This research employs a series of machine learning methods to predict the direction of lane change. The response is a binary variable indicating changing the lane to the left or to the right. The employed methods include Decision Tree, Discriminant Analysis, Naïve Bayes, Support Vector Machine, k-Nearest Neighbour and Ensemble. The results are compared to the conventional logistic regression method. Both performance criteria and computational times are reported for comparison purposes. A design of experiments is run to test 25 classification methods at ratios of 25%, 50%, and 75% right to left lane change data. Moreover, samples are validated by cross and holdback validation methods. RUSBoosted trees, an ensemble method, shows improvement over logistic regression. This research provides valuable insights on lane change behaviour, including trajectories and driving styles, which falls into the field of microscopic lane change study.
{"title":"DIRECTIONAL LANE CHANGE PREDICTION USING MACHINE LEARNING METHODS","authors":"M. Ardakani, Timothy M. Bonds","doi":"10.5937/jaes0-40553","DOIUrl":"https://doi.org/10.5937/jaes0-40553","url":null,"abstract":"\u0000This research employs a series of machine learning methods to predict the direction of lane change. The response is a binary variable indicating changing the lane to the left or to the right. The employed methods include Decision Tree, Discriminant Analysis, Naïve Bayes, Support Vector Machine, k-Nearest Neighbour and Ensemble. The results are compared to the conventional logistic regression method. Both performance criteria and computational times are reported for comparison purposes. A design of experiments is run to test 25 classification methods at ratios of 25%, 50%, and 75% right to left lane change data. Moreover, samples are validated by cross and holdback validation methods. RUSBoosted trees, an ensemble method, shows improvement over logistic regression. This research provides valuable insights on lane change behaviour, including trajectories and driving styles, which falls into the field of microscopic lane change study.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72529275","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}
Jeanisson Cesar Mariano Silva, Jorge Ferreira, P. Muterlle, Douglas Sousa
The use of concrete in the construction industry is widespread throughout the world, which increases the need for a better characterization of its technical aspects. In particular, there is a need for a better understanding of its poor performance when subjected to dynamic loads, which occurs due to its great stiffness and its little (if any) deformation capacity. Knowing that one of the ways to mitigate the poor behavior of concrete in case of dynamic loads is by improving the deformation capacity or ductility of the metallic reinforcement, the proposal to explore the behavior of a concrete beam reinforced with metallic rebars produced from a pseudo-elastic Nickel-Titanium alloy becomes highly desirable. This experimental research aims to verify the flexural behavior of a concrete beam reinforced with Nickel-Titanium rebars. In this regard, the requirements suggested by the technical standard in force were carefully followed, relying mainly on the international standard ASTM C78. Concrete specimens were produced either reinforced with conventional steel rebars; or reinforced with Nickel-Titanium rebars. The results showed that, although the Nickel-Titanium rebars specimens presented a modulus of rupture 26.48% lower, their displacement was about 642.79% greater in relation to specimens with conventional steel rebars, in addition to presenting a partial recovery of the beam's initial position even after complete concrete breakage.
{"title":"FLEXURAL BEHAVIOR OF A CONCRETE BEAM REINFORCED WITH METAL REBARS PRODUCED FROM A PSEUDO-ELASTIC NICKEL-TITANIUM ALLOY","authors":"Jeanisson Cesar Mariano Silva, Jorge Ferreira, P. Muterlle, Douglas Sousa","doi":"10.5937/jaes0-38927","DOIUrl":"https://doi.org/10.5937/jaes0-38927","url":null,"abstract":"The use of concrete in the construction industry is widespread throughout the world, which increases the need for a better characterization of its technical aspects. In particular, there is a need for a better understanding of its poor performance when subjected to dynamic loads, which occurs due to its great stiffness and its little (if any) deformation capacity. Knowing that one of the ways to mitigate the poor behavior of concrete in case of dynamic loads is by improving the deformation capacity or ductility of the metallic reinforcement, the proposal to explore the behavior of a concrete beam reinforced with metallic rebars produced from a pseudo-elastic Nickel-Titanium alloy becomes highly desirable. This experimental research aims to verify the flexural behavior of a concrete beam reinforced with Nickel-Titanium rebars. In this regard, the requirements suggested by the technical standard in force were carefully followed, relying mainly on the international standard ASTM C78. Concrete specimens were produced either reinforced with conventional steel rebars; or reinforced with Nickel-Titanium rebars. The results showed that, although the Nickel-Titanium rebars specimens presented a modulus of rupture 26.48% lower, their displacement was about 642.79% greater in relation to specimens with conventional steel rebars, in addition to presenting a partial recovery of the beam's initial position even after complete concrete breakage.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77176588","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}
N. Karsakova, K. Sherov, B. Donenbayev, D. Abulkhairov, I. Sagynganova, M. Usserbayev, I. Teliman, Aibek Sherov, G. Tussupbekova
A method for simultaneous processing of stepped holes in the bedding of a submersible pump and the boring bar design is proposed. The results of the study of existing methods for processing stepped holes and the design of boring tools are presented. It was revealed that the considered methods and designs of tools cannot be used for processing stepped holes in the submersible pump frame. The calculation of the developed design of the boring bar for static stiffness and strength, as well as the calculation of the stress-strain state (SSS) of the cutting plates by the finite element method using the ANSYS program, was carried out. The purpose of calculating the boring bar for static stiffness is a finite element study of the radial displacement of the boring bar cutter plates in the process of machining a stepped hole. As a result, the value of deformation in the axial and radial directions, which occur at the top of the cutting plate, is established. Also, the values of the cantilever overhang of the boring cutters are established, under which the conditions for the static rigidity of the boring bar are met. Taking into account the obtained results, the boring bar design was optimized.
{"title":"CALCULATION OF THE BORING BAR DESIGN FOR STATIC RIGIDITY AND STRENGTH WITH SIMULTANEOUS BORING OF A STEPPED HOLE WITH FURTHER OPTIMIZATION","authors":"N. Karsakova, K. Sherov, B. Donenbayev, D. Abulkhairov, I. Sagynganova, M. Usserbayev, I. Teliman, Aibek Sherov, G. Tussupbekova","doi":"10.5937/jaes0-40340","DOIUrl":"https://doi.org/10.5937/jaes0-40340","url":null,"abstract":"A method for simultaneous processing of stepped holes in the bedding of a submersible pump and the boring bar design is proposed. The results of the study of existing methods for processing stepped holes and the design of boring tools are presented. It was revealed that the considered methods and designs of tools cannot be used for processing stepped holes in the submersible pump frame. The calculation of the developed design of the boring bar for static stiffness and strength, as well as the calculation of the stress-strain state (SSS) of the cutting plates by the finite element method using the ANSYS program, was carried out. The purpose of calculating the boring bar for static stiffness is a finite element study of the radial displacement of the boring bar cutter plates in the process of machining a stepped hole. As a result, the value of deformation in the axial and radial directions, which occur at the top of the cutting plate, is established. Also, the values of the cantilever overhang of the boring cutters are established, under which the conditions for the static rigidity of the boring bar are met. Taking into account the obtained results, the boring bar design was optimized.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88088137","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}
This work investigates the bulk resistivity, and the stress-strain relationship of polarized cement paste as indicators of its electromechanical properties. The polarizing of the cement paste specimens was achieved by applying a uniform direct current (DC) electric field through the fresh cement paste for 24 hours. A total of 24 specimens were prepared for this study, 7 of them were not cured under the effect of the DC electric field to serve as reference. 3 different electrical field values were utilized in this experiment, namely: 100 V.m-1, 200 V.m-1, and 500 V.m-1. 2 types of water were used for mixing the cement paste, namely: tap (T), and deionized (DI). The bulk resistivity values were measured in the direction parallel to the polarization, and the two other directions perpendicular to the polarization. The T water specimens were tested under uniaxial compression on the axis of polarization. The results show that the bulk resistivity of the specimens was increased as the curing electrical field increased. Mixing with T water also increased the bulk resistivity when compared to mixing with DI water. Polarizing the fresh cement paste has a significant effect on its mechanical properties such that the ultimate compressive strength decreased by 50%, and the failure strain increased by 500%. In addition, the polarized specimens showed some changes in its morphology when compared with the reference.
本文研究了极化水泥浆体的体积电阻率和应力应变关系作为其机电性能的指标。在新鲜的水泥浆体上施加均匀的直流电场24小时，实现了水泥浆体试样的极化。本研究共制备了24个试件，其中7个试件在直流电场作用下未固化，作为参考。本实验采用3种不同的电场值，分别为:100 vm -1、200 vm -1和500 vm -1。水泥浆混合使用2种水，即自来水(T)和去离子水(DI)。在平行于极化方向和垂直于极化方向测量体电阻率值。水样在极化轴上进行单轴压缩试验。结果表明:试件的体电阻率随固化电场的增大而增大;与与DI水混合相比，与T水混合也增加了体电阻率。极化对鲜水泥浆体的力学性能有显著影响，其极限抗压强度降低50%，破坏应变增加500%。此外，极化后的样品形貌与参考样品相比也有一定的变化。
{"title":"ELECTROMECHANICAL PROPERTIES OF SELF-SENSING CEMENT PASTES POLARIZED WHILE FRESH","authors":"Mohammad Al-Qaralleh","doi":"10.5937/jaes0-40435","DOIUrl":"https://doi.org/10.5937/jaes0-40435","url":null,"abstract":"This work investigates the bulk resistivity, and the stress-strain relationship of polarized cement paste as indicators of its electromechanical properties. The polarizing of the cement paste specimens was achieved by applying a uniform direct current (DC) electric field through the fresh cement paste for 24 hours. A total of 24 specimens were prepared for this study, 7 of them were not cured under the effect of the DC electric field to serve as reference. 3 different electrical field values were utilized in this experiment, namely: 100 V.m-1, 200 V.m-1, and 500 V.m-1. 2 types of water were used for mixing the cement paste, namely: tap (T), and deionized (DI). The bulk resistivity values were measured in the direction parallel to the polarization, and the two other directions perpendicular to the polarization. The T water specimens were tested under uniaxial compression on the axis of polarization. The results show that the bulk resistivity of the specimens was increased as the curing electrical field increased. Mixing with T water also increased the bulk resistivity when compared to mixing with DI water. Polarizing the fresh cement paste has a significant effect on its mechanical properties such that the ultimate compressive strength decreased by 50%, and the failure strain increased by 500%. In addition, the polarized specimens showed some changes in its morphology when compared with the reference.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89086821","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}
Q. Hassan, Hayder A. Alalwan, M. Mohammed, M. Mohammed
This work aims to investigate the influence of blending diesel fuel with different percentages of methyl alcohol on reducing the emission of exhaust gases. The study was performed using a laboratory diesel engine, which is an internal combustion, single-cylinder, and four-strokes engine. The study involved investigating three volume percentages of methyl alcohol (methanol), which are 7, 14, and 21. The emission results of the blending fuels were compared with that of non-blending fuel. The analysis of the exhaust gases was done under three engine loads, which are two, four, and six N.m, with a constant speed of 2000 rpm. The analysis involves measuring carbon oxides (CO and CO2), unburned hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM). The results showed a positive impact of methanol on reducing the emission of all gases except NOx. Increasing the methanol ratio increases the reduction of the emissions of CO, CO2, PM, and HC, where the highest reductions of the gaseous emissions were observed with the percentage of 21% of methanol under all engine loads. Specifically, the drop recorded by using 21% of methanol was 69-83% for CO, 60-69% for CO2, 80-83% for HC, and 25-30% for PM. These reductions in emissions are assigned to the high oxygen content of methyl alcohol that influences the complete combustion of diesel. On the other hand, the NOx emission increased by 135-346%, but a possible reduction in these emissions can be achieved through a proper engine modification. The results of this investigation provide essential insights that would inspire using methanol as a fuel additive with modifying the diesel engines to be compatible with blending fuel.
{"title":"IDENTIFYING THE IMPACT OF METHANOL-DIESEL FUEL ON THE ENVIRONMENT USING A FOUR-STROKE CI ENGINE","authors":"Q. Hassan, Hayder A. Alalwan, M. Mohammed, M. Mohammed","doi":"10.5937/jaes0-39809","DOIUrl":"https://doi.org/10.5937/jaes0-39809","url":null,"abstract":"This work aims to investigate the influence of blending diesel fuel with different percentages of methyl alcohol on reducing the emission of exhaust gases. The study was performed using a laboratory diesel engine, which is an internal combustion, single-cylinder, and four-strokes engine. The study involved investigating three volume percentages of methyl alcohol (methanol), which are 7, 14, and 21. The emission results of the blending fuels were compared with that of non-blending fuel. The analysis of the exhaust gases was done under three engine loads, which are two, four, and six N.m, with a constant speed of 2000 rpm. The analysis involves measuring carbon oxides (CO and CO2), unburned hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM). The results showed a positive impact of methanol on reducing the emission of all gases except NOx. Increasing the methanol ratio increases the reduction of the emissions of CO, CO2, PM, and HC, where the highest reductions of the gaseous emissions were observed with the percentage of 21% of methanol under all engine loads. Specifically, the drop recorded by using 21% of methanol was 69-83% for CO, 60-69% for CO2, 80-83% for HC, and 25-30% for PM. These reductions in emissions are assigned to the high oxygen content of methyl alcohol that influences the complete combustion of diesel. On the other hand, the NOx emission increased by 135-346%, but a possible reduction in these emissions can be achieved through a proper engine modification. The results of this investigation provide essential insights that would inspire using methanol as a fuel additive with modifying the diesel engines to be compatible with blending fuel. ","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83699369","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}
Mohammed Haiek, Yassine Lakhal, Nabil Ben Said Amrani, Youness El Ansari, D. Sarsri
This paper aims to establish a metamodel for predicting the mechanical behavior of bolted structures with elastic parts, regardless the changes in input parameters from a set of simulation data. First, we collect information from a parametric analysis based on numerical finite element simulation tests. Then, the metamodel is built using the radial spline basis function method. Following that, an iterative fitting process based on the metamodel-simulation coupling is used to improve the model’s fidelity. Finally, the metamodel is validated by comparing and analysing the error rate between the metamodel and the simulation in order to reduce the computation time towards 2 seconds.
{"title":"DEVELOPMENT OF A PREDICTION MODEL FOR THE BEHAVIOR OF BOLTED STRUCTURE WITH AN ELASTIC PART JOINT BASED ON METAMODEL APPROACH","authors":"Mohammed Haiek, Yassine Lakhal, Nabil Ben Said Amrani, Youness El Ansari, D. Sarsri","doi":"10.5937/jaes0-40064","DOIUrl":"https://doi.org/10.5937/jaes0-40064","url":null,"abstract":"This paper aims to establish a metamodel for predicting the mechanical behavior of bolted structures with elastic parts, regardless the changes in input parameters from a set of simulation data. First, we collect information from a parametric analysis based on numerical finite element simulation tests. Then, the metamodel is built using the radial spline basis function method. Following that, an iterative fitting process based on the metamodel-simulation coupling is used to improve the model’s fidelity. Finally, the metamodel is validated by comparing and analysing the error rate between the metamodel and the simulation in order to reduce the computation time towards 2 seconds.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83255098","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}
Alejandro Ruiz Sánchez, Jorge Andrés Sierra Del Rio, Edwin Correa Quintana, D. Sanín-Villa
The generated kinetic energy of a water vortex can be transformed into electrical energy by a Gravitational Water Vortex Power Plant. Which is a new and green alternative for a conventional power plant that can induce/create a vortex without great civil construction. Previous studies focus their objective on tank design and vortex formation inside it (to study the fluid outlet velocity). However, the rotor design is a parameter that affects directly in turbine performance. The main purpose of this study is to compare numerically with the Ansys software the Savonius turbine as a Gravitational Vortex turbine rotor with the standard rotor (straight blades). The study showed that the straight-bladed rotor performed better with a generated torque of approximately 1.1 Nm, compared to 0.6 Nm generated by the Savonius. In conclusion, it was shown that the design of the rotor for the gravitational vortex turbine considerably affects its performance, where it can be increased or decreased by up to 30% difference.
{"title":"NUMERICAL COMPARISON OF SAVONIUS TURBINE AS A ROTOR FOR GRAVITATIONAL VORTEX TURBINE WITH STANDARD ROTOR","authors":"Alejandro Ruiz Sánchez, Jorge Andrés Sierra Del Rio, Edwin Correa Quintana, D. Sanín-Villa","doi":"10.5937/jaes0-39847","DOIUrl":"https://doi.org/10.5937/jaes0-39847","url":null,"abstract":"The generated kinetic energy of a water vortex can be transformed into electrical energy by a Gravitational Water Vortex Power Plant. Which is a new and green alternative for a conventional power plant that can induce/create a vortex without great civil construction. Previous studies focus their objective on tank design and vortex formation inside it (to study the fluid outlet velocity). However, the rotor design is a parameter that affects directly in turbine performance. The main purpose of this study is to compare numerically with the Ansys software the Savonius turbine as a Gravitational Vortex turbine rotor with the standard rotor (straight blades). The study showed that the straight-bladed rotor performed better with a generated torque of approximately 1.1 Nm, compared to 0.6 Nm generated by the Savonius. In conclusion, it was shown that the design of the rotor for the gravitational vortex turbine considerably affects its performance, where it can be increased or decreased by up to 30% difference.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88928997","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}
One of the major infrastructure development programs of the Indonesian government is the construction of toll roads, such as the Trans-Central Java toll road. The construction of these toll roads subsequently affects various aspects of the country, including the capacity and performance of the national road network. However, the government needs to analyze the effect of the toll road network on the performance of the national road network both in the existing and the coming years. Therefore, this study aims to determine the effect of the Trans Java toll road network on the performance of national roads. The study area used was the Central Java Province with a specific focus on toll roads and national roads. The analysis was processed on the EMME/3 software to form a road network with Gravity Model. The findings showed that the largest movement between 2022 and 2048 is in internal zones. It was also discovered that the Volume-Capacity Ratio value of the road network in 2022 was stable while 512 roads were projected to be unstable in 2048. Moreover, the average travel speed on national road sections in 2022 with toll roads was found to be stable up to 2030 but the speeds started reducing from 2035 to 2048 where the value was recorded to be less than 40 km/hour.
{"title":"The effect of toll road operation on national road performance in Central Java province","authors":"W. Hermani, A. Setyawan, S. Syafi","doi":"10.5937/jaes0-43041","DOIUrl":"https://doi.org/10.5937/jaes0-43041","url":null,"abstract":"One of the major infrastructure development programs of the Indonesian government is the construction of toll roads, such as the Trans-Central Java toll road. The construction of these toll roads subsequently affects various aspects of the country, including the capacity and performance of the national road network. However, the government needs to analyze the effect of the toll road network on the performance of the national road network both in the existing and the coming years. Therefore, this study aims to determine the effect of the Trans Java toll road network on the performance of national roads. The study area used was the Central Java Province with a specific focus on toll roads and national roads. The analysis was processed on the EMME/3 software to form a road network with Gravity Model. The findings showed that the largest movement between 2022 and 2048 is in internal zones. It was also discovered that the Volume-Capacity Ratio value of the road network in 2022 was stable while 512 roads were projected to be unstable in 2048. Moreover, the average travel speed on national road sections in 2022 with toll roads was found to be stable up to 2030 but the speeds started reducing from 2035 to 2048 where the value was recorded to be less than 40 km/hour.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","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":"82680623","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}
It is necessary for the ship to have the capability of maneuvering when it is operating out at sea in order to protect the ship from the risk of colliding with other objects. To increase maneuverability, it is proposed to deploy interceptor devices on the two sides of the ship's stern, where the height of the interceptor blades can be adjusted. The working principle is to restrict the flow of fluid on one side at the stern in order to generate greater pressure than the other side, so that the fluid flowing towards the stern of the ship experiences a high-speed difference between one side and the other, resulting in an increase in side force. In this paper, the open free-running test method is used to test the interceptor's ability to turn on a model of a fast ship. The ship model is fitted with a GPS device, a control system, a motor, and a communication system. The case study of the interceptor mounted on two distinct sides at the ship's stern is conducted with various combinations of interceptor blade height (d) between the two sides, including 100% d, 50% d, and 0% d. The test findings consist of model trajectory, velocity, and an IMO standard maneuver. The combination of 100% d at portside, 0% d at starboard side, and the rudder pointing portside at 35 degrees angle resulted in the best tactical diameter, which is 21.49% smaller than without the interceptor.
{"title":"Interceptor's effect on turning maneuver performance with open free running model test method","authors":"M. Hafiz, A. Sulisetyono","doi":"10.5937/jaes0-42646","DOIUrl":"https://doi.org/10.5937/jaes0-42646","url":null,"abstract":"It is necessary for the ship to have the capability of maneuvering when it is operating out at sea in order to protect the ship from the risk of colliding with other objects. To increase maneuverability, it is proposed to deploy interceptor devices on the two sides of the ship's stern, where the height of the interceptor blades can be adjusted. The working principle is to restrict the flow of fluid on one side at the stern in order to generate greater pressure than the other side, so that the fluid flowing towards the stern of the ship experiences a high-speed difference between one side and the other, resulting in an increase in side force. In this paper, the open free-running test method is used to test the interceptor's ability to turn on a model of a fast ship. The ship model is fitted with a GPS device, a control system, a motor, and a communication system. The case study of the interceptor mounted on two distinct sides at the ship's stern is conducted with various combinations of interceptor blade height (d) between the two sides, including 100% d, 50% d, and 0% d. The test findings consist of model trajectory, velocity, and an IMO standard maneuver. The combination of 100% d at portside, 0% d at starboard side, and the rudder pointing portside at 35 degrees angle resulted in the best tactical diameter, which is 21.49% smaller than without the interceptor.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","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":"78241785","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}
Ultra-high-performance concrete (UHPC) differs in its structural behavior from conventional concrete due to its high compressive and tensile strength, stiffness, toughness, and durability. Therefore, UHPC needs an appropriate constitutive model to simulate its mechanical properties in finite element analysis. In this study, numerical models were developed to trace the structural behavior of UHPC beams upon loading since beam behavior depends on the constituents' response to compression and tension. New numerical models were formulated to display the stress-strain relationships of UHPC in compression and tension by adopting a new methodology that depended on actual results. The compressive stress-strain relationship included two portions; the ascending one for elastic and strain hardening up to compressive strength and a descending curve for the strain-softening until a 0.0062 strain. A linear elastic tensile stress-strain relation was applied until tensile strength. A tri-linear relationship was applied for stiffness degradation and crack propagation upon debonding fibers from the matrix until fracture. These numerical models were used in Abaqus software to simulate the UHPC beam behavior. The developed models were verified and proved for beams' behavior in flexure and shear. The results indicated that the models could predict UHPC beams' response throughout the entire loading until failure.
{"title":"Numerical simulation of ultra-high-performance concrete's compressive and tensile behaviour in beams","authors":"A. Jabbar, L. Danha, Qais F. Hasan","doi":"10.5937/jaes0-40769","DOIUrl":"https://doi.org/10.5937/jaes0-40769","url":null,"abstract":"Ultra-high-performance concrete (UHPC) differs in its structural behavior from conventional concrete due to its high compressive and tensile strength, stiffness, toughness, and durability. Therefore, UHPC needs an appropriate constitutive model to simulate its mechanical properties in finite element analysis. In this study, numerical models were developed to trace the structural behavior of UHPC beams upon loading since beam behavior depends on the constituents' response to compression and tension. New numerical models were formulated to display the stress-strain relationships of UHPC in compression and tension by adopting a new methodology that depended on actual results. The compressive stress-strain relationship included two portions; the ascending one for elastic and strain hardening up to compressive strength and a descending curve for the strain-softening until a 0.0062 strain. A linear elastic tensile stress-strain relation was applied until tensile strength. A tri-linear relationship was applied for stiffness degradation and crack propagation upon debonding fibers from the matrix until fracture. These numerical models were used in Abaqus software to simulate the UHPC beam behavior. The developed models were verified and proved for beams' behavior in flexure and shear. The results indicated that the models could predict UHPC beams' response throughout the entire loading until failure.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","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":"74459322","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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