Radu Petruse | "Lucian Blaga" University of Sibiu (original) (raw)

Papers by Radu Petruse

CRC Press eBooks, Dec 11, 2023

IOP Conference Series: Materials Science and Engineering, 2016

By using the PLM (Product Lifecycle Management) principle on the formwork case study, after deter... more By using the PLM (Product Lifecycle Management) principle on the formwork case study, after determining the functions and the technical solutions, the application must be made as optimum as possible in order to assure productivity and provide the necessary information as quick as possible. The concept is to create a complex management for the formwork based on augmented reality. By taking into account the development rate of the information, augmented reality is tending to be one of the widest (in term of domain) visualization instrument. Also used in the construction domain, augmented reality can be applied also for the case of formwork design and management. The application of the solution will be retrieved in the construction of the product, its transportation and deposit. The usage of this concept will help reduce, even eliminate human or technical errors and can offer a precise state of a specific required formwork from the stock.

IOP Conference Series: Materials Science and Engineering, 2019

The article proposes a generalised CAD modeling for a surgical strategy applied to the axial devi... more The article proposes a generalised CAD modeling for a surgical strategy applied to the axial deviations of the human leg. These deviations appear most of the cases from a most common disease nowadays, ghonartrosys characterised by usage of the knee’s articular cartilage. The surgical strategy is HIGH TIBIAL OSTEOTOMY and it is very appropriate in order to correct the axial deviation due several reasons such as: repair with good results the axial deviations, good rate price/quality, strongly recommended method for young patients, not needed a maintenance activity as in case of the prosthesis. In the article it starts with the presentation of the mechanical axis of the lower limb and of the axial deviations that might appear and then using the CAD type modeling tools it is simulated and modelled the surgical procedure: Closing High tibial osteotomy. The approach is very important both from didactically consideration and possible evaluations presurgical, intrasurgical and postsurgical.

Studies in computational intelligence, 2023

Obtaining parts made of composite materials through 3D Printing Additive manufacturing have fully... more Obtaining parts made of composite materials through 3D Printing Additive manufacturing have fully proved their usefulness due to several advantages such as: the possibility to directly create complex shapes without going through the classic process of transforming the semi-finished products into finished parts through technologies that consume resources and energy and are unfriendly to the environment. The main disadvantage of the parts made by 3D Printing technologies is that they are less resistant from a mechanical point of view. This can be solved by the development of 3D printers capable of printing composite parts consisting of a plastic matrix reinforced with continuous fibers. This research focuses on studying 4 types of 3D-printed Continuous-Fiber-Reinforced Plastics (CFRP) from the point of view of their mechanical properties: Onyx-rigid nylon in which micro carbon fibers are inserted and Onyx reinforced with carbon, glass or Kevlar fiber. Standardized specimens were made for the uniaxial tensile test and the experimental program was designed evaluating: the Elastic modulus [GPa], the Maximum Tensile stress [MPa], the Tensile strain at maximum Tensile stress [mm/mm]. The principal strains were also determined, using the digital image technique made using the Aramis system from GOM. The experimental tests confirm that these new materials will be serious candidates to be used in engineering applications in various fields.

In the work we determine the minimal diameter of the burr for a Black class I preparation to be f... more In the work we determine the minimal diameter of the burr for a Black class I preparation to be filled in with different biomaterials. We used a model of a 46 molar to be cured with photopolymerisable composite materials, metallic or ceramic inlays. The scanned model of a 46 real tooth is processed in CATIA software. It is generated a model of class I preparation and filling shape. In order to obtain a reliable restoration with minimum tooth sacrificed substance the minimum burr diameter to be used for the shape and bottom of the preparation was determined. A 400 N constriction force was considered as a maximum clenching force in mastication. A finite element analyze is made in Ansys software. Shapes of tensions, deformations and safety factor of the modelled tooth are presented, pointing the dangerous areas and sections. The results show an increasing of the safety factor when the section of the shape becomes greater than the proposed value for minimum preparation for a specific bi...

2021 IEEE 21st International Conference on Bioinformatics and Bioengineering (BIBE)

The Visionair Project aims at the creation of a distributed infrastructure of technological facil... more The Visionair Project aims at the creation of a distributed infrastructure of technological facilities in Europe as a visible, attractive entry point towards research and experimentation in high level visualisation, virtual reality and augmented reality fields, for hosting international researchers and giving them the opportunity of trying and practicing their ideas and their research topics. The infrastructure provides access to an extensive pool of visualisation services, including visualisation environments, leading visualisation software packages, postprocessing resources and collaboration environments. ITIA-CNR, as partner of the Visionair Project, is providing access to its infrastructure, namely VirtualFactory, it has already hosted transnational accesses in its facilities and this paper presents them as an example of experiences that can be done by accessing the common infrastructure for research of Visionair. Categories and Subject Descriptions: I.3.7 [Computer Graphics]: T...

2020 IEEE International Conference on Bioinformatics and Biomedicine (BIBM), 2020

Scoliosis is a complex spinal disorder that mostly affects adolescents and younger population. To... more Scoliosis is a complex spinal disorder that mostly affects adolescents and younger population. To avoid and reduce harmful radiation techniques in adolescent idiopathic scoliosis investigation and follow-ups, a novel non-invasive approach is highly recommended and needed in clinical practice. In this paper ARScoliosis application to diagnose, visualize and document spinal condition and particularly adolescent idiopathic scoliosis in real time is presented. This ARScoliosis application is developed in Unity 3D, a game engine, and allows non-invasive quantification of posture and spinal deformity using recently available non-ionizing wide-angle depth sensor Microsoft Azure Kinect DK as a diagnostic medium. Parametric and scalable 3D model of the spine is registered to the internal spinal alignment extracted from the anatomical landmarks and joints in real time and visible over the specific patient. It is envisioned that ARScoliosis will support monitoring of scoliosis after applied th...

This paper presents preliminary results on non-invasive optical diagnosis of patient with adolesc... more This paper presents preliminary results on non-invasive optical diagnosis of patient with adolescent idiopathic scoliosis (AIS) with recently developed tool ScolioSIM. This tool generates intrinsic and extrinsic indicators of the spinal deformity and 3D CAD (Computer-aided Design) deformity model based only on a digitalized dorsal surface of the examined patient. Our primary focus in this paper are absolute axial rotations (AAR) of each vertebra in AIS patients and their correlations. Clinical relevance of this research is high, as we intend to avoid traditional methods which rely on highly complicated reading and measuring of AARs on planar x-ray films, as these methods involve ionizing radiation and require highly experienced observers. Here we demonstrated a good correlation of AARs in 372 patients optically diagnosed, and currently we perform final verification of presented method and generic CAD model of the spine against 200 low-dose EOS scans of AIS patients.

Acta Universitatis Cibiniensis. Technical Series, Dec 1, 2019

The paper is focused on identifying the main requirements for developing a CPPS demonstrator prot... more The paper is focused on identifying the main requirements for developing a CPPS demonstrator prototype. This research aims to categorize the main components and interactions within a new manufacturing system which are required to accommodate a CPPS. The proposed CPPS demonstrator also includes the preliminary requirements identified from the discussions with the regional industry, so that the prototype of the production system could be easily understood and also be the basis for further collaborations. The identified requirements were structured according to the top-down principle focusing on accomplishing the major objectives to be achieved through the prototype of the production system but also on the detailed concepts of the product and the production stations, thus preparing the choice for a concrete technical solution.

Acta Universitatis Cibiniensis. Technical Series, Dec 1, 2019

The paper is an interdisciplinary medical and engineering approach that aims to optimize the accu... more The paper is an interdisciplinary medical and engineering approach that aims to optimize the accuracy of the High Tibial Osteotomy surgical intervention. The axial deviations of the human inferior limb are presented in the first part of the paper. Without altering the shape of the bones, these deviations cause the wear of the knee's articular cartilage by gonarthrosis. One of the most common and effective treatment modalities for eliminating axial deviations is High Tibial Osteotomy. Because the surgical procedure involves 3D spatial bone cutting, the accuracy of the procedure and thus the success of the operation and the recovery of the patient is dependent on the execution of these cuts. Within this paper, a specialized device is proposed that makes it possible to guide the surgical saw and to accurately perform the correction angles. In the last part of the paper, customization possibilities and fabrication of the main elements of the cutting device using Additive Manufacturing processes are presented.

Materials Today: Proceedings, 2019

Abstract Additive Manufacturing technologies have gained a lot of popularity during the past year... more Abstract Additive Manufacturing technologies have gained a lot of popularity during the past years. The current challenge being the transition of this manufacturing technology from prototype oriented towards mass production. In order to achieve this, fabrication times and mechanical parameters must be improved. This paper aims to identify which are the parameters that have the highest influence on parts obtained with fused deposition modeling (FDM) technology from ABS material. In addition, this study identifies which are the most accurate methods to test the mechanical properties of FDM parts while still respecting ASTM standard for testing the tensile properties of plastics. It was found that ASTM D638-02a type I samples are the most suitable to perform tests on high anisotropic plastic materials. The experiment also demonstrates that the build orientation and the wall thickness of FDM fabricated parts has the highest influence on the mechanical properties.

Balkan Region Conference on Engineering and Business Education

Due to our previous experience in AR development, with this research project we propose to study ... more Due to our previous experience in AR development, with this research project we propose to study how Augmented Reality (AR) can be adopted by an industrial partner and which are the major outcomes from which a company may benefit. For this purpose, we partnered with a forward-looking company willing to embrace the idea of implementing new technologies for industrial purposes. In this research we identified that the most significant impact which AR may have for our industrial partner is in providing remote assistance and for product exploitation and marketing purposes. For the latest we developed a customized AR application which is currently available on Apple’s App Store. By analysing the app analytics data, we found out that this application is a success in terms of marketing and not only. For the remote assistance AR app, we chose to use a commercial solution that can be adapted to fit our industrial partner’s needs. We also tested this application and found out that it greatly i...

Balkan Region Conference on Engineering and Business Education

The development of the business - industry environment is unconceivable without the involvement o... more The development of the business - industry environment is unconceivable without the involvement of academia. On one hand, the universities can provide new perspectives and know-how which can be further translated into exquisite products and services for companies. On the other hand, the business environment can raise practical problems and challenges for academia, providing in the same time material support for finding solutions to these problems. This paper presents a successful partnership between business and academia materialized in the development of a robotized semiautomatic motorcycle transmission. Since the solutions existing on the market did not meet the specific requirements of our industrial partner, we were asked to design an innovative and cost effective clutch and gearbox mechanism. The paper presents all the stages passed from establishing specific objectives and tasks for each member of the project’s team, the specific steps followed in order to develop the clutch o...

MATEC Web of Conferences

In this paper we present a design method for a modular device used in different types of HIGH TIB... more In this paper we present a design method for a modular device used in different types of HIGH TIBIAL OSTEOTOMY surgical procedures. The requirements, necessities and functions of this modular device are presented in the first part of the article. An important aspect is the fact that the device must be designed in a manner which permit to use it for all types of HIGH TIBIAL OSTEOTOMY: opening wedge osteotomies, closing wedge osteotomies, medial osteotomies, lateral osteotomies, uniplanar osteotomies or biplanar osteotomies. This fact is possible using modular elements for the main parts of the devices. The researches could be the starting point for others researches regarding the appropriate materials and the possibility to execution customized several parts of the modular device using Additive Manufacturing facilities.

ACTA Universitatis Cibiniensis

This paper presents the development phases of a smart product that can be manufactured on a cyber... more This paper presents the development phases of a smart product that can be manufactured on a cyber physical production system. The intelligent product’s requirements are defined from the manufacturing perspective and then converted into technical product characteristics. Finally, we refined the technical characteristics to create a functional tablet with customizable hardware functionalities as a customizable product.

ACTA Universitatis Cibiniensis

In this paper we proposed to identify the optimum milling parameter required for finishing proces... more In this paper we proposed to identify the optimum milling parameter required for finishing processes performed on 3Dprinted parts from ABS and PLA materials. We have identified the optimum milling parameters for a constant spindle speed of 3500 rot/min for face milling and profile contouring operations with different tools diameters. The study was performed on 3D printed specimens from ABS and PLA materials.

CRC Press eBooks, Dec 11, 2023

IOP Conference Series: Materials Science and Engineering, 2016

By using the PLM (Product Lifecycle Management) principle on the formwork case study, after deter... more By using the PLM (Product Lifecycle Management) principle on the formwork case study, after determining the functions and the technical solutions, the application must be made as optimum as possible in order to assure productivity and provide the necessary information as quick as possible. The concept is to create a complex management for the formwork based on augmented reality. By taking into account the development rate of the information, augmented reality is tending to be one of the widest (in term of domain) visualization instrument. Also used in the construction domain, augmented reality can be applied also for the case of formwork design and management. The application of the solution will be retrieved in the construction of the product, its transportation and deposit. The usage of this concept will help reduce, even eliminate human or technical errors and can offer a precise state of a specific required formwork from the stock.

IOP Conference Series: Materials Science and Engineering, 2019

The article proposes a generalised CAD modeling for a surgical strategy applied to the axial devi... more The article proposes a generalised CAD modeling for a surgical strategy applied to the axial deviations of the human leg. These deviations appear most of the cases from a most common disease nowadays, ghonartrosys characterised by usage of the knee’s articular cartilage. The surgical strategy is HIGH TIBIAL OSTEOTOMY and it is very appropriate in order to correct the axial deviation due several reasons such as: repair with good results the axial deviations, good rate price/quality, strongly recommended method for young patients, not needed a maintenance activity as in case of the prosthesis. In the article it starts with the presentation of the mechanical axis of the lower limb and of the axial deviations that might appear and then using the CAD type modeling tools it is simulated and modelled the surgical procedure: Closing High tibial osteotomy. The approach is very important both from didactically consideration and possible evaluations presurgical, intrasurgical and postsurgical.

Studies in computational intelligence, 2023

Obtaining parts made of composite materials through 3D Printing Additive manufacturing have fully... more Obtaining parts made of composite materials through 3D Printing Additive manufacturing have fully proved their usefulness due to several advantages such as: the possibility to directly create complex shapes without going through the classic process of transforming the semi-finished products into finished parts through technologies that consume resources and energy and are unfriendly to the environment. The main disadvantage of the parts made by 3D Printing technologies is that they are less resistant from a mechanical point of view. This can be solved by the development of 3D printers capable of printing composite parts consisting of a plastic matrix reinforced with continuous fibers. This research focuses on studying 4 types of 3D-printed Continuous-Fiber-Reinforced Plastics (CFRP) from the point of view of their mechanical properties: Onyx-rigid nylon in which micro carbon fibers are inserted and Onyx reinforced with carbon, glass or Kevlar fiber. Standardized specimens were made for the uniaxial tensile test and the experimental program was designed evaluating: the Elastic modulus [GPa], the Maximum Tensile stress [MPa], the Tensile strain at maximum Tensile stress [mm/mm]. The principal strains were also determined, using the digital image technique made using the Aramis system from GOM. The experimental tests confirm that these new materials will be serious candidates to be used in engineering applications in various fields.

In the work we determine the minimal diameter of the burr for a Black class I preparation to be f... more In the work we determine the minimal diameter of the burr for a Black class I preparation to be filled in with different biomaterials. We used a model of a 46 molar to be cured with photopolymerisable composite materials, metallic or ceramic inlays. The scanned model of a 46 real tooth is processed in CATIA software. It is generated a model of class I preparation and filling shape. In order to obtain a reliable restoration with minimum tooth sacrificed substance the minimum burr diameter to be used for the shape and bottom of the preparation was determined. A 400 N constriction force was considered as a maximum clenching force in mastication. A finite element analyze is made in Ansys software. Shapes of tensions, deformations and safety factor of the modelled tooth are presented, pointing the dangerous areas and sections. The results show an increasing of the safety factor when the section of the shape becomes greater than the proposed value for minimum preparation for a specific bi...

2021 IEEE 21st International Conference on Bioinformatics and Bioengineering (BIBE)

The Visionair Project aims at the creation of a distributed infrastructure of technological facil... more The Visionair Project aims at the creation of a distributed infrastructure of technological facilities in Europe as a visible, attractive entry point towards research and experimentation in high level visualisation, virtual reality and augmented reality fields, for hosting international researchers and giving them the opportunity of trying and practicing their ideas and their research topics. The infrastructure provides access to an extensive pool of visualisation services, including visualisation environments, leading visualisation software packages, postprocessing resources and collaboration environments. ITIA-CNR, as partner of the Visionair Project, is providing access to its infrastructure, namely VirtualFactory, it has already hosted transnational accesses in its facilities and this paper presents them as an example of experiences that can be done by accessing the common infrastructure for research of Visionair. Categories and Subject Descriptions: I.3.7 [Computer Graphics]: T...

2020 IEEE International Conference on Bioinformatics and Biomedicine (BIBM), 2020

Scoliosis is a complex spinal disorder that mostly affects adolescents and younger population. To... more Scoliosis is a complex spinal disorder that mostly affects adolescents and younger population. To avoid and reduce harmful radiation techniques in adolescent idiopathic scoliosis investigation and follow-ups, a novel non-invasive approach is highly recommended and needed in clinical practice. In this paper ARScoliosis application to diagnose, visualize and document spinal condition and particularly adolescent idiopathic scoliosis in real time is presented. This ARScoliosis application is developed in Unity 3D, a game engine, and allows non-invasive quantification of posture and spinal deformity using recently available non-ionizing wide-angle depth sensor Microsoft Azure Kinect DK as a diagnostic medium. Parametric and scalable 3D model of the spine is registered to the internal spinal alignment extracted from the anatomical landmarks and joints in real time and visible over the specific patient. It is envisioned that ARScoliosis will support monitoring of scoliosis after applied th...

This paper presents preliminary results on non-invasive optical diagnosis of patient with adolesc... more This paper presents preliminary results on non-invasive optical diagnosis of patient with adolescent idiopathic scoliosis (AIS) with recently developed tool ScolioSIM. This tool generates intrinsic and extrinsic indicators of the spinal deformity and 3D CAD (Computer-aided Design) deformity model based only on a digitalized dorsal surface of the examined patient. Our primary focus in this paper are absolute axial rotations (AAR) of each vertebra in AIS patients and their correlations. Clinical relevance of this research is high, as we intend to avoid traditional methods which rely on highly complicated reading and measuring of AARs on planar x-ray films, as these methods involve ionizing radiation and require highly experienced observers. Here we demonstrated a good correlation of AARs in 372 patients optically diagnosed, and currently we perform final verification of presented method and generic CAD model of the spine against 200 low-dose EOS scans of AIS patients.

Acta Universitatis Cibiniensis. Technical Series, Dec 1, 2019

The paper is focused on identifying the main requirements for developing a CPPS demonstrator prot... more The paper is focused on identifying the main requirements for developing a CPPS demonstrator prototype. This research aims to categorize the main components and interactions within a new manufacturing system which are required to accommodate a CPPS. The proposed CPPS demonstrator also includes the preliminary requirements identified from the discussions with the regional industry, so that the prototype of the production system could be easily understood and also be the basis for further collaborations. The identified requirements were structured according to the top-down principle focusing on accomplishing the major objectives to be achieved through the prototype of the production system but also on the detailed concepts of the product and the production stations, thus preparing the choice for a concrete technical solution.

Acta Universitatis Cibiniensis. Technical Series, Dec 1, 2019

The paper is an interdisciplinary medical and engineering approach that aims to optimize the accu... more The paper is an interdisciplinary medical and engineering approach that aims to optimize the accuracy of the High Tibial Osteotomy surgical intervention. The axial deviations of the human inferior limb are presented in the first part of the paper. Without altering the shape of the bones, these deviations cause the wear of the knee's articular cartilage by gonarthrosis. One of the most common and effective treatment modalities for eliminating axial deviations is High Tibial Osteotomy. Because the surgical procedure involves 3D spatial bone cutting, the accuracy of the procedure and thus the success of the operation and the recovery of the patient is dependent on the execution of these cuts. Within this paper, a specialized device is proposed that makes it possible to guide the surgical saw and to accurately perform the correction angles. In the last part of the paper, customization possibilities and fabrication of the main elements of the cutting device using Additive Manufacturing processes are presented.

Materials Today: Proceedings, 2019

Abstract Additive Manufacturing technologies have gained a lot of popularity during the past year... more Abstract Additive Manufacturing technologies have gained a lot of popularity during the past years. The current challenge being the transition of this manufacturing technology from prototype oriented towards mass production. In order to achieve this, fabrication times and mechanical parameters must be improved. This paper aims to identify which are the parameters that have the highest influence on parts obtained with fused deposition modeling (FDM) technology from ABS material. In addition, this study identifies which are the most accurate methods to test the mechanical properties of FDM parts while still respecting ASTM standard for testing the tensile properties of plastics. It was found that ASTM D638-02a type I samples are the most suitable to perform tests on high anisotropic plastic materials. The experiment also demonstrates that the build orientation and the wall thickness of FDM fabricated parts has the highest influence on the mechanical properties.

Balkan Region Conference on Engineering and Business Education

Due to our previous experience in AR development, with this research project we propose to study ... more Due to our previous experience in AR development, with this research project we propose to study how Augmented Reality (AR) can be adopted by an industrial partner and which are the major outcomes from which a company may benefit. For this purpose, we partnered with a forward-looking company willing to embrace the idea of implementing new technologies for industrial purposes. In this research we identified that the most significant impact which AR may have for our industrial partner is in providing remote assistance and for product exploitation and marketing purposes. For the latest we developed a customized AR application which is currently available on Apple’s App Store. By analysing the app analytics data, we found out that this application is a success in terms of marketing and not only. For the remote assistance AR app, we chose to use a commercial solution that can be adapted to fit our industrial partner’s needs. We also tested this application and found out that it greatly i...

Balkan Region Conference on Engineering and Business Education

The development of the business - industry environment is unconceivable without the involvement o... more The development of the business - industry environment is unconceivable without the involvement of academia. On one hand, the universities can provide new perspectives and know-how which can be further translated into exquisite products and services for companies. On the other hand, the business environment can raise practical problems and challenges for academia, providing in the same time material support for finding solutions to these problems. This paper presents a successful partnership between business and academia materialized in the development of a robotized semiautomatic motorcycle transmission. Since the solutions existing on the market did not meet the specific requirements of our industrial partner, we were asked to design an innovative and cost effective clutch and gearbox mechanism. The paper presents all the stages passed from establishing specific objectives and tasks for each member of the project’s team, the specific steps followed in order to develop the clutch o...

MATEC Web of Conferences

In this paper we present a design method for a modular device used in different types of HIGH TIB... more In this paper we present a design method for a modular device used in different types of HIGH TIBIAL OSTEOTOMY surgical procedures. The requirements, necessities and functions of this modular device are presented in the first part of the article. An important aspect is the fact that the device must be designed in a manner which permit to use it for all types of HIGH TIBIAL OSTEOTOMY: opening wedge osteotomies, closing wedge osteotomies, medial osteotomies, lateral osteotomies, uniplanar osteotomies or biplanar osteotomies. This fact is possible using modular elements for the main parts of the devices. The researches could be the starting point for others researches regarding the appropriate materials and the possibility to execution customized several parts of the modular device using Additive Manufacturing facilities.

ACTA Universitatis Cibiniensis

This paper presents the development phases of a smart product that can be manufactured on a cyber... more This paper presents the development phases of a smart product that can be manufactured on a cyber physical production system. The intelligent product’s requirements are defined from the manufacturing perspective and then converted into technical product characteristics. Finally, we refined the technical characteristics to create a functional tablet with customizable hardware functionalities as a customizable product.

ACTA Universitatis Cibiniensis

In this paper we proposed to identify the optimum milling parameter required for finishing proces... more In this paper we proposed to identify the optimum milling parameter required for finishing processes performed on 3Dprinted parts from ABS and PLA materials. We have identified the optimum milling parameters for a constant spindle speed of 3500 rot/min for face milling and profile contouring operations with different tools diameters. The study was performed on 3D printed specimens from ABS and PLA materials.