A colossal research work is being consummated to propose the optimal machining parameters while necessitating current machining techniques to attain elegant products. This research work foregrounded the optimum process parameters of die sinking EDM with 8mm diameter copper electrode during machining AISI D2 steel. Taguchi’s L9 OA method was adopted to design 9 experiments in total and Pulse on time (Ton), Servo voltage (SV) and Peak current (IP) are chosen as input parameters. Three levels of each parameter were selected for designing the experimentation. A natural vegetable oil named Canola oil which is an extract from Canola seeds is taken as dielectric and all the values of Material Removal Rate (MRR), Tool Wear Rate (TWR) and Surface Roughness (SR) for each experiment were noted as the output responses. Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) and Grey Relational Analysis (GRA) which are two Multi-Criteria Decision Making (MCDM) methods were accompanied for determination of ideal parameters for machining AISI D2 steel. Ultimately it is espied that the coalescence of level 3 of pulse on time, level 2 of Peak Current and level 2 of servo voltage propounds the optimum result by performing TOPSIS and GRA.
In the current examination, adjustment of epoxy resin has been conducted by multi-walled carbon nanotube (MWCNT) by a consecutive cycle containing stirring, sonication and followed by vacuum degassing (VD). Accentuation has been centred on the impact of I) VD time (4, 12, 18 and 50 hours) of MWCNT/epoxy mixture and ii) MWCNT content in the epoxy resin (0.1 and 0.3 wt. % w.r.t epoxy) on flexural properties of MWCNT installed glass/epoxy-composite (MWCNT- GE) concerning the control glass/epoxy (GE) composites. Greatest flexural quality in the MWCNT (0.1%)- GE composite was acquired with 18 hours VD (27% higher than the control GE), whereas modulus was found to be maximum with 12 hours VD (nearly22% higher than control GE). Incorporation of a higher MWCNT content (0.3wt. %)resulted in a poor flexural performance due to agglomeration as confirmed from scanning electron microscope(SEM).
A prodigious research work is being effectuated to endorse the optimal machining parameters while entailing present day machining techniques to bring outclassy products. This research work insisted on suggesting the optimum process parameters of die sinking EDM with 8mm diameter copper electrode during machining AISI D2 steel using TOPSIS.Taguchi’s L9 Orthogonal Array method was adopted to design 9 experiments in total and Pulse on time (Ton), Servo voltage (SV) and Peak current (IP) are chosen as input parameters. Three levels of each parameter were selected for designing the experimentation. EDM oil which is a synthetic oil is selected as dielectric and all the values of Material Removal Rate (MRR), Tool Wear Rate (TWR) and Surface Roughness (SR) for each experiment were noted as the output responses. Analysis of Variance (ANOVA) was done to recommend the impact of each input parameter on output responses. Analytical Hierarchy Process (AHP) was used to select the weightage of each response and then Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) which is a multi-criteria decision analysis method, was accompanied for determination of ideal parameters for machining AISI D2 steel. Eventually it is descried that the amalgamation of level 3 of pulse on time, level 3 of Peak Current and level 3 of servo voltage propounds the optimum result.
Rocker bogies are fairly well used by many organizations like NASA, Military and Exploration channels like the National Geographic. Over the past decade NASA has built several roves with the rocker-bogie design due to the fact that it has become a proven mobility application known for its superior vehicle stability and obstacle-climbing capability, the most famous one being the Curiosity rover sent to Mars in 2011, and another one sent to land on an asteroid of interest. But current rocker bogie's designs are complex, costly and prone to mechanical failures. The current designs employ a six-wheel design which has a few drawbacks addressed in this report. Based on the well-known rocker-bogie suspension system, this report has specifics how the design of the original rover was tweaked and modified to significantly improve its functional and nonfunctional features in mainly three areas namely the stability, speed, and load-bearing capability. This work was based on findings on total deformation, Equivalent elastic strains and Equivalent stress acting on the proposed design. Extensive work has been done on areas like design, material selection, and operational features. The major one was the addition of an extra set of wheels which helped to maintain continuous contact with the ground. It has helped to increase required frictional force also. Some other non-functional features like a wireless camera addition and Bluetooth control support have also been added for increased functionality. CATIA was used for part modeling and assembly while Ansys was used for meshing and analysis. The maximum increase of up to 41 % was observed in structural stability in the proposed design.
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