http://heritageit.dspaces.org/jspui/handle/123456789/9737 2026-10-04T09:55:48Z 2026-10-04T09:55:48Z Rahman, Afroze Kundu, Anindita Banerjee, Sumanta http://heritageit.dspaces.org/jspui/handle/123456789/10938 2026-09-17T13:10:13Z 2025-05-06T00:00:00Z

Title: IQ-RRT*: a path planning algorithm based on informed-RRT* and quick-RRT* Authors: Rahman, Afroze; Kundu, Anindita; Banerjee, Sumanta Abstract: Optimal path planning algorithms such as the RRT* and its variants seek to generate the best feasible path from an initial state to a goal state in the least possible time. Prior work on RRT* has focused on improving the convergence rate of the algorithm while keeping its computational complexity unchanged. Informed-RRT* and quick-RRT* are two such variants that, in certain scenarios, converge to the optimal path faster than RRT* does. This work focuses on the novel addition of informed sampling to quick-RRT* to enhance its convergence rate. The resultant algorithm provides initial solutions with costs comparable to quick-RRT* and convergence rates at par with quick-RRT* in the worst case. The authors have concluded that this new algorithm, named IQ-RRT*, outperforms informed-RRT* and quick-RRT* in a multitude of scenarios. IQ-RRT*, unlike quick-RRT*, is a faster alternative to informed-RRT* even in cluttered environments and mazes with long corridors.

2025-05-06T00:00:00Z Banerjee, Debiprasad Halder, Pabitra http://heritageit.dspaces.org/jspui/handle/123456789/10937 2026-09-17T13:09:33Z 2025-05-27T00:00:00Z

Title: Computational analysis of shock wave diffraction for convex slabs Authors: Banerjee, Debiprasad; Halder, Pabitra Abstract: The present study is centered on the vortexlets in the shock wave diffraction over three different slabs (60°, 90°, and 120°) for shock Mach numbers of 1.65, and 3.0. The third-order accurate implicit solver is built on advection upstream splitting along with least squares cell-based method and utilizes the benefits of refined mesh in the regions having high discontinuities. Vortexlet formation, pressure ratio and specific heat flux on the step wall, and movement of the separation point are some of the key aspects of the present analysis. For the numerical simulation of the moving shock, the Finite Volume Method is utilized to find the solutions of the governing equations. Vortexlets, secondary shock, embedded shock, contact surface, slipstream, expansion fan, and vortex are captured precisely. Apart from isopycnics; isobars, isotherms, and velocity contours are plotted as well. Our results emphasize the fact that there exists two types of vortexlets, which are different in their positions apart from their driving mechanisms.

2025-05-27T00:00:00Z Bagchi, Abhishek Sarkar, Suman Bysakh, Sandip Mishra, Vidhyadhar Das Gupta, K. Maity, T. Biswas, Amalendu Sarkar, Susenjit http://heritageit.dspaces.org/jspui/handle/123456789/10936 2026-09-17T13:07:13Z 2023-01-01T00:00:00Z

Title: Probing the photo induced micro actuation properties of optimized Cu doped Co-34at%-Ni-35at%-Al-31at% ferromagnetic shape memory alloys Authors: Bagchi, Abhishek; Sarkar, Suman; Bysakh, Sandip; Mishra, Vidhyadhar; Das Gupta, K.; Maity, T.; Biswas, Amalendu; Sarkar, Susenjit Abstract: The strange Photo induced micro actuation (PIMA) properties associated with Cu doped Co-Ni-Al Ferromagnetic Shape Memory Alloys (FSMA) has showed enhancement of mechanical properties in our early studies. This enhancement and optimized PIMA properties have opened a scope of various laser-controlled real engineering applications. In this study, we have explored the microstructural scaling and determined the evolved force due to the laser action in optimized Cu doped Co-Ni-Al alloy system with a detailed insight. This unique PIMA property is rare in literature and actual reason are still not explored. EBSD, TEM, AFM/MFM based techniques were further adopted to understand the role of microstructure in more detail. The evolved magnetic domain patterns for actuating and non-actuating alloys have been analyzed in details. Atomic Force Microscopy was adopted to estimate the constitutive mechanical properties of the thin alloy samples by mechanical spectrometry. This estimation was directly used to predict a general trend in force distribution pattern of the Cu-Co-Ni-Al alloys strips through FEM analysis. The crux of FEM based model and its simulated results can be applied for real time PIMA oriented engineering application and device manufacturing. The detail microstructural exploration and its effect in the PIMA response along with generalized deflection-force model have been presented in the current study.

2023-01-01T00:00:00Z Biswas, Amalendu http://heritageit.dspaces.org/jspui/handle/123456789/8657 2026-09-17T13:07:51Z 2024-01-01T00:00:00Z

Title: Higher Order Approximations for Bending of FG Beams Using B-Spline Collocation Technique Authors: Biswas, Amalendu Abstract: In the present study, a functionally graded cantilever beam has been analyzed to observe its deformation behavior and stress variations. While the material properties (modulus of elasticity, modulus of rigidity, and density) have been varied along the height of the beam, Poisson’s ratio has been considered a constant. The governing equations have been derived using Hamilton’s Principle in the framework of higher-order beam theory. The derived equations are then simplified to a single equation, which is similar to that of isotropic beams. However, the work is extended to include a few higher-order terms and to study the effect of the incorporation of these terms on the resulting FG beam behavior. The development of a single governing equation for studying the statics and dynamics of an FG beam with the incorporation of higher-order terms is a unique part of the report. The solution of the governing equation is approached using approximate methods; in this work, the B-spline collocation technique is used to arrive at the results. A sixth-order Bspline basis function is used as an approximating polynomial, and the Greville abscissa has been used to generate collocation points. The obtained results have been verified against standard literature to find a satisfactory match. The results include comparative plots for normalized bending and transverse shear stresses, with and without the inclusion of higher-order terms. The results are then extended to study the effect of material index on the deformation and stress behavior of FG beams. The effect of aspect ratio on results is also studied for comparison of various beam theories.

2024-01-01T00:00:00Z