Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010826
Hao Yajuan, Shi Yunhui, Ping Panpan
A theoretical algorithm by united Lagrangian-Eulerian method for the problem in dealing with viscous fluid and a circular cylindrical shell is presented. In this approach, each material is described in its preferred reference frame. Fluid flows are given in Eulerian coordinates whereas the elastic circular cylindrical shell is treated in a Lagrangian framework. The fluid velocity in a two-dimensional uniform elastic circular cylindrical shell filled with viscous fluid is studied under the assumption of low Reynolds number. The coupling between the viscous fluid and the elastic circular cylindrical shell is kinematic conditions at the shell surface. Also, the radial velocity and axial velocity of the fluid are discussed with the help of graphs.
{"title":"Theoretical Study on Fluid Velocity for Viscous Fluid in a CircularCylindrical Shell","authors":"Hao Yajuan, Shi Yunhui, Ping Panpan","doi":"10.2174/1874155X01509010826","DOIUrl":"https://doi.org/10.2174/1874155X01509010826","url":null,"abstract":"A theoretical algorithm by united Lagrangian-Eulerian method for the problem in dealing with viscous fluid and a circular cylindrical shell is presented. In this approach, each material is described in its preferred reference frame. Fluid flows are given in Eulerian coordinates whereas the elastic circular cylindrical shell is treated in a Lagrangian framework. The fluid velocity in a two-dimensional uniform elastic circular cylindrical shell filled with viscous fluid is studied under the assumption of low Reynolds number. The coupling between the viscous fluid and the elastic circular cylindrical shell is kinematic conditions at the shell surface. Also, the radial velocity and axial velocity of the fluid are discussed with the help of graphs.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127903486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010846
Di Wu, Jin Yao, Hua Li
In order to improve the validity and accuracy of fault diagnosis on mechanical equipment, this study applies fuzzy nearness approach by adjusting the traditional formulations. Besides, it points out the disadvantages in fault diagnosis of traditional nearness approach based on experimental data of gear transmission. A fuzzy nearness function- based model is constructed to execute the fault diagnosis with the assistance of fuzzy nearness principles and fuzzy mathematical membership degree. Following that, a experimental data-based numerical example is implemented, which demonstrates that the adjusted fuzzy nearness approach performs better than the traditional one in diagnosing gear fault effectively and meeting the practical requirements of gear transmission fault diagnosis.
{"title":"Fault Diagnosis of Gear Based on the Variable Fuzzy Similarity Nearness","authors":"Di Wu, Jin Yao, Hua Li","doi":"10.2174/1874155X01509010846","DOIUrl":"https://doi.org/10.2174/1874155X01509010846","url":null,"abstract":"In order to improve the validity and accuracy of fault diagnosis on mechanical equipment, this study applies fuzzy nearness approach by adjusting the traditional formulations. Besides, it points out the disadvantages in fault diagnosis of traditional nearness approach based on experimental data of gear transmission. A fuzzy nearness function- based model is constructed to execute the fault diagnosis with the assistance of fuzzy nearness principles and fuzzy mathematical membership degree. Following that, a experimental data-based numerical example is implemented, which demonstrates that the adjusted fuzzy nearness approach performs better than the traditional one in diagnosing gear fault effectively and meeting the practical requirements of gear transmission fault diagnosis.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128086673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010791
Song Liu
In this paper, we introduce the production of ductile iron crankshaft of the engine status quo and development. Ductile iron crankshaft discussed smelting process, alloying and manufacturing process mode. This paper focuses on the application of isothermal hardened spheroidal graphite cast iron in the crankshaft, especially its application in the power of the engine crankshaft. We also introduce a way for casting production technique of high strength-high toughness nodular iron crankshaft. In order to increase the strength, toughness of the nodular iron crankshaft and improve casting quality, a series of investigations were carried out on the mini-amount alloying technique, control technique of iron melt eutectic point, nodularizing treating technique, curved parting method and the structure normalization process and, as the result, the high-strength and high toughness nodular iron crankshaft was successfully developed. The tensile strength of the crankshaft was increased from original 872 MPa to 927 MPa.
{"title":"Foundry and Development of Ductile Iron Crankshaft","authors":"Song Liu","doi":"10.2174/1874155X01509010791","DOIUrl":"https://doi.org/10.2174/1874155X01509010791","url":null,"abstract":"In this paper, we introduce the production of ductile iron crankshaft of the engine status quo and development. Ductile iron crankshaft discussed smelting process, alloying and manufacturing process mode. This paper focuses on the application of isothermal hardened spheroidal graphite cast iron in the crankshaft, especially its application in the power of the engine crankshaft. We also introduce a way for casting production technique of high strength-high toughness nodular iron crankshaft. In order to increase the strength, toughness of the nodular iron crankshaft and improve casting quality, a series of investigations were carried out on the mini-amount alloying technique, control technique of iron melt eutectic point, nodularizing treating technique, curved parting method and the structure normalization process and, as the result, the high-strength and high toughness nodular iron crankshaft was successfully developed. The tensile strength of the crankshaft was increased from original 872 MPa to 927 MPa.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130482166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010910
Lijun Xu, Lei Xu, Lei Zhang, K. Yang
large-scaled blade has posed many problems related to design and production. After introducing the features of blade with thick airfoils and flatback, based on relevant parameters of Huaren 100 kW wind turbine, the paper designed blade with thick airfoils and flatback, introduced blade parameter design, and analyzed the aerodynamic performance of blades using GH bladed software, obtaining the relationship between power output of wind turbine with blade tip speed ratio Cp. Furthermore, it analyzed the aerodynamic performance of original design blades, modified blades and Huaren 100 kW blades, and assessed the aerodynamic performance of modified blade.
{"title":"Design of Wind Turbine Blade with Thick Airfoils and Flatback and its Aerodynamic Characteristic","authors":"Lijun Xu, Lei Xu, Lei Zhang, K. Yang","doi":"10.2174/1874155X01509010910","DOIUrl":"https://doi.org/10.2174/1874155X01509010910","url":null,"abstract":"large-scaled blade has posed many problems related to design and production. After introducing the features of blade with thick airfoils and flatback, based on relevant parameters of Huaren 100 kW wind turbine, the paper designed blade with thick airfoils and flatback, introduced blade parameter design, and analyzed the aerodynamic performance of blades using GH bladed software, obtaining the relationship between power output of wind turbine with blade tip speed ratio Cp. Furthermore, it analyzed the aerodynamic performance of original design blades, modified blades and Huaren 100 kW blades, and assessed the aerodynamic performance of modified blade.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132106005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509011000
Xin Yaju, Zhao Xuya, Liu Xiaoman, Tie Rui, Chen Shuliang
In order to realize the functional integration, a new kind of sandwich panel was made. By carrying out quasi- static shear experiments, its elastic modulus and ultimate bearing capacity with different resin immersing thickness, thickness of additional layers of resin and thickness were investigated. And the load - displacement curves and failure morphology were obtained, which was compared with traditional aluminum honeycomb sandwich panel. The experiments indicate that the integrated aluminum honeycomb and epoxy resin sandwich panel's shearing process undergo three phases: elasticity, yield and destruction. The specimen's elastic modulus and ultimate bearing capacity increase with the increasing of the resin thickness, thickness of additional layers of resin and the thickness of the specimen, which have been greatly improved compared to the traditional sandwich structure. The composite layer and the core show good stability under shearing process, and there is no peeling-off or cracking between the composite layer and the core.
{"title":"Experimental Study on Shear Property of Integrated Sandwich Panel ofAluminum Honeycomb and Epoxy Resin","authors":"Xin Yaju, Zhao Xuya, Liu Xiaoman, Tie Rui, Chen Shuliang","doi":"10.2174/1874155X01509011000","DOIUrl":"https://doi.org/10.2174/1874155X01509011000","url":null,"abstract":"In order to realize the functional integration, a new kind of sandwich panel was made. By carrying out quasi- static shear experiments, its elastic modulus and ultimate bearing capacity with different resin immersing thickness, thickness of additional layers of resin and thickness were investigated. And the load - displacement curves and failure morphology were obtained, which was compared with traditional aluminum honeycomb sandwich panel. The experiments indicate that the integrated aluminum honeycomb and epoxy resin sandwich panel's shearing process undergo three phases: elasticity, yield and destruction. The specimen's elastic modulus and ultimate bearing capacity increase with the increasing of the resin thickness, thickness of additional layers of resin and the thickness of the specimen, which have been greatly improved compared to the traditional sandwich structure. The composite layer and the core show good stability under shearing process, and there is no peeling-off or cracking between the composite layer and the core.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125215022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509011017
Mei Yi, Q. Jianjun
This paper studies the relationship between unsteady flow features and instantaneous torque and power performance of straight bladed vertical axis wind turbine at variable tip speed ratios. The rotor unsteady flow field simulation was carried out by using computational fluid dynamics method. The flow physics and the principle of changing flow filed acting on torque performance and power performance has been analyzed where the rotating rotor was the major concern. The results show that the flow feature alters from periodical blade dynamic stall vortexes generation, development and shedding at low tip speed ratio to cyclical formation, evolution and diffusion of blade wake flow with the rising tip speed ratio. Both vortex shedding around the blade and interaction of blade wakes degrade the rotor aerodynamic performance. It is suggested that, to absorbing the maximum wind energy, delaying the blade vortex shedding and reducing the range of blade wake evolution and diffusion should be included in the rotor aerodynamic design.
{"title":"Numerical Study of Flow Field and Aerodynamic Performance of StraightBladed VAWT at Variable Tip Speed Ratios","authors":"Mei Yi, Q. Jianjun","doi":"10.2174/1874155X01509011017","DOIUrl":"https://doi.org/10.2174/1874155X01509011017","url":null,"abstract":"This paper studies the relationship between unsteady flow features and instantaneous torque and power performance of straight bladed vertical axis wind turbine at variable tip speed ratios. The rotor unsteady flow field simulation was carried out by using computational fluid dynamics method. The flow physics and the principle of changing flow filed acting on torque performance and power performance has been analyzed where the rotating rotor was the major concern. The results show that the flow feature alters from periodical blade dynamic stall vortexes generation, development and shedding at low tip speed ratio to cyclical formation, evolution and diffusion of blade wake flow with the rising tip speed ratio. Both vortex shedding around the blade and interaction of blade wakes degrade the rotor aerodynamic performance. It is suggested that, to absorbing the maximum wind energy, delaying the blade vortex shedding and reducing the range of blade wake evolution and diffusion should be included in the rotor aerodynamic design.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114418289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010882
Zhen Chen, Xin-ya Chen, Yang Zhao
Adopting the parallel mechanism as the main body of the seat and the active joints with spring damping elements as the vibration actuator, we established the damping seat model with the parallel mechanism of six degrees of freedom 3-PRPS. To achieve good damping effect, the damping space and flexibility of the mechanism were improved by affecting the velocity matrix with branched speed built by vectors. Optimal parameter values were obtained by genetic algorithm. Finally, results were synthesized and verified to provide an important theoretical basis for the practical application of the mechanism.
{"title":"Research on the Optimization of the Vibration Reduction Seat Based onGenetic Algorithm","authors":"Zhen Chen, Xin-ya Chen, Yang Zhao","doi":"10.2174/1874155X01509010882","DOIUrl":"https://doi.org/10.2174/1874155X01509010882","url":null,"abstract":"Adopting the parallel mechanism as the main body of the seat and the active joints with spring damping elements as the vibration actuator, we established the damping seat model with the parallel mechanism of six degrees of freedom 3-PRPS. To achieve good damping effect, the damping space and flexibility of the mechanism were improved by affecting the velocity matrix with branched speed built by vectors. Optimal parameter values were obtained by genetic algorithm. Finally, results were synthesized and verified to provide an important theoretical basis for the practical application of the mechanism.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121925569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010944
Ling Jiao
To estimate the fatigue life of long-span steel bridge more accurately, this paper proposes a method for estimating the fatigue life of long-span bridges by considering vehicle-bridge coupled vibration. Firstly, the universal equation of vehicle-bridge vibration is derived based on triaxial standard multi-scale model of fatigue vehicle and bridge, and relevant program for vehicle-bridge coupled vibration is programmed. Secondly, a method for estimating the fatigue life of long-span steel bridge is proposed based on fracture mechanics theories, and the analysis process is expounded in details. Finally, the method for estimating fatigue life proposed in this paper is verified by taking a double pylon cable- stayed bridge with orthotropic steel bridge deck slab as an example.
{"title":"Estimation of Fatigue Life of Long-Span Bridge by Considering Vehicle-Bridge Coupled Vibration","authors":"Ling Jiao","doi":"10.2174/1874155X01509010944","DOIUrl":"https://doi.org/10.2174/1874155X01509010944","url":null,"abstract":"To estimate the fatigue life of long-span steel bridge more accurately, this paper proposes a method for estimating the fatigue life of long-span bridges by considering vehicle-bridge coupled vibration. Firstly, the universal equation of vehicle-bridge vibration is derived based on triaxial standard multi-scale model of fatigue vehicle and bridge, and relevant program for vehicle-bridge coupled vibration is programmed. Secondly, a method for estimating the fatigue life of long-span steel bridge is proposed based on fracture mechanics theories, and the analysis process is expounded in details. Finally, the method for estimating fatigue life proposed in this paper is verified by taking a double pylon cable- stayed bridge with orthotropic steel bridge deck slab as an example.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127657610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010859
T. Li, Zhenshan Wang
For hot extrusions of magnesium alloy sheets, Dissimilar AZ80 and AZ31 were used, in which AZ80 was placed on advancing side and AZ31 on retreating side, using friction stir butt welding with different process parameters. Some defect-free welded joints with good weld surfaces could be obtained with some suitable welding conditions. The maximum tensile strength of welded joint which is 225.5 MPa can reach 98% that of the AZ31 base material. Influence of process parameters on defects, weld shaping and mechanical property were discussed systematically. And the microstructure of different zones was compared. The fracture of the welded joints takes place at the junction of mechanical heat affected zone and nugget zone in AZ31 magnesium alloy set retreating side, since existing difference in metallographic structure of alloy diversely suffered by heat, pressure and depositing impurities. Fracture initiation site may be the P line defect which should be eliminated, and the P line defect formation was analyzed.
{"title":"Forming and Properties of Friction Stir Welding Process for DissimilarMg Alloy","authors":"T. Li, Zhenshan Wang","doi":"10.2174/1874155X01509010859","DOIUrl":"https://doi.org/10.2174/1874155X01509010859","url":null,"abstract":"For hot extrusions of magnesium alloy sheets, Dissimilar AZ80 and AZ31 were used, in which AZ80 was placed on advancing side and AZ31 on retreating side, using friction stir butt welding with different process parameters. Some defect-free welded joints with good weld surfaces could be obtained with some suitable welding conditions. The maximum tensile strength of welded joint which is 225.5 MPa can reach 98% that of the AZ31 base material. Influence of process parameters on defects, weld shaping and mechanical property were discussed systematically. And the microstructure of different zones was compared. The fracture of the welded joints takes place at the junction of mechanical heat affected zone and nugget zone in AZ31 magnesium alloy set retreating side, since existing difference in metallographic structure of alloy diversely suffered by heat, pressure and depositing impurities. Fracture initiation site may be the P line defect which should be eliminated, and the P line defect formation was analyzed.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130395217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-07DOI: 10.2174/1874155X01509010780
Cheng Tie, Zhou Ruichuan
Cable stayed bridge, also known as the cable-stayed bridge is of box girder with many cable directly to the towers is a kind of bridge, is by the pressure of the tower, tension of cable and bending bearing beams of a structure system. It can be considered as a continuous beam of multi span elastic supports for the cable instead of a pier. It can reduce the moment of the beam, reduce the height of the building, it reduce the weight of the structure and save the material. Stayed Bridge is a new form of bridge structure, The bridge structure special and complex forces, The deck transverse load and live load is to balance by tilting tower, By the general theory to analyze the cable-stayed bridge stayed bridge, The key is to consider the main tower tilt, Leaning further stress analysis, drawn stayed bridge mechanics analysis method.
{"title":"Mechanical Analysis of Stayed Bridge","authors":"Cheng Tie, Zhou Ruichuan","doi":"10.2174/1874155X01509010780","DOIUrl":"https://doi.org/10.2174/1874155X01509010780","url":null,"abstract":"Cable stayed bridge, also known as the cable-stayed bridge is of box girder with many cable directly to the towers is a kind of bridge, is by the pressure of the tower, tension of cable and bending bearing beams of a structure system. It can be considered as a continuous beam of multi span elastic supports for the cable instead of a pier. It can reduce the moment of the beam, reduce the height of the building, it reduce the weight of the structure and save the material. Stayed Bridge is a new form of bridge structure, The bridge structure special and complex forces, The deck transverse load and live load is to balance by tilting tower, By the general theory to analyze the cable-stayed bridge stayed bridge, The key is to consider the main tower tilt, Leaning further stress analysis, drawn stayed bridge mechanics analysis method.","PeriodicalId":267392,"journal":{"name":"The Open Mechanical Engineering Journal","volume":"88 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126309837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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