In the present work, developed the combustion chamber profiles for spray, wall, and air guided mode GDI engines. Modified the piston top surface for each combustion chamber geometry of GDI engine from hemispherical bowl to trapezoidal bowl and pent roof shape which include a scoop type bowl on one side (towards injector position) to impart better squish, swirl, tumble and turbulence effects required to improve the mixture formation. Also, modified the cylinder head to each combustion chamber with different locations of spark plug and fuel injector. Optimized the fuel split injections with durations, ignition timing and percentage of exhaust gas recirculation towards emissions reduction, especially soot and oxides of nitrogen. Emission tests were conducted on base diesel engine and all three modified combustion chamber geometry GDI engine. It is clear from the results that oxides of nitrogen emission in wall guided mode was reduced up to 5% till 75% of the loads when compare with both spray-guided and air-guided combustion modes, and later it is increased. Overall, wall guided combustion chamber geometry GDI engine shows better results at 150 bar FIP, when compare with base Diesel engine; oxides of nitrogen emissions were reduced from 377 ppm to 77 ppm and soot emissions were reduced from 29.3 g/km to 4.5 g/km at high torque.
在本工作中，开发了喷雾式、壁式和导风式GDI发动机的燃烧室廓形。改进了GDI发动机每个燃烧室的活塞顶面几何形状，从半球形碗形改为梯形碗形和pentent顶盖形状，其中包括一侧(朝向喷油器位置)的勺形碗形，以提供更好的压扁，漩涡，翻滚和湍流效果，以改善混合气的形成。同时，对每个燃烧室的火花塞和喷油器的不同位置的气缸盖进行了改进。优化燃油分离喷射的持续时间、点火时间和废气再循环的百分比，以减少排放，特别是烟尘和氮氧化物。在基础柴油机和三种改进型内燃机上进行了排放试验。结果表明，与喷燃和导燃两种燃烧方式相比，壁面导燃方式的氮氧化物排放量减少了5% ~ 75%，之后又有所增加。总体而言，与基础型柴油发动机相比，壁式燃烧室几何型GDI发动机在150 bar FIP时表现出更好的性能;高扭矩时氮氧化物排放量从377 PPM降至77 PPM，烟尘排放量从29.3 g/km降至4.5 g/km。
{"title":"Influence of Piston Crown Shape with Spark, Fuel injector positions, EGR and Fuel System Control on Emissions of Modified GDI Engines over base Diesel Engine","authors":"Shivakumar Nagareddy, Kumaresan Govindasamy","doi":"10.1139/tcsme-2021-0163","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0163","url":null,"abstract":"In the present work, developed the combustion chamber profiles for spray, wall, and air guided mode GDI engines. Modified the piston top surface for each combustion chamber geometry of GDI engine from hemispherical bowl to trapezoidal bowl and pent roof shape which include a scoop type bowl on one side (towards injector position) to impart better squish, swirl, tumble and turbulence effects required to improve the mixture formation. Also, modified the cylinder head to each combustion chamber with different locations of spark plug and fuel injector. Optimized the fuel split injections with durations, ignition timing and percentage of exhaust gas recirculation towards emissions reduction, especially soot and oxides of nitrogen. Emission tests were conducted on base diesel engine and all three modified combustion chamber geometry GDI engine. It is clear from the results that oxides of nitrogen emission in wall guided mode was reduced up to 5% till 75% of the loads when compare with both spray-guided and air-guided combustion modes, and later it is increased. Overall, wall guided combustion chamber geometry GDI engine shows better results at 150 bar FIP, when compare with base Diesel engine; oxides of nitrogen emissions were reduced from 377 ppm to 77 ppm and soot emissions were reduced from 29.3 g/km to 4.5 g/km at high torque.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43142840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the processing of titanium alloy, the milling parameters determine the process temperature and force. Increasing the milling temperature and force can affect the quality of the titanium alloy produced. In this study, we developed a multi-feature fusion model for high-quality titanium alloy workpieces. In the milling experiments with different milling parameters, an infrared thermal imager and a three-dimensional dynamometer were used to collect the time-domain signals for temperature near the tip of the milling cutter and the milling force. Based on the experimental data, a multi-feature fusion model was established with the milling temperature, milling force, and metal removal rate as the targeted variables, and the milling parameters as the optimized parameters. Based on the particle swarm optimization algorithm, the optimal milling parameters within the test parameters were resolved using the multi-feature fusion model. The results show that: within the milling parameter range of the experimental design, the optimal solutions for the milling parameters are: milling speed of 22.14 m/min; feed speed of 8.25 mm/min; milling depth of 1.36 mm. The multi-feature fusion model resulted in lower milling temperature and force, and provides theoretical guidance for scientifically designing the parameters for the milling process.
{"title":"Optimizing the parameters for force, temperature, and metal removal rate: a multi-feature fusion model for titanium alloy milling","authors":"Songyuan Li, S. Li, Yuqing Li, E. Popov","doi":"10.1139/tcsme-2021-0086","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0086","url":null,"abstract":"In the processing of titanium alloy, the milling parameters determine the process temperature and force. Increasing the milling temperature and force can affect the quality of the titanium alloy produced. In this study, we developed a multi-feature fusion model for high-quality titanium alloy workpieces. In the milling experiments with different milling parameters, an infrared thermal imager and a three-dimensional dynamometer were used to collect the time-domain signals for temperature near the tip of the milling cutter and the milling force. Based on the experimental data, a multi-feature fusion model was established with the milling temperature, milling force, and metal removal rate as the targeted variables, and the milling parameters as the optimized parameters. Based on the particle swarm optimization algorithm, the optimal milling parameters within the test parameters were resolved using the multi-feature fusion model. The results show that: within the milling parameter range of the experimental design, the optimal solutions for the milling parameters are: milling speed of 22.14 m/min; feed speed of 8.25 mm/min; milling depth of 1.36 mm. The multi-feature fusion model resulted in lower milling temperature and force, and provides theoretical guidance for scientifically designing the parameters for the milling process.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45390167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The work investigates the influence of multiwalled carbon nanotubes (MWCNTs) on the bending behavior of laminated, spherical, cylindrical, hyperbolic, and elliptical tapered composite panels made from a MWCNT–glass fiber–polymer hybrid and subjected to transverse loading conditions. The deflection and stress behavior of the composite panels were studied by developing a mathematical model based on high-order shear deformation theory using finite element (FE) formulation. In this context, the agglomeration and waviness of MWCNTs were modeled and characterized using the Eshelby–Mori–Tanaka approach and a continuum mechanics based 3-D representative volume element (RVE), respectively. Subsequently, glass fiber was introduced as a reinforcement phase, and the elastic properties of the three-phase hybrid composite material were obtained using the Chamis model. The developed FE formulation was validated theoretically and experimentally. Further, detailed parametric studies were performed to examine the influence of micromechanical and structural characteristics such as weight fraction of MWCNTs, weight fraction of fiber, type of load, taper configuration, curved geometry, curvature ratio, and length to thickness ratio of the panel on the bending behavior of the composite panels. The effective laminated tapered curved composite panel, TC-3, tailored with improved MWCNT characteristics, can substantially resist the stresses from a bending load.
{"title":"Bending response analysis of a laminated, tapered, curved, composite panel made from an agglomerated and wavy MWCNT–glass fiber–polymer hybrid","authors":"Mesfin Kebede Kassa, Ananda babu Arumugam","doi":"10.1139/tcsme-2021-0084","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0084","url":null,"abstract":"The work investigates the influence of multiwalled carbon nanotubes (MWCNTs) on the bending behavior of laminated, spherical, cylindrical, hyperbolic, and elliptical tapered composite panels made from a MWCNT–glass fiber–polymer hybrid and subjected to transverse loading conditions. The deflection and stress behavior of the composite panels were studied by developing a mathematical model based on high-order shear deformation theory using finite element (FE) formulation. In this context, the agglomeration and waviness of MWCNTs were modeled and characterized using the Eshelby–Mori–Tanaka approach and a continuum mechanics based 3-D representative volume element (RVE), respectively. Subsequently, glass fiber was introduced as a reinforcement phase, and the elastic properties of the three-phase hybrid composite material were obtained using the Chamis model. The developed FE formulation was validated theoretically and experimentally. Further, detailed parametric studies were performed to examine the influence of micromechanical and structural characteristics such as weight fraction of MWCNTs, weight fraction of fiber, type of load, taper configuration, curved geometry, curvature ratio, and length to thickness ratio of the panel on the bending behavior of the composite panels. The effective laminated tapered curved composite panel, TC-3, tailored with improved MWCNT characteristics, can substantially resist the stresses from a bending load.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44791730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, I report on an investigation of the forced vibrations procured by an arbitrary angled time-harmonic loading from a plate based on a rigid foundation. The study was formulated according to the three-dimensional linearized theory of elasticity for solids under initial stress (TLTESIS). It was assumed throughout the investigation that there is a rigid clamped state between the system and the rigid ground; further, it was assumed that the plate was exposed to biaxially static initial stresses. Given this, a mathematical model was developed, and then solved using a three-dimensional finite element method (3D-FEM). Presented are numerical investigations that illustrate the influence of changes in the inclination of the force, as well as other important factors such as dimensionless frequency parameters, on the dynamic behavior of the system. In particular, the results indicate that the effect the initial stresses have on the dynamic stress distribution character increases with the aspect ratio but decreases with the thickness ratio.
{"title":"Modeling the effect of the inclination angle on the dynamic response of a biaxially pre-stressed plate","authors":"Ahmet Daşdemir","doi":"10.1139/tcsme-2020-0111","DOIUrl":"https://doi.org/10.1139/tcsme-2020-0111","url":null,"abstract":"In this study, I report on an investigation of the forced vibrations procured by an arbitrary angled time-harmonic loading from a plate based on a rigid foundation. The study was formulated according to the three-dimensional linearized theory of elasticity for solids under initial stress (TLTESIS). It was assumed throughout the investigation that there is a rigid clamped state between the system and the rigid ground; further, it was assumed that the plate was exposed to biaxially static initial stresses. Given this, a mathematical model was developed, and then solved using a three-dimensional finite element method (3D-FEM). Presented are numerical investigations that illustrate the influence of changes in the inclination of the force, as well as other important factors such as dimensionless frequency parameters, on the dynamic behavior of the system. In particular, the results indicate that the effect the initial stresses have on the dynamic stress distribution character increases with the aspect ratio but decreases with the thickness ratio.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49206525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tuned particle damper (TPD) has been proposed for improving the damping performance of the traditional particle damper by introducing the dynamic vibration absorption structure. To better design TPD that can be seen as a dynamic vibration absorber (DVA) with particle damping, the change of dynamical characteristic of a DVA system was explored based on a primary cantilever system by introducing stainless steel balls and carbon steel mass block respectively. By a series of sine sweep tests on the primary cantilever system attached with a spring-mass structure, a host of frequency response function (FRF) curves under different conditions were obtained. Experimental results show that the dynamic behavior of the primary cantilever system is more displayed on the resonance peak closer to the mass control area, while the dynamic behavior of the additional spring-mass structure is more displayed on the resonance peak closer to the stiffness control area. Based on the results, the abnormal but desirable dynamical characteristic of TPD presented in the discrete mass experiment is analyzed, which indicates preliminarily the design direction of TPD structure in engineering practice.
{"title":"Experimental investigation of dynamic vibration absorption structure for designing better tuned particle damper","authors":"Kai Zhang, Farong Kou","doi":"10.1139/tcsme-2021-0015","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0015","url":null,"abstract":"Tuned particle damper (TPD) has been proposed for improving the damping performance of the traditional particle damper by introducing the dynamic vibration absorption structure. To better design TPD that can be seen as a dynamic vibration absorber (DVA) with particle damping, the change of dynamical characteristic of a DVA system was explored based on a primary cantilever system by introducing stainless steel balls and carbon steel mass block respectively. By a series of sine sweep tests on the primary cantilever system attached with a spring-mass structure, a host of frequency response function (FRF) curves under different conditions were obtained. Experimental results show that the dynamic behavior of the primary cantilever system is more displayed on the resonance peak closer to the mass control area, while the dynamic behavior of the additional spring-mass structure is more displayed on the resonance peak closer to the stiffness control area. Based on the results, the abnormal but desirable dynamical characteristic of TPD presented in the discrete mass experiment is analyzed, which indicates preliminarily the design direction of TPD structure in engineering practice.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42872820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Helicopters can be considered as “any-terrain vehicles” as they can take off and land at any location. The aerodynamic characteristics of helicopters are more complicated than those of fixed-wing aircraft. The rotor is the source of lift and thrust for helicopters. The complex aerodynamic characteristics of helicopters are due to their rotational frame and because variations in velocity and pressure throughout the blades. Moreover, the airfoil undergoes phase changes because half of the phase exhibits a trailing edge toward the flow. In this study, four isolated helicopter rotor blades were analyzed using ANSYS Fluent in terms of flow in a static domain under a non-rotating condition. Supercritical airfoils used in high-speed aircraft were found to be incredibly useful in the transonic region. They increase the critical and drag-divergence Mach numbers. Incorporating supercritical airfoils in helicopter rotor blades ensures suitable flow characteristics and more than 50% efficiency compared with those of the HH02 blade in a stationary frame. Analyses were conducted for HH02 and NASA SC(2)-0714 airfoils considering Mach numbers of 0.3, 0.4, and 0.5 without rotation. The post-processing results prove that the NASA SC(2)-0714 airfoil rotor achieves better aerodynamic performance than the HH02 airfoil rotor.
{"title":"Aerodynamic performance analysis of supercritical airfoil in Helicopter main rotor","authors":"Inamul Hasan, M. R., R. P, S. R","doi":"10.1139/tcsme-2021-0067","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0067","url":null,"abstract":"Helicopters can be considered as “any-terrain vehicles” as they can take off and land at any location. The aerodynamic characteristics of helicopters are more complicated than those of fixed-wing aircraft. The rotor is the source of lift and thrust for helicopters. The complex aerodynamic characteristics of helicopters are due to their rotational frame and because variations in velocity and pressure throughout the blades. Moreover, the airfoil undergoes phase changes because half of the phase exhibits a trailing edge toward the flow. In this study, four isolated helicopter rotor blades were analyzed using ANSYS Fluent in terms of flow in a static domain under a non-rotating condition. Supercritical airfoils used in high-speed aircraft were found to be incredibly useful in the transonic region. They increase the critical and drag-divergence Mach numbers. Incorporating supercritical airfoils in helicopter rotor blades ensures suitable flow characteristics and more than 50% efficiency compared with those of the HH02 blade in a stationary frame. Analyses were conducted for HH02 and NASA SC(2)-0714 airfoils considering Mach numbers of 0.3, 0.4, and 0.5 without rotation. The post-processing results prove that the NASA SC(2)-0714 airfoil rotor achieves better aerodynamic performance than the HH02 airfoil rotor.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42022023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Uzair, Syed Umair Hassan Kazmi, M. Yousuf, Syed Asad Ali Zaidi
To incorporate solar energy efficiently into a country, it is needed to know the optimal tilt and azimuth angle of the solar collectors' location. Also, to build a solar park, it is necessary to know the most suitable and high-energy generating place inside a country, thus saving time and money. This study analyzed collector geometry for Karachi in particular and Pakistan in general. Karachi has the potential of 339.36 kW-hr/m2/annum energy at an annually optimal fixed tilt of 26°. In case collector geometry had to be changed in Karachi, a range of 40° azimuth angle and 20° tilt angle from its maximum value is available. The power produced in this case would only have a difference of 1%. Optimal yearly and monthly tilt of most of the locations of Pakistan (300+) were calculated. Through them, it was revealed that the Optimal Tilt of Pakistan follows the value of latitude closely. Generally, changing the tilt angle monthly is recommended for areas that produce more energy, while fixed annual tilt could be suitable for low energy-producing regions. Effects of temperature were also incorporated while finding the energy produced by the photovoltaic (PV) panels.
{"title":"Optimization of performance of PV panels and selection of best site for solar park in Pakistan","authors":"M. Uzair, Syed Umair Hassan Kazmi, M. Yousuf, Syed Asad Ali Zaidi","doi":"10.1139/tcsme-2021-0134","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0134","url":null,"abstract":"To incorporate solar energy efficiently into a country, it is needed to know the optimal tilt and azimuth angle of the solar collectors' location. Also, to build a solar park, it is necessary to know the most suitable and high-energy generating place inside a country, thus saving time and money. This study analyzed collector geometry for Karachi in particular and Pakistan in general. Karachi has the potential of 339.36 kW-hr/m2/annum energy at an annually optimal fixed tilt of 26°. In case collector geometry had to be changed in Karachi, a range of 40° azimuth angle and 20° tilt angle from its maximum value is available. The power produced in this case would only have a difference of 1%. Optimal yearly and monthly tilt of most of the locations of Pakistan (300+) were calculated. Through them, it was revealed that the Optimal Tilt of Pakistan follows the value of latitude closely. Generally, changing the tilt angle monthly is recommended for areas that produce more energy, while fixed annual tilt could be suitable for low energy-producing regions. Effects of temperature were also incorporated while finding the energy produced by the photovoltaic (PV) panels.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41525408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kuanyu Liu, Xinsheng Yang, Li Zhou, Ming Li, Weijin Zhu
The reaming process of the 6061 aluminum alloy plate after cold expansion with split sleeve was simulated by finite element (FE) method based on Abaqus/CAE, the relationship between the reaming depths and the distribution of residual stress fields is obtained by analysis. The fatigue lives of the plate under different reaming depths were calculated by using the fatigue analysis software FE-SAFE, and verified by fatigue tests. The results show that reaming after expansion will increase the residual compressive stress at the hole edge on the entrance surface. In addition, the fatigue life of the specimens increases with the increase of the reaming depth, and the best fatigue gain of the specimen is obtained when the reaming depth of 0.5 mm.
{"title":"Numerical investigation of the effect of hole reaming on fatigue life by cold expansion","authors":"Kuanyu Liu, Xinsheng Yang, Li Zhou, Ming Li, Weijin Zhu","doi":"10.1139/tcsme-2021-0123","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0123","url":null,"abstract":"The reaming process of the 6061 aluminum alloy plate after cold expansion with split sleeve was simulated by finite element (FE) method based on Abaqus/CAE, the relationship between the reaming depths and the distribution of residual stress fields is obtained by analysis. The fatigue lives of the plate under different reaming depths were calculated by using the fatigue analysis software FE-SAFE, and verified by fatigue tests. The results show that reaming after expansion will increase the residual compressive stress at the hole edge on the entrance surface. In addition, the fatigue life of the specimens increases with the increase of the reaming depth, and the best fatigue gain of the specimen is obtained when the reaming depth of 0.5 mm.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47742388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the field of pressure vessel fatigue life, the study of fracture failure is very important. Based on the Paris law, the relation model between fatigue crack size and residual fatigue life is established by considering the circumferential stress. The relationship between the crack length and the crack depth is introduced. According to the specific structure of the pressure vessel, the relationship model between the fatigue crack size and the residual strength is established based on the residual strength allowable value. The S-N curve of pressure vessel is obtained based on two models. The fatigue life of the pressure vessel is predicted combined with the actual test data. By comparing with the actual service life, the feasibility of the model is verified, which provides a new method for predicting the residual life of pressure vessels.
{"title":"Fatigue life analysis of pressure vessel based on residual strength and crack size","authors":"Mengyu Zhu, Xintian Liu, Jiafeng Lai, Jiao Luo","doi":"10.1139/tcsme-2021-0063","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0063","url":null,"abstract":"In the field of pressure vessel fatigue life, the study of fracture failure is very important. Based on the Paris law, the relation model between fatigue crack size and residual fatigue life is established by considering the circumferential stress. The relationship between the crack length and the crack depth is introduced. According to the specific structure of the pressure vessel, the relationship model between the fatigue crack size and the residual strength is established based on the residual strength allowable value. The S-N curve of pressure vessel is obtained based on two models. The fatigue life of the pressure vessel is predicted combined with the actual test data. By comparing with the actual service life, the feasibility of the model is verified, which provides a new method for predicting the residual life of pressure vessels.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41771158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An optimized multi-scale reverse discrete entropy (RDE, OMRDE) method for feature extraction is proposed to address the lack of effective feature extraction and detection methods for combining harvester assembly fault inspection. This method is used to extract vibration signal features from the harvester. A fault diagnostic method is designed to verify the efficiency of the associated methods. First, a comparative study of RDE, multi-scale inverse RDE (MRDE), and OMRDE was performed using simulated signals to verify the effectiveness of OMRDE. Second, the FSTPSO–VMD method was used to decompose the vibration signal of the combine harvester assembly fault, and the OMRDE, MRDE, and fuzzy entropy were compared and analyzed. The actual feature extraction effect of the three entropy functions reached the highest classification accuracy (88.5%) after using OMRDE to extract features. Finally, a fusion feature set is constructed to further improve the classification accuracy, and the LSSVM classifier is further optimized through FSTPSO. Analytical results show that the FSTPSO–LSSVM classifier constructed in this work adopts the fused feature with an accuracy of 93%, which is better than other common methods and verifies the validity of the fault diagnostic model. Therefore, the performance of the OMRDE proposed in this work is better than those of MRDE and MRDE. The proposed fault diagnostic model can realize accurate classification of the combine harvester assembly fault detection.
{"title":"Combine Assembly Fault Diagnosis Based on Optimized Multi-scale Reverse Discrete Entropy","authors":"S. Zhao, Jiaming Zhang, Liyou Xu, Xiaoliang Chen","doi":"10.1139/tcsme-2021-0090","DOIUrl":"https://doi.org/10.1139/tcsme-2021-0090","url":null,"abstract":"An optimized multi-scale reverse discrete entropy (RDE, OMRDE) method for feature extraction is proposed to address the lack of effective feature extraction and detection methods for combining harvester assembly fault inspection. This method is used to extract vibration signal features from the harvester. A fault diagnostic method is designed to verify the efficiency of the associated methods. First, a comparative study of RDE, multi-scale inverse RDE (MRDE), and OMRDE was performed using simulated signals to verify the effectiveness of OMRDE. Second, the FSTPSO–VMD method was used to decompose the vibration signal of the combine harvester assembly fault, and the OMRDE, MRDE, and fuzzy entropy were compared and analyzed. The actual feature extraction effect of the three entropy functions reached the highest classification accuracy (88.5%) after using OMRDE to extract features. Finally, a fusion feature set is constructed to further improve the classification accuracy, and the LSSVM classifier is further optimized through FSTPSO. Analytical results show that the FSTPSO–LSSVM classifier constructed in this work adopts the fused feature with an accuracy of 93%, which is better than other common methods and verifies the validity of the fault diagnostic model. Therefore, the performance of the OMRDE proposed in this work is better than those of MRDE and MRDE. The proposed fault diagnostic model can realize accurate classification of the combine harvester assembly fault detection.","PeriodicalId":23285,"journal":{"name":"Transactions of The Canadian Society for Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41477039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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