This paper is based on the authors’ many years of experience in teaching, organizing special courses and one-day workshops for different groups of students, as well as IEEESTEC students’ project conferences. The manuscript contains a brief description and results of the implementation and evaluation of the special course “Let’s put knowledge into practical work” for grammar school students. In order to continue their study and provide students with additional knowledge, the Arduino course was designed. Since 2018, by attending the course as an extracurricular activity, students gain new knowledge in the field of electronic components and microcontroller programming. Based on the conducted analyzes and evaluations, as well as current pedagogical trends, the authors give recommendations on how to overcome problems that may arise due to a lack of practical knowledge and increase students’ self-confidence and indicate the importance of a course designed in this way for those freshmen who want to acquire some new skills and knowledge.
{"title":"EXTRACURRICULAR ACTIVITIES IN THE FUNCTION OF IMPROVING PRACTICAL SKILLS OF FUTURE STUDENTS IN THE FIELD OF ЕLECTRICAL ENGINEERING AND COMPUTING","authors":"Emilija Živanović, Miloš Marjanović, Danijel Danković","doi":"10.22190/futlte221227032z","DOIUrl":"https://doi.org/10.22190/futlte221227032z","url":null,"abstract":"This paper is based on the authors’ many years of experience in teaching, organizing special courses and one-day workshops for different groups of students, as well as IEEESTEC students’ project conferences. The manuscript contains a brief description and results of the implementation and evaluation of the special course “Let’s put knowledge into practical work” for grammar school students. In order to continue their study and provide students with additional knowledge, the Arduino course was designed. Since 2018, by attending the course as an extracurricular activity, students gain new knowledge in the field of electronic components and microcontroller programming. Based on the conducted analyzes and evaluations, as well as current pedagogical trends, the authors give recommendations on how to overcome problems that may arise due to a lack of practical knowledge and increase students’ self-confidence and indicate the importance of a course designed in this way for those freshmen who want to acquire some new skills and knowledge.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136318593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.22190/futlte230312028m
Abdulrazak Muhammed, Jamila Yusuf
This study was conducted to assess the employability skills acquisition need for self-reliance in business studies among government junior secondary schools students in Niger State. The researchers raised two research questions for the study. In line with the research question, two null hypotheses were formulated and tested at 0.05 level if significant. A survey research design was used for the study. The area of this study consists of one government junior secondary schools from each local government in the state which comprise of twenty-five local government. A random sampling technique was used and the sample size for the study was two hundred and ten (210). A 4-point Likert scale used for the and the questionnaire was tagged as “Business Studies Skill Acquisition Questionnaire (BSSAQ)” containing twenty (20) statement items were used to collect data. To obtain the reliability coefficient of the measuring instrument, the instrument was pilot tested using some fifteen (15) selected junior secondary schools in Ilorin. The result obtained from the pilot study were then analyzed using Cranach alpha reliability coefficient statistical and the reliability index obtained was 0.88. The data collected on the twenty (20) statement items of the questionnaire were analyzed using mean and standard deviation to answer the research questions and t-test was used to test the null hypotheses formulated for the study. The study revealed among others, that a significant difference existed in the employability skills acquisition need for self-reliance in government junior secondary schools in Niger State. Based on the findings of this study, it was recommended that at junior secondary schools business studies contents should be well taught in other to encourage the acquisition of employability skills among the students of junior secondary schools in Niger state. Also, Business studies at the government junior secondary level should be encouraged through proper funding, and the provision of equipment for better acquisition of computer skills.
{"title":"ASSESSMENT OF EMPLOYABILITY SKILLS ACQUISITION NEED FOR SELF-RELIANCE IN BUSINESS STUDIES AMONG GOVERNMENT JUNIOR SECONDARY SCHOOLS STUDENTS IN NIGER STATE","authors":"Abdulrazak Muhammed, Jamila Yusuf","doi":"10.22190/futlte230312028m","DOIUrl":"https://doi.org/10.22190/futlte230312028m","url":null,"abstract":"This study was conducted to assess the employability skills acquisition need for self-reliance in business studies among government junior secondary schools students in Niger State. The researchers raised two research questions for the study. In line with the research question, two null hypotheses were formulated and tested at 0.05 level if significant. A survey research design was used for the study. The area of this study consists of one government junior secondary schools from each local government in the state which comprise of twenty-five local government. A random sampling technique was used and the sample size for the study was two hundred and ten (210). A 4-point Likert scale used for the and the questionnaire was tagged as “Business Studies Skill Acquisition Questionnaire (BSSAQ)” containing twenty (20) statement items were used to collect data. To obtain the reliability coefficient of the measuring instrument, the instrument was pilot tested using some fifteen (15) selected junior secondary schools in Ilorin. The result obtained from the pilot study were then analyzed using Cranach alpha reliability coefficient statistical and the reliability index obtained was 0.88. The data collected on the twenty (20) statement items of the questionnaire were analyzed using mean and standard deviation to answer the research questions and t-test was used to test the null hypotheses formulated for the study. The study revealed among others, that a significant difference existed in the employability skills acquisition need for self-reliance in government junior secondary schools in Niger State. Based on the findings of this study, it was recommended that at junior secondary schools business studies contents should be well taught in other to encourage the acquisition of employability skills among the students of junior secondary schools in Niger state. Also, Business studies at the government junior secondary level should be encouraged through proper funding, and the provision of equipment for better acquisition of computer skills.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.22190/futlte230622030a
Ivana Arsić, Anja Petrović, Mima Stanković
The COVID-19 pandemic affected practically every country in the world and changed how people lead their daily lives. The purpose of research was to ascertain the relationship between physical activity levels and the incidence of health issues among pupils. This research was conducted using an anonymous online survey that contained selected questions from the World Health Organization's health behaviour in schoolchildren (HBSC questionnaire). The sample of participants consisted of 500 elementary and high school students from the territory of southern Serbia. It was observed that less than 1% of students reported having poor health, while 6% of participants said that they were dissatisfied with their health overall, compared to 94% of students who reported being satisfied with their health. Additionally, a total of 88% of students evaluated their lives with the highest marks, out of which 28% considered their lives to be the greatest they could possibly be. 90% of participants from this sample of students in southern Serbia reported engaging in physical activity three or more times per week, whereas only 3% of students reported engaging in physical activity only once a week or not at all. The key finding of this study proved that students who engaged in greater physical activity had fewer health issues than students who engaged in the least amount of physical activity. There are numerous benefits to being physically active, including how it influences the maintenance of human health and helps children grow and develop properly. Therefore, the importance of this work is reflected in the possibility of gaining knowledge about physical activity during the state of emergency and the connection between physical activity and health problems that emerged among students in southern Serbia during the COVID-19 pandemic.
{"title":"PHYSICAL ACTIVITY AND HEALTH PROBLEMS OF STUDENTS IN SOUTHERN SERBIA DURING THE STATE OF EMERGENCY","authors":"Ivana Arsić, Anja Petrović, Mima Stanković","doi":"10.22190/futlte230622030a","DOIUrl":"https://doi.org/10.22190/futlte230622030a","url":null,"abstract":"The COVID-19 pandemic affected practically every country in the world and changed how people lead their daily lives. The purpose of research was to ascertain the relationship between physical activity levels and the incidence of health issues among pupils. This research was conducted using an anonymous online survey that contained selected questions from the World Health Organization's health behaviour in schoolchildren (HBSC questionnaire). The sample of participants consisted of 500 elementary and high school students from the territory of southern Serbia. It was observed that less than 1% of students reported having poor health, while 6% of participants said that they were dissatisfied with their health overall, compared to 94% of students who reported being satisfied with their health. Additionally, a total of 88% of students evaluated their lives with the highest marks, out of which 28% considered their lives to be the greatest they could possibly be. 90% of participants from this sample of students in southern Serbia reported engaging in physical activity three or more times per week, whereas only 3% of students reported engaging in physical activity only once a week or not at all. The key finding of this study proved that students who engaged in greater physical activity had fewer health issues than students who engaged in the least amount of physical activity. There are numerous benefits to being physically active, including how it influences the maintenance of human health and helps children grow and develop properly. Therefore, the importance of this work is reflected in the possibility of gaining knowledge about physical activity during the state of emergency and the connection between physical activity and health problems that emerged among students in southern Serbia during the COVID-19 pandemic.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136261957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.22190/futlte230404029k
Milena Kaličanin, Aleksandar Novaković
This research investigates the attitudes of future teachers of Serbian as the mother tongue and English as a foreign language (EFL) regarding online teaching during the coronavirus pandemic. Although teaching has continued in virtual classrooms, university teachers have encountered numerous challenges related to teaching the invisible generations: motivation, interaction, and the role of students in online classes, as well as the functionality of methods, techniques, and online tools. The conducted research shows that future teachers of Serbian as the mother tongue and future EFL teachers perceive online teaching as an alternative or a supplement to traditional teaching applied in specific social circumstances. During the period of a year and a half, their attitudes towards online teaching have changed, ranging from acceptance to indecisiveness, and including an inclination to return to traditional classrooms. It should be stated that the bachelor students studying Serbian accepted this way of teaching to a higher degree than the EFL bachelor students. A statistically significant difference is evident in the respondents’ replies with respect to their field of study, but not with respect to the respondents’ gender or the current year of study.
{"title":"SERBIAN AND ENGLISH BACHELOR STUDENTS’ ATTITUDES TOWARDS ONLINE TEACHING: FUTURE TEACHERS’ PERSPECTIVE","authors":"Milena Kaličanin, Aleksandar Novaković","doi":"10.22190/futlte230404029k","DOIUrl":"https://doi.org/10.22190/futlte230404029k","url":null,"abstract":"This research investigates the attitudes of future teachers of Serbian as the mother tongue and English as a foreign language (EFL) regarding online teaching during the coronavirus pandemic. Although teaching has continued in virtual classrooms, university teachers have encountered numerous challenges related to teaching the invisible generations: motivation, interaction, and the role of students in online classes, as well as the functionality of methods, techniques, and online tools. The conducted research shows that future teachers of Serbian as the mother tongue and future EFL teachers perceive online teaching as an alternative or a supplement to traditional teaching applied in specific social circumstances. During the period of a year and a half, their attitudes towards online teaching have changed, ranging from acceptance to indecisiveness, and including an inclination to return to traditional classrooms. It should be stated that the bachelor students studying Serbian accepted this way of teaching to a higher degree than the EFL bachelor students. A statistically significant difference is evident in the respondents’ replies with respect to their field of study, but not with respect to the respondents’ gender or the current year of study.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.22190/futlte230504033d
Marija E. Dinov
The paper explains the role played by the practice of analogical reasoning in piano lessons, especially at the beginner level. The first stage of piano studies is the most important one in raising musicians. In order to develop a young student’s understanding and appreciation of music and piano playing, teachers use interesting and logically connected stories with plenty of entertaining characters, colorful illustrations and imaginative scenes. Comprehensive analogies with images of characters and their adventures used to introduce and expand on musical concepts in working with beginners make complicated playing techniques understandable and acceptable to them. It is very important to invoke students’ imagination and creativity using fantasy, as well as analogies from everyday life, in order to help them to envisage musical images and express them through physical movements. By making progress in piano playing, students also improve their problem-solving skills in the arts, sciences, natural environment and social life.
{"title":"THE FUNCTION OF ANALOGY IN PIANO PEDAGOGY","authors":"Marija E. Dinov","doi":"10.22190/futlte230504033d","DOIUrl":"https://doi.org/10.22190/futlte230504033d","url":null,"abstract":"The paper explains the role played by the practice of analogical reasoning in piano lessons, especially at the beginner level. The first stage of piano studies is the most important one in raising musicians. In order to develop a young student’s understanding and appreciation of music and piano playing, teachers use interesting and logically connected stories with plenty of entertaining characters, colorful illustrations and imaginative scenes. Comprehensive analogies with images of characters and their adventures used to introduce and expand on musical concepts in working with beginners make complicated playing techniques understandable and acceptable to them. It is very important to invoke students’ imagination and creativity using fantasy, as well as analogies from everyday life, in order to help them to envisage musical images and express them through physical movements. By making progress in piano playing, students also improve their problem-solving skills in the arts, sciences, natural environment and social life.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Diabetes mellitus, including type 2 diabetes, is a global health issue with less than 50% of individuals achieving optimal glycemic control. A study at Health Center Krupa na Uni, Republic Srpska, assessed adherence in 159 adults with type 2 diabetes, during the study conducted during 2019-2020. The research used a general and specific questionnaire The Adherence in Chronic Diseases Scale. Findings showed 72.9% had moderate adherence, 16.4% had low adherence, and only 10.7% had high adherence. The female gender predicted higher adherence (p=0.048). The type of oral hypoglycemic agents (p=0.520) was not associated with adherence. Older age (p=0.316) and lower education level (p=0.182) were associated with lower adherence, but not significantly. Age over 60 years and level of education had no significant effects on adherence. Although there was no statistical significance, employed respondents (p=0.076) and those living in rural areas had a higher level of adherence (p=0.064). Some respondents took medications based on their physical needs and beliefs, indicating the need to address beliefs and behaviors influencing adherence. Poor adherence remains a significant issue, and addressing adherence barriers, particularly those related to gender, can improve health outcomes for individuals with type 2 diabetes. Ongoing research and interventions are crucial to improve adherence rates and health outcomes in individuals with type 2 diabetes.
糖尿病，包括2型糖尿病，是一个全球性的健康问题，只有不到50%的人能达到最佳的血糖控制。斯普斯卡共和国Krupa na Uni健康中心的一项研究评估了2019-2020年期间159名2型糖尿病成人患者的依从性。本研究采用了一份普通问卷和一份特殊问卷——慢性疾病依从性量表。结果显示，72.9%的患者有中度依从性，16.4%的患者有低依从性，只有10.7%的患者有高依从性。女性预测更高的依从性(p=0.048)。口服降糖药的类型(p=0.520)与依从性无关。年龄较大(p=0.316)和教育程度较低(p=0.182)与依从性较低相关，但不显著。60岁以上的年龄和受教育程度对依从性没有显著影响。虽然差异无统计学意义，但在职被调查者(p=0.076)和农村被调查者的依从性水平更高(p=0.064)。一些受访者根据他们的身体需求和信仰服用药物，这表明需要解决影响依从性的信念和行为。依从性差仍然是一个重大问题，解决依从性障碍，特别是与性别有关的障碍，可以改善2型糖尿病患者的健康结果。正在进行的研究和干预措施对于提高2型糖尿病患者的依从率和健康结果至关重要。
{"title":"INFLUENCE OF SOCIO-DEMOGRAPHIC FACTORS ON ADHERENCE OF PATIENTS WITH TYPE 2 DIABETES IN A PRIMARY HEALTHCARE SETTING IN WESTERN BOSNIA AND HERCEGOVINA","authors":"Marijana Jandrić-Kočić, Snežana Knežević","doi":"10.22190/fumb230315004j","DOIUrl":"https://doi.org/10.22190/fumb230315004j","url":null,"abstract":"Diabetes mellitus, including type 2 diabetes, is a global health issue with less than 50% of individuals achieving optimal glycemic control. A study at Health Center Krupa na Uni, Republic Srpska, assessed adherence in 159 adults with type 2 diabetes, during the study conducted during 2019-2020. The research used a general and specific questionnaire The Adherence in Chronic Diseases Scale. Findings showed 72.9% had moderate adherence, 16.4% had low adherence, and only 10.7% had high adherence. The female gender predicted higher adherence (p=0.048). The type of oral hypoglycemic agents (p=0.520) was not associated with adherence. Older age (p=0.316) and lower education level (p=0.182) were associated with lower adherence, but not significantly. Age over 60 years and level of education had no significant effects on adherence. Although there was no statistical significance, employed respondents (p=0.076) and those living in rural areas had a higher level of adherence (p=0.064). Some respondents took medications based on their physical needs and beliefs, indicating the need to address beliefs and behaviors influencing adherence. Poor adherence remains a significant issue, and addressing adherence barriers, particularly those related to gender, can improve health outcomes for individuals with type 2 diabetes. Ongoing research and interventions are crucial to improve adherence rates and health outcomes in individuals with type 2 diabetes.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135730232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Julija Radojičić, Tatjana Čutović, Aleksandra Radojičić, Andrija Radojičić
Surgical treatment protocols for rare types of clefts do not exist, especially when they are associated with severe anomalies of the brain and face. Surgical treatment of a newborn with holoprosencephaly, premaxillary agenesis and median cleft lip is a big challenge for the surgeon. The complete lack of bone in the nasal bones and premaxilla make surgical therapy almost impossible. The role of pre-surgical orthodontic therapy plays a major role in creating the conditions for surgical repair of cleft-damaged parts of the face.Case presentation. The paper presents presurgical orthodontic therapy in a newborn with a median cleft lip using the RBJ stimulator. Conclusion. The use of stimulators of a specific construction in the therapy of rare clefts is the method of choice.
{"title":"PRESURGICAL ORTHODONTIC THERAPY IN A NEWBORN WITH MEDIAN CLEFT LIP ACCOMPANIED BY HOLOPROSENCEPHALY AND AGENESIS OF THE PREMAXILLA","authors":"Julija Radojičić, Tatjana Čutović, Aleksandra Radojičić, Andrija Radojičić","doi":"10.22190/fumb230925005r","DOIUrl":"https://doi.org/10.22190/fumb230925005r","url":null,"abstract":"Surgical treatment protocols for rare types of clefts do not exist, especially when they are associated with severe anomalies of the brain and face. Surgical treatment of a newborn with holoprosencephaly, premaxillary agenesis and median cleft lip is a big challenge for the surgeon. The complete lack of bone in the nasal bones and premaxilla make surgical therapy almost impossible. The role of pre-surgical orthodontic therapy plays a major role in creating the conditions for surgical repair of cleft-damaged parts of the face.Case presentation. The paper presents presurgical orthodontic therapy in a newborn with a median cleft lip using the RBJ stimulator. Conclusion. The use of stimulators of a specific construction in the therapy of rare clefts is the method of choice.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135730231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The 5-axis CNC machine tools are used for manufacturing free form surfaces of sophisticated parts such as turbine blades, airfoils, impellers, and aircraft components. The virtual machining systems can be used in order to analyze and modify the 5-axis CNC machine tools operations. Cutting forces and cutting temperatures induce deflection errors in thin-walled structures such as impeller blades through machining operations. Thin-walled impeller blades' flexibility can result in machining errors such as overcutting or undercutting. So, decreasing the deflection error during machining operations of impeller blades can achieve the desired accuracy in produced parts. Optimized machining parameters can be obtained to minimize the deflection of machined impeller blades. In terms of precision and efficiency enhancement in component production processes, a virtual machining system is developed to predict and minimize deflection errors of 5-axis milling operations of impeller blades. The deflection error in machined impeller blades is calculated by using finite element analysis. The optimization methodology based on the genetic algorithm is applied to minimize the deflection error of impeller blades in machining operations. To validate the integrated virtual machining system in the study, the impeller is milled by using a 5-axis CNC machine tool. The CMM machine is used in order to measure and analyze deflection error in the machined impeller blades. As a result, by using the developed virtual machining system in the study, accuracy and efficiency in 5-axis milling operations of impellers can be increased.
{"title":"MINIMIZATION OF DEFLECTION ERROR IN FIVE AXIS MILLING OF IMPELLER BLADES","authors":"Mohsen Soori, Mohammed Asmael","doi":"10.22190/fume210822069s","DOIUrl":"https://doi.org/10.22190/fume210822069s","url":null,"abstract":"The 5-axis CNC machine tools are used for manufacturing free form surfaces of sophisticated parts such as turbine blades, airfoils, impellers, and aircraft components. The virtual machining systems can be used in order to analyze and modify the 5-axis CNC machine tools operations. Cutting forces and cutting temperatures induce deflection errors in thin-walled structures such as impeller blades through machining operations. Thin-walled impeller blades' flexibility can result in machining errors such as overcutting or undercutting. So, decreasing the deflection error during machining operations of impeller blades can achieve the desired accuracy in produced parts. Optimized machining parameters can be obtained to minimize the deflection of machined impeller blades. In terms of precision and efficiency enhancement in component production processes, a virtual machining system is developed to predict and minimize deflection errors of 5-axis milling operations of impeller blades. The deflection error in machined impeller blades is calculated by using finite element analysis. The optimization methodology based on the genetic algorithm is applied to minimize the deflection error of impeller blades in machining operations. To validate the integrated virtual machining system in the study, the impeller is milled by using a 5-axis CNC machine tool. The CMM machine is used in order to measure and analyze deflection error in the machined impeller blades. As a result, by using the developed virtual machining system in the study, accuracy and efficiency in 5-axis milling operations of impellers can be increased.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86518598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mass-customization is related to optimizing the balance between flexibility, strongly required by the customer-focused industries and manufacturing efficiency, which is critical for market competitiveness. In the conventional industries, the process of designing, validating and manufacturing a product is long and expensive. Some of the common approaches for addressing those issues are parametric product modeling and Finite Element Analysis (FEA). However, the costs involved are still relatively high because of the very special expertise needed and the cost of the specialized software. Also, the specific design of the product cannot be validated in a real-time, which often leads to making hard compromises between the specific customer requirements and the structural properties of the product in its exploitation. In this paper, we propose the novel methodology for real-time structural analysis assistance for custom product design. We introduce the concept of so-called compiled FEA model, a Machine Learning (ML) model, consisting of dataset of characteristic product parameters and associated physical quantities and properties, selected ML algorithms and the sets of associated hyperparameters. A case study of creating a compiled FEA model for the case of internal orthopedic fixator is provided.
{"title":"NOVEL METHODOLOGY FOR REAL-TIME STRUCTURAL ANALYSIS ASSISTANCE IN CUSTOM PRODUCT DESIGN","authors":"Milan Zdravković, N. Korunović","doi":"10.22190/fume200828008z","DOIUrl":"https://doi.org/10.22190/fume200828008z","url":null,"abstract":"Mass-customization is related to optimizing the balance between flexibility, strongly required by the customer-focused industries and manufacturing efficiency, which is critical for market competitiveness. In the conventional industries, the process of designing, validating and manufacturing a product is long and expensive. Some of the common approaches for addressing those issues are parametric product modeling and Finite Element Analysis (FEA). However, the costs involved are still relatively high because of the very special expertise needed and the cost of the specialized software. Also, the specific design of the product cannot be validated in a real-time, which often leads to making hard compromises between the specific customer requirements and the structural properties of the product in its exploitation. In this paper, we propose the novel methodology for real-time structural analysis assistance for custom product design. We introduce the concept of so-called compiled FEA model, a Machine Learning (ML) model, consisting of dataset of characteristic product parameters and associated physical quantities and properties, selected ML algorithms and the sets of associated hyperparameters. A case study of creating a compiled FEA model for the case of internal orthopedic fixator is provided.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85352567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present day manufacturing scenario, computer numerical control (CNC) technology has evolved out as a cost effective process to perform repetitive, difficult and unsafe machining tasks while fulfilling the dynamic requirements of high dimensional accuracy and low surface finish. Adoption of CNC technology would help an organization in achieving enhanced productivity, better product quality and higher flexibility. In this paper, an endeavor is put forward to apply discriminant analysis as a multivariate statistical tool to investigate the effects of speed, feed, depth of cut, nose radius and type of the machining environment of a CNC turning center on surface roughness, tool life, cutting force and power consumption. Simultaneous discrimination analysis develops the corresponding discriminant function for each of the responses taking into account all the input parameters together. On the contrary, step-wise discriminant analysis develops the same functions while considering only those significant input parameters influencing the responses. Higher values of hit ratio and cross-validation percentage prove the application of both the discriminant functions as effective prediction tools for achieving enhanced performance of the considered CNC turning operation.
{"title":"PARAMETRIC STUDY OF A CNC TURNING PROCESS USING DISCRIMINANT ANALYSIS","authors":"Baneswar Sarker, S. Chakraborty","doi":"10.22190/fume210403058s","DOIUrl":"https://doi.org/10.22190/fume210403058s","url":null,"abstract":"In the present day manufacturing scenario, computer numerical control (CNC) technology has evolved out as a cost effective process to perform repetitive, difficult and unsafe machining tasks while fulfilling the dynamic requirements of high dimensional accuracy and low surface finish. Adoption of CNC technology would help an organization in achieving enhanced productivity, better product quality and higher flexibility. In this paper, an endeavor is put forward to apply discriminant analysis as a multivariate statistical tool to investigate the effects of speed, feed, depth of cut, nose radius and type of the machining environment of a CNC turning center on surface roughness, tool life, cutting force and power consumption. Simultaneous discrimination analysis develops the corresponding discriminant function for each of the responses taking into account all the input parameters together. On the contrary, step-wise discriminant analysis develops the same functions while considering only those significant input parameters influencing the responses. Higher values of hit ratio and cross-validation percentage prove the application of both the discriminant functions as effective prediction tools for achieving enhanced performance of the considered CNC turning operation.","PeriodicalId":51338,"journal":{"name":"Facta Universitatis-Series Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87222609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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