Reducing Large Viking I Based Martian Entry, Descent and Landing Response Surface Methodology Produced Quadratic Models

2016 ◽  
Author(s):  
Narcrisha Norman ◽  
Sonya Smith
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Landing Response ◽  
Quadratic Models

scholarly journals Experimental Study and Response Surface Methodology for Investigation of FSP Process

2014 ◽  
Vol 61 (4) ◽  
pp. 539-552
Author(s):  
Marek Stanisław Weglowski
Keyword(s):  
Experimental Study ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Parent Material ◽  
Quadratic Model ◽  
Friction Stir ◽  
Microstructure Refining ◽  
Quadratic Models

Abstract The article presents the effect of rotational and travelling speed and down force on the spindle torque acting on the tool in Friction Stir Processing (FSP) process. The response surface methodology (RSM) was applied to find a dependence combining the spindle torque acting on the tool with the rotational speed, travelling speed and the down force. The linear and quadratic models with interaction between parameters were used. A better fitting was achieved for a quadratic model. The studies have shown that the increase in rotational speed causes a decrease in the torque while the increase in travelling speed and down force causes an increase in the torque. The tests were conducted on casting aluminium alloy AlSi9Mg. Metallography examination has revealed that the application of FSP process results in a decrease in the porosity in the modified material and microstructure refining in the stir zone. The segregation of Si and Fe elements was evident in the parent material, while in the friction stir processed area this distribution was significantly uniform.

Experimental Investigations on Drilling Characteristics of Cenosphere Reinforced Epoxy Composites

2015 ◽  
Vol 766-767 ◽  
pp. 801-811 ◽  
Author(s):  
S.B. Angadi ◽  
Rashmi Melinamani ◽  
V.N. Gaitonde ◽  
Mrityunjay Doddamani ◽  
S.R. Karnik
Keyword(s):  
Surface Roughness ◽  
Response Surface Methodology ◽  
Epoxy Resin ◽  
Response Surface ◽  
Epoxy Composites ◽  
Experimental Investigations ◽  
The Matrix ◽  
Drill Diameter ◽  
Full Factorial ◽  
Quadratic Models

In the present paper, the experimental investigations on drilling characteristics of cenosphere reinforced epoxy composites with cemented carbide drill have been presented. The drilling aspects such as thrust and hole surface roughness have been performed as function of four process parameters, namely, spindle speed, feed rate, drill diameter and % weight of the filler. Composite specimens were prepared with 20%, 40% and 60% by weight of cenosphere filler in epoxy resin as the matrix. The full factorial design (FFD) has been employed for conducting drilling experiments and the proposed drilling characteristics were analysed using response surface methodology (RSM) based quadratic models. The response surface analysis reveals that the addition of cenosphere as filler in epoxy resin appreciably decreases with the thrust and hole surface roughness for the developed composites.

Optimization of Preparation of Microwave Irradiated Bio-Based Materials as Porous Carbons for VOCs Removal Using Response Surface Methodology

2014 ◽  
Vol 554 ◽  
pp. 175-179 ◽  
Author(s):  
Jibril Mohammed ◽  
Noor Shawal Nasri ◽  
Muhammad Abbas Ahmad Zaini ◽  
Usman Hamza Dadum ◽  
Murtala Musa Ahmed
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Microwave Power ◽  
Irradiation Time ◽  
Porous Carbons ◽  
Influence Of Process Parameters ◽  
Impregnation Ratio ◽  
Preparation Conditions ◽  
Activating Agent ◽  
Quadratic Models

Effluents from various industries release volatile organic compounds (VOCs) into the environment which causes serious environmental problems. Coconut shell based porous carbons (CSPC) were synthesized with potassium hydroxide as activating agent for adsorption of Benzene and Toluene. Central composite design (CCD) method under the response surface methodology (RSM) of the Design expert software version 7.1.6. was employed in the optimization of the preparation conditions of the porous carbons. The effects of three preparation variables (i.e. microwave power, irradiation time and KOH impregnation ratio) on Benzene and Toluene adsorption were studied. Based on the CCD, quadratic models were developed to correlate the preparation variables to the responses (Benzene and Toluene adsorption). The influence of process parameters on the properties of CSPC was examined using analysis of variance (ANOVA) to identify the significant parameters. The optimum condition was obtained at microwave power of 500W; irradiation time 4mins; and 1.5 KOH impregnation ratio, which resulted in 84% of Benzene and 85% of Toluene respectively at 95% yield.

scholarly journals Application of Taguchi method and response surface methodology into the removal of malachite green and auramine-O by NaX nanozeolites

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Siroos Shojaei ◽  
Saeed Shojaei ◽  
Shahab S. Band ◽  
Amir Abbas Kazemzadeh Farizhandi ◽  
Milad Ghoroqi ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Taguchi Method ◽  
Response Surface ◽  
Malachite Green ◽  
Dye Removal ◽  
Environmental Water ◽  
Operating Conditions ◽  
Auramine O ◽  
Quadratic Models ◽  
Maximum Removal

AbstractIn the present study, the simultaneous removal of malachite green (MG) and auramine-O (AO) dyes from the aqueous solution by NaX nanozeolites in a batch system is investigated. Taguchi method and response surface methodology (RSM) were used to optimize and model dye removal conditions. In order to do so, the effect of various factors (dyes concentration, sonication time, ionic strength, adsorbent dosage, temperature, and pH of the solution) on the amount of dye removal was evaluated by the Taguchi method. Then, the most important factors were chosen and modeled by the RSM method so as to reach the highest percentage of dye removal. The proposed quadratic models to remove both dyes were in good accordance with the actual experimental data. The maximum removal efficiencies of MG and AO dyes in optimal operating conditions were 99.07% and 99.61%, respectively. Also, the coefficients of determination (R2) for test data were 0.9983 and 0.9988 for MG and AO dyes, respectively. The reusability of NaX nanozeolites was evaluated during the adsorption process of MG and AO. The results showed that the adsorption efficiency decreases very little up to five cycles. Moreover, NaX nanozeolites were also applied as adsorbents to remove MG and AO from environmental water samples, and more than 98.1% of both dyes were removed from the solution in optimal conditions.

scholarly journals Optimization of Polyetherimide Based CMS Membranes Preparation Conditions for CO2/CH4 Selectivit

2017 ◽  
Vol 14 (1) ◽  
Author(s):  
M. A. Ahmad ◽  
N. K. A. Rashid ◽  
B. H. Hameed
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Molecular Sieve ◽  
Pyrolysis Temperature ◽  
Polymer Concentration ◽  
Carbon Molecular Sieve ◽  
Optimization Analysis ◽  
Preparation Conditions ◽  
Quadratic Models

Response surface methodology (RSM) was used to determine the optimum preparation conditions of polyetherimide based carbon molecular sieve (CMS) membranes. Two quadratic models were developed to correlate the pyrolysis temperature, pyrolysis time and polymer concentration to the responses; CO2 permeance and CO2/CH4permselectivity. According to the optimization analysis, the optimum preparation conditions were obtained by using pyrolysis temperature of 725°C, pyrolysis time of 3.0 h and polymer concentration of 8.52%, which resulted in CO2 permeance and CO2/CH4 permselectivity of 3.61×10–10 mol/m2.s.Pa and 4.35, respectively.

Application of response surface methodology to investigate nano-finishing of the silicon wafer

2021 ◽  
pp. 2150134
Author(s):  
Mohammad Mosavat ◽  
Abdolreza Rahimi
Keyword(s):  
Surface Roughness ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Silicon Wafer ◽  
Abrasive Particle ◽  
Box Behnken Design ◽  
Abrasive Finishing ◽  
Quadratic Models ◽  
Abrasive Size ◽  
Significant Factors

The aim of this research is study the effect of polishing factors to the reduction ratio rate in surface roughness (%[Formula: see text] during the Magnetic Abrasive Finishing (MAF) process using Response Surface Methodology (RSM). The parameters studied were machining gap, rotational speed, abrasive size and magnetic abrasive particle (MAP) size. Quadratic models were developed by applying Box–Behnken Design (BBD). Also, experiments were carried out on the silicon wafer and results of surface roughness data were analyzed by using analysis of variance (ANOVA) and significant factors were identified. According to our findings, the maximum %[Formula: see text] value and the best surface roughness of silicon wafer achieved 3.70 and 51 nm, respectively.

Optimization Process for Producing Mesopores Activated Carbon Based on Hevea Brasiliensis Seed Coat Using Response Surface Methodology

2011 ◽  
Vol 364 ◽  
pp. 382-387
Author(s):  
Mohd Nazri Idris ◽  
Zainal Arifin Ahmad ◽  
Zakaria Mohd Amin ◽  
Mohd Azmier Ahmad
Keyword(s):  
Response Surface Methodology ◽  
Activated Carbon ◽  
Response Surface ◽  
Seed Coat ◽  
Hevea Brasiliensis ◽  
Activation Time ◽  
Activation Temperature ◽  
Temperature Activation ◽  
Quadratic Models ◽  
Significant Factors

The conditions for the preparation of rubber (hevea brasiliensis) seed coat based activated carbon (RSCAC) treated with NaOH were optimized through response surface methodology (RSM). The effects of three preparation variables: the activation temperature, activation time and NaOH impregnation ratio (IR) on Remazol Brilliant Blue R (RBBR) removal from aqueous solutions and RSCAC yield were investigated. Based on the RSM, two quadratic models were respectively developed to correlate the preparation variables to the RBBR percentage removal and carbon yield. The significant factors on each experimental design response were identified from the analysis of variance (ANOVA). The optimum conditions for RSCAC preparation were obtained by using activation temperature of 700 °C, activation time of 1.0 h and IR of 1.0, which resulted in 70.82% of RBBR removal and 24.93% of RSCAC yield.

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