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Online since: March 2015
Authors: Li Hua Zhang, Ling Lin Zhang, Min Zeng, Bo Wang
Results show that the influence of 3 factors on the comprehensive evaluation: The slice thickness > Microwave power > The pulse ratio.
Microwave heating won't produce harmful substances and does not affect the quality of food, so it will not cause ecological damage.
The drying process will select index and determine the factors and level of factors, so apply RSM studying factor interactions on ginger intermittent microwave drying process, the drying characteristics of ginger in the intermittent microwave drying conditions and explore the influence of different factors on the drying rate, energy consumption and Chromatic aberration.
The experimental values and theoretical values are consistent and the reliability and rationality of the model are proved. 3) RSM directly analyzes the influence factors of the interaction term and obtains that the interaction of slice thickness and microwave power has significant effect on the comprehensive index, but other interaction factors not.
Effects of microwave drying on the aging properties of vulcanized natural rubber of hot oxygen "[J]."
Microwave heating won't produce harmful substances and does not affect the quality of food, so it will not cause ecological damage.
The drying process will select index and determine the factors and level of factors, so apply RSM studying factor interactions on ginger intermittent microwave drying process, the drying characteristics of ginger in the intermittent microwave drying conditions and explore the influence of different factors on the drying rate, energy consumption and Chromatic aberration.
The experimental values and theoretical values are consistent and the reliability and rationality of the model are proved. 3) RSM directly analyzes the influence factors of the interaction term and obtains that the interaction of slice thickness and microwave power has significant effect on the comprehensive index, but other interaction factors not.
Effects of microwave drying on the aging properties of vulcanized natural rubber of hot oxygen "[J]."
Online since: March 2024
Authors: Papot Jaroenapibal, Komsak Harachai, Premchai Moolla, Nujira Kothanamn, Chatpawee Hom On, Jirapan Srimaneerat, Panya Wintachai
To investigate the effects of electrodeposition current density on the properties of the Ni-P/diamond composite coating, scanning electron microscopy (SEM), hardness testing, and electrochemical testing were employed.
Electrodeposited composites based on Ni-P alloys with different solid particles are promising as protective coatings due to their outstanding corrosion and wear resistance properties.
The incorporation of diamond particles in Ni-P deposits has been shown to significantly improve properties such as hardness, corrosion, and wear resistance of the coatings [19,20].
The graph was plotted to display the factors that may independently contribute to the coating hardness.
It has been hypothesized that some competing forces are at work during the co-electrodeposition process that may affect the thickness and diamond content of the coating.
Electrodeposited composites based on Ni-P alloys with different solid particles are promising as protective coatings due to their outstanding corrosion and wear resistance properties.
The incorporation of diamond particles in Ni-P deposits has been shown to significantly improve properties such as hardness, corrosion, and wear resistance of the coatings [19,20].
The graph was plotted to display the factors that may independently contribute to the coating hardness.
It has been hypothesized that some competing forces are at work during the co-electrodeposition process that may affect the thickness and diamond content of the coating.
Online since: October 2011
Authors: Othman Mamat, Adibah Amir
It is worthy to note that, principal tribological parameters that control the friction and wear performance of these particle reinforced composites greatly depend on various factors such as nature, shape, size, hardness , volume fraction and distribution of particles, properties of matrix alloy, and bonding between matrix and particles [27, 28].
This improvement in mechanical properties as well as the microstructure was attributed by silica sand nanoparticles diffused in the porous sites of composites.
type of filler and its sliding partner is a significant factor in determining good tribological properties.
Recommended volume concentration of 10-20 percent for optimum results in mechanical properties as well as tribological properties.
Li, “Mechanical, electrochemical and tribological properties of nano-crystalline surface of 304 stainless steel”, Journal of Wear, 255 (2003) 836-845 [31] International Powder Metallurgy Directory, http://www.ipmd.net.
This improvement in mechanical properties as well as the microstructure was attributed by silica sand nanoparticles diffused in the porous sites of composites.
type of filler and its sliding partner is a significant factor in determining good tribological properties.
Recommended volume concentration of 10-20 percent for optimum results in mechanical properties as well as tribological properties.
Li, “Mechanical, electrochemical and tribological properties of nano-crystalline surface of 304 stainless steel”, Journal of Wear, 255 (2003) 836-845 [31] International Powder Metallurgy Directory, http://www.ipmd.net.
Online since: December 2011
Authors: Yu Hua Chen, Quan Ni, Li Ming Ke, Wei Huai Gong
However, there are many process factors needed to control when using the transistor welding power and reliable welded joint demanding special process, especially with the welding of coating and dissimilar materials which because of their properties varied widely and the coating metal may participate in the metallurgical reaction of nugget.
Table .1 Factor level of orthogonal experiment Level No Factor A Preheat current/KA B Welding current/KA C Tardy rise time/ms D Preheat time/ms E Cool time/ms F Welding time/ms G Electrode pressure/N 1 0.4 2.3 0.5 2 1 5 20 2 0.6 2.9 0.4 1.5 0.5 3.5 45 3 0.8 3.5 0.3 1 0 2 68 In table 2, the important order of the factors that affect the conversion are welding current, electrode pressure, welding time, preheating current, tardy rise time, preheating time, cool time in turn.
The Influence of Factors on Welding Joint’s Tension Shear Force.
The influence of level change of factors on experimental index is also different.
[4] Resistance welding speciality committee(Ⅲ) of welding society in Chinese mechanical engineeringsociety.
Table .1 Factor level of orthogonal experiment Level No Factor A Preheat current/KA B Welding current/KA C Tardy rise time/ms D Preheat time/ms E Cool time/ms F Welding time/ms G Electrode pressure/N 1 0.4 2.3 0.5 2 1 5 20 2 0.6 2.9 0.4 1.5 0.5 3.5 45 3 0.8 3.5 0.3 1 0 2 68 In table 2, the important order of the factors that affect the conversion are welding current, electrode pressure, welding time, preheating current, tardy rise time, preheating time, cool time in turn.
The Influence of Factors on Welding Joint’s Tension Shear Force.
The influence of level change of factors on experimental index is also different.
[4] Resistance welding speciality committee(Ⅲ) of welding society in Chinese mechanical engineeringsociety.
Online since: May 2019
Authors: Jessalyn C. Grumo, Lady Jaharah Jabber Bulayog, Arnold C. Alguno, Arnold A. Lubguban, Rey Capangpangan
Moreover, these bio-based polyols exhibit high thermal stability, good elasticity and improved hydrolytic properties in the produced RPUF [8].
It is believed that blowing agent is of paramount importance especially in the formation of RPUF, affecting important properties such as thermal conductivity and mechanical strength.
[4] Kun Hyung Choe, Dong Soo Lee, Won Jin Seo, and Woo Nyon Kim, “Properties of Rigid Polyurethane Foams with blowing agents and Catalysts”
“Physical properties of polyurethanes produced from polyols from seed oils: II.
“Factors contributing to k-factor optimization with ecomate blown foams”, Foam Supplies, Inc. 4387 N.
It is believed that blowing agent is of paramount importance especially in the formation of RPUF, affecting important properties such as thermal conductivity and mechanical strength.
[4] Kun Hyung Choe, Dong Soo Lee, Won Jin Seo, and Woo Nyon Kim, “Properties of Rigid Polyurethane Foams with blowing agents and Catalysts”
“Physical properties of polyurethanes produced from polyols from seed oils: II.
“Factors contributing to k-factor optimization with ecomate blown foams”, Foam Supplies, Inc. 4387 N.
Online since: July 2011
Authors: Zi Tang Yu, Yong Ming He, Li Jiao Pan
Application of Computer Simulation Technology in the Analysis for Gilling Machine Structure
Lijiao Pan1,a, Zitang Yu1,Yongming He1
1 Yiwu Industrial and Commercial College, School of Electro-mechanical and Information Technology, Yiwu, 322000, China;
apanlijiao216@163.com
Keywords: Computer simulation technology, Gilling machine, Prestress, Modal analysis
Abstract.
It provides some suggestions that can be used to research the effect factors of gilling machine design, the gilling machine structure optimization and operating mode control.
The computer simulation technology can not only employ to analyze product structure and thermo-physical accurately, and provide some visual simulation results, but also can optimize structure parameters and the structure properties by simulation software.
So working-screw is one of main working parts, its dynamic-state and static-state characteristics affect the performance of the whole machine, and the structure dynamics analysis and static mechanics analysis are very necessary.
Hence it is necessary to deal with the assembly without affecting the analysis.
It provides some suggestions that can be used to research the effect factors of gilling machine design, the gilling machine structure optimization and operating mode control.
The computer simulation technology can not only employ to analyze product structure and thermo-physical accurately, and provide some visual simulation results, but also can optimize structure parameters and the structure properties by simulation software.
So working-screw is one of main working parts, its dynamic-state and static-state characteristics affect the performance of the whole machine, and the structure dynamics analysis and static mechanics analysis are very necessary.
Hence it is necessary to deal with the assembly without affecting the analysis.
Online since: December 2012
Authors: Yin Zhi He, Zhi Gang Yang, Chen Zhang
Modal is the natural vibration characteristics of mechanical structure.
Here for the metal plate, thickness is set as 1.5mm. 3) Defining material characteristics Material characteristics can affect modal analysis results to a great degree.
Here for the metal plate direct method is used to create geometric model with dimension of 160mm×240mm. 5) Setting up finite element model mesh Three steps are needed to set up the finite element model mesh after entity modelling: The first step is to assign element data, including element type, geometric parameters, physical properties and local coordinate system.
Therefore, boundary condition is one of the key factors for structure modal analysis.
[5] Benwen Xu:Basis of mechanical vibration and modal analysis(China Machine Press 1998)
Here for the metal plate, thickness is set as 1.5mm. 3) Defining material characteristics Material characteristics can affect modal analysis results to a great degree.
Here for the metal plate direct method is used to create geometric model with dimension of 160mm×240mm. 5) Setting up finite element model mesh Three steps are needed to set up the finite element model mesh after entity modelling: The first step is to assign element data, including element type, geometric parameters, physical properties and local coordinate system.
Therefore, boundary condition is one of the key factors for structure modal analysis.
[5] Benwen Xu:Basis of mechanical vibration and modal analysis(China Machine Press 1998)
Online since: October 2011
Authors: A. Sarkar, U. Ray, S. Sen, B. Roychowdhury, N. Barman
Introduction
The thixocasting process is a novel manufacturing technique to produce near net shape components with good mechanical and metallurgical properties.
However, the evolution of latent heat during melting affects the temperature distribution significantly.
The thermo-physical properties of the billet material used in simulation are summarized in Table 1.
Thermophysical properties and system data Properties Value Density (r) 2550 Kg/m3 (solid) 2390 Kg/m3 (liquid) Specific Heat (cp) 1170W/m2-oC (solid) 1070W/m2-oC (liquid) Thermal Conductivity (k) 120 W/m-K Absolute Permeability, 4p x 10-7 Relative Permeability, 1 Specific Resistance (rm ) 2.62 x 10-8 Ω-m System Data Billet Radius (Rb) 45 mm Billet Length (L) 50 mm Heating Coil Diameter ( d) 5 mm Heat Transfer Coefficient (h) 30 W/m2-K Calculation of the Source Terms.
The thermo-physical properties and system data used in the simulation are taken from the Table I.
However, the evolution of latent heat during melting affects the temperature distribution significantly.
The thermo-physical properties of the billet material used in simulation are summarized in Table 1.
Thermophysical properties and system data Properties Value Density (r) 2550 Kg/m3 (solid) 2390 Kg/m3 (liquid) Specific Heat (cp) 1170W/m2-oC (solid) 1070W/m2-oC (liquid) Thermal Conductivity (k) 120 W/m-K Absolute Permeability, 4p x 10-7 Relative Permeability, 1 Specific Resistance (rm ) 2.62 x 10-8 Ω-m System Data Billet Radius (Rb) 45 mm Billet Length (L) 50 mm Heating Coil Diameter ( d) 5 mm Heat Transfer Coefficient (h) 30 W/m2-K Calculation of the Source Terms.
The thermo-physical properties and system data used in the simulation are taken from the Table I.
Online since: July 2015
Authors: Xing Hui Yang, Yong Kun Wang, Wen Rui Duan, Hong Yang Chen, Zi Li Kou, Duan Wei He
This paper aims to study the sintering process and mechanical properties of submicron polycrystalline diamond (SMPD) without any secondary phases and binder materials under pressure of 7-8 GPa and 1400 ℃-1800 ℃, using the bi-layer assembly and the conventional assembly methods.
The graphitization of diamond was found to be an important factor determining the hardness of samples sintered using the bi-layer assembly.
However, the sintered body of polycrystalline diamond (PCD), consisting of small diamond grains orienting in random directions, may have higher toughness and more isotropic mechanical properties than the single crystal diamond.
Various additives can fill intergrain pores in the compression of diamond powders and promote to bind among adjacent diamond grains employing the process 2, while they can also substantially affect the mechanical properties, oxidation resistance, etc.
Unfortunately, the study of properties of submicron diamond sintered samples such as sintering mechanism, microstructure, mechanical properties, cutting performance and so on have not yet been detailed reported.
The graphitization of diamond was found to be an important factor determining the hardness of samples sintered using the bi-layer assembly.
However, the sintered body of polycrystalline diamond (PCD), consisting of small diamond grains orienting in random directions, may have higher toughness and more isotropic mechanical properties than the single crystal diamond.
Various additives can fill intergrain pores in the compression of diamond powders and promote to bind among adjacent diamond grains employing the process 2, while they can also substantially affect the mechanical properties, oxidation resistance, etc.
Unfortunately, the study of properties of submicron diamond sintered samples such as sintering mechanism, microstructure, mechanical properties, cutting performance and so on have not yet been detailed reported.
Online since: April 2019
Authors: Ismayadi Ismail, Mamat Md. Shuhazly, Ibrahim Nur Izzaiti, Adnan Noor Lyana
Introduction
Carbon nanotubes has been widely known to own unique properties such as good mechanical strength and high conductivity.
Since then, this materials become attraction due low density properties but exceptional thermal properties [1].
For CNT films and fibers in macroscale, their mechanical strength and electrical properties is decreasing tremendously compared to nanoscale.
The design of the reactor also plays an important role in the synthesis process as it involves thermopherosis and residence time affecting the growth of CNT film.
Sun, Effective enhancement of the mechanical properties of macroscopic single-walled carbon nanotube fibers by pressure treatment.
Since then, this materials become attraction due low density properties but exceptional thermal properties [1].
For CNT films and fibers in macroscale, their mechanical strength and electrical properties is decreasing tremendously compared to nanoscale.
The design of the reactor also plays an important role in the synthesis process as it involves thermopherosis and residence time affecting the growth of CNT film.
Sun, Effective enhancement of the mechanical properties of macroscopic single-walled carbon nanotube fibers by pressure treatment.