The air intake should be operated at design conditions to achieve a high total pressure recovery and optimum mass capture ratio. The current research focuses on the numerical simulation of the supersonic and hypersonic air inlet and its starting and unstarting characteristics. 2D RANS equation for supersonic and hypersonic intake has been solved using the k-oSST turbulence model. The in-house code and the algorithm based on the RANS equation have also been validated in due process and used for subsequent simulations. The sudden drop in mass capture ratio indicates the unstart condition of the intake. The presence of a bleed section has a commendable effect on the performance parameter of the air intake. A separation bubble was observed at the intake's entrance during the off-design conditions, resulting in performance losses. Four different bleed sections ranging in size from 1.6mm to 8.6mm were used, and simulations with bleed were run for different Mach numbers ranging from 3 to 8. The optimum bleed size of 3mm has been found quite effective in modifying Total pressure recovery within the optimum mass flow rate over the wide range of Mach numbers.
{"title":"Passive flow modification over the supersonic and the hypersonic air-intake system using bleed","authors":"J. Sinha, Sanjay Singh, O. Prakash, D. Panchal","doi":"10.5937/fme2303329s","DOIUrl":"https://doi.org/10.5937/fme2303329s","url":null,"abstract":"The air intake should be operated at design conditions to achieve a high total pressure recovery and optimum mass capture ratio. The current research focuses on the numerical simulation of the supersonic and hypersonic air inlet and its starting and unstarting characteristics. 2D RANS equation for supersonic and hypersonic intake has been solved using the k-oSST turbulence model. The in-house code and the algorithm based on the RANS equation have also been validated in due process and used for subsequent simulations. The sudden drop in mass capture ratio indicates the unstart condition of the intake. The presence of a bleed section has a commendable effect on the performance parameter of the air intake. A separation bubble was observed at the intake's entrance during the off-design conditions, resulting in performance losses. Four different bleed sections ranging in size from 1.6mm to 8.6mm were used, and simulations with bleed were run for different Mach numbers ranging from 3 to 8. The optimum bleed size of 3mm has been found quite effective in modifying Total pressure recovery within the optimum mass flow rate over the wide range of Mach numbers.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91347610","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}
The study applies diverse methods of chaos detection to meteorological variable data (air temperature, relative humidity, surface pressure, precipitation, and wind speed for Ha'il, Saudi Arabia) to understand the nonlinear dynamics and to classify their nature. Additionally, Random Forest Algorithm model is used to predict the precipitation and wind speed. The results obtained by classical and modern approaches are compared. All the variables are found to be chaotic based on correlation dimension, approximate entropy, and 0-1 test. The chaos decision tree algorithm diagnoses air temperature, relative humidity, and wind speed as chaotic, while precipitation and surface pressure are identified as stochastic. This shows that the classical methods are well-validated with the modern methods. Nevertheless, some of them contradict modern methods. The analysis for 32 years of data showed no precipitation for 92% of the time during the entire period based on the Random Forest algorithm.
{"title":"Nonlinear dynamic analysis of meteorological variables for Ha'il region, Saudi Arabia, for the period 1990-2022","authors":"Mohammed Majid, Mohd Nooran, F. Razak","doi":"10.5937/fme2302231m","DOIUrl":"https://doi.org/10.5937/fme2302231m","url":null,"abstract":"The study applies diverse methods of chaos detection to meteorological variable data (air temperature, relative humidity, surface pressure, precipitation, and wind speed for Ha'il, Saudi Arabia) to understand the nonlinear dynamics and to classify their nature. Additionally, Random Forest Algorithm model is used to predict the precipitation and wind speed. The results obtained by classical and modern approaches are compared. All the variables are found to be chaotic based on correlation dimension, approximate entropy, and 0-1 test. The chaos decision tree algorithm diagnoses air temperature, relative humidity, and wind speed as chaotic, while precipitation and surface pressure are identified as stochastic. This shows that the classical methods are well-validated with the modern methods. Nevertheless, some of them contradict modern methods. The analysis for 32 years of data showed no precipitation for 92% of the time during the entire period based on the Random Forest algorithm.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90594188","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}
Shaimaa Kamel, M. Hamzah, Saad Abdulateef, Q. Atiyah
Amputees suffer greatly from lower limb amputation. A novel smart knee joint prosthesis was constructed in this research to allow the amputee to achieve regular daily movement, such as walking, standing, and ascending/descending stairs. This prosthesis employs sensors, actuators, and a mechanical system to replicate the functioning of a natural limb. As a result of the unique mechanical and electrical components employed herein to boost performance, metabolic energy is lowered. Here, a ball screw is employed, which has been determined to be the most efficient means of achieving linear motion; its precision and efficiency range from 90% to 100%. It is quieter and more efficient than a hydraulic or pneumatic system. An electromechanical linear actuator (servo cylinder) is used with an actuator control system and integrated Phase Index - Field-Oriented Control. It maintains and self-calibrates the needed position with high precision when power or backup power is unavailable. The angle of flexion achieved in this design is 120º. The gait analysis revealed that the current prosthesis could imitate the biomechanics of the normal joint with no difficulty at varied speeds when tested on an amputee (110 kg). Furthermore, it may function efficiently as a passive when power is unavailable, including the capacity to move smoothly throughout the swing phase (high accuracy through deceleration and acceleration). The current active knee joint is lightweight (2869 grams), and the cost has been greatly reduced.
{"title":"A novel design of smart knee joint prosthesis for above-knee amputees","authors":"Shaimaa Kamel, M. Hamzah, Saad Abdulateef, Q. Atiyah","doi":"10.5937/fme2302131k","DOIUrl":"https://doi.org/10.5937/fme2302131k","url":null,"abstract":"Amputees suffer greatly from lower limb amputation. A novel smart knee joint prosthesis was constructed in this research to allow the amputee to achieve regular daily movement, such as walking, standing, and ascending/descending stairs. This prosthesis employs sensors, actuators, and a mechanical system to replicate the functioning of a natural limb. As a result of the unique mechanical and electrical components employed herein to boost performance, metabolic energy is lowered. Here, a ball screw is employed, which has been determined to be the most efficient means of achieving linear motion; its precision and efficiency range from 90% to 100%. It is quieter and more efficient than a hydraulic or pneumatic system. An electromechanical linear actuator (servo cylinder) is used with an actuator control system and integrated Phase Index - Field-Oriented Control. It maintains and self-calibrates the needed position with high precision when power or backup power is unavailable. The angle of flexion achieved in this design is 120º. The gait analysis revealed that the current prosthesis could imitate the biomechanics of the normal joint with no difficulty at varied speeds when tested on an amputee (110 kg). Furthermore, it may function efficiently as a passive when power is unavailable, including the capacity to move smoothly throughout the swing phase (high accuracy through deceleration and acceleration). The current active knee joint is lightweight (2869 grams), and the cost has been greatly reduced.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90630412","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}
In the current paper, a CFD simulation study on a pent-roof, spark ignition engine was performed. The scope was to analyze the basic parameters that influence the performances of the simulation: mesh configuration, mesh refinement, turbulence model, and flame wrinkling model parameters. It was used as the OpenFOAM solver for spark ignition engines. The solver was modified by adding the layer addition/removal mechanism for the mesh. Further, a Zeldovich extended NOx model was implemented. Four different mesh configurations were tested with different refinement levels. A set of different turbulence models and initial parameters and different flame wrinkling model parameters were tested. It was observed how all these parameters influence the rate of heat release, cylinder pressure, temperature, the level of turbulent kinetic energy, the flame wrinkling factor, and finally the resulting concentration of nitride monoxide.
{"title":"Influence of mesh and combustion parameters on a spark ignition engine CFD simulation","authors":"T. Senčić, V. Mrzljak, O. Bukovac, Josip Batista","doi":"10.5937/fme2303374s","DOIUrl":"https://doi.org/10.5937/fme2303374s","url":null,"abstract":"In the current paper, a CFD simulation study on a pent-roof, spark ignition engine was performed. The scope was to analyze the basic parameters that influence the performances of the simulation: mesh configuration, mesh refinement, turbulence model, and flame wrinkling model parameters. It was used as the OpenFOAM solver for spark ignition engines. The solver was modified by adding the layer addition/removal mechanism for the mesh. Further, a Zeldovich extended NOx model was implemented. Four different mesh configurations were tested with different refinement levels. A set of different turbulence models and initial parameters and different flame wrinkling model parameters were tested. It was observed how all these parameters influence the rate of heat release, cylinder pressure, temperature, the level of turbulent kinetic energy, the flame wrinkling factor, and finally the resulting concentration of nitride monoxide.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85651620","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}
Inconel 718 is one of the Nickel-based superalloys considered one of the most difficult-to-machine materials owing to its property to retain hardness at higher temperatures. This study examined the performance of Edcutor-based PMEDM machining on Inconel 718. Taguchi L9 OA has been used with current, Pulse-OFF time & Pulse-ON time as process parameters with a delivery side pressure of 6 bar for the Alumina mixed dielectric. Material removal rate (MRR), Tool wear rate (TWR), & surface roughness (SR) have been taken as output responses. The results have been investigated by MADM techniques, namely Taguchi-based Grey Relational Analysis (T-GRA) & TOPSIS analysis. Furthermore, the ranks obtained from T-GRA & TOPSIS have been validated by developing a single layered ANN model. Ranks predicted by the ANN model are the same for T-GRA and TOPSIS and the R-values are 0.924 & 0.871, respectively. ANOVA has also been used to analyze parameter effects on output responses.
{"title":"Multi-response optimization of PMEDM on Inconel 718 using hybrid T-GRA, TOPSIS, and ANN model","authors":"Ram Sai, Jeavudeen Shiek, Shaul Syed","doi":"10.5937/fme2304564r","DOIUrl":"https://doi.org/10.5937/fme2304564r","url":null,"abstract":"Inconel 718 is one of the Nickel-based superalloys considered one of the most difficult-to-machine materials owing to its property to retain hardness at higher temperatures. This study examined the performance of Edcutor-based PMEDM machining on Inconel 718. Taguchi L9 OA has been used with current, Pulse-OFF time & Pulse-ON time as process parameters with a delivery side pressure of 6 bar for the Alumina mixed dielectric. Material removal rate (MRR), Tool wear rate (TWR), & surface roughness (SR) have been taken as output responses. The results have been investigated by MADM techniques, namely Taguchi-based Grey Relational Analysis (T-GRA) & TOPSIS analysis. Furthermore, the ranks obtained from T-GRA & TOPSIS have been validated by developing a single layered ANN model. Ranks predicted by the ANN model are the same for T-GRA and TOPSIS and the R-values are 0.924 & 0.871, respectively. ANOVA has also been used to analyze parameter effects on output responses.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135611751","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}
Mohamed Mohandes, Salman Khan, Shafiqur Rehman, Ali Al-Shaikhi, Bo Liu, Kashif Iqbal
Wind energy has emerged as a potential alternative to traditional energy sources for economical and clean power generation. One important aspect of wind energy generation is the layout design of the wind farm so as to harness maximum energy. Due to its inherent computational complexity, the wind farm layout design problem has traditionally been solved using nature-inspired algorithms. An important issue in nature-inspired algorithms is the termination condition, which governs the execution time of the algorithm. To optimize the execution time, appropriate termination conditions should be employed. This study proposes the concept of a rewarding mechanism to achieve optimization in termination conditions while maintaining the solution quality. The proposed rewarding mechanism, adopted from the stochastic evolution algorithm, is incorporated into a genetic algorithm. The proposed genetic algorithm with the rewarding mechanism (GARM) is empirically tested using real data from a potential wind farm site with different rewarding iterations.
{"title":"GARM: A stochastic evolution based genetic algorithm with rewarding mechanism for wind farm layout optimization","authors":"Mohamed Mohandes, Salman Khan, Shafiqur Rehman, Ali Al-Shaikhi, Bo Liu, Kashif Iqbal","doi":"10.5937/fme2304575m","DOIUrl":"https://doi.org/10.5937/fme2304575m","url":null,"abstract":"Wind energy has emerged as a potential alternative to traditional energy sources for economical and clean power generation. One important aspect of wind energy generation is the layout design of the wind farm so as to harness maximum energy. Due to its inherent computational complexity, the wind farm layout design problem has traditionally been solved using nature-inspired algorithms. An important issue in nature-inspired algorithms is the termination condition, which governs the execution time of the algorithm. To optimize the execution time, appropriate termination conditions should be employed. This study proposes the concept of a rewarding mechanism to achieve optimization in termination conditions while maintaining the solution quality. The proposed rewarding mechanism, adopted from the stochastic evolution algorithm, is incorporated into a genetic algorithm. The proposed genetic algorithm with the rewarding mechanism (GARM) is empirically tested using real data from a potential wind farm site with different rewarding iterations.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135612321","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}
Shashi Chichkhede, D. Mahapatra, Shubhashis Sanyal, Shubhankar Bhowmick
The present work reports the static behaviour of functionally graded rotating beam based on Timoshenko beam theory, which includes the effect of shear deformation. The principle of virtual displacement is applied to derive a governing equation for the functionally graded (FG) rotating beam, considering the centrifugal stiffening effect. The B-spline collocation technique is employed to solve the differential equation and material properties are function of power law distribution. The effect of material power index and rotational speed on the static characteristics of functionally graded rotating cantilever beams has been investigated for two different slenderness ratios. The obtained results demonstrate the beam deflection and the beam normal and shear stresses for the power gradient and rotational speed values. The results help to conclude that material gradation can be utilized to improve the functioning of the rotating structures such as helicopter rotor, aircraft propellers, windmill blades etc.
{"title":"Static behaviour of functionally graded rotating cantilever beams using B-spline collocation technique","authors":"Shashi Chichkhede, D. Mahapatra, Shubhashis Sanyal, Shubhankar Bhowmick","doi":"10.5937/fme2303347c","DOIUrl":"https://doi.org/10.5937/fme2303347c","url":null,"abstract":"The present work reports the static behaviour of functionally graded rotating beam based on Timoshenko beam theory, which includes the effect of shear deformation. The principle of virtual displacement is applied to derive a governing equation for the functionally graded (FG) rotating beam, considering the centrifugal stiffening effect. The B-spline collocation technique is employed to solve the differential equation and material properties are function of power law distribution. The effect of material power index and rotational speed on the static characteristics of functionally graded rotating cantilever beams has been investigated for two different slenderness ratios. The obtained results demonstrate the beam deflection and the beam normal and shear stresses for the power gradient and rotational speed values. The results help to conclude that material gradation can be utilized to improve the functioning of the rotating structures such as helicopter rotor, aircraft propellers, windmill blades etc.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74059372","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}
The inlet is designed to compress the air and increase static pressure. In the present work, analyses have been carried out using 2D axisymmetric Reynolds averaged Navier Stokes equations (RANS) equations to capture the flow physics of the shock structure produced by the multi-row disk inlet device at different semi-cone angles. The present work involves numerical studies on the shock structure over the disk. Drag coefficient, pressure variation, and vortex behavior with separation layers have been observed with various semi-cone angles of 12°, 15°, and 20° at the steady-state condition and zero angles of attack. At the free stream Mach number 2 and turbulence model k-o SST, simulations have been carried out using commercial software. Compression through the cavity structure and the drag coefficient analysis at 20° shows better trade-off performance than the others. We also obtained that 20° is the maximum semi-cone angle for the current disk set-up and the operating conditions.
{"title":"Design optimization of a multi row disk inlet device with an optimum nose cone angle","authors":"J. Sinha, Sanjay Singh, O. Prakash, D. Panchal","doi":"10.5937/fme2301023s","DOIUrl":"https://doi.org/10.5937/fme2301023s","url":null,"abstract":"The inlet is designed to compress the air and increase static pressure. In the present work, analyses have been carried out using 2D axisymmetric Reynolds averaged Navier Stokes equations (RANS) equations to capture the flow physics of the shock structure produced by the multi-row disk inlet device at different semi-cone angles. The present work involves numerical studies on the shock structure over the disk. Drag coefficient, pressure variation, and vortex behavior with separation layers have been observed with various semi-cone angles of 12°, 15°, and 20° at the steady-state condition and zero angles of attack. At the free stream Mach number 2 and turbulence model k-o SST, simulations have been carried out using commercial software. Compression through the cavity structure and the drag coefficient analysis at 20° shows better trade-off performance than the others. We also obtained that 20° is the maximum semi-cone angle for the current disk set-up and the operating conditions.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81062749","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}
Robot-based compact storage and retrieval systems (RCS/RS) are fully automatic storage systems operated by robots from above. Therein, goods are stored in plastic bins stacked on each other, resulting in a 'Last-In-First-Out' storage strategy within each stack. This ensures very high degrees of space utilization. If containers located further down the stack are required, the robots relocate those stored above the required one. RCS/R-systems can typically be found in e-commerce, the pharmaceutical industry, and food or spare parts trade. Besides the system parameters, many other factors, such as the number of robots or the grid size, influence the system's behavior. This paper focuses on the system's throughput and the optimum number of operating robots. A discrete event simulation (DES) in the SIMIO simulation program gained insights into design variants and operating modes.
基于机器人的紧凑型存储和检索系统(RCS/RS)是由机器人从上面操作的全自动存储系统。在这种情况下，货物被储存在塑料箱中，一个叠一个，形成了“后进先出”的存储策略。这确保了非常高的空间利用率。如果需要放置在堆栈较低位置的容器，机器人将重新安置存储在所需容器上方的容器。RCS/ r -系统通常可以在电子商务、制药行业、食品或备件贸易中找到。除了系统参数之外，许多其他因素，如机器人的数量或网格大小，也会影响系统的行为。本文重点研究了系统的吞吐量和操作机器人的最佳数量。SIMIO仿真程序中的离散事件仿真(DES)获得了对设计变体和操作模式的见解。
{"title":"Simulation study of RCS/R-systems with several robots serving one picking station","authors":"Philipp Trost, Georg Karting, Michael Eder","doi":"10.5937/fme2302201t","DOIUrl":"https://doi.org/10.5937/fme2302201t","url":null,"abstract":"Robot-based compact storage and retrieval systems (RCS/RS) are fully automatic storage systems operated by robots from above. Therein, goods are stored in plastic bins stacked on each other, resulting in a 'Last-In-First-Out' storage strategy within each stack. This ensures very high degrees of space utilization. If containers located further down the stack are required, the robots relocate those stored above the required one. RCS/R-systems can typically be found in e-commerce, the pharmaceutical industry, and food or spare parts trade. Besides the system parameters, many other factors, such as the number of robots or the grid size, influence the system's behavior. This paper focuses on the system's throughput and the optimum number of operating robots. A discrete event simulation (DES) in the SIMIO simulation program gained insights into design variants and operating modes.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80418087","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}
Due to the sudden nature of hull girder collapse caused by extreme loadings, the ultimate strength of ships, i.e., ultimate capacity, has to be evaluated. Ultimate strength analysis procedures have already been provided within the rules of the classification societies for sea-going ships. However, rules for inland vessels are not fully addressing the issue. In addition, literature data on the ultimate strength of inland vessels are almost negligible, which is alarming, considering the frequency of grounding and overloading events in inland navigation. Moreover, inland vessels' structural elements are prone to buckling due to their slender plates. In order to evaluate ultimate strength, an inland waterway (IW) barge is chosen for progressive collapse analysis (PCA) employment. PCA has demonstrated that the buckling collapse of structural elements vastly governs a vessel's ultimate capacity. Results show the extent of the safety zone between the actual loss of the ultimate capacity and the linear-elastic behavior of the structure.
{"title":"On ultimate strength of an inland waterway barge","authors":"Nemanja Ilić, N. Momčilović","doi":"10.5937/fme2301090i","DOIUrl":"https://doi.org/10.5937/fme2301090i","url":null,"abstract":"Due to the sudden nature of hull girder collapse caused by extreme loadings, the ultimate strength of ships, i.e., ultimate capacity, has to be evaluated. Ultimate strength analysis procedures have already been provided within the rules of the classification societies for sea-going ships. However, rules for inland vessels are not fully addressing the issue. In addition, literature data on the ultimate strength of inland vessels are almost negligible, which is alarming, considering the frequency of grounding and overloading events in inland navigation. Moreover, inland vessels' structural elements are prone to buckling due to their slender plates. In order to evaluate ultimate strength, an inland waterway (IW) barge is chosen for progressive collapse analysis (PCA) employment. PCA has demonstrated that the buckling collapse of structural elements vastly governs a vessel's ultimate capacity. Results show the extent of the safety zone between the actual loss of the ultimate capacity and the linear-elastic behavior of the structure.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91300137","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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