Entity

Time filter

Source Type

Ludhiāna, India

Singh S.,Punjab Technical University | Singh R.,Production Engineering
Journal of Manufacturing Processes | Year: 2015

In the present research work, wear modelling of Al-Al2O3 functionally graded material (FGM) prepared by fused deposition modelling (FDM) assisted investment casting (IC) process has been reported. The Taguchi L18 orthogonal array was used to develop a mathematical model for wear of FGM developed; based on dimensionless analysis. Six controllable input process parameters (namely filament proportion, volume of pattern, FDM density of pattern, barrel finishing time, barrel finishing media weight and number of IC slurry layers) were selected to give results in terms of wear. Analysis of variance has been conducted for the selection of significant parameters for mathematical modelling. The wear model developed was validated in terms of experimental results. © 2015. Source


Hochstenbach M.,Catholic University of Leuven | Notteboom C.,Catholic University of Leuven | Theys B.,Production Engineering | De Schutter J.,Catholic University of Leuven
International Journal of Micro Air Vehicles | Year: 2015

This paper presents the design and control of VertiKUL, a Vertical Take-Off and Landing (VTOL) transitioning tailsitter Unmanned Aerial Vehicle (UAV), capable of hover flight and forward flight for the application of parcel delivery. In contrast to existing transitioning UAVs, VertiKUL is not controlled by control surfaces, but exclusively by four propellers using differential thrust during hover flight, transition and forward flight. A numerical design method optimising range and payload is developed for initial sizing. A simulation model is implemented in Simulink to evaluate different control strategies before conducting test flights. A unique mid-level control strategy enabling intuitive control of VertiKUL which requires no pilot skills is developed. Fluent transition from hover to forward flight is achieved through an autonomous control strategy. Attitude control based on quaternions instead of Euler-angles is implemented to avoid singularities. The resulting design, VertiKUL, is built and test flown. Source


Singh S.,Punjab Technical University | Singh R.,Production Engineering
Robotics and Computer-Integrated Manufacturing | Year: 2016

Aluminium matrix composites (AMCs) have numerous applications in manufacturing sector. In the present research work, fused deposition modelling (FDM) assisted investment casting (IC) route has been explored for the development of Al-Al2O3 based functionally graded material. Initially, two alternative FDM filaments consisting of nylon-6, Al and Al2O3 (in different proportions) were fabricated on single screw extruder. These filaments were further used to prepare reinforced FDM patterns (which were barrel finished) for IC process. Taguchi L18 orthogonal array has been used to study the effect of processing parameters (like: filament proportion, volume of reinforced FDM pattern, density of FDM pattern, barrel finishing time, barrel finishing media weight and numbers of IC slurry layer) on micro hardness (MH) of Al-Al2O3 composites. Analysis of variance has been used to study the percentage contribution of input parameters and their significance effect on MH. The results of the study highlighted that density of FDM pattern and numbers of IC slurry layer have contributed around 80% for MH. Micro-structural analysis carried out on castings has justified the MH data. © 2015 Elsevier Ltd. Source


Singh R.,Production Engineering | Kapoor P.,Production Engineering | Singh S.,Production Engineering
Transactions of the Indian Institute of Metals | Year: 2015

Fused deposition modelling (FDM) is one of the commonly used processes, which read data from CAD drawing and generate 3-D objects layer-by-layer. In the present research work, biomedical implant (hip joint) has been developed by combination of two processes; FDM and investment casting (IC). Three controllable factors of the IC process (namely: number of layer, clay viscosity, dry time of primary coating) were studied at three levels each by Taguchi’s parametric approach and single-response optimization was conducted to identify the main factors controlling hardness of cast specimen. The master patterns of hip joint were of Acrylonitrile-Butadiene-Styrene (ABS) material (prepared with FDM process) and final cast specimens of stainless steel (SS-316L) were made through ceramic shell IC at recommended parameters. The results of study suggests that for hardness, contribution of number of layers, viscosity of primary dip and dry time of primary coating is 16.17, 65.8 and 13.63 % respectively. Further surface morphology has been used to analyze the hardness data. © 2015, The Indian Institute of Metals - IIM. Source

Discover hidden collaborations