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Optimization for Microbial Degumming of Ramie with Bacillus subtilis DZ_(5) in Submerged Fermentation by Orthogonal Array Design and Response Surface Methodology 被引量:1
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作者 刘芬 陈杨栋 +2 位作者 朱鹏 曹张军 张兴群 《Journal of Donghua University(English Edition)》 CAS 2023年第5期475-481,共7页
As a kind of natural fiber,ramie fiber has distinctive advantages in textile application,but the application is limited due to the traditional degumming mode.Compared with the traditional degumming process,the microbi... As a kind of natural fiber,ramie fiber has distinctive advantages in textile application,but the application is limited due to the traditional degumming mode.Compared with the traditional degumming process,the microbial degumming process has many advantages.To obtain the optimal conditions for degumming ramie with Bacillus subtilis DZ_(5)(BS DZ_(5)),a combined statistical approach of orthogonal array design(OAD)and response surface methodology(RSM)was used.The influences of initial pH of the bacteria medium,culture temperature,shaking speed,degumming time and inoculum size on submerged fermentation degumming were evaluated by using fractional factorial design.The main factors in the analysis were culture temperature,shaking speed and initial pH.The residual gum mass fraction was used as the optimization index,and the optimal conditions for degumming were determined by central composite design and RSM.Thus with only a limited number of experiments,an optimal ramie microbial degumming condition was found as the culture temperature of 40℃,the initial pH in the culture medium of 8.5,the shaking speed of 205 r/min,the degumming time of 96 h and the inoculum size of 5%.After microbial degumming of ramie under the optimal conditions,there was only 10.6%residual gum by mass in the fiber.In addition,the effective degumming of BS DZ_(5)was also confirmed by a scanning electron microscope(SEM). 展开更多
关键词 microbial degumming OPTIMIZATION RAMIE orthogonal array design(OAD) response surface methodology(RSM)
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Study on Mechanical Properties of High Fine Silty Basalt Fiber Shotcrete Based on Orthogonal Design
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作者 Jinxing Wang Yingjie Yang +5 位作者 Xiaolin Yang Huazhe Jiao Qi Wang Liuhua Yang Jianxin Yu Fengbin Chen 《Journal of Renewable Materials》 EI 2023年第8期3351-3370,共20页
In order to improve the comprehensive utilization rate of highfines sand(HFS)produced by the mine,full solid waste shotcrete(HFS-BFRS)was prepared with HFS asfine aggregate in cooperation with basaltfiber(BF).The strengt... In order to improve the comprehensive utilization rate of highfines sand(HFS)produced by the mine,full solid waste shotcrete(HFS-BFRS)was prepared with HFS asfine aggregate in cooperation with basaltfiber(BF).The strength growth characteristics of HFS-BFRS were analyzed.And thefitting equation of compressive strength growth characteristics of HFS-BFRS under the synergistic effect of multiple factors was given.And based on the orthogonal experimental method,the effects on the compressive strength,splitting tensile strength andflex-ural strength of HFS-BFRS under the action of different levels of influencing factors were investigated.The effect of three factors on the mechanical properties of HFS-BFRS,3,and 28 d,respectively,was revealed by choosing the colloidal sand ratio(C/H),basaltfiber volume fraction(BF Vol)and naphthalene high-efficiency water reducing agent(FDN)as the design variables,combined with indoor tests and theoretical analysis.The results show that the sensitivity of the three factors on compressive strength andflexural strength is C/H>FDN>BF Vol,and split-ting tensile strength is BF Vol>FDN>C/H.Finally,thefitting ratio of HFS-BFRS was optimized by the factor index method,and the rationality was verified by thefield test.For thefluidity of HFS-BFRS,the slump can be improved by 139%under the action of 1.2%FDN,which guarantees the pump-ability of HFS-BFRS. 展开更多
关键词 Solid wastes recycling high-fine silt basaltfiber total solid waste shotcrete orthogonal design
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A Spider Monkey Optimization Algorithm Combining Opposition-Based Learning and Orthogonal Experimental Design
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作者 Weizhi Liao Xiaoyun Xia +3 位作者 Xiaojun Jia Shigen Shen Helin Zhuang Xianchao Zhang 《Computers, Materials & Continua》 SCIE EI 2023年第9期3297-3323,共27页
As a new bionic algorithm,Spider Monkey Optimization(SMO)has been widely used in various complex optimization problems in recent years.However,the new space exploration power of SMO is limited and the diversity of the... As a new bionic algorithm,Spider Monkey Optimization(SMO)has been widely used in various complex optimization problems in recent years.However,the new space exploration power of SMO is limited and the diversity of the population in SMO is not abundant.Thus,this paper focuses on how to reconstruct SMO to improve its performance,and a novel spider monkey optimization algorithm with opposition-based learning and orthogonal experimental design(SMO^(3))is developed.A position updatingmethod based on the historical optimal domain and particle swarmfor Local Leader Phase(LLP)andGlobal Leader Phase(GLP)is presented to improve the diversity of the population of SMO.Moreover,an opposition-based learning strategy based on self-extremum is proposed to avoid suffering from premature convergence and getting stuck at locally optimal values.Also,a local worst individual elimination method based on orthogonal experimental design is used for helping the SMO algorithm eliminate the poor individuals in time.Furthermore,an extended SMO^(3)named CSMO^(3)is investigated to deal with constrained optimization problems.The proposed algorithm is applied to both unconstrained and constrained functions which include the CEC2006 benchmark set and three engineering problems.Experimental results show that the performance of the proposed algorithm is better than three well-known SMO algorithms and other evolutionary algorithms in unconstrained and constrained problems. 展开更多
关键词 Spider monkey optimization opposition-based learning orthogonal experimental design particle swarm
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Optimization of Center of Gravity Position and Anti-Wave Plate Angle of Amphibious Unmanned Vehicle Based on Orthogonal Experimental Method
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作者 Deyong Shang Xi Zhang +3 位作者 Fengqi Liang Chunde Zhai Hang Yang Yanqi Niu 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第5期2027-2041,共15页
When the amphibious vehicle navigates in water,the angle of the anti-wave plate and the position of the center of gravity greatly influence the navigation characteristics.In the relevant research on reducing the navig... When the amphibious vehicle navigates in water,the angle of the anti-wave plate and the position of the center of gravity greatly influence the navigation characteristics.In the relevant research on reducing the navigation resistance of amphibious vehicles by adjusting the angle of the anti-wave plate,there is a lack of scientific selection of parameters and reasonable research of simulation results by using mathematical methods,and the influence of the center of gravity position on navigation characteristics is not considered at the same time.To study the influence of the combinations of the angle of the anti-wave plate and the position of the center of gravity on the resistance reduction characteristics,a numerical calculation model of the amphibious unmanned vehicle was established by using the theory of computational fluid dynamics,and the experimental data verified the correctness of the numerical model.Based on this numerical model,the navigation characteristics of the amphibious unmanned vehicle were studied when the center of gravity was located at different positions,and the orthogonal experimental design method was used to optimize the parameters of the angle of the anti-wave plate and the position of the center of gravity.The results show that through the parameter optimization analysis based on the orthogonal experimental method,the combination of the optimal angle of the anti-wave plate and the position of the center of gravity is obtained.And the numerical simulation result of resistance is consistent with the predicted optimal solution.Compared with the maximum navigational resistance,the parameter optimization reduces the navigational resistance of the amphibious unmanned vehicle by 24%. 展开更多
关键词 Amphibious unmanned vehicle orthogonal experimental design anti-wave plate center of gravity resistance characteristic
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Optimization and Testing for PCR System of Rice by Orthogonal Design 被引量:8
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作者 程芳艳 李春光 +5 位作者 刘永巍 孟巧霞 张景龙 宋冬明 刘华招 孟昭河 《Agricultural Science & Technology》 CAS 2010年第2期61-64,共4页
[Objective] This study was to screen the economic or stable PCR system of rice and detect the generality of the selected system in different molecular markers based on PCR.[Method] With DNA extracted from rice leaves ... [Objective] This study was to screen the economic or stable PCR system of rice and detect the generality of the selected system in different molecular markers based on PCR.[Method] With DNA extracted from rice leaves by CTAB method as the template,PCR system was optimized by L16(45)orthogonal design.[Result] Clear bands were amplified from 16 different combinations,but the amplification effects and yields had difference.The most economic and applicable system was as follows:20 ng DNA template,150 μmol/L dNT... 展开更多
关键词 RICE PCR system optimization orthogonal design Dominant molecular markers testing
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Optimization of SRAP-PCR System of Triticum aestivum——Based on Orthogonal Design 被引量:2
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作者 艾鹏飞 武玉芬 魏景芳 《Agricultural Science & Technology》 CAS 2011年第3期366-368,374,共4页
[Objective] The aim was to optimize the technical procedure of SRAP-PCR in Triticum aestivum L. [Method] The orthogonal design L16(45) was used to optimize SRAP-PCR amplification system of wheat Fengyou 68 on five f... [Objective] The aim was to optimize the technical procedure of SRAP-PCR in Triticum aestivum L. [Method] The orthogonal design L16(45) was used to optimize SRAP-PCR amplification system of wheat Fengyou 68 on five factors (Taq polymerase,Mg2+,DNA template,dNTPs and primer) at four levels. [Result] Effects of the five factors on SRAP-PCR reaction system were Mg2+Taq polymerasedNTPsDNA templateprimer. Finally,an optimal SRAP-PCR system was established,that was the total 20 μl reaction system containing 2.0 μl 10×PCR Buffer,2.0 U Taq polymerase,2.0 mmol/L Mg2+,0.2 mmol/L dNTPs,40 ng DNA template and 0.6 μmol/L primer. [Conclusion] The optimum SRAP-PCR system had provided some technical foundations to conduct SRAP genetic analysis for wheat varieties. 展开更多
关键词 WHEAT SRAP orthogonal design OPTIMIZATION
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Study on Effects of Different Factors to Eggs Hatching Rate of Cryptotympana atrata by Orthogonal Design
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作者 孙会忠 宋月芹 +1 位作者 董钧锋 纠敏 《Agricultural Science & Technology》 CAS 2011年第4期551-553,共3页
[Objective] The paper aimed to explore influence of different factors on eggs hatching of Cryptotympana atrata,and optimize technical parameters in practice.[Method] By using hatching rate as index,L16(44)orthogonal... [Objective] The paper aimed to explore influence of different factors on eggs hatching of Cryptotympana atrata,and optimize technical parameters in practice.[Method] By using hatching rate as index,L16(44)orthogonal design was employed to determine the effects of the four factors including temperature,salinity,photoperiod and pH.[Result] Photoperiod had obviously effects on hatchability of Cryptotympana atrata eggs.The optimal conditions for hatching were temperature 30 ℃,salinity 25%,photoperiod L12∶D12,and pH 6.[Conclusion]The research provided some scientific basis for indoor artificial incubation. 展开更多
关键词 Cryptotympana atrata EGGS HATCHABILITY orthogonal design
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Storage stability of SBS modified bitumen based on mixed-level orthogonal array design
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作者 杨群 何文华 《Journal of Southeast University(English Edition)》 EI CAS 2012年第3期337-343,共7页
The styrene-butadiene-styrene(SBS) modified bitumens with different contents of SBS modifiers are stored in different conditions to study the storage stability of SBS modified bitumen.Mixed-level orthogonal array de... The styrene-butadiene-styrene(SBS) modified bitumens with different contents of SBS modifiers are stored in different conditions to study the storage stability of SBS modified bitumen.Mixed-level orthogonal array design(OAD) is used and factors such as SBS modifier content,storage time,storage temperature and container size are chosen in a mixed-level OAD with an OA16(31×44) matrix.Parameters like the separation softening point difference(the separation difference of the ring and ball softening point of the top and bottom samples) and the average softening point(the arithmetic mean of the softening points of the top and bottom samples) are proposed to evaluate the separation and the ageing of modified bitumen during storage in this experiment,respectively.The results reveal that the separation and the ageing during storage exhibit a complicated variation for storage temperature and time.The separation softening point difference decreases with the storage temperature rising from 20 to 120 ℃ and increases with the temperature exceeding 120 ℃,and the average softening point drops with the storage time being prolonged.Different storage conditions have various effects on the storage stability of SBS modified bitumen. 展开更多
关键词 storage stability mixed-level orthogonal array design separation softening point difference average softening point
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Optimization of RAPD-PCR Reaction System for Glycyrrhiza uralensis Based on Orthogonal Design 被引量:5
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作者 张增福 董建力 李明 《Agricultural Science & Technology》 CAS 2011年第10期1427-1429,共3页
[Objective] The aim was to obtain the optimum RAPD-PCR reaction system for Glycyrrhiza uralensis.[Method] Orthogonal design was adopted to screen the suitable concentration of four major factors(dNTPs,primers,Taq pol... [Objective] The aim was to obtain the optimum RAPD-PCR reaction system for Glycyrrhiza uralensis.[Method] Orthogonal design was adopted to screen the suitable concentration of four major factors(dNTPs,primers,Taq polymerase and DNA template) in PCR reaction system.[Result] The optimal reaction system obtained by orthogonal design was 25 μl in total volume,containing 2.5 μl of 10×PCR buffer solution(include MgCl2),2.5 μl of 10 mmol/L dNTPs,2 μl(100 ng) of DNA template,2 μl of 10 μmol/L primers,0.4 μl(5 U) of Taq polymerase;the optimum annealing temperature was 34 ℃.[Conclusion] Orthogonal design was an effective method for the optimization of RAPD-PCR reaction system for G.uralensis. 展开更多
关键词 Glycyrrhiza uralensis DNA RAPD-PCR Reaction system OPTIMIZATION orthogonal design
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Study on Rapid Propagation Medium of Atractylodes Lances by Orthogonal Design 被引量:1
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作者 李文 谢烨明 +2 位作者 罗翠平 李金华 曾万勇 《Agricultural Science & Technology》 CAS 2012年第1期49-52,共4页
[Objective] The aim was to protect wild resource of Atractylodes lances and to provide technical guidance for industrialization of Atractylodes lances. [Method] The test-tube seedlings were produced from seeds of Atra... [Objective] The aim was to protect wild resource of Atractylodes lances and to provide technical guidance for industrialization of Atractylodes lances. [Method] The test-tube seedlings were produced from seeds of Atractylodis Lances. At the same time, the effects of 6-BA, NAA and KT on the proliferation of aseptic seedling was studied through the orthogonal test. Effect of NAA concentration on the rooting of aseptic seedling was studied through nine types of light substrate groups, which consist of peat soil, fine sand and cotton seed hull, and their effects on Atractylodes lances growth were studied on with orthogonal design. [Result] The culture medium suitable for the proliferation of the Atractylodes lances tube seedling was MS+6-BA 1.0 mg/L+NAA 0.4 mg/L+KT 0,4 mg/L. And the medium suitable for rooting was 1/2MS+NAA 0.5 mg/L. The optimal ratio of soil, riversand and cotton seed hull was 3:3:2. [Conclusion] The research selected optimum culture medium, rooting medium and ratio of substrate, which provided technical guidance for laboratorial preservation of germplasm resource of Atractylodes lances and industrialization of its seedling production. 展开更多
关键词 Atractylodes lance(Thunb.)DC. orthogonal design HORMONE SUBSTRATE
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Orthogonal design for optimization of pigment extraction from surface sediments of the Changjiang River Estuary 被引量:7
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作者 ZHAO Jun YAO Peng +1 位作者 YU Zhigang Thomas S Bianchi 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2011年第4期33-42,共10页
Using a suitable solvent for extracting pigments from sediment for high performance liquid chromatography(HPLC) analysis is critical for obtaining qualitative and quantitative estimates of phytoplanktonic and benthi... Using a suitable solvent for extracting pigments from sediment for high performance liquid chromatography(HPLC) analysis is critical for obtaining qualitative and quantitative estimates of phytoplanktonic and benthic algal biomass,as well as community composition. Five methodological factors(sample dehydration,extraction solvent,extraction duration,number of extractions,and ratio of solvent volume:sample weight) were studied using an L 9(3 4 ) orthogonal design in a sedimentary pigment extraction experiment on samples collected from the Changjiang large-river delta-front estuary(LDE),using HPLC analysis. The results show that the optimal extraction method for sedimentary pigments should include freeze-drying samples prior to extraction. The effects of different factors on sedimentary pigment extraction were separated by the L 9(3 4 ) orthogonal design experiments and showed that the extraction solvent was the most important,with extraction duration the second most important,and numbers of extraction and ratio of solvent volume:sample weight was the least important. The mixed solvent treatment comprised of acetone,methanol and water(80:15:5,by volume) was best for polar pigment extraction,with 100% acetone better for apolar pigments. For most pigments employed in this study(i.e.,peridinin,fucoxanthin,alloxanthin,diatoxanthin,zeaxanthin,pheophytin-a and β-carotene) ,3 h was found to be enough time for extraction from these deltaic sediments. However,for chlorophyll-a,the most important pigment used for estimating algal biomass,12 h was needed. A small amount of solvent(3 ml) with duplicate extractions obtained the greatest amount and diversity of pigments. Unfortunately,no extraction method was found to be suitable for all pigments in sediments. The choice of extraction procedure should be made in accordance with the objective of each study,taking into consideration the properties of sediments and pigments in question. 展开更多
关键词 sedimentary pigments EXTRACTION orthogonal design HPLC Changjiang River Estuary
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Orthogonal design to sift the optimal parameter of Neiguan acupuncture for cerebral infarction 被引量:7
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作者 Yanan Zhang Sha Yang +5 位作者 Xiaonong Fan Shu Wang Nina He Lingxin Li Ding Luo Xuemin Shi 《Neural Regeneration Research》 SCIE CAS CSCD 2013年第28期2641-2648,共8页
The individual difference and non-repeatability in acupuncture have not only restricted the devel- opment of acupuncture, but have also affected the specificity of acupoints. The present study used instruments to cont... The individual difference and non-repeatability in acupuncture have not only restricted the devel- opment of acupuncture, but have also affected the specificity of acupoints. The present study used instruments to control needle depth, lifting and thrusting frequency, and the duration of acupuncture. Effects of the quantified acupuncture were observed at Neiguan (PC6) with different stimulation parameters. A frequency of 1, 2, or 3 Hz and duration of 5, 60, or 180 seconds were used to observe cerebral blood flow and ratio of infarct volume recovery. Results showed that stimulation at Neiguan with a frequency of 1 Hz and long duration of 180 seconds or 2/3 Hz and long duration of 5/60 seconds significantly increased cerebral blood flow and decreased the ratio of infarct volume. In- teractions between frequency and duration play a critical role in quantified acupuncture therapy. 展开更多
关键词 neural regeneration ACUPOINT quantified acupuncture NEIGUAN middle artery occlusion injury lift-ing and thrusting method orthogonal design lifting and thrusting frequency acupuncture duration grants-supported paper NEUROREGENERATION
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Orthogonal design and numerical simulation of room and pillar configurations in fractured stopes 被引量:7
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作者 吴爱祥 黄明清 +3 位作者 韩斌 王贻明 于少峰 缪秀秀 《Journal of Central South University》 SCIE EI CAS 2014年第8期3338-3344,共7页
Room and pillar sizes are key factors for safe mining and ore recovery in open-stope mining. To investigate the influence of room and pillar configurations on stope stability in highly fractured and weakened areas, an... Room and pillar sizes are key factors for safe mining and ore recovery in open-stope mining. To investigate the influence of room and pillar configurations on stope stability in highly fractured and weakened areas, an orthogonal design with two factors, three levels and nine runs was proposed, followed by three-dimensional numerical simulation using ANSYS and FLAC3~. Results show that surface settlement after excavation is concentrically ringed, and increases with the decrease of pillar width and distances to stope gobs. In the meantime, the ore-control fault at the ore-rock boundary and the fractured argillaceous dolomite with intercalated slate at the hanging wall deteriorate the roof settlement. Additionally, stope stability is challenged due to pillar rheological yield and stress concentration, and both are induced by redistribution of stress and plastic zones after mining. Following an objective function and a constraint function, room and pillar configuration with widths of 14 m and 16 m, respectively, is presented as the optimization for improving the ore recovery rate while maintaining a safe working environment. 展开更多
关键词 orthogonal design numerical simulation surface movement roof settlement stope stability room and pillarconfiguration
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Orthogonal experiment design of EMI of security monitoring system in coal mines 被引量:20
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作者 Xiang Liu Chaoqun Jiao Aifen Yao 《International Journal of Coal Science & Technology》 EI 2015年第4期325-332,共8页
Security monitoring system of coal mines is indispensable to ensure the safe and efficient production of colliery. Due to the special and narrow underground field of the coal mine, the electromagnetic interference can... Security monitoring system of coal mines is indispensable to ensure the safe and efficient production of colliery. Due to the special and narrow underground field of the coal mine, the electromagnetic interference can cause a series of misstatements and false positives on the monitoring system, which will severely hamper the safe production of coal industry. In this paper, first, the frequency characteristics of the interference source on the power line are extracted when equipment runs normally. Then the finite difference time domain method is introduced to analyze the effects of the electromagnetic interference parameters on the security monitoring signal line. And the interference voltage of the two terminal sides on the single line is taken as evaluating indexes. Finally, the electromagnetic interference parameters are optimized by orthogonal experimental design based on the MATLAB simulation on the normal operation of equipment. 展开更多
关键词 Security monitoring system Finite difference time domain method (FDTD) Electromagnetic interference(EMI) orthogonal experimental design
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Cavitation Optimization for a Centrifugal Pump Impeller by Using Orthogonal Design of Experiment 被引量:6
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作者 PEI Ji YIN Tingyun +2 位作者 YUAN Shouqi WANG Wenjie WANG Jiabin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2017年第1期103-109,共7页
Cavitation is one of the most important performance of centrifugal pumps. However, the current optimization works of centrifugal pump are mostly focusing on hydraulic efficiency only, which may result in poor cavitati... Cavitation is one of the most important performance of centrifugal pumps. However, the current optimization works of centrifugal pump are mostly focusing on hydraulic efficiency only, which may result in poor cavitation performance. Therefore, it is necessary to find an appropriate solution to improve cavitation performance with acceptable efficiency. In this paper, to improve the cavitation performance of a centrifugal pump with a vaned diffuser, the influence of impeller geometric parameters on the cavitation of the pump is investigated using the orthogonal design of experiment (DOE) based on computational fluid dynamics. The impeller inlet diameter D1, inlet incidence angle Aft, and blade wrap angle ~0 are selected as the main impeller geometric parameters and the orthogonal experiment of L9(3"3) is performed. Three-dimensional steady simulations for cavitation are conducted by using constant gas mass fraction model with second-order upwind, and the predicated cavitation performance is validated by laboratory experiment. The optimization results are obtained by the range analysis method to improve cavitation performance without obvious decreasing the efficiency of the centrifugal pump. The internal flow of the pump is analyzed in order to identify the flow behavior that can affect cavitation performance. The results show that D1 has the greatest influence on the pump cavitation and the final optimized impeller provides better flow distribution at blade leading edge. The final optimized impeller accomplishes better cavitation and hydraulic performance and the NPSHR decreases by 0.63m compared with the original one. The presented work supplies a feasible route in engineering practice to optimize a centrifugal pump impeller for better cavitation performance. 展开更多
关键词 cavitation optimization computational fluid dynamics orthogonal design of experiment range analysis
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Optimizing SSR-PCR system of Panax ginseng by orthogonal design 被引量:8
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作者 YANG Tian-tian MU Li-qiang WANG Jun 《Journal of Forestry Research》 SCIE CAS CSCD 2007年第1期31-34,共4页
An orthogonal design was used to optimize SSR-PCR amplification system using Panax ginseng genomic DNA as template. Four levels of five factors (DNA template, Taq DNA polymerase, Mg^2+, primer, and dNTP) and anneal... An orthogonal design was used to optimize SSR-PCR amplification system using Panax ginseng genomic DNA as template. Four levels of five factors (DNA template, Taq DNA polymerase, Mg^2+, primer, and dNTP) and annealing temperature have been tested separately in this system. The results demonstrated the reaction efficiency was affected by these factors. Based on the results, a stable, productive and reproducible PCR system and cycling program for amplifying a ginseng SSR locus were obtained: 20 μL system containing 1.0 U Taq DNA polymerase, 2.0 mmol·L^-1 Mg^2+, 0.2 mmol·L^-1 dNTPs, 0.3 μmol·L^-1 SSR primer, 60 ng· μla^-1 DNA template, performed with a program of 94℃ for 5 min, 94℃ for 30 s, annealing at 56.3℃ for 30 s, 72℃ for 1 min, 37 cycles, finishing at 72℃ for 7 min, and storing at 4℃. 展开更多
关键词 Panax ginseng C.A.Meyer orthogonal design SSR-PCR
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Application of orthogonal experimental design and Tikhonov regularization method for the identification of parameters in the casting solidification process 被引量:4
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作者 Dashan SUI Zhenshan CUI 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2009年第1期13-21,共9页
The inverse heat conduction method is one of methods to identify the casting simulation parameters. A new inverse method was presented according to the Tikhonov regularization theory. One appropriate regularized funct... The inverse heat conduction method is one of methods to identify the casting simulation parameters. A new inverse method was presented according to the Tikhonov regularization theory. One appropriate regularized functional was established, and the functional was solved by the sensitivity coefficient and Newtonaphson iteration method. Moreover, the orthogonal experimental design was used to estimate the appropriate initial value and variation domain of each variable to decrease the number of iteration and improve the identification accuracy and efficiency. It illustrated a detailed case of AlSiTMg sand mold casting and the temperature measurement experiment was done. The physical properties of sand mold and the interracial heat transfer coefficient were identified at the meantime. The results indicated that the new regularization method was efficient in overcoming the ill-posedness of the inverse heat conduction problem and improving the stability and accuracy of the solutions. 展开更多
关键词 orthogonal experimental design Regularization method Parameters identification Numerical simulation
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Influence of radial forging process on strain inhomogeneity of hollow gear shaft using finite element method and orthogonal design 被引量:3
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作者 LI Hong-xu WANG Kai +5 位作者 LUO Rong ZHU Zi-zong DENG Shuai LUO Rong ZHANG Jing-yi FANG Fei-song 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第6期1666-1677,共12页
Due to the current trend towards lightweight design in automotive industry,hollow stepped gear shafts for automobile and its radial forging process are widely investigated.Utilizing coupled finite element thermo-mecha... Due to the current trend towards lightweight design in automotive industry,hollow stepped gear shafts for automobile and its radial forging process are widely investigated.Utilizing coupled finite element thermo-mechanical model,radial forging process of a hollow stepped gear shaft for automobile was simulated.The optimal combination of three process parameters including initial temperature,rotation rate and radial reduction was also selected using orthogonal design method.To examine the strain inhomogeneity of the forging workpiece,the strain inhomogeneity factor was introduced.The results reveal that the maximum effective strain and the minimum effective strain appeared in the outermost and innermost zones of different cross sections for the hollow stepped gear shaft,respectively.Optimal forging parameters are determined as a combination of initial temperature of 780°C,rotation rate of 21°/stroke and radial reduction of 3 mm. 展开更多
关键词 radial forging process strain inhomogeneity orthogonal design coupled thermo-mechanical analysis finite element method
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Optimization by orthogonal array design of ion-pair HPLC separation of the enzymatic hydrolysis products of yeast RNA 被引量:3
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作者 Jie Hua Ke Long Huang 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第12期1453-1456,共4页
The separation of enzymatic hydrolysis products of yeast RNA by ion-pair HPLC was studied.A modified chromatographic response function(MCRF) was proposed to appraise the effectiveness of chromatographic separation.T... The separation of enzymatic hydrolysis products of yeast RNA by ion-pair HPLC was studied.A modified chromatographic response function(MCRF) was proposed to appraise the effectiveness of chromatographic separation.This function takes the number of peaks,resolution and the retention time of the last peak into consideration.It shows advantages for optimization of HPLC separation of complex mixtures.An orthogonal array design was used to separate the hydrolysate of yeast RNA and the optimal chromatographic conditions were obtained. 展开更多
关键词 Chromatographic response function orthogonal array design 5'-Phosphodiesterase Barley roots NUCLEOTIDES
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Mathematical model for abrasive suspension jet cutting based on orthogonal test design 被引量:5
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作者 胡贵华 朱文华 +5 位作者 蔡红霞 徐翀 柏余杰 程俊 苑进 俞涛 《Journal of Shanghai University(English Edition)》 CAS 2009年第1期37-44,共8页
This paper describes the application of orthogonal test design coupled with non-linear regression analysis to optimize abrasive suspension jet (AS J) cutting process and construct its cutting model. Orthogonal test ... This paper describes the application of orthogonal test design coupled with non-linear regression analysis to optimize abrasive suspension jet (AS J) cutting process and construct its cutting model. Orthogonal test design is applied to cutting stainless steel. Through range analysis on experiment results, the optimal process conditions for the cutting depth and the kerr ratio of the bottom width to the top width can be determined. In addition, the analysis of ranges and variances are all employed to identify various factors: traverse rate, working pressure, nozzle diameter, standoff distance which denote the importance order of the cutting parameters affecting cutting depth and the kerf ratio of the bottom width to the top width. ~rthermore, non-linear regression analysis is used to establish the mathematical models of the cutting parameters based on the cutting depth and the kerr ratio. Finally, the verification experiments of cutting parameters' effect on cutting performance, which show that optimized cutting parameters and cutting model can significantly improve the prediction of the cutting ability and quality of ASJ. 展开更多
关键词 abrasive suspension jet (AS J) orthogonal test design cutting depth the kerf ratio of the bottom width to the top width non-linear regression analysis verification experiment
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