Papers by Keyword: Taguchi Method

Abstract: Optimization of tapioca wastewater treatment by electrocoagulation has been conducted. Taguchi design experiment was used to calculate the optimum condition. Electrode distance, an electrical resistance of the wastewater and time of operation were used as the parameters. The results show that the electrocoagulation using bipolar stainless steel electrode was able to treat the cassava starch wastewater. The maximum pollutant removal percentage was achieved by the electrical resistance of 60 ohms at 1.5 cm electrode distance for 30 minutes.

Abstract: Optimization of molding parameter on the flexural strength of carbon black/graphite/epoxy (CB/G/EP) nanocomposites using Taguchi method was studied. Three molding parameters was chosen in this study which are molding temperature, molding pressure and molding time. Experimental trials were carried out based orthogonal array design using those three parameters. The results were analyses using the signal to noise (S/N) and analysis ofvariance (ANOVA). Flexural strength of the CB/G/EP nanocomposites increases from 56.23 MPa to 65.11 MPa usingoptimize parameter obtained from the analysis method. These results shown that the Taguchi method is successfully to get optimum parameters of molding parameters to produce CB/G/EP nanocomposites.

Abstract: This paper aims at investigating the deformation and damage mechanisms of auxetic sandwich panels subjected to localised blast. The ability of self-densifying and adjusting to the loads, typical of auxetic structures, has been evaluated. A numerical model of the auxetic cellular composite panel has been developed to conduct statistical studies on different parameters (core geometry and material) using Taguchi design of experiment (DOE) method combined with general linear model (GLM) for analysis of variance (ANOVA). The optimisation has been conducted evaluating different parameters: energy absorption of the entire panel and deformation of the back facet were measured. The analysis of the numerical model of the core suggests the importance of the self-adapting mechanism of the auxetic structure under blast loading.

Abstract: In this work, ballistic resistance of single and 2-layers aramid fabric structures with different weaving architectures and orientations were investigated via the impact tests carried out using a gas gun setup. To analyse the influence of each structural factors and their significance, a statistical study was performed using Taguchi method with a L9 matrix, which indicated the optimum structural arrangements for the 2-layer fabrics. The reduction of the velocity, the consequently absorbed energy, and the post-mortem failure modes were analysed to understand the ballistic resistance of the fabric structures studied. To investigate the damage mechanisms of different weaving structures, mesoscale Finite Element models were developed to observe the resultant velocity of the projectile, the deformation of the woven yarns, as well as the evolution of the energy components. The final model was then constructed in resembling the optimum structural arrangement derived from the Taguchi statistical study, which revealed the significance of yarn-yarn and yarn-projectile friction properties towards the ballistic resistance of the fabrics.

Abstract: Abstract. The purpose of this research is to determine the optimum machining parameter for Aluminium silicon alloy (AlSi) matrix composite, which has been reinforced with aluminium nitride (AlN), with three types of carbide inserts present. Experiments were conducted at various cutting speeds, feed rates and depths of cut, according to the Taguchi orthogonal array L₂₇. The signal-to-noise (S/N) ratio and analysis of variance are applied to study the characteristic performance of cutting speeds, feed rates, depths of cut and types of tool in measuring the tool life during the milling operation. The analysis of wear was done using a Sometech SV-35 video microscope according to ISO 3686. Through Taguchi analysis, it is concluded that a combination of high feed rate, high depth of cut, low cutting speed and insert TiB2 give a longer tool life. Therefore, the cutting speed of 230 m/min, feed rate of 0.8 mm/tooth, depth of cut of 0.5 mm and type of insert of TiB2 were the optimum machining parameters. These optimum parameters will help the automotive industry to have a competitive machining operation from both economical and manufacturing perspectives.

Abstract: Carbon–copper composites are attractive materials used for electrical applications, such as brushes for engines and generators, slip rings, switches, relays, lugs, contactor and current collector. Various methods can be used to prepare Carbon-copper composite, such as infiltration, sintering, cold pressing, hot pressing or isostatic pressing. However, powder metallurgy route is seen to be most favorable due to its possibility of producing uniform microstructure and excellent net shape product. In this work, carbon-copper composite is prepared using powder metallurgy route with warm compaction process. The compaction pressure (A), compaction temperature (B), post baking temperature (C) and compaction time (D) were optimized by Taguchi method. Hardness and transverse rupture strength (TRS) were used to assess the effect of warm compaction process. The experimental design is according to the L9 (3⁴) orthogonal array. Signal to noise and analysis of variance (ANOVA) are employed to analyze the effect of warm compaction parameters. It is found that the best parameters and their levels are A3B2C3D2 for the main effect of hardness and the best parameters and their levels for TRS is A3B2C3D1. It is also notified that optimized parameters of A3, B2 and C3 are identical for hardness and TRS. However, for parameter D, the best level for hardness is D2 and for TRS is D1. The ANOVA analysis proved that compaction temperature parameter is significant to hardness and TRS value whereas the others parameters are not significant.

Abstract: In order to obtain better surface quality after high speed milling high hardness mold steel, and reduce tool wear in cutting process, prolong the service life of cutting tools, obtain superior levels and optimal combination of cutting parameters in the test range. Through the design of orthogonal experiment, the use of Taguchi method, and noise ratio analysis and variance analysis of dry cutting high hardness mould steel PM60 under different cutting parameters; and finally, the optimal cutting parameters of surface roughness and cutting force value were predicted and verified. Research showed that: the worst cutting parameters influenced the surface roughness R_a was radial depth of cut a_e, its influence was highly significant, followed by spindle speed n and depth of axial cut a_p; the most serious impact cutting parameter of cutting force F was the feed speed v_f, followed by the spindle speed n and radial depth of cut a_e; verification test showed that the optimal cutting parameters combination were reasonable and the calculation errors of the predicted values and experimental values were very small, indicating that Taguchi method in cutting parameters optimization of cutting mould steel PM60 was valid.

Abstract: WC-Co composite materials possess a vast range of industrial applications owing to their excellent properties such as superior hardness, toughness and dimensional stability. Present article has been targeted at investigating the impact of different experimental conditions (power rating, cobalt content, tool material, thickness of work piece, tool geometry, and abrasive grit size) on penetration rate in ultrasonic drilling of WC-Co composite material. Taguchi’s L-36 orthogonal array has been employed for conducting the experiments. Significant factors have been identified using analysis of variance (ANOVA) test. The experimental results revealed that power rating, abrasive grit size, and tool profile is most significant factor for penetration rate. From the microstructure analysis, the modes of material deformation have been observed and the parameters (i.e. work material properties, grit size, and power rating) were observed as the most crucial for the deformation mode.

Abstract: In electrical discharge machining (EDM) process, electrode polarity plays an important role during machining operation. This paper addresses the issues of EDM utilizing the positive and negative tool-electrode polarity to explore the effects on the performance criteria such as material removal rate (MRR), tool wear rate (TWR), surface roughness (SR) and micro-hardness during machining of Ti–5Al-2.5Sn (GradeVI) Ti alloy. The Ti-5Al-2.5Sn alloy was machined using copper-chromium electrode with positive and negative polarity by varying the peak current and pulse-on-time, while the pulse-off-time was kept constant. The result of study suggests that reverse polarity improves the MRR, TWR, SR while normal polarity improves the surface micro-hardness. The peak current has the maximum affect on machining performance for both types of polarities. Further the migration of different elements and formation of compounds on the machined surface was investigated using EDX and XRD analysis.

Abstract: The bus is a vehicle for transport the passenger to the destination safely. The bus manufacturing is produced directly from the company and the bus has been modifying from the bus garage. The Bus modify into popular use in the domestic because it is cheaper. The modified bus is also a safety issue because these vehicles to the tilted test 30 degrees most of the test is not passed. The center of gravity is influenced to the stability of the bus. Which the Company or modify bus garage can not know the position of the center of gravity in advance. When the bus is used to build a center of gravity located in improper placement. Hence, the test does not pass 30 degrees tilt.Which required costs to adjustment and test again. This paper was intended to study the variables that affect the center of gravity of the bus include engine placement, adjustment pressure into air suspension before build bus body, bending chassis, characterized by mounting to the chassis frame. Studies using instruments find the center of gravity of the bus used computer simulation center of gravity nearby real bus. The variable adjustment in order to design a bus with the appropriate center of gravity. Research has found that different variables adjustment engine placement characterized by mounting to the chassis frame have an affect to bending chassis relate to the center of gravity change, Therefore, the variables to be optimized, it is possible to design a bus safety.