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Статті в журналах з теми "658.3.07"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Shao, Ren Ping, Wei Wang, Jing Li, and Xin Na Huang. "Coupling Analysis on Dynamics and Tribology for Cycloid Transmission Used in Robot Joint." Advanced Materials Research 658 (January 2013): 305–10. http://dx.doi.org/10.4028/www.scientific.net/amr.658.305.

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A new scheme of high speed ratio cycloid transmission system used in robot joint is proposed. It has high transmission ratio that is 5 to 10 times larger than 2K-V type cycloid transmission when they has the same volume. The 3D model of the new transmission system is established and its motion condition is simulated, so it verifies the feasibility of the transmission scheme. Considering of the factors such as sliding friction between teeth, gear meshing stiffness and torsion stiffness of the shaft, an 18-degree-of-freedom dynamical model is established, and its dynamics is investigated, the dynamical response and dynamic loads of the new transmission system components considered friction are obtained. Compared with the results having no friction, it can be find that friction between the cycloid gear and the needle teeth impacts the vibration peak value of the new transmission elements in different degree. These provide a good foundation for the dynamical design and performance analysis of a robot.

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Xu, Hua Yang, Li Wen Guan, and Li Ping Wang. "The Statics and Dynamics Analysis of High-Dynamic Flight Simulator Based on Substructure Method." Advanced Materials Research 658 (January 2013): 327–34. http://dx.doi.org/10.4028/www.scientific.net/amr.658.327.

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In this paper, the most serious loads configuration of High-Dynamic Flight Simulator (HDFS) was found firstly by rigid-body dynamics analysis, then level-by-levelfinite element analyzing based on substructure method for HDFS under the configuration above was carried out, from which we got the statics characteristic of arm/gondola frame/gondola and the dynamics characteristic of the overall structure respectively. Such analysis strategy couples the stiffness matrix and mass matrix of lower-level structures to upper-level structures, and takes the deformation of upper-level as boundary condition for lower lever by displacement coordinate relationship between them, consequently, the accuracy of this strategy is reliable, and the computational efficiency is evidently improved. Analysis results show that the statics and dynamics characteristic of HDFS could be carried out by the level-by-level analyzing strategy effectively and soundly. This kind of analysis strategy is able to extend to other multi-level structures, such as flight simulator, centrifuge, multi-axis turntable et al.

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Siwadamrongpong, Somsak, Supakit Rooppakhun, Natchaya Murachai, and Pakorn Burakorn. "Strength Analysis of the Seat Anchorages for Large Passenger Vehicles Using Finite Element Method." Advanced Materials Research 658 (January 2013): 340–44. http://dx.doi.org/10.4028/www.scientific.net/amr.658.340.

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Since the vehicle accident is one of the major causes of dead and injury in Thailand, especially the large passenger vehicle. The seat anchorage was often damaged and lead to high number and critical of patient. To improve the safety of large passenger vehicle, seat anchorage should be investigated. The aim of this research was to analyze strength of seat anchorages for the bus according to European standard ECE Regulation 80 using finite element method and DOE(Design of Experimental) approach. In this study, the boundary conditions on finite element model of seat structure were defined according to the regulation. It is expected that the simulation techniques could be advantaged for seat anchorage analysis. This result will be used for further improvement of the bus seat anchorage design for safety and cost reduction in design processes.

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Kim, Tae Soo, Min Seung Kim, and Sung Woo Shin. "Block Shear Behaviors of Angle Two-Bolted Connections with Austenitic Stainless Steel – Experiment and Finite Element Analysis." Advanced Materials Research 658 (January 2013): 350–53. http://dx.doi.org/10.4028/www.scientific.net/amr.658.350.

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Since stainless steel has significant characteristics such as its superior corrosion resistance, durability, aesthetic appeal etc., it has been utilized as structural members in buildings. Recently, ultimate behaviors and curling influence in austenitic stainless steel single shear bolted connections with thin-walled plane plates have been investigated by T.S. Kim. In this paper, finite element analysis (FEA) has been conducted based on the existing test results of angle bolted connections in fabricated with austenitic stainless steel. The validation of the numerical analysis prediction was verified through the comparison of test results for fracture mode, ultimate strength and curling occurrence. Curling (out-of- plane deformation) also observed in the connections with a long end distance. The curling caused the ultimate strength reduction and the ultimate strength reduction ratios (varied from 12% to 25%) caused by curling have been estimated quantitatively through the comparison of FEA results of FE models with free edge and restrained curling.

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Lu, Yu Shan, and Hong Peng Liu. "Design and Fabrication of the Lubricating Dimple of the Headface Sliding Bearing with Phyllotactic Pattern." Advanced Materials Research 658 (January 2013): 367–71. http://dx.doi.org/10.4028/www.scientific.net/amr.658.367.

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In order to improve the lubricating performance of the headface sliding bearing, a new kind of the bionic headface sliding bearing, which has defined lubricating dimple pattern, has been designed based on the phyllotactic theory, and fabricated with UV lithography method and electrolytic technology. A electrolytic experiment of the dimple has been done and analyzed about the influence of the electrolytic time to the electrolytic depth against the different phyllotactic parameters. The analytical results indicate that the phyllotactic parameters influence the lubricating dimple arrangement configuration, so as to improve lubricating performance of the bearing. The increasing diameter of the dimple and the decreasing phyllotactic parameter c can increase the density of the lubricating dimple. Electrolytic experimental results show that the reasonable electrolytic fabricating can reduce the faults of defined lubricating dimple arrangement on the bearing surface.

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Wen, Li Zhi, Ming Feng Zheng, and Xin Jian Wang. "Finite Element Analysis of Piston under Mechanical Load." Advanced Materials Research 658 (January 2013): 380–83. http://dx.doi.org/10.4028/www.scientific.net/amr.658.380.

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In this paper, the model of the piston is founded by use of UG, and then joined in the ANSYS, applied the Multiphysics module and static structuer analysis function, we can count the stress field of the piston and accomplish the evaluate of the mechanical load.

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Zhang, Wei, Zhi Gang Guo, Xiao Dong Wang, Liang Dong An, and Hui Chen. "Research of Automotive Airbag Automatic Folding Device." Advanced Materials Research 658 (January 2013): 390–94. http://dx.doi.org/10.4028/www.scientific.net/amr.658.390.

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In order to improve the quality of folding and increase the production efficiency in the process of airbag folding，a new airbag automatic folding device（AAFD） with programmable logic controller(PLC) as control unit and magnetic induction sensors as well as photoelectric sensors as trace positional parameters of rolling bag institutions has been developed. In addition, the important data of the device can also be stored by structured query language (SQL) which can query, update, and manage relational database system. The experimental results showed that, compared to a traditional AFD, the uniformity of gap during the production of airbag folding had been significantly improved, and the impact of human interference had also been reduced. Meanwhile, the device can produce a variety of types of products and also can ensure the quality of products, improve the production efficiency, and enhance the degree of standardization of the device.

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Kim, Soo Ryong, Woo Teck Kwon, Byung Ik Kim, Y. Kim, and Sang Wook Ha. "Development of Non Explosive Insulating and Fire Proof Materials Using Porous Industrial Byproducts." Materials Science Forum 658 (July 2010): 300–303. http://dx.doi.org/10.4028/www.scientific.net/msf.658.300.

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The effectiveness of bottom ash on the mechanical and physical properties of lightweight cement mortar for fire proofing application is investigated in this study. Bottom ash is well known that it can make it possible to decrease the thermal conduction in mortar by their porous structure. Physical properties of bottom ash including pozzolanic activity and compressive strength test were measured to decide the replacement amount in formulation as well as chemical composition. This study was undertaken on the use of bottom ash as fine aggregate in fire proofing mortar. Various dosage of bottom ash such as 25%, 50%, 75%, 100% were evaluated by several measurement. We found out there were serious correlation between specific gravity and thermal conductivity, so other porous materials were also investigated to decrease the thermal conductivity of cement mortar as well as bottom ash. In this study, the researches on the mixing proportion were mainly performed to design specification of spraying fire proofing mortar. Based on the laboratory test results, we’d like to suggest the proper adding amount of bottom ash by evaluation of consistency and strength development and then optimum mixing proportions of spraying fire proofing mortar using bottom ash by various evaluations.

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Oh, Sea Cheon, Y. Kim, and Soo Ryong Kim. "Decomposition Characteristics of Wood Using Supercritical Methanol for Biodiesel Production." Materials Science Forum 658 (July 2010): 304–7. http://dx.doi.org/10.4028/www.scientific.net/msf.658.304.

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In this work, the decomposition characteristics of wood using supercritical methanol have been studied. The kinetic analysis was carried out for three heating rates of 5.2, 11.6 and 16.3 oC/min. And the liquid products analysis has been performed for reaction temperatures of 300-320 oC and reaction times of 0-120 min, respectively. The activation energies of wood decomposition in supercritical methanol were 45.2-48.8 kJ/mol, depending on the heating rates. And the reaction orders were 0.25 for all heating rates. And the liquid product has been analyzed by GC-MS. From this work, the yields of liquid product increased as increasing of reaction temperature and reaction time. And it was also found that the components of liquid products were mainly acetic acid, latic acid, pentanol and phenol.

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Sano, Hideaki, Guo Bin Zheng, and Yasuo Uchiyama. "Effect of SiC Particle Size on Anti-Oxidation Behavior of C/B₄C/SiC Composite." Materials Science Forum 658 (July 2010): 308–11. http://dx.doi.org/10.4028/www.scientific.net/msf.658.308.

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B4C and SiC particle-dispersed carbon composite were fabricated from calcined pitch coke, B4C and SiC with various particle size by grinding and then pressureless sintering. During non-isothermal oxidation test up to 1400°C in air atmosphere, oxidation behavior of the C/B4C/SiC composite was clarified by means of calculation of kinetic parameters using experimental data of mass change, gas formation of CO2, and oxygen gas consumption. Amount of the matrix carbon oxidized above 800°C in the composite with SiC particle of 0.4 µm and 0.9 µm in size was less than that in the composite with SiC particle of 50 nm and 1.8 µm in size. The oxidation of the matrix carbon was shown to depend upon the formation of B2O3 glass below 800°C oxidation, and that of SiO2 glass above 800°C. The composite containing SiC with 20 nm in size was stable against oxidation above 1400°C except the temperature ranging from 900°C to 1100°C.

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Ahn, Jae Hwan, Hyun Dong Lee, Seog Ku Kim, Pill Jae Kwak, and Joo Yeon Lee. "Corrosion Control of Drinking Water Copper Pipes by Corrosion Inhibitor." Materials Science Forum 658 (July 2010): 320–23. http://dx.doi.org/10.4028/www.scientific.net/msf.658.320.

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In case of cleaning the tap water in Korea, focus has been concentrated on how to improve water quality during the process of purification after taking in original water. However, the interest in human health has been increased, so 'secondary contamination' ,polluted in the process of crossing water reservoir, distributing pipes, indoor water tanks and water pipes after water left a filtration plant, is soared up as an important object of water quality control. Especially the copper pipe for the tap water, its characteristic was acknowledged as a pipe with many merits such as excellent corrosion resistance and easy assembly at the time to lay, is being frequently used in the advanced countries like East Europe, North America, Australia, etc, and is also being used as the material of pipe laying among the pipes for distributing water in Germany and Netherlands. But in case of Korea, the blue or green water problem is found even in the less than 6 year old copper pipes after being installed newly in indoor pipe laying for water distributing that causes to bring about aesthetic distrust to citizens, so the necessity of study is raised to control this situation. In this study tried to control the corrosion and the blue and green water problem happening in the copper pipe using corrosion inhibitors to settle down the various problems available to happen by this problem and suggested an optimized method to manage this situation.

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Zhu, Jian Feng, Guo Quan Qi, Fen Wang, and Hai Bo Yang. "High Purity Ti₂AlC Powder Prepared by a Novel Method." Materials Science Forum 658 (July 2010): 340–43. http://dx.doi.org/10.4028/www.scientific.net/msf.658.340.

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Ti2AlC powders with high purity were successfully synthesized via high energy milling and heat treatment of Ti, C and Al powders. The effects of composition and thermal treatment on the formation and purity of Ti2AlC were examined in detail. The results shown a mechanically induced self-propagating reaction (MSR) was triggered to form Ti3AlC2, TiC and TiAlx during the high energy milling. When the as-milled powders were heat treated, Ti2AlC was initially formed by the reaction between TiAl and TiC. With continuously increasing temperature, Ti2AlC was also produced by the reaction between TiAl and Ti3AlC2.

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Cho, Gue Serb, Jung Kyu Lim, Kyeong Hwan Choe, and Won Sik Lee. "Ni Nanoparticles Deposition onto CNTs by Electroless Plating." Materials Science Forum 658 (July 2010): 360–63. http://dx.doi.org/10.4028/www.scientific.net/msf.658.360.

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CNTs were decorated with Ni nanoparticles to decrease floatation of CNTs and improve the wettability between CNT and Al melt by electroless plating method. The as-received size of multi-wall CNTs with 99.5% purity was 10~20nm in diameter and 20um in length. Before Ni deposition, the wet ball milling was tried to improve the dispersion of CNTs in the Ni sulfate solution for several hours. After wet ball milling, the Ni electroless platings have been performed for 1hours at electroless deposition temperature. The Ni deposited CNTs have been characterized in respect of dispersion and size changes of CNTs and Ni particles with field emission scanning electron microscopy(FESEM). The deposited Ni nanoparticles onto the CNTs were 50nm in diameter without ball milling, but they increased in size with increasing milling times up to 120nm. Also, the milled CNTs were damaged and changed from its original morphology due to the high ball milling energy. The addition of surfactant improved the distribution and spheroidization of precipitated Ni nanoparticles. From this study, the multi-wall CNTs have been deposited and decorated with spherical Ni nanoparticles by electroless deposition at a proper milling time and surfactant addition.

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Han, Ying, De Ning Zou, Wei Zhang, Jun Hui Yu, and Yuan Yuan Qiao. "Influence of Sigma Phase Precipitation on Pitting Corrosion of 2507 Super-Duplex Stainless Steel." Materials Science Forum 658 (July 2010): 380–83. http://dx.doi.org/10.4028/www.scientific.net/msf.658.380.

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Specimens of 2507 super-duplex stainless steel aging at 850°C for 5 min, 15 min and 60 min were investigated to evaluate the pitting corrosion resistance in 3.5% NaCl solution at 30°C and 50°C. The results are correlated with the microstructures obtained with different aging time. The precipitation of σ phase remarkably decreases the pitting corrosion resistance of the steel and the specimen aged for 60 min presents the lowest pitting potential at both 30°C and 50°C. With increasing the ambient temperature from 30°C to 50°C, the pitting potential exhibits a reduction tendency, while this tendency is less obviously in enhancing the ambient temperature than in extending the isothermal aging duration from 5 to 60 min. SEM analysis shows that the surrounding regions of σ phase are the preferable sites for the formation of corrosion pits which grew up subsequently. This may be attributed to the lower content of corrosion resistance elements in these regions formatted with σ phase precipitation.

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Dumitrascu, Alina Corina, Gelu Ianus, and Dumitru Olaru. "Influence of the Contact Pressure on the Rolling Resistance Moments in Dry Ball-Race Contacts." Applied Mechanics and Materials 658 (October 2014): 305–10. http://dx.doi.org/10.4028/www.scientific.net/amm.658.305.

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Based on a theoretical model and an experimental methodology for defining the rolling resistance moments in a modified thrust ball bearing having only 3 balls, the authors experimentally investigated the influence of the Hertzian contact pressure on rolling resistance moments between a ball and a race. The experiments were realized with balls having diameters between 1.588 mm and 4.762 mm with maximum Hertzian pressure between 0.2GPa and 1GPa, operating for rotational speed between 60rpm to 210 rpm. The experiments evidenced that the measured values of the rolling resistance moments have higher values that the theoretical hysteresis and curvature rolling resistance moments for low contact pressure. By increasing of the contact pressure to 1GPa the experimental values for rolling resistance moments are in good agreement with the theoretical models.

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Gavrila, George, Spiridon Cretu, and Marcelin Benchea. "Wear Prediction in Wheel-Rail Contact under Partial Slip Conditions." Applied Mechanics and Materials 658 (October 2014): 317–22. http://dx.doi.org/10.4028/www.scientific.net/amm.658.317.

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This paper presents a numerical model to calculate wear during rolling contact due to micro-slip. Having as initial condition a corrugated rail it is shown the influence of the corrugation wavelength and the dynamic effects of the normal force on the wear creation. Experimental results are presented in order to reveal the influence of roughness when studying the stick-slip phenomenon.

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Puiu, Vasile. "Dependence between the Favourable Initial (Residual) Stresses and Durability of the Ball Screws." Applied Mechanics and Materials 658 (October 2014): 357–64. http://dx.doi.org/10.4028/www.scientific.net/amm.658.357.

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This work is based on theoretical and experimental researches on increasing the carrying capacity and durability of the ball screws used on machine tools by creating favourable initial compression stresses (non-conventional treatment) in the surface layer of the elements into contact, so that these stresses keep their effectiveness during usage.

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Sandu-Ville, Florin Tudose. "Jacq Effect Influence on Thermomechanical Contact Fatigue." Applied Mechanics and Materials 658 (October 2014): 377–80. http://dx.doi.org/10.4028/www.scientific.net/amm.658.377.

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The paper take into account the thermo – mechanical contact fatigue as an important component of global thermo – mechanical contact wear. This phenomenon is very important for contacts localized in enclosure, working non – stop, with few possibilities of intervention. It is presented in a synthetical way the theories concerning the location of the decisive stresses for mechanical rolling contact fatigue in connection with the primary crack in deterioration . Also, are made some considerations about the thermal effect Jacq and the consequences for the temperature gradient in a metallic wall. Most of the technological processes are carried out with heat release. An illustrated example is the rolling mill process where the thermal tide is at a high level. The reability evaluation for rolling mill rollers it is in connection with the position of the primary crack under the contact surface. This position give the type of the decisive stress for destruction. The importance of the paper is the connection between the thermal effect Jacq and the thermomechanical contact fatigue. Also, the influence of the changing slope for the temperature gradient concerning the position of the primary crack under the contact surface in thermomechanical contact fatigue [1].

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Wang, Qiang Song, Xiang Li, and Yuan Lu Cui. "The Anti-Inflammatory Effects of Tetrandrine-Loading Poly(L-Lactic Acid) Film In Vitro." Advanced Materials Research 658 (January 2013): 30–33. http://dx.doi.org/10.4028/www.scientific.net/amr.658.30.

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In the present study, the anti-inflammatory effects of tetrandrine-loading poly (L-lactic acid) (PLLA) films were investigated in vitro. The surface characteristics of blank PLLA film and tetrandrine-loading PLLA films were examined by electron spectroscopy for chemical analysis (ESCA). The ESCA data suggested that the tetrandrine-loading PLLA films became enriched with nitrogen atoms. The MTT assay was applied to evaluate the cytotoxicity of PLLA films with RAW264.7 cells. Production of nitric oxide (NO) was measured by the Griess colorimetric method. The gene expression levels of inducible nitric oxide synthase (iNOS) and IL-6 were detected by quantitative real-time reverse-transcription polymerase chain reaction (real-time RT-PCR). These results suggested that the anti-inflammatory effects of tetrandrine-loading PLLA films might be the results from modulating the NO/iNOS pathway and inhibiting the mRNA expression of iNOS and IL-6 in activated macrophages.

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Nakanishi, Ryosuke, Keiichi Inukai, Masaki Maeda, Masaya Suzuki, and Yutaka Tai. "Preferential Oxidation of CO over Pt Catalysts Supported on Mesoporous Aluminosilicates in the Presence of H₂." Materials Science Forum 658 (July 2010): 37–40. http://dx.doi.org/10.4028/www.scientific.net/msf.658.37.

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. Preferential oxidation (PROX) of CO in the presence of H2 is an important reaction to maintain stable operation of polymer electrolyte fuel cells (PEFCs) since their anode catalyst can be poisoned by trace amount of CO. In this study, we examined PROX reactions mediated by Pt catalysts prepared using several mesoporous silica and aluminosilicate supports such as imogolite (IM), allophane (AP), silica aerogel (SAG), and an amorphous hydroxyl aluminosilicate developed in our research group (HAS). The selectivity of CO oxidation gradually decreased from 80 to 60 % with increasing temperature from 323 to 473 K for Pt/HAS catalyst whereas it increased with temperature from 10 to 40 % for Pt/IM, Pt/AP, Pt/SAG catalysts. These results indicate that Pt supported on HAS may be effective for low-temperature PROX reactions.

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