Detection and Test of Rind-Pith Adhesive Strength of Corn Stalks

2021 ◽  
Vol 37 (1) ◽  
pp. 149-156
Author(s):  
Wanyuan Huang ◽  
Yuanjuan Gong ◽  
Xuewei Bai
Keyword(s):  
Mathematical Model ◽  
Moisture Content ◽  
Influencing Factors ◽  
Adhesive Strength ◽  
Sampling Location ◽  
List Type ◽  
Single Factor ◽  
Simulation And Optimization ◽  
Peeling Strength ◽  
The Mathematical Model

HighlightsA detection clamp for the rind-pith adhesive strength of corn stalks based on peeling method was designed.A rind-pith adhesive strength detection method was proposed taking average peeling strength as the test index.The characteristics of rind-pith adhesive strength were analyzed, and a mathematical model between average peeling strength and influencing factors was established.Abstract. Rind-pith separation of corn stalks is one of the effective measures for realizing high-value utilization of stalks. Therefore, it is necessary to study rind-pith adhesive strength of stalks and its influencing factors to determine effective separation methods. In this study, a peeling method was put forward and single factor and multi-factor tests were carried out to explore the rind-pith adhesive strength. The analysis of single factor tests showed that sampling location, moisture content, and peeling speed were all significant on the average rind-pith peeling strength and the Fp = 25.70 > F0.05 (4, 20) = 2.87, Fm = 112.46 > F0.05 (4, 20) = 2.87 and Fs = 231.21 > F0.05 (6, 28) = 2.45. The mathematical model between average peeling strength and influencing factors was established through multi-factor tests. The model was analyzed and optimized, and the significance sequence of influencing factors is sampling location > moisture content > peeling speed, and the effect of interaction between moisture content and sampling location was significant (P<0.05). It can be concluded that the rind-pith peeling strengths of internode sections among 1st-7th internodes of corn stalks were 360.09-450.01 N/m, which are smaller and more favorable for mechanical separation for stalks with moisture content of 15%-20% and at peeling speed of 30-40 mm/min. The results of this study may provide a theoretical reference for the modeling of corn stalks and the subsequent simulation and optimization of rind-pith separation machines. Keywords: Average peeling strength, Adhesive strength, Corn stalks, Rind-pith Separation.

Mathematical Modeling of Electrochemical Deburring

2010 ◽  
Vol 126-128 ◽  
pp. 545-550 ◽  
Author(s):  
Wen Ji Xu ◽  
W. Wang ◽  
Xu Yue Wang ◽  
Gui Bing Pang
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Influencing Factors ◽  
Applied Voltage ◽  
Experimental Results ◽  
Electrode Gap ◽  
Workpiece Material ◽  
Burr Height ◽  
Object A ◽  
The Mathematical Model

The drilling burr is taken as the research object. A mathematical model of electrochemical deburring (ECD) is established and the effects of main influencing factors, such as inter-electrode gap, applied voltage and deburring time, on burr height have been analyzed. The results show that the deburring time increases with the increase of initial burr height, inter-electrode gap, with the decrease of volume of electrochemical equivalent of the workpiece material, conductivity of electrolyte and applied voltage. The deburring time for various burr heights can be predicted by the mathematical model. The calculated results obtained from the mathematical model are approximately consistent with the experimental results. The results show that initial burr height h0=0.722mm is removed, and the fillet radius R=0.211mm is obtained.

Simulation and Optimization of Airframe Assembly Process

2018 ◽  
Author(s):  
Sergey Lupuleac ◽  
Nadezhda Zaitseva ◽  
Maria Stefanova ◽  
Sergey Berezin ◽  
Julia Shinder ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Statistical Analysis ◽  
Problem Solving ◽  
Contact Problem ◽  
Quality Measures ◽  
Assembly Process ◽  
Variation Analysis ◽  
Simulation And Optimization ◽  
The Mathematical Model ◽  
Variation Simulation

An approach for simulating the assembly process where compliant airframe parts are being joined by riveting is presented. The foundation of this approach is the mathematical model based on the reduction of the corresponding contact problem to a Quadratic Programming (QP) problem. The use of efficient QP algorithms enables mass contact problem solving on refined grids, which is needed for variation analysis and simulation as well as for the consequent assembly process optimization. To perform variation simulation, the initial gap between the parts is assumed to be stochastic and a cloud of such gaps is generated based on statistical analysis of the available measurements. The developed approach is illustrated with two examples, simulation of A350-900 wing-to-fuselage joining and optimization of A320 wing box assembly. New contact quality measures are discussed.

scholarly journals OPTIMIZATION OF SHEARING PARAMETERS OF CORN STALKS BASED ON DESIRABILITY FUNCTION APPROACH

2021 ◽  
pp. 355-364
Author(s):  
Wanyuan Huang ◽  
Shuo Qiu ◽  
Dezhi Ren ◽  
Yuanjuan Gong ◽  
Xuewei Bai ◽  
...  
Keyword(s):  
Moisture Content ◽  
Influencing Factors ◽  
Optimization Problem ◽  
Desirability Function ◽  
Function Approach ◽  
Sampling Location ◽  
Evaluation Indexes ◽  
Shearing Strength ◽  
Single Response ◽  
Desirability Function Approach

To determine the parameters of the whole corn stalks shearing, single factor and multi factor tests were carried out by using node and internode critical shearing strength as the evaluation indexes and the moisture content, sampling location and shearing speed as the influencing factors. The results showed that the moisture content, sampling location and shearing speed had significant effects on the critical shearing strength of internodes and nodes (F > F0.05), the order of the influencing factors on the internode and node critical shearing strength were: moisture content >sampling location >shearing speed and sampling location >moisture content >shearing speed. By using Design-Expert and Desirability Function Approach, the optimization problem of three response values, including difference value of critical shearing strength between node and internode at the same segment (DV), the node and internode critical shearing strength, was transformed into a single response value optimization. The corn stalks with a moisture content of 15% had lower shearing strength and higher shearing stability at the shearing speed of 25 mm/min.

Influencing Factors Analysis on Regulating Effect of the Pintle Controlled Thrust Regulating Mechanism

2010 ◽  
Vol 44-47 ◽  
pp. 1320-1324
Author(s):  
Lan Ting Zhang ◽  
Hai Qing Cheng ◽  
Li Ming Song ◽  
Jin Shun Yan
Keyword(s):  
Mathematical Model ◽  
Influencing Factors ◽  
Theoretical Foundation ◽  
Rocket Engine ◽  
Structure Design ◽  
Factors Analysis ◽  
Main Factors ◽  
Solid Rocket ◽  
And Control ◽  
The Mathematical Model

Based on the thrust regulating principle of pintle controlled solid-rocket engine, the mathematical model between pintle motion and thrust changing is established, and influence of main factors to thrust regulating effect is analyzed. These results can provide theoretical foundation for structure design and control of pintle controlled thrust regulating mechanism of solid-rocket engine.

Life Prediction of Bearings Based on Fuzzy Theory

2010 ◽  
Vol 455 ◽  
pp. 422-426 ◽  
Author(s):  
X.Q. Wang ◽  
F.K. Cui ◽  
G.B. Wang
Keyword(s):  
Mathematical Model ◽  
Case Studies ◽  
Influencing Factors ◽  
Life Prediction ◽  
Fuzzy Theory ◽  
Membership Degree ◽  
Fuzzy Reliability ◽  
Calculation Results ◽  
The Mathematical Model ◽  
Full Consideration

Based on the fuzzy theory and universal calculation equations, the mathematical model is established for predicting life of a bearing by analyzing various factors. And the fuzzy reliability life can be calculated according to the model. The case studies show that for the proposed method takes full consideration of all the influencing factors and their function of membership degree, the calculation results are very close to the actual ones.

Approbation of the Mathematical Model of Adhesive Strength with Viscoelasticity

2019 ◽  
Vol 816 ◽  
pp. 96-101
Author(s):  
Stepan V. Litvinov ◽  
Xuan Zhen Song ◽  
Serdar B. Yazyev ◽  
Artur Avakov
Keyword(s):  
Mathematical Model ◽  
Adhesive Strength ◽  
Adhesive Joint ◽  
Epoxy Resins ◽  
Polymeric Materials ◽  
Critical Value ◽  
Structural Elements ◽  
Long Period ◽  
Tangential Stresses ◽  
The Mathematical Model

Expressed viscoelasticity of polymeric materials which can develop over a long period of time prevents their widespread. Some types of polymers, such as epoxy resins, can be used to connect various structural elements. The destruction in this case can be caused by the growth of tangential stresses in the adhesive joint and their achievement of some critical value τadhezive, at which the adhesive joint is destroyed.

The Design of Moisture Content of Lubricating Oil Detecting System Based on AD5933

2013 ◽  
Vol 401-403 ◽  
pp. 1129-1134
Author(s):  
Qiang Liao ◽  
Wei Dong Fan ◽  
Jiang Wu ◽  
Tao Xu
Keyword(s):  
Mathematical Model ◽  
Moisture Content ◽  
Water Content ◽  
Capacitive Sensor ◽  
Lubricating Oil ◽  
Voltage Amplitude ◽  
Excitation Voltage ◽  
The Mathematical Model ◽  
The Relationship ◽  
Resistance Value

In order to detect lubricating oil moisture content quickly, and replace lubricating oil of equipment in time , impedance type moisture content of lubricating oil detecting system based on AD5933 and cylindrical coaxial capacitive sensor are explored. The paper selected the excitation voltage amplitude and frequency reasonably, and studied the relationship between water content of lubricating oil and impedance value. The result suggests that when the excitation voltage amplitude is 2V, the frequency ranges from 4 kHz to 6 kHz, moisture content of lubricating oil is closely related to impedance value and lubricating oil resistance value decreases with the increase of its moisture content. In addition, the mathematical model between moisture content of lubricating oil and the impedance value is established, moisture content of lubricating oil can be calculated according to the impedance value.

MODELLING THE OZONE PENETRATION IN A GRAIN LAYER / OZONO SKVERBTIES GRŪDŲ SLUOKSNYJE MODELIAVIMAS

2012 ◽  
Vol 20 (4) ◽  
pp. 292-300 ◽  
Author(s):  
Aušra Steponavičienė ◽  
Dainius Steponavičius ◽  
Algirdas Raila ◽  
Aurelija Kemzūraitė
Keyword(s):  
Mathematical Model ◽  
Moisture Content ◽  
Initial Concentration ◽  
Real Process ◽  
Grain Moisture ◽  
Grain Drying ◽  
Ozonation Time ◽  
Grain Surface ◽  
The Mathematical Model ◽  
Ozonation Process

Studies of grain drying with ozone-air mixture were carried out to detect the ozone penetration patterns through the grain mound of various moisture content (14.6 ≤ w 0 ≤ 23.0%) at different ozone concentrations (500 ≤ C 0 ≤ 1250 ppb) in the supplied air. The ozone penetration through the grain layer depends on the initial ozone concentration in the supplied air, ozonation time, velocity of the supplied air, height of the grain mound, initial grain moisture content and mycobiotic contamination of grain surface. It was determined that in a 60 cm height of the grain layer ozone is first recorded after 12 h, and at 105 cm – only after 34 h at w 0 = 19.0%, C 0 = 500 ppb. If the initial concentration of ozone is higher, it is first recorded sooner. Ozone penetration through the grain layer with higher moisture level is slower, and ozone reaction with grain surface and microflora present on it is longer. Hypothesis about the adequacy of the model (how it reflects the real process) has been verified by calculating reproduction and adequacy variance. The mathematical model could be applied for prediction of the course of grain ozonation process. Santrauka Grūdų džiovinimo ozono ir oro mišiniu tyrimai atlikti siekiant išaiškinti ozono skverbties per skirtingo drėgnio grūdų sampilą dėsningumus (14,6 ≤ w 0 ≤ 23,0%), esant skirtingoms ozono koncentracijoms (500 ≤ C 0 ≤ 1250 ppb) tiekiamame ore. Ozono skverbtis grūdų sluoksnyje priklauso nuo pradinės ozono koncentracijos tiekiamame ore, ozonavimo trukmės, tiekiamo oro greičio, grūdų sampilo aukščio, pradinio grūdų drėgnio ir jų paviršiaus mikobiotinio užterštumo. 60 cm grūdų sluoksnio aukštyje ozonas pradėtas fiksuoti po 12 h, o 105 cm – tik po 34 h, kai w 0 = 19,0%, C 0 = 500 ppb. Padidinus pradinę ozono koncentraciją, ozonas pradedamas fiksuoti greičiau. Ozonuojant drėgnesnius grūdus, ozonas per jų sluoksnį skverbiasi lėčiau, vyksta ilgesnė jo reakcija su grūdų paviršiumi ir ant jų esančia mikroflora. Hipotezė apie modelio adekvatumą (kaip jis atspindi realų procesą) buvo patikrinta apskaičiavus reprodukcijos ir adekvatumo dispersijas. Sudarytas matematinis modelis gali būti taikomas grūdų ozonavimo procesui prognozuoti.

Function Area Layout Method of Underground Distribution Center

2011 ◽  
Vol 48-49 ◽  
pp. 547-550
Author(s):  
Cheng Lin Ma ◽  
Hai Jun Mao
Keyword(s):  
Mathematical Model ◽  
Programming Model ◽  
Exact Algorithm ◽  
Distribution Center ◽  
Mixed Integer ◽  
Simulation Platform ◽  
Logistics System ◽  
Layout Planning ◽  
Simulation And Optimization ◽  
The Mathematical Model

Function area layout of underground distribution center is an important part of urban underground distribution center planning so that it would indirectly affect the building and development of underground distribution center and even the whole urban underground logistics system. Based on Automod simulation platform, the function area layout planning method was built in order to avoid underground operation invalidation because of the illogical function area layout. First by analyzing relative operation of underground distribution center, multi-objective 0-1 mixed integer programming model of function area layout was built based on two indexes of relativity and transit cost among function areas. Then the heuristic algorithm or exact algorithm was used to solve the mathematical model mathematical model and find out the layout scheme after quantifying the indicators. Finally the final layout was gained by simulation and optimization of Automod simulation platform. There was an example for proving the feasibility of the method. The results showed that the method was available to analyze the function area layout impact and it was very important for decision-making of building the underground distribution center.

scholarly journals Mathematical model for assessing the high-rise apartment buildings complex quality

2019 ◽  
Vol 91 ◽  
pp. 02025 ◽  
Author(s):  
Azariy Lapidus ◽  
Yana Shesterikova
Keyword(s):  
Mathematical Model ◽  
Influencing Factors ◽  
Quality Index ◽  
Construction Project ◽  
Factor Matrix ◽  
High Rise ◽  
Apartment Buildings ◽  
The Mathematical Model

With use of factor matrix, four groups of parameters were identified, and one group was determined as the most significant one, which affects the complex quality index in high-rise apartment buildings constriction. The dependence between the complex quality index and the values of influencing factors was determined. The mathematical model that allows making adjustments to achieve the required levels of quality at all stages of the construction project was considered.

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