Volume 3, Issue 5, May 2021

Analytical Displacement Model of Wind Turbine Towers under Loading Conditions

Akash Raikwar; Siraj Ahmed; Vilas Warudkar

International Research Journal on Advanced Science Hub, 2021, Volume 3, Issue 5, Pages 90-100
DOI: 10.47392/irjash.2021.125

The goal of this work is in twofold: 1) to determine the directional deformation (deflection) and bending stress of 1.25 MW Suzlon wind turbine tower under loading conditions for different cross-sections through finite element analysis method; 2) to develop and validate the analytical model allowing to estimate same for different cross-sections. Wind shear force has been calculated in the prevailing direction of the wind for tower structures through integral equations, are then used as input for 3-dimensional finite element model to compute the tower deflection and bending stress. To improve the estimation of tower deflection, a mathematical model is developed based on cantilever beam theory. Results are then compared with those obtained from numerical analysis method. The wind turbine tower deflection is found maximum at the tip of the structure and increasing with the hub height. Results indicate that the square cross-section tower is superior with respect to tower deflection with a maximum deflection of 0.064 mm. Numerical analysis method is used to verify the results of mathematical tower deflection model showing very less percentage of error. Thus, the new mathematical model has the advantage of estimating the tower deflection by just knowing the average wind speed of a wind farm for any wind turbine tower structure.

Al7129 Metal matrix enhanced with Titanium carbide (TiC) and Boron carbide(B4C) optimized machining parameters utilizing Taguchi method for Surface roughness

MADRI RAJESH; Naga Malleswara Rao G; Chandra Mohana Reddy B.

International Research Journal on Advanced Science Hub, 2021, Volume 3, Issue 5, Pages 101-107
DOI: 10.47392/irjash.2021.126

The influence of spindle speed, feed rate, and depth of cut of alumina particle on lowering surface roughness during turning of Al7129/TiC/B4C hybrid composite is investigated in this study. The composite is turned using a TiN coated solid carbide tool. Taguchi's experimental design concept is utilized to optimize three tiers of design parameters for improved for better surface finish. The results of the experiments and the microstructure of the machined surface demonstrate that the samples with the lowest feed rate perform better in terms of surface roughness. Surface roughness is also influenced by the wt% of alumina, which is followed by spindle speed when spinning the produced samples.

Explosion and Fire Resistance of Recycled Constituent Reinforced Concrete Structures

Ayush Meena; Ajay Singh Jethoo; Ramana P.V.

International Research Journal on Advanced Science Hub, 2021, Volume 3, Issue 5, Pages 108-115
DOI: 10.47392/irjash.2021.127

In the past few decades, the impact of explosions on buildings has been the area of research, mainly because buildings worldwide are increasingly facing the risk of deliberate explosion attacks, accidental explosions, and other forms of related explosion failure. The magnitude of the explosive load generated by most explosions is much higher than the design load of conventional structural engineering. As a result, with the intensification of global terrorist attacks, building owners, government departments, and design professionals have become more aware of the vulnerability and survivability of structures to explosive loads. Although much work on the impact of explosions on infrastructure continues, especially in India, numerical work to test explosives has been restricted. In addition, there are few computational tests for reinforced concrete beam-column joint to withstand explosive loads within a close range with a ruler spacing of less than as mentioned in IS: 1449. This may be due to the unreliable accuracy and relatively low survivability of most tools in this area.

Reprocessed Materials Evaluation on Perfunctory and Flame Endurance of Structures

Anamika Agnihotri; Ajay Singh Jethoo; Ramana P.V.

International Research Journal on Advanced Science Hub, 2021, Volume 3, Issue 5, Pages 116-123
DOI: 10.47392/irjash.2021.128

The fire resistance of concrete with low fire resistance and meagre fire resistance can be improved by replacing the cement in the concrete mixture with different GGBS ratios. By partially substituting cement with GGBS (ground blast furnace slag), which can be used as an additive to assure excellent heat resistance in concrete, the GGBS can help lower the price of concrete mixtures, prevent concrete from cracking, reduce high temperatures and increase compressive strength. For OPC concrete mixtures, the exact optimal cement substitution rate of GGBS (15-60%, in steps of 15%) must be reached for mechanical (compressive strength, tensile strength and flexural strength) analysis, durability (constant pressure and water absorption), GGBS concrete mixture mass loss due to acid attack and microstructure characteristics (FESEM and FTIR), assuming a water-cement ratio of 0.4. (Mixture 1 with 100% and Mixture 2 with the best GGBS percentage) After exposure to the flame, the resistance is calculated. Curing HSC performance is observed under the influence of thermal annealing. Higher temperature is observed in various mixtures and densities.