Pub Date : 2021-02-28DOI: 10.15866/IREASE.V14I1.19310
Jong-Ik Shim
The purpose of this paper is to improve the performance of an aircraft database for a flight simulator. The database for a conventional simulator consists of text files on a disk that is then loaded into the main memory; data is retrieved through search and evaluation processes that do not take into account the characteristics of the aircraft database. To improve database performance, the aircraft database is converted into a C library database that is optimized for search and evaluation. It is used by linking it to the simulator without loading the aircraft database into global memory. To facilitate this process, an automatic C source code generator is designed and implemented, which converts the aircraft database into a C library database. Performance is evaluated by using the C library database in the simulator. The results indicate that the performance is significantly improved compared to the conventional approach.
{"title":"Improving Aircraft Database Performance for Flight Simulator","authors":"Jong-Ik Shim","doi":"10.15866/IREASE.V14I1.19310","DOIUrl":"https://doi.org/10.15866/IREASE.V14I1.19310","url":null,"abstract":"The purpose of this paper is to improve the performance of an aircraft database for a flight simulator. The database for a conventional simulator consists of text files on a disk that is then loaded into the main memory; data is retrieved through search and evaluation processes that do not take into account the characteristics of the aircraft database. To improve database performance, the aircraft database is converted into a C library database that is optimized for search and evaluation. It is used by linking it to the simulator without loading the aircraft database into global memory. To facilitate this process, an automatic C source code generator is designed and implemented, which converts the aircraft database into a C library database. Performance is evaluated by using the C library database in the simulator. The results indicate that the performance is significantly improved compared to the conventional approach.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"27 2 1","pages":"28-38"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89579994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-28DOI: 10.15866/IREASE.V14I1.18829
Nabil L. K. Al-Saffar, Hayder Kraidi Rashid Nasrawi, M. K. Hamza, M. Jabbar
The heat dissipation by fins is very important in many technological systems. The thermal efficiency of fins can be improved depending on many characteristics; one of them is the surface area. This work presents a new fin shapes model used to increase the surface area, keeping the same volume. However, three different fin geometries are used (cylinder, a new fin geometry consisting of cutting cone with hemisphere and an egg (oval) shape fin). A numerical investigation is used to analyze the thermal efficiency of these three types of fins under free convection consideration. The Finite Element Method (FEM) is used as a numerical analysis in order to compute unsteady temperature distribution and heat flux on the surface, based on Ansys Ver.16.1. The new fin shape presented in this study can increase the efficiency by 4%, compared with classical types. The thermal results show that the egg fins have the best thermal efficiency. Moreover, the result is validated and approved by other researchers.
{"title":"Enhancement of Fin Efficiency: a New Proposal","authors":"Nabil L. K. Al-Saffar, Hayder Kraidi Rashid Nasrawi, M. K. Hamza, M. Jabbar","doi":"10.15866/IREASE.V14I1.18829","DOIUrl":"https://doi.org/10.15866/IREASE.V14I1.18829","url":null,"abstract":"The heat dissipation by fins is very important in many technological systems. The thermal efficiency of fins can be improved depending on many characteristics; one of them is the surface area. This work presents a new fin shapes model used to increase the surface area, keeping the same volume. However, three different fin geometries are used (cylinder, a new fin geometry consisting of cutting cone with hemisphere and an egg (oval) shape fin). A numerical investigation is used to analyze the thermal efficiency of these three types of fins under free convection consideration. The Finite Element Method (FEM) is used as a numerical analysis in order to compute unsteady temperature distribution and heat flux on the surface, based on Ansys Ver.16.1. The new fin shape presented in this study can increase the efficiency by 4%, compared with classical types. The thermal results show that the egg fins have the best thermal efficiency. Moreover, the result is validated and approved by other researchers.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"23 2","pages":"20-27"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72620020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-28DOI: 10.15866/IREASE.V14I1.17303
S. Almuradi
This study examines the application of the bifurcation theory to the reduced-order of longitudinal flight dynamic systems. An investigation of steady and unsteady longitudinal aerodynamic coefficients is carried out, including an extended range of pitch up and down reduced frequencies from 0 - 0.06 values. An aircraft with a general delta wing with a 1.5 aspect ratio is chosen for the present analysis. Different elevator control deflection from -28.6 to 0 degrees is used to determine the equilibrium points α and q. The unsteady aerodynamic load results increase the requirements for control power as well as thrust vectoring during pitch up than steady longitudinal one. The flow unsteadiness effect improves the vehicle stability during pitch up corresponding a loosing of it during pitch down. A positive pitch rate is required to point the nose of the fighter. This improvement in pointing will help in the close maneuvering missions.
{"title":"Nonlinear Longitudinal Aerodynamic Analysis at Low Speed Delta Jet Fighter","authors":"S. Almuradi","doi":"10.15866/IREASE.V14I1.17303","DOIUrl":"https://doi.org/10.15866/IREASE.V14I1.17303","url":null,"abstract":"This study examines the application of the bifurcation theory to the reduced-order of longitudinal flight dynamic systems. An investigation of steady and unsteady longitudinal aerodynamic coefficients is carried out, including an extended range of pitch up and down reduced frequencies from 0 - 0.06 values. An aircraft with a general delta wing with a 1.5 aspect ratio is chosen for the present analysis. Different elevator control deflection from -28.6 to 0 degrees is used to determine the equilibrium points α and q. The unsteady aerodynamic load results increase the requirements for control power as well as thrust vectoring during pitch up than steady longitudinal one. The flow unsteadiness effect improves the vehicle stability during pitch up corresponding a loosing of it during pitch down. A positive pitch rate is required to point the nose of the fighter. This improvement in pointing will help in the close maneuvering missions.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"76 1","pages":"8-19"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86176077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-28DOI: 10.15866/IREASE.V14I1.19832
Maisun Ibn Monowar, M. Cho
The CubeSat standard has been envisioned to teach students about satellites from the initial conceptualization to the in-orbit operation. Educational satellite projects have contributed to the creation of skilled workforce and have also advanced spacecraft technology. Unfortunately, educational satellites are not always successful. Design defects in the hardware can be isolated and addressed by running functional checks before launch. On the other hand, software bugs are difficult to identify and may go unidentified months into in-orbit operation. Due to the limited time available for software testing, students cannot spend sufficient time running the satellite software in an operational scenario. While in-orbit software patching is quite a simple and routine task for traditional commercial and government satellite operators, they are uncommon in the CubeSat domain. In this paper, the question of why satellite firmware updates are not very common for educational satellites is addressed. Technical necessities for an upgradable CubeSat are examined for both microcontroller and system-on-a-chip based CubeSats. After comparing both systems, a hybrid system is proposed as a solution for educational CubeSats. A system capable of upgrading the satellite firmware in a single satellite pass is synthesized. It is found out that a roadblock to over-the-air software updates for CubeSats is created not only by the technical aspect, but also by the students’ habit of skipping some engineering practices in their design process. Although their actions may not be critical to the mission success, they are much more important when a maintainable satellite firmware is desired. This paper explores the challenges in upgrading CubeSat flight software in orbit, some possible ways to implement this functionality, demonstration of a method that will allow in-orbit software updates despite having low resources, and a few recommendations for a maintainable satellite software.
{"title":"Over-the-Air Firmware Update for an Educational CubeSat Project","authors":"Maisun Ibn Monowar, M. Cho","doi":"10.15866/IREASE.V14I1.19832","DOIUrl":"https://doi.org/10.15866/IREASE.V14I1.19832","url":null,"abstract":"The CubeSat standard has been envisioned to teach students about satellites from the initial conceptualization to the in-orbit operation. Educational satellite projects have contributed to the creation of skilled workforce and have also advanced spacecraft technology. Unfortunately, educational satellites are not always successful. Design defects in the hardware can be isolated and addressed by running functional checks before launch. On the other hand, software bugs are difficult to identify and may go unidentified months into in-orbit operation. Due to the limited time available for software testing, students cannot spend sufficient time running the satellite software in an operational scenario. While in-orbit software patching is quite a simple and routine task for traditional commercial and government satellite operators, they are uncommon in the CubeSat domain. In this paper, the question of why satellite firmware updates are not very common for educational satellites is addressed. Technical necessities for an upgradable CubeSat are examined for both microcontroller and system-on-a-chip based CubeSats. After comparing both systems, a hybrid system is proposed as a solution for educational CubeSats. A system capable of upgrading the satellite firmware in a single satellite pass is synthesized. It is found out that a roadblock to over-the-air software updates for CubeSats is created not only by the technical aspect, but also by the students’ habit of skipping some engineering practices in their design process. Although their actions may not be critical to the mission success, they are much more important when a maintainable satellite firmware is desired. This paper explores the challenges in upgrading CubeSat flight software in orbit, some possible ways to implement this functionality, demonstration of a method that will allow in-orbit software updates despite having low resources, and a few recommendations for a maintainable satellite software.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"12 1","pages":"39-50"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74423730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-28DOI: 10.15866/IREASE.V14I1.19804
H. Némethová, Dušan Neštrák, A. Čekanová, R. Rozenberg
This article deals with the internal and the external factors that have a significant impact on the air traffic controller student’s cognitive performance and psychomotorical abilities. These factors increase the error rate during the work performance and tests. The article results from the dissertation work of one of the authors, where the individual circadian rhythm of the ATCO workers and ATCO students, and the impact of the external factors on their circadian rhythm have been researched and analyzed. During the research, many of the techniques have been used, but the most important ones are the techniques like brainstorming, measuring the physiological indicators (e.g. body temperature, pulse, systolic and diastolic pressure, reaction time, error rate,...). This article contains theoretical and practical part. The practical section is the empirical part of the theoretical one and it includes statistical analyses of the acquired values from the research. Statistic methods like correlation and Paired t-test were used for evaluating the measured values. The theoretical section covers the analysis of the current state of the problem and the explanation of the statistical methods. The final part of the article involves the evaluation and the conclusion of the research. The evaluation suggests a possible solution for a better education process and management.
{"title":"Internal and External Factors Increasing the Error Rate of ATCO Students’ Performance","authors":"H. Némethová, Dušan Neštrák, A. Čekanová, R. Rozenberg","doi":"10.15866/IREASE.V14I1.19804","DOIUrl":"https://doi.org/10.15866/IREASE.V14I1.19804","url":null,"abstract":"This article deals with the internal and the external factors that have a significant impact on the air traffic controller student’s cognitive performance and psychomotorical abilities. These factors increase the error rate during the work performance and tests. The article results from the dissertation work of one of the authors, where the individual circadian rhythm of the ATCO workers and ATCO students, and the impact of the external factors on their circadian rhythm have been researched and analyzed. During the research, many of the techniques have been used, but the most important ones are the techniques like brainstorming, measuring the physiological indicators (e.g. body temperature, pulse, systolic and diastolic pressure, reaction time, error rate,...). This article contains theoretical and practical part. The practical section is the empirical part of the theoretical one and it includes statistical analyses of the acquired values from the research. Statistic methods like correlation and Paired t-test were used for evaluating the measured values. The theoretical section covers the analysis of the current state of the problem and the explanation of the statistical methods. The final part of the article involves the evaluation and the conclusion of the research. The evaluation suggests a possible solution for a better education process and management.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"4 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76229157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-31DOI: 10.15866/irease.v13i6.18788
F. Ismagilov, V. Vavilov, R. Urazbakhtin, A. Miniyarov, A. Veselov
{"title":"The Influence of External Operating Conditions on the Generator with Amorphous Low-Coercivity Magnetic Core","authors":"F. Ismagilov, V. Vavilov, R. Urazbakhtin, A. Miniyarov, A. Veselov","doi":"10.15866/irease.v13i6.18788","DOIUrl":"https://doi.org/10.15866/irease.v13i6.18788","url":null,"abstract":"","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"6 1","pages":"228"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75773632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.15866/irease.v13i5.17697
S. Szabo, I. Vajdová, E. Jenčová, D. Blasko, R. Rozenberg, B. Mikula
Nowadays, composite materials are often used as construction materials not only in the aviation industry. In general, composite materials mean technical material. Although, they are heterogeneous in their structure, they are understood to be homogeneous. Composites are formed by a composition of at least two chemically and physically different materials. This article deals with fire resistance of composite materials, regularly used in aviation industry. The flammability tests were performed as a part of the project "Simulation of Intervention in Air Accidents," where several materials used in aircraft constructions and interiors were tested. The fire resistance of composite materials is evaluated in the article based on the Maximum Average Rate of Heat Emission (kW/m2). The investigated samples are both of core and core-free sandwich structures. The flammability test was performed on both sides of the sample (smooth and rough). The fire resistance test was performed on the basis of EN 45545.
{"title":"Fire Risk Assessment of Composite Materials in Aviation by Hazard Levels Characterized in Standard EN 45545","authors":"S. Szabo, I. Vajdová, E. Jenčová, D. Blasko, R. Rozenberg, B. Mikula","doi":"10.15866/irease.v13i5.17697","DOIUrl":"https://doi.org/10.15866/irease.v13i5.17697","url":null,"abstract":"Nowadays, composite materials are often used as construction materials not only in the aviation industry. In general, composite materials mean technical material. Although, they are heterogeneous in their structure, they are understood to be homogeneous. Composites are formed by a composition of at least two chemically and physically different materials. This article deals with fire resistance of composite materials, regularly used in aviation industry. The flammability tests were performed as a part of the project \"Simulation of Intervention in Air Accidents,\" where several materials used in aircraft constructions and interiors were tested. The fire resistance of composite materials is evaluated in the article based on the Maximum Average Rate of Heat Emission (kW/m2). The investigated samples are both of core and core-free sandwich structures. The flammability test was performed on both sides of the sample (smooth and rough). The fire resistance test was performed on the basis of EN 45545.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"39 1","pages":"182-188"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82193006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.15866/irease.v13i5.19005
F. Bonfante, P. Maggiore, F. Grimaccia, E. Filippone, M. D. Vedova
A general evolution of airspace and air traffic management is ongoing in Europe including significant novelties for manned aviation. The most important one is the full integration of Remotely Piloted Aircraft Systems (RPAS) in the next future and the full integration of automated air vehicles and Driverless Personal Air Vehicles (DPAV) afterwards with manned aircraft. The economic impact of integration of RPAS with manned aircraft into not segregated airspace to perform aerial work is very important. European and worldwide Aviation Authorities and other organizations (EUROCONTROL, JARUS, RTCA, etc.) are working to elaborate new regulations and standards to maintain the current level of safety of aerial operations facing the incoming new entry in the airspace. The implementation of a comprehensive preliminary risk model is deemed to be propaedeutic to any former safety analysis of the new operational scenario: RPAS and manned aircraft flying together into a not segregated airspace. Such risk model is defined in accordance to the Safety Risk Management Pillar of Safety Management System model. The safety analysis for the implementation of the above mentioned preliminary risk model is presented and discussed in this article.
{"title":"Full Integration of Light RPAS into Not Segregated Airspace: Preliminary Safety Analysis for the Implementation of a Risk Model","authors":"F. Bonfante, P. Maggiore, F. Grimaccia, E. Filippone, M. D. Vedova","doi":"10.15866/irease.v13i5.19005","DOIUrl":"https://doi.org/10.15866/irease.v13i5.19005","url":null,"abstract":"A general evolution of airspace and air traffic management is ongoing in Europe including significant novelties for manned aviation. The most important one is the full integration of Remotely Piloted Aircraft Systems (RPAS) in the next future and the full integration of automated air vehicles and Driverless Personal Air Vehicles (DPAV) afterwards with manned aircraft. The economic impact of integration of RPAS with manned aircraft into not segregated airspace to perform aerial work is very important. European and worldwide Aviation Authorities and other organizations (EUROCONTROL, JARUS, RTCA, etc.) are working to elaborate new regulations and standards to maintain the current level of safety of aerial operations facing the incoming new entry in the airspace. The implementation of a comprehensive preliminary risk model is deemed to be propaedeutic to any former safety analysis of the new operational scenario: RPAS and manned aircraft flying together into a not segregated airspace. Such risk model is defined in accordance to the Safety Risk Management Pillar of Safety Management System model. The safety analysis for the implementation of the above mentioned preliminary risk model is presented and discussed in this article.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"13 1","pages":"165-181"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89299651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.15866/irease.v13i5.18371
V. Triyanti, H. A. Azis, H. Iridiastadi, Y. Yassierli
Air Traffic Control is a work that needs sustained vigilance for a certain period. This condition may result in mental fatigue that can lead to errors or incidents. Facial points could be potential indicators of fatigue that can be used in a real work environment. The objective of this research is to identify the parameters of facial points in order to detect fatigue considering correlation and accuracy value. An Experiment laboratory has been used to capture and recognize five facial points around the eyes of 12 participants when doing moderate and high traffic of simulated Air Traffic Control tasks. Six parameters that are related to movement and fixation of the facial points have been analyzed at five facial points. As a result, among 14 parameters-facial points that have a significant correlation to fatigue, only 4 of them at 2 facial points have good accuracy (>70%) in detecting the increase of fatigue level. Decreasing of movement velocity and increasing of fixation duration of points related to head and eyebrow have been found out when fatigue level increased. It can be concluded that some movement and fixation parameters of facial points are promising to be used in fatigue detection in Air Traffic Control tasks.
{"title":"Facial Movements as Indicators of Fatigue in Air Traffic Control Tasks","authors":"V. Triyanti, H. A. Azis, H. Iridiastadi, Y. Yassierli","doi":"10.15866/irease.v13i5.18371","DOIUrl":"https://doi.org/10.15866/irease.v13i5.18371","url":null,"abstract":"Air Traffic Control is a work that needs sustained vigilance for a certain period. This condition may result in mental fatigue that can lead to errors or incidents. Facial points could be potential indicators of fatigue that can be used in a real work environment. The objective of this research is to identify the parameters of facial points in order to detect fatigue considering correlation and accuracy value. An Experiment laboratory has been used to capture and recognize five facial points around the eyes of 12 participants when doing moderate and high traffic of simulated Air Traffic Control tasks. Six parameters that are related to movement and fixation of the facial points have been analyzed at five facial points. As a result, among 14 parameters-facial points that have a significant correlation to fatigue, only 4 of them at 2 facial points have good accuracy (>70%) in detecting the increase of fatigue level. Decreasing of movement velocity and increasing of fixation duration of points related to head and eyebrow have been found out when fatigue level increased. It can be concluded that some movement and fixation parameters of facial points are promising to be used in fatigue detection in Air Traffic Control tasks.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"70 1","pages":"189-197"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80290642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.15866/irease.v13i5.18805
R. Bielawski, W. Rządkowski, Michał Kowalik, M. Kłonica
Recently, there has been a growing trend towards an ever greater use of composite materials in aircraft structures. This necessitates a search for effective ways of joining these materials. The desirable characteristics of such joints are predominantly high strength and low mass, both of which are features offered by rivet nuts. The study was conducted on one type of glass fabric material, from which two types of composite specimens were prepared. Each specimen used the same type of fibre of the same number of 3 layers, yet of different lay-up. Specimens were joined with aluminium alloy and steel rivet nuts to produce single and multi-row parallel models of riveted joints for further testing and analysis. The specimens were clamped in the grips of tensile machine and subjected to a tensile strength test. In the work, the course of the forces in the rivet nuts joint and the failure modes and effects of joint failure were analysed. The distribution of vertical displacement was examined according to the joint material and two fibre orientation variants. To determine the distribution of displacements, the FE (Finite Element) method was used. Upon completion of the experimental stage, the obtained results were subjected to comparative analysis.
{"title":"Safety of Aircraft Structures in the Context of Composite Element Connection","authors":"R. Bielawski, W. Rządkowski, Michał Kowalik, M. Kłonica","doi":"10.15866/irease.v13i5.18805","DOIUrl":"https://doi.org/10.15866/irease.v13i5.18805","url":null,"abstract":"Recently, there has been a growing trend towards an ever greater use of composite materials in aircraft structures. This necessitates a search for effective ways of joining these materials. The desirable characteristics of such joints are predominantly high strength and low mass, both of which are features offered by rivet nuts. The study was conducted on one type of glass fabric material, from which two types of composite specimens were prepared. Each specimen used the same type of fibre of the same number of 3 layers, yet of different lay-up. Specimens were joined with aluminium alloy and steel rivet nuts to produce single and multi-row parallel models of riveted joints for further testing and analysis. The specimens were clamped in the grips of tensile machine and subjected to a tensile strength test. In the work, the course of the forces in the rivet nuts joint and the failure modes and effects of joint failure were analysed. The distribution of vertical displacement was examined according to the joint material and two fibre orientation variants. To determine the distribution of displacements, the FE (Finite Element) method was used. Upon completion of the experimental stage, the obtained results were subjected to comparative analysis.","PeriodicalId":14462,"journal":{"name":"International Review of Aerospace Engineering","volume":"30 1","pages":"159-164"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85930042","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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