Pub Date : 2024-08-30DOI: 10.1177/09544089241277692
M. Giridharadhayalan, T. Ramkumar, M. Selvakumar
The composite material under this investigation was fabricated using the microwave sintering process. The matrix materials chosen for the preparation of composite materials include pure titanium (Ti), aluminium (Al), and tin (Sn). Tungsten (W) is used as the reinforcing material, with variable weight percentages of 0.5%, 1%, 1.5%, 2%, and 2.5%. The purpose of this study is to assess the fundamental mechanical properties (microhardness, elastic moduli, fracture toughness, contact stiffness, etc.) and surface degradation properties (wear) of the composite materials that were fabricated. Furthermore, energy-dispersive X-ray spectroscopy with line mapping analysis were performed to verify the existence of reinforcement particles evenly distributed in the matrix material and scanning electron microscope (FE-SEM) examination was done on the wear tested samples. The density of the Ti-5Al-2.5Sn-2W composite material has been enhanced in comparison to the density of Ti-5Al-2.5Sn. The results of the Micro Vickers hardness test indicate that the Ti-5Al-2.5Sn-2W composite exhibits a hardness that is 3.1% higher than that of the Ti-5Al-2.5Sn material. In comparison to Ti-5Al-2.5Sn, the Ti-5Al-2.5Sn-2W composite displayed a 10% lower wear rate and 7% coefficient of friction, respectively. The findings show that increasing the weight percentage of tungsten (W) greatly enhances the mechanical and wear characteristics of the composites.
{"title":"Investigation on the mechanical and tribological behavior of tungsten-reinforced Ti-5Al-2.5Sn composites","authors":"M. Giridharadhayalan, T. Ramkumar, M. Selvakumar","doi":"10.1177/09544089241277692","DOIUrl":"https://doi.org/10.1177/09544089241277692","url":null,"abstract":"The composite material under this investigation was fabricated using the microwave sintering process. The matrix materials chosen for the preparation of composite materials include pure titanium (Ti), aluminium (Al), and tin (Sn). Tungsten (W) is used as the reinforcing material, with variable weight percentages of 0.5%, 1%, 1.5%, 2%, and 2.5%. The purpose of this study is to assess the fundamental mechanical properties (microhardness, elastic moduli, fracture toughness, contact stiffness, etc.) and surface degradation properties (wear) of the composite materials that were fabricated. Furthermore, energy-dispersive X-ray spectroscopy with line mapping analysis were performed to verify the existence of reinforcement particles evenly distributed in the matrix material and scanning electron microscope (FE-SEM) examination was done on the wear tested samples. The density of the Ti-5Al-2.5Sn-2W composite material has been enhanced in comparison to the density of Ti-5Al-2.5Sn. The results of the Micro Vickers hardness test indicate that the Ti-5Al-2.5Sn-2W composite exhibits a hardness that is 3.1% higher than that of the Ti-5Al-2.5Sn material. In comparison to Ti-5Al-2.5Sn, the Ti-5Al-2.5Sn-2W composite displayed a 10% lower wear rate and 7% coefficient of friction, respectively. The findings show that increasing the weight percentage of tungsten (W) greatly enhances the mechanical and wear characteristics of the composites.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226207","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}
Pub Date : 2024-08-30DOI: 10.1177/09544089241272918
B. Shankar Goud, Utpal Jyoti Das, Nayan Mani Majumdar
This study has been carried out to understand unsteady MHD slip flow of water-based ternary hybrid nanofluid, including platelet Ag, titanium dioxide [Formula: see text] and cylindrical [Formula: see text] nanoparticles, across an angled sheet. The complicated scenario above investigates how ternary hybrid nanofluid behaves when it stretched across an inclined surface in the existence of magnetic field. Understanding of this relationship is essential in complex thermal systems, such as energy-generating technologies and cooling mechanisms. This study can help optimise heat transfer rates, improve thermal conductivity and increase efficiency in real applications by adjusting flow parameters and temperature distribution. In the existence of first-order velocity slip, heat transfer has been examined, taking into account porous media, activation energy, and chemical reaction. The novel impacts of magnetic field and effective thermophysical properties of ternary nanofluid are considered, and a new model for heat transfer is successfully implemented. Oil extraction from hydrocarbon sources and smelting metal and semiconductor combinations to create semiconductor devices comprise two useful applications for this activity. The study is more accommodating due to the Soret effect. The relevant similarity transformations are applied in primary equations, and a built-in bvp4c program is employed for solutions. The effectiveness of the numerical approach is demonstrated by thorough agreement with results published in the past. Key conclusions are as follows: greater values of first-order slip parameter cause the flow to slow down; increase in the Soret number causes the flow to speed up; and fluid movement slips by higher values of the chemical reaction. Activation energy enhances the fluid concentration.
{"title":"Dissipative MHD flow of ternary hybrid Ag–TiO2–Al2O3/H2O nanofluid over an inclined sheet with activation energy","authors":"B. Shankar Goud, Utpal Jyoti Das, Nayan Mani Majumdar","doi":"10.1177/09544089241272918","DOIUrl":"https://doi.org/10.1177/09544089241272918","url":null,"abstract":"This study has been carried out to understand unsteady MHD slip flow of water-based ternary hybrid nanofluid, including platelet Ag, titanium dioxide [Formula: see text] and cylindrical [Formula: see text] nanoparticles, across an angled sheet. The complicated scenario above investigates how ternary hybrid nanofluid behaves when it stretched across an inclined surface in the existence of magnetic field. Understanding of this relationship is essential in complex thermal systems, such as energy-generating technologies and cooling mechanisms. This study can help optimise heat transfer rates, improve thermal conductivity and increase efficiency in real applications by adjusting flow parameters and temperature distribution. In the existence of first-order velocity slip, heat transfer has been examined, taking into account porous media, activation energy, and chemical reaction. The novel impacts of magnetic field and effective thermophysical properties of ternary nanofluid are considered, and a new model for heat transfer is successfully implemented. Oil extraction from hydrocarbon sources and smelting metal and semiconductor combinations to create semiconductor devices comprise two useful applications for this activity. The study is more accommodating due to the Soret effect. The relevant similarity transformations are applied in primary equations, and a built-in bvp4c program is employed for solutions. The effectiveness of the numerical approach is demonstrated by thorough agreement with results published in the past. Key conclusions are as follows: greater values of first-order slip parameter cause the flow to slow down; increase in the Soret number causes the flow to speed up; and fluid movement slips by higher values of the chemical reaction. Activation energy enhances the fluid concentration.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204799","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}
Pub Date : 2024-08-28DOI: 10.1177/09544089241270749
Sheng Hu, Di Wu, Xi Zhang, Pinjian Wang
To address the problem of quality optimization of multi-correlation parameters in the spinning process, this paper proposes a new method based on a sparrow search algorithm (SSA). Firstly, a generalized regression neural network (GRNN) is used to investigate the impact of the spinning process parameters on yarn quality, and quality forward modeling in the spinning process is established. And based on the coupling and correlation characteristics of spinning process parameters, sensitivity analysis is used to analyze the influence of each spinning process parameter on yarn quality, the correlation spinning process parameters for further analysis. Then a model of quality optimization with spinning process parameters is established, and SSA is used to solve the model of quality optimization with multi-correlation parameters in the spinning process. Finally, the effectiveness of the proposed method was validated through an instance. The results show that the optimal spinning process parameters combination generation of [32.159 5.2 0.8 14.8 24.540 8588.677 21.708] occurs in a configuration with a fitness value of 0.0003. The proposed sensitivity analysis-based quality optimization strategy reveals good performances in terms of both convergence speed and optimization accuracy, which will provide guidance for improving yarn quality.
{"title":"Sensitivity analysis-based quality optimization strategy for multi-correlation parameters in spinning process","authors":"Sheng Hu, Di Wu, Xi Zhang, Pinjian Wang","doi":"10.1177/09544089241270749","DOIUrl":"https://doi.org/10.1177/09544089241270749","url":null,"abstract":"To address the problem of quality optimization of multi-correlation parameters in the spinning process, this paper proposes a new method based on a sparrow search algorithm (SSA). Firstly, a generalized regression neural network (GRNN) is used to investigate the impact of the spinning process parameters on yarn quality, and quality forward modeling in the spinning process is established. And based on the coupling and correlation characteristics of spinning process parameters, sensitivity analysis is used to analyze the influence of each spinning process parameter on yarn quality, the correlation spinning process parameters for further analysis. Then a model of quality optimization with spinning process parameters is established, and SSA is used to solve the model of quality optimization with multi-correlation parameters in the spinning process. Finally, the effectiveness of the proposed method was validated through an instance. The results show that the optimal spinning process parameters combination generation of [32.159 5.2 0.8 14.8 24.540 8588.677 21.708] occurs in a configuration with a fitness value of 0.0003. The proposed sensitivity analysis-based quality optimization strategy reveals good performances in terms of both convergence speed and optimization accuracy, which will provide guidance for improving yarn quality.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204828","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}
Although there are many studies related to design, modeling, and optimization of fused deposition modeling (FDM) process parameters in the literature, the absence of a systematic approach to increase the reliability of model selection and optimization results is an important shortcoming that must be addressed. To make up for this deficiency, a new strategy was proposed to obtain desired quality on mechanical properties by adjusting FDM process parameters. This attempt involves manufacturing, modeling, and optimization point of view. The D-optimal method was employed to form experiment set, including process parameters. A hybrid approach neuro regression combining artificial neural network (ANN) and regression analysis together was used for modeling of FDM process. The most significant advantage of the neuro-regression approach compared to ANN is that the mathematical models can be used directly without needing any transformation. This is not possible in neural networks and, therefore, significantly limits and complicates the use of models obtained using ANN. The present study aims at optimization of the FDM process parameters, including infill density, infill pattern, layer thickness, and print speed on ultimate strength, fracture strength, and fracture strain for polylactide (PLA). In this regard, modified versions of the optimization algorithms Differential Evolution, Nelder Mead, and Simulated Annealing were used to find the best or elite designs. Linear or nonlinear models consisting of polynomial, trigonometric, and logarithmic expressions and their hybrid forms were employed to define the strength and strain behavior of PLA. It is concluded that (a) implementations of the optimization algorithms provide a 19% improving the minimum strain value if it is compared with the experimental results, (b) infill pattern types ( x2) were found as honeycomb, triangle, and cubic for the designs in terms of maximum fracture strength, minimum strain, and maximum ultimate tensile strength respectively, (c) many alternatives near optimum local designs could be obtained based on Nelder Mead algorithm for fracture strength and ultimate strength parameters. Thus, this allows work in a wide range of applications without depending on a single result for production.
{"title":"A new strategy for manufacturing, modeling, and optimization of 3D printed polylactide based on multiple nonlinear neuro regression analysis and stochastic optimization methods","authors":"Melih Savran, Levent Aydin, Asil Ayaz, Tuğrul Uslu","doi":"10.1177/09544089241272909","DOIUrl":"https://doi.org/10.1177/09544089241272909","url":null,"abstract":"Although there are many studies related to design, modeling, and optimization of fused deposition modeling (FDM) process parameters in the literature, the absence of a systematic approach to increase the reliability of model selection and optimization results is an important shortcoming that must be addressed. To make up for this deficiency, a new strategy was proposed to obtain desired quality on mechanical properties by adjusting FDM process parameters. This attempt involves manufacturing, modeling, and optimization point of view. The D-optimal method was employed to form experiment set, including process parameters. A hybrid approach neuro regression combining artificial neural network (ANN) and regression analysis together was used for modeling of FDM process. The most significant advantage of the neuro-regression approach compared to ANN is that the mathematical models can be used directly without needing any transformation. This is not possible in neural networks and, therefore, significantly limits and complicates the use of models obtained using ANN. The present study aims at optimization of the FDM process parameters, including infill density, infill pattern, layer thickness, and print speed on ultimate strength, fracture strength, and fracture strain for polylactide (PLA). In this regard, modified versions of the optimization algorithms Differential Evolution, Nelder Mead, and Simulated Annealing were used to find the best or elite designs. Linear or nonlinear models consisting of polynomial, trigonometric, and logarithmic expressions and their hybrid forms were employed to define the strength and strain behavior of PLA. It is concluded that (a) implementations of the optimization algorithms provide a 19% improving the minimum strain value if it is compared with the experimental results, (b) infill pattern types ( x<jats:sub>2</jats:sub>) were found as honeycomb, triangle, and cubic for the designs in terms of maximum fracture strength, minimum strain, and maximum ultimate tensile strength respectively, (c) many alternatives near optimum local designs could be obtained based on Nelder Mead algorithm for fracture strength and ultimate strength parameters. Thus, this allows work in a wide range of applications without depending on a single result for production.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204807","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}
Pub Date : 2024-08-28DOI: 10.1177/09544089241272870
Vivek Singh, Rajesh Kumar Sharma, Rakesh Sehgal
In the present study, δ-TaN thin films were deposited by reactive magnetron sputtering (physical vapour deposition) on Ti6Al7Nb alloy by varying the deposition pressure (0.8–0.2 Pa). Their crystalline structure, chemical composition, surface roughness, and surface morphology were investigated by using grazing incidence X-ray diffraction, energy dispersive spectroscopy, scanning probe microscope, and field emission scanning electron microscopy (FESEM), respectively. Structural analysis results confirmed the deposition of cubic δ-TaN thin films along the (111) basal plane; moreover, spherical dome-like surface morphology was observed by FESEM. Further, to analyze the nanomechanical properties of the deposited δ-TaN coatings, such as hardness (H) and modulus (E), scratch tests were performed utilizing the nanomechanical system. Moreover, friction and wear properties of the coating and bare sample (substrate) were investigated on nano-tribometer equipment using a rotary ball-on-disk type configuration. The stainless steel (SS-316) and silicon nitride (Si3N4) balls were used as the counter materials for the tribological tests. The observations of nanomechanical tests revealed that H (GPa), E (GPa), and H/E ratio values increased from 11.83 to 28.30 GPa, 176.02 to 248.45 GPa, and 0.06 to 0.11, respectively, with the decrease of the deposition pressure. In the scratch test, the highest critical load (cohesion failure) was found for δ-TaN coating deposited at the lowest deposition pressure (0.2 Pa). Tribological results of δ-TaN coatings demonstrated average coefficient of friction (COF) value ranges between 0.066–0.092 and 0.072–0.029 against steel and Si3N4 balls, respectively. The wear rate values were observed to vary from 8.15 × 10−5 to 7.56 × 10−6 and from 1.77 × 10−3 to 8.99 × 10−6 against steel and Si3N4 balls, respectively. Generally, the average COF and wear rate decreased against 316 SS and Si3N4 balls as the deposition pressure of coatings decreased. However, the coating deposited at 0.8 and 0.6 Pa against Si3N4 ball showed early delamination of the coating, resulting in the sudden fluctuation in COF plots and higher wear rate in the range of 10−3 mm3/N.m.
{"title":"Impact of deposition pressure on the structural, nanomechanical, and tribological properties of δ-TaN coatings deposited via magnetron sputtering on Ti6Al7Nb alloy","authors":"Vivek Singh, Rajesh Kumar Sharma, Rakesh Sehgal","doi":"10.1177/09544089241272870","DOIUrl":"https://doi.org/10.1177/09544089241272870","url":null,"abstract":"In the present study, δ-TaN thin films were deposited by reactive magnetron sputtering (physical vapour deposition) on Ti6Al7Nb alloy by varying the deposition pressure (0.8–0.2 Pa). Their crystalline structure, chemical composition, surface roughness, and surface morphology were investigated by using grazing incidence X-ray diffraction, energy dispersive spectroscopy, scanning probe microscope, and field emission scanning electron microscopy (FESEM), respectively. Structural analysis results confirmed the deposition of cubic δ-TaN thin films along the (111) basal plane; moreover, spherical dome-like surface morphology was observed by FESEM. Further, to analyze the nanomechanical properties of the deposited δ-TaN coatings, such as hardness (H) and modulus (E), scratch tests were performed utilizing the nanomechanical system. Moreover, friction and wear properties of the coating and bare sample (substrate) were investigated on nano-tribometer equipment using a rotary ball-on-disk type configuration. The stainless steel (SS-316) and silicon nitride (Si<jats:sub>3</jats:sub>N<jats:sub>4</jats:sub>) balls were used as the counter materials for the tribological tests. The observations of nanomechanical tests revealed that H (GPa), E (GPa), and H/E ratio values increased from 11.83 to 28.30 GPa, 176.02 to 248.45 GPa, and 0.06 to 0.11, respectively, with the decrease of the deposition pressure. In the scratch test, the highest critical load (cohesion failure) was found for δ-TaN coating deposited at the lowest deposition pressure (0.2 Pa). Tribological results of δ-TaN coatings demonstrated average coefficient of friction (COF) value ranges between 0.066–0.092 and 0.072–0.029 against steel and Si<jats:sub>3</jats:sub>N<jats:sub>4</jats:sub> balls, respectively. The wear rate values were observed to vary from 8.15 × 10<jats:sup>−5</jats:sup> to 7.56 × 10<jats:sup>−6</jats:sup> and from 1.77 × 10<jats:sup>−3</jats:sup> to 8.99 × 10<jats:sup>−6</jats:sup> against steel and Si<jats:sub>3</jats:sub>N<jats:sub>4</jats:sub> balls, respectively. Generally, the average COF and wear rate decreased against 316 SS and Si<jats:sub>3</jats:sub>N<jats:sub>4</jats:sub> balls as the deposition pressure of coatings decreased. However, the coating deposited at 0.8 and 0.6 Pa against Si<jats:sub>3</jats:sub>N<jats:sub>4</jats:sub> ball showed early delamination of the coating, resulting in the sudden fluctuation in COF plots and higher wear rate in the range of 10<jats:sup>−3</jats:sup> mm<jats:sup>3</jats:sup>/N.m.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204801","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}
Pub Date : 2024-08-28DOI: 10.1177/09544089241276337
Guddakesh Kumar Chandan, Mohd Aslam, Subhankar Saha, Brajesh Kumar Kanchan
The present study aims to probe the influence of nanosecond laser parameters on the surface quality of aluminum material (Al 6061) using a full factorial design approach. Additionally, the study utilizes the Harris Hawks optimization (HHO) algorithm to determine the optimized laser parameters for achieving desirable surface features on straight-cut aluminum samples. Subsequently, the machined samples are analyzed through optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The evaluation criteria for the present study are taper, surface roughness, and heat-affected zone (HAZ) thickness. The results revealed that average laser power significantly impacted the taper (17.01%), and scanning speed contributed significantly to the taper (26.62%). The average power and scanning speed combined showed the most substantial influence on taper (47.76%). Furthermore, the average power had the most significant effect on the heat-affected zone (77.76%) and surface roughness (SR) (72.22%). The optimal conditions determined by the HHO were a pulse frequency of 100 Hz, a scanning speed of 10 mm/s, and an average power of 40 W, resulting in heat-affected zone = 36.047, surface roughness = 5.496, and taper angle = 23.188. These findings hold significant implications for enhancing the surface characteristics of aluminum in laser machining processes, thereby benefiting industries such as aerospace, automotive, and electronics.
{"title":"Exploring the machining characteristics of aluminum 6061 using nanosecond pulse fiber laser machine","authors":"Guddakesh Kumar Chandan, Mohd Aslam, Subhankar Saha, Brajesh Kumar Kanchan","doi":"10.1177/09544089241276337","DOIUrl":"https://doi.org/10.1177/09544089241276337","url":null,"abstract":"The present study aims to probe the influence of nanosecond laser parameters on the surface quality of aluminum material (Al 6061) using a full factorial design approach. Additionally, the study utilizes the Harris Hawks optimization (HHO) algorithm to determine the optimized laser parameters for achieving desirable surface features on straight-cut aluminum samples. Subsequently, the machined samples are analyzed through optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The evaluation criteria for the present study are taper, surface roughness, and heat-affected zone (HAZ) thickness. The results revealed that average laser power significantly impacted the taper (17.01%), and scanning speed contributed significantly to the taper (26.62%). The average power and scanning speed combined showed the most substantial influence on taper (47.76%). Furthermore, the average power had the most significant effect on the heat-affected zone (77.76%) and surface roughness (SR) (72.22%). The optimal conditions determined by the HHO were a pulse frequency of 100 Hz, a scanning speed of 10 mm/s, and an average power of 40 W, resulting in heat-affected zone = 36.047, surface roughness = 5.496, and taper angle = 23.188. These findings hold significant implications for enhancing the surface characteristics of aluminum in laser machining processes, thereby benefiting industries such as aerospace, automotive, and electronics.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204805","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}
With the purpose of researching the internal flow stability of the vertical mixed-flow pump device (VMFPD), the entire flow field was solved through the very large-eddy simulation (VLES) k- ω model and the internal flow characteristics of the pump device were quantitatively analyzed with the use of the energy gradient theory (EGT) along with the physical parameters of the flow field. The research elucidates the variety rule of the pressure along the VMFPD and the energy gradient function K as well as the time-frequency features of the pressure pulsation (PP) in the impeller and guide vane. The results demonstrate that the solid wall restriction of the guide vane and the impeller rotation cause a significant shift in the velocity and direction of the water flow. This causes a significant pressure difference between the water bodies, which makes it easier to create an unstable flow. The suction surface of the impeller blade possesses the great concentration of the area with energy gradient function K > 107, which is the critical area influencing the internal flow stability of the pump device.
{"title":"Internal flow stability analysis of vertical mixed-flow pump device based on EGT and FFT","authors":"Xiaoyu Jin, Fan Yang, Shengjie Sun, Rongsheng Xie, Guangxin Zhou, Fangping Tang","doi":"10.1177/09544089241271782","DOIUrl":"https://doi.org/10.1177/09544089241271782","url":null,"abstract":"With the purpose of researching the internal flow stability of the vertical mixed-flow pump device (VMFPD), the entire flow field was solved through the very large-eddy simulation (VLES) k- ω model and the internal flow characteristics of the pump device were quantitatively analyzed with the use of the energy gradient theory (EGT) along with the physical parameters of the flow field. The research elucidates the variety rule of the pressure along the VMFPD and the energy gradient function K as well as the time-frequency features of the pressure pulsation (PP) in the impeller and guide vane. The results demonstrate that the solid wall restriction of the guide vane and the impeller rotation cause a significant shift in the velocity and direction of the water flow. This causes a significant pressure difference between the water bodies, which makes it easier to create an unstable flow. The suction surface of the impeller blade possesses the great concentration of the area with energy gradient function K > 10<jats:sup>7</jats:sup>, which is the critical area influencing the internal flow stability of the pump device.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204804","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 displacement of the positive flow pump is controlled by its pilot hydraulic cylinder. The tracking performance of the pump displacement directly affects the energy saving of the hydraulic excavator through power matching. In this article, a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder is studied to improve the mathematical model for controller design. The concept of relative water hammer is first proposed to describe the relative pressure wave acting on the hydraulic piston to illustrate the mechanism of the nonlinearity. Chaotic motion can be generated by the relative water hammer when the hydraulic piston is in a partial stroke. The mathematical model is derived and its critical parameters are analyzed. The simulation and experimental results verify the existence of the relative water hammer and the effect of each critical parameter on the pilot hydraulic cylinder and the positive flow pump.
{"title":"Study on a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder","authors":"Weiqi Sun, Yong Sang, Lianjie Liao, Luming Jiang, Guoshuai Li, Fuhai Duan","doi":"10.1177/09544089241271864","DOIUrl":"https://doi.org/10.1177/09544089241271864","url":null,"abstract":"The displacement of the positive flow pump is controlled by its pilot hydraulic cylinder. The tracking performance of the pump displacement directly affects the energy saving of the hydraulic excavator through power matching. In this article, a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder is studied to improve the mathematical model for controller design. The concept of relative water hammer is first proposed to describe the relative pressure wave acting on the hydraulic piston to illustrate the mechanism of the nonlinearity. Chaotic motion can be generated by the relative water hammer when the hydraulic piston is in a partial stroke. The mathematical model is derived and its critical parameters are analyzed. The simulation and experimental results verify the existence of the relative water hammer and the effect of each critical parameter on the pilot hydraulic cylinder and the positive flow pump.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226209","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}
Pub Date : 2024-08-28DOI: 10.1177/09544089241274053
Chuanjun Liao, Mingzhao Xu, Wei Da, Hailiang Sun
A low impact docking system with advanced capabilities has been developing for future spacecrafts, and its main interface docking seal (MIDS) is both a critical component and a research topic of interest. It is a typical design for the MIDS that adopts the elastomer seal-on-seal structure made of silicone rubbers, and the atomic oxygen (AO) in space had been found to take great effects on the sealing performance by previous experimental studies, especially for the seal leak, seal adhesion, and compression set. Exposure to AO may cause obvious changes on the sealing surface of the MIDS, and some characteristic parameters of morphology are proposed to characterize the changes in this study, including of the porosity, roughness and radius of curvature. Both the leakage model and the adhesion model of the MIDS are further developed to predict the sealing performance considering AO effects, which had been confirmed by the application experiments. The experimental data are in good agreement with the calculation data. The effects of AO on the sealing performance are simulated and analyzed by the proposed prediction models. The results are beneficial to the developments of the MIDS and other space seals.
目前正在为未来的航天器开发一种具有先进功能的低冲击对接系统，其主界面对接密封件（MIDS）既是一个关键部件，也是一个值得关注的研究课题。MIDS 的典型设计是采用硅橡胶制成的弹性体密封对密封结构，以往的实验研究发现，太空中的原子氧（AO）对密封性能有很大影响，尤其是在密封泄漏、密封粘附和压缩永久变形方面。暴露于 AO 会使 MIDS 的密封面发生明显变化，本研究提出了一些形态特征参数来表征这些变化，包括孔隙率、粗糙度和曲率半径。考虑到 AO 的影响，进一步建立了 MIDS 的泄漏模型和粘附模型，以预测其密封性能。实验数据与计算数据非常吻合。提出的预测模型模拟并分析了 AO 对密封性能的影响。这些结果有利于 MIDS 和其他空间密封件的开发。
{"title":"Prediction models for seal performance of a space seal considering atomic oxygen effects","authors":"Chuanjun Liao, Mingzhao Xu, Wei Da, Hailiang Sun","doi":"10.1177/09544089241274053","DOIUrl":"https://doi.org/10.1177/09544089241274053","url":null,"abstract":"A low impact docking system with advanced capabilities has been developing for future spacecrafts, and its main interface docking seal (MIDS) is both a critical component and a research topic of interest. It is a typical design for the MIDS that adopts the elastomer seal-on-seal structure made of silicone rubbers, and the atomic oxygen (AO) in space had been found to take great effects on the sealing performance by previous experimental studies, especially for the seal leak, seal adhesion, and compression set. Exposure to AO may cause obvious changes on the sealing surface of the MIDS, and some characteristic parameters of morphology are proposed to characterize the changes in this study, including of the porosity, roughness and radius of curvature. Both the leakage model and the adhesion model of the MIDS are further developed to predict the sealing performance considering AO effects, which had been confirmed by the application experiments. The experimental data are in good agreement with the calculation data. The effects of AO on the sealing performance are simulated and analyzed by the proposed prediction models. The results are beneficial to the developments of the MIDS and other space seals.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204803","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}
Advanced industrial processing technique selective laser melting (SLM) can handle various materials. Although titanium alloys are the main material used in SLM, aluminium alloys may be employed in the future. However, producing aluminium alloys is more complicated. This work uses SLM to make an AlSi10Mg solid cylinder. The aim is to study the mechanical properties and microstructure of products. Layer thickness increases defects; thus, research advises avoiding it. The optical microscope study proved the conduction melting process's stability and hole-freeness. EDX mapping and SEM were used to compare the chemical makeup of as-cast and SLM materials. An unusual microstructure showed consistent alloying component distribution. Investigations examine wear, hardness and residual stresses. Extreme hardness was found. The component has evenly distributed compressive residual stresses within material yield limits.
{"title":"Microstructure, wear and residual stresses of selective laser melting AlSi10Mg solid cylinder","authors":"Harinadh Vemanaboina, Ankammarao Padamurthy, Praveen Kumar Gandla, Lakshman Rao Muppa, Koyyagura Lakshmi Kala","doi":"10.1177/09544089241272825","DOIUrl":"https://doi.org/10.1177/09544089241272825","url":null,"abstract":"Advanced industrial processing technique selective laser melting (SLM) can handle various materials. Although titanium alloys are the main material used in SLM, aluminium alloys may be employed in the future. However, producing aluminium alloys is more complicated. This work uses SLM to make an AlSi10Mg solid cylinder. The aim is to study the mechanical properties and microstructure of products. Layer thickness increases defects; thus, research advises avoiding it. The optical microscope study proved the conduction melting process's stability and hole-freeness. EDX mapping and SEM were used to compare the chemical makeup of as-cast and SLM materials. An unusual microstructure showed consistent alloying component distribution. Investigations examine wear, hardness and residual stresses. Extreme hardness was found. The component has evenly distributed compressive residual stresses within material yield limits.","PeriodicalId":20552,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142204819","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：