http://20.198.91.3:8080/jspui/handle/123456789/75 Sun, 05 Apr 2026 18:27:28 GMT 2026-04-05T18:27:28Z http://20.198.91.3:8080/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. Mon, 01 Jan 2024 00:00:00 GMT http://20.198.91.3:8080/jspui/handle/123456789/9416 2024-01-01T00:00:00Z http://20.198.91.3:8080/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. Mon, 01 Jan 2024 00:00:00 GMT http://20.198.91.3:8080/jspui/handle/123456789/9415 2024-01-01T00:00:00Z http://20.198.91.3:8080/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. Mon, 01 Jan 2024 00:00:00 GMT http://20.198.91.3:8080/jspui/handle/123456789/9414 2024-01-01T00:00:00Z http://20.198.91.3:8080/jspui/handle/123456789/9413 Title: Shear strength behaviour of silty soil in Kolkata region Authors: Tripathi, Dinabandhu Abstract: Silty soil / clayey silt / silty clay is a commonly available soil found in the upper reaches, down to a depth of 3-4m to even 15-16m in some locations, of soil deposit in and around Kolkata, India. This silty soil as available in the Kolkata region is generally light brown in color, with low plasticity, and it has low to moderate strength on saturation. Such deposits are also found in the alluvial deposits of north India, particularly in Ganga basin areas. Hence it is very much important to study the behavior of such soil in order to gain some knowledge of their properties, particularly their shear strength under various conditions to meet the requirements from engineering practices. Though a number of studies have been conducted in this direction, in general, the properties of reported silty soil may not be applicable for to all types of soil. Therefore, to better analyze the characteristics of locally available silty soil, this thesis highlights the shear strength behaviour of the silty soil as collected from a depth of 2-3m of the Rajarhat zone of Kolkata and analyzes their shear strength parameters at different dry densities and moisture contents based on the results of the conventional direct shear test. The dry sample exhibited maximum friction angle and after adding water to the sample, there is a sharp decline in the value of friction angle which goes on decreasing with further addition of water, due to the fact that water acting like a lubricant and is decreasing the friction. It is further noticed that there is a general trend of rising in the value of friction angle with the rise in the dry density. These findings ascertains that the shear strength of the silty soil of the Kolkata region also increase with the increase in dry densities and decrease with the increase of moisture content for same dry density. Also it can be ascertained from the test results that like granular soils, silt also shows greater shear stress with the increase of normal stress. Finally, this study reveals that, for different moisture content (w) and dry density (γd) internal friction angle (φ) varies from 24.22 degree to 33.14 degree and cohesion (c) varies from 0.024 to 0.232 kg/cm2 respectively. Maximum friction angle has been found for dry soil while maximum cohesion for soil at 4% water content. Mon, 01 Jan 2024 00:00:00 GMT http://20.198.91.3:8080/jspui/handle/123456789/9413 2024-01-01T00:00:00Z