The study is limited to normal grade concrete of grade M25. Cupola based fine aggregate has been prepared from chunks by hand grinding in the laboratory. The grading has been prepared as Zone II (as per IS 383-2017) which is similar to natural sand. It may be mentioned here that this can be made to Zone I and can be suitable used as manufactured sand. The cupola slag is used as fine aggregate (FA), partially replaced by 0–50% (by weight) in the step of 10% (by weight). The experimental results indicate that the dry density of concrete mix increase with the increased weight percent of cupola slag based FA (CS) in concrete. The compressive strength and split tensile strength at 28 day specimens increased with the increase of replacement percentage of Cupola slag up to 40% replacement compared to the control specimen. In such cupola based concrete, the water absorption of concrete is less by about 1.23% for 40% replacement compared to the control specimen. The chloride ions penetration in cupola based concrete decreases with the increase of Cupola slag as fine aggregate in concrete. Field Emission Scanning Electron Microscope (SEM) images revealed that use of Cupola slag modifies the concrete microstructure and fill the small pores. EDS and XRD based microstructure analysis indicates such improvement in microstructure with the development of new compound in the cupola slag based concrete. However more study is needed for other concrete grade and with the mechanically prepared cupola based fine aggregate. 2024-01-01T00:00:00Z https://irju.jdvu.ac.in/jspui/handle/123456789/9414 Title: Dynamic analysis of rectangular liquid containers with elastic baffle Authors: Deb, Supriya Abstract: In the present study, fundamental time period and the hydrodynamic pressure exerted by the fluid on walls of rectangular tanks due to sinusoidal excitations are investigated by pressure based finite element method. The fluid within the tank is considered to be water and tank walls are assumed as rigid. However, the baffle within the tanks is considered to be flexible. The fluid within the tank is considered as inviscid and fluid motion is irrotational. Galerkin approach is used for finite element formulation of wave equation. Newmark’s average integration method which is unconditionally stable is used to obtain the response of baffle-liquid coupled system. The present algorithm also includes the compressibility of water within tank. The efficacy of the present algorithm has been demonstrated through numerous examples both for free and forced vibration analysis. The time period increases with presence of elastic baffle within the tanks. The time period of baffle-liquid coupled system also increases with the increase of tank length. An increasing trend of fundamental time period of baffle-liquid coupled system is also observed with the increase of liquid height within the tanks. However, the influence of height of fluid in fundamental time period of this coupled system is greater than those for the length of tanks. The free vibration responses of this coupled system also increase with the increase of flexibility of baffle wall. Position of the baffle within the tanks also influences the free vibration response of the tank with baffle. Similar to the height of baffle, the thickness of baffle also changes the flexibility of baffle within tanks hence the increase in baffle thickness reduces the time period of the baffle-fluid coupled system. Similar to the fundamental time period of baffle-fluid coupled system, the hydrodynamic pressure within the tanks due to different excitations depends on the different parameters of tank and baffle. The hydrodynamic pressure at the bottom of tank wall increases with the increase of baffle thickness. However, this hydrodynamic pressure at free surface decreases with the increase of baffle thickness. Hydrodynamic pressure at bottom surface of tank increases with decrease in fluid height. Hydrodynamic pressure at bottom surface of tank increases with increase in tank length. However, there is no notable variation in hydrodynamic pressure at free surface due to change in tank length. The dynamic response is amplified when the system is experienced external loadings having frequency close to natural frequency of the system. 2024-01-01T00:00:00Z