Pub Date : 2024-09-07DOI: 10.1177/09544062241271690
Ana Marković, Blaža Stojanović, Nikola Komatina, Lozica Ivanović
Automotive industry is characterized by mass production, a large share in the gross national income and high employment of workers with different knowledge and skills. Improving the production process, as well as product quality, is one of the most important tasks of automotive enterprise as well as government management. This research promotes a new fuzzy hybrid model for determining the priority of polymeric materials for manufacturing gears in an exact manner, which leads to an incremental improvement in the quality of the considered product. The analysis of polymeric materials and their characteristic is based on data from the relevant literature and experiences of the best practice. The relative importance of material characteristics is stated as fuzzy group decision making problem. The weights vector is determined by using the fuzzy Analytic Hierarchical Process and fuzzy geometric mean. The rank of polymeric materials is obtained by employing the proposed Technique for Order Preference by Similarity to Ideal Solution with triangular fuzzy numbers. The fuzzy algebra rules have been used for determining: (i) distances from Fuzzy Positive Ideal Solutions and Fuzzy Negative Ideal Solutions and (ii) closeness coefficient values. The proposed fuzzy hybrid model testing and verification are performed on real data in an automotive enterprise.
{"title":"Multi-attribute approach for selection of polymeric materials for manufacturing gears: A case study in the automotive industry","authors":"Ana Marković, Blaža Stojanović, Nikola Komatina, Lozica Ivanović","doi":"10.1177/09544062241271690","DOIUrl":"https://doi.org/10.1177/09544062241271690","url":null,"abstract":"Automotive industry is characterized by mass production, a large share in the gross national income and high employment of workers with different knowledge and skills. Improving the production process, as well as product quality, is one of the most important tasks of automotive enterprise as well as government management. This research promotes a new fuzzy hybrid model for determining the priority of polymeric materials for manufacturing gears in an exact manner, which leads to an incremental improvement in the quality of the considered product. The analysis of polymeric materials and their characteristic is based on data from the relevant literature and experiences of the best practice. The relative importance of material characteristics is stated as fuzzy group decision making problem. The weights vector is determined by using the fuzzy Analytic Hierarchical Process and fuzzy geometric mean. The rank of polymeric materials is obtained by employing the proposed Technique for Order Preference by Similarity to Ideal Solution with triangular fuzzy numbers. The fuzzy algebra rules have been used for determining: (i) distances from Fuzzy Positive Ideal Solutions and Fuzzy Negative Ideal Solutions and (ii) closeness coefficient values. The proposed fuzzy hybrid model testing and verification are performed on real data in an automotive enterprise.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"59 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142201785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-05DOI: 10.1177/09544062241264599
Amir Hasan Manzour, Jamal Zamani
In constrained surface vat photopolymerization, the adhesive force between the formed layer of the model and the bottom of the resin container restricts the printing capability. This research investigates the adhesive forces in digital light processing (DLP) and continuous digital light processing (CDLP), focusing on how the oxygen inhibition effect, resin container membrane, and model geometries affect these forces. This study tested four distinct resin vats, with particular attention given to oxygen-permeable vats, to evaluate their role in reducing adhesive forces. A permeable vat that reduced the separation force by 52% using the oxygen inhibition layer was assessed for continuous printing. The influence of model geometry on the adhesive force in DLP and CDLP was evaluated using a permeable vat. Moreover, an inverse relationship was identified between resin absorbance and both curing depth and printing speed. It was observed that as the model’s cross-sectional area increased, so did the adhesion force in continuous printing. These findings prove that continuous printing can achieve faster build times in CDLP than in DLP, with a maximum speed of 288 mm/h.
{"title":"Examination of adhesive force and the model’s dimension in continuous and conventional printing using the oxygen inhibition effect","authors":"Amir Hasan Manzour, Jamal Zamani","doi":"10.1177/09544062241264599","DOIUrl":"https://doi.org/10.1177/09544062241264599","url":null,"abstract":"In constrained surface vat photopolymerization, the adhesive force between the formed layer of the model and the bottom of the resin container restricts the printing capability. This research investigates the adhesive forces in digital light processing (DLP) and continuous digital light processing (CDLP), focusing on how the oxygen inhibition effect, resin container membrane, and model geometries affect these forces. This study tested four distinct resin vats, with particular attention given to oxygen-permeable vats, to evaluate their role in reducing adhesive forces. A permeable vat that reduced the separation force by 52% using the oxygen inhibition layer was assessed for continuous printing. The influence of model geometry on the adhesive force in DLP and CDLP was evaluated using a permeable vat. Moreover, an inverse relationship was identified between resin absorbance and both curing depth and printing speed. It was observed that as the model’s cross-sectional area increased, so did the adhesion force in continuous printing. These findings prove that continuous printing can achieve faster build times in CDLP than in DLP, with a maximum speed of 288 mm/h.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"74 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-04DOI: 10.1177/09544062241271630
Bohong Zhang, Mingcai Xing, Yi Cui, Qiangqiang Huang, Bin Li, Shuo Liu
A novel static model of planetary roller screw mechanisms (PRSMs) is proposed to obtain the load distribution over threads by an energy method. The energy method consists of the structural potential energy and an optimization problem. The potential energy is calculated by structural discretization. And the optimization problem, whose objective is the structural potential energy, is obtained by combining the principle of minimum potential energy with the forces balance constraints. The load distribution is the result of the optimization problem. A finite element model is established for validation. Compared with previous models, the proposed model has lower complexity and higher precision. To further verify the reliability and practicability of the proposed model, effects of the nut position, shaft diameter, and number of roller threads on the load distribution are analyzed based on the proposed model. The results show that the nut position has little influence on the load distribution. The shaft diameter and number of roller threads significantly impact the load distribution.
{"title":"A novel static model of planetary roller screw mechanisms based on an energy method","authors":"Bohong Zhang, Mingcai Xing, Yi Cui, Qiangqiang Huang, Bin Li, Shuo Liu","doi":"10.1177/09544062241271630","DOIUrl":"https://doi.org/10.1177/09544062241271630","url":null,"abstract":"A novel static model of planetary roller screw mechanisms (PRSMs) is proposed to obtain the load distribution over threads by an energy method. The energy method consists of the structural potential energy and an optimization problem. The potential energy is calculated by structural discretization. And the optimization problem, whose objective is the structural potential energy, is obtained by combining the principle of minimum potential energy with the forces balance constraints. The load distribution is the result of the optimization problem. A finite element model is established for validation. Compared with previous models, the proposed model has lower complexity and higher precision. To further verify the reliability and practicability of the proposed model, effects of the nut position, shaft diameter, and number of roller threads on the load distribution are analyzed based on the proposed model. The results show that the nut position has little influence on the load distribution. The shaft diameter and number of roller threads significantly impact the load distribution.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"74 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-04DOI: 10.1177/09544062241271631
Jianfeng He, Xiaoli Jia, Bo Xu, Shutong Huang, Lu Liu, Jingting Dai, Hengxiang Liu
Addressing the challenges of limited passability and adaptability encountered by existing pipe robots in navigating through tee and four-way junction pipes, This article designs a pipe robot based on the principle of metamorphism. This robot is designed with a variable number of linkages, constituting the core of its system structure. Through this innovative approach, it achieves movement in diverse types of pipelines by altering its own structural configuration. Kinematic analysis is conducted using both the Denavit-Hartenberg (D-H) method and screw theory, providing expressions for the forward kinematics in terms of the robot’s positional and attitudinal states, as well as geometric solutions for the inverse kinematics. Simulations conducted in MATLAB and ADAMS software demonstrate consistent postural changes of the robot, validating its design and capabilities. Prototype experiments in a 500 mm diameter pipeline further confirm the robot’s structural design rationality and its ability to navigate through tee and four-way junction pipes by altering its posture. The results indicate that this pipe robot effectively navigates through straight, vertical tee, and horizontal four-way junction pipes, offering a viable solution for efficiently maneuvering through complex pipeline junctions.
{"title":"Design and analysis of a pipe robot based on metamorphic mechanism","authors":"Jianfeng He, Xiaoli Jia, Bo Xu, Shutong Huang, Lu Liu, Jingting Dai, Hengxiang Liu","doi":"10.1177/09544062241271631","DOIUrl":"https://doi.org/10.1177/09544062241271631","url":null,"abstract":"Addressing the challenges of limited passability and adaptability encountered by existing pipe robots in navigating through tee and four-way junction pipes, This article designs a pipe robot based on the principle of metamorphism. This robot is designed with a variable number of linkages, constituting the core of its system structure. Through this innovative approach, it achieves movement in diverse types of pipelines by altering its own structural configuration. Kinematic analysis is conducted using both the Denavit-Hartenberg (D-H) method and screw theory, providing expressions for the forward kinematics in terms of the robot’s positional and attitudinal states, as well as geometric solutions for the inverse kinematics. Simulations conducted in MATLAB and ADAMS software demonstrate consistent postural changes of the robot, validating its design and capabilities. Prototype experiments in a 500 mm diameter pipeline further confirm the robot’s structural design rationality and its ability to navigate through tee and four-way junction pipes by altering its posture. The results indicate that this pipe robot effectively navigates through straight, vertical tee, and horizontal four-way junction pipes, offering a viable solution for efficiently maneuvering through complex pipeline junctions.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"315 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gear is one of the most crucial components of the transmission system, and the performance of gear directly affects the efficiency and reliability of the transmission system. Conventional methods for designing gear parameters involve several time-consuming and complex steps, which may not guarantee optimal performance. Therefore, we propose a new method for designing gear parameters that aims to improve efficiency and accuracy. First, the tooth surface equations of spur and helical involute gears suitable for symmetric and asymmetric teeth are deduced based on the gear-forming machining principle. Second, the performance evaluation models for load capacity, dynamic performance, efficiency, and power density of the gears are established based on the precise gear surface. The design objectives are standardized and evaluated comprehensively using a linear weighting method. Finally, a forward performance-driven design method of gear parameters is established. The proposed method is applied to a helical gear pair design case, and the results show that 90.7% of the individuals in the Pareto optimal front are asymmetric gears, with 9.3% being symmetric gears. This suggests that asymmetric gears have more opportunities to be optimal than symmetric gears. The highest-ranked gear designed using the proposed method is superior to the gear designed using conventional methods.
{"title":"A novel forward performance-driven design method for gear parameters","authors":"Jiayu Zheng, Changzhao Liu, Shuxin Chen, Xianglong Chen, Nanze Wu","doi":"10.1177/09544062241271620","DOIUrl":"https://doi.org/10.1177/09544062241271620","url":null,"abstract":"Gear is one of the most crucial components of the transmission system, and the performance of gear directly affects the efficiency and reliability of the transmission system. Conventional methods for designing gear parameters involve several time-consuming and complex steps, which may not guarantee optimal performance. Therefore, we propose a new method for designing gear parameters that aims to improve efficiency and accuracy. First, the tooth surface equations of spur and helical involute gears suitable for symmetric and asymmetric teeth are deduced based on the gear-forming machining principle. Second, the performance evaluation models for load capacity, dynamic performance, efficiency, and power density of the gears are established based on the precise gear surface. The design objectives are standardized and evaluated comprehensively using a linear weighting method. Finally, a forward performance-driven design method of gear parameters is established. The proposed method is applied to a helical gear pair design case, and the results show that 90.7% of the individuals in the Pareto optimal front are asymmetric gears, with 9.3% being symmetric gears. This suggests that asymmetric gears have more opportunities to be optimal than symmetric gears. The highest-ranked gear designed using the proposed method is superior to the gear designed using conventional methods.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"8 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142201801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-03DOI: 10.1177/09544062241271718
Yinhu Xi, Haohao Zhang, Bo Li
3D modeling of wear particles has proven to be a useful tool for monitoring mechanical failure conditions. In this work, a new method for 3D reconstruction of wear particles in uncontaminated oil (healthy oil) and contaminated oil (used oil) was proposed. The image acquisition device can capture multi-view images of moving wear particles in both healthy and used oil by using the reflected light. The images were pretreated first, and the image color inversion was conducted using the Pillow library. The pretreated wear particle images were used for 3D reconstruction using long short-term memory 3D recurrent reconstruction neural network. The current results were verified against existing results, and good agreement can be found. It can be concluded that we can reconstruct the similar 3D wear particle results with fewer images by comparison with other methods. Specifically, only 4–6 image samples were used for the 3D reconstruction of wear particles, and at least 8 image samples were needed for other existing reports.
{"title":"Wear particles image enhancement using long short-term memory 3D recurrent reconstruction neural network (LSTM 3D-R2N2)","authors":"Yinhu Xi, Haohao Zhang, Bo Li","doi":"10.1177/09544062241271718","DOIUrl":"https://doi.org/10.1177/09544062241271718","url":null,"abstract":"3D modeling of wear particles has proven to be a useful tool for monitoring mechanical failure conditions. In this work, a new method for 3D reconstruction of wear particles in uncontaminated oil (healthy oil) and contaminated oil (used oil) was proposed. The image acquisition device can capture multi-view images of moving wear particles in both healthy and used oil by using the reflected light. The images were pretreated first, and the image color inversion was conducted using the Pillow library. The pretreated wear particle images were used for 3D reconstruction using long short-term memory 3D recurrent reconstruction neural network. The current results were verified against existing results, and good agreement can be found. It can be concluded that we can reconstruct the similar 3D wear particle results with fewer images by comparison with other methods. Specifically, only 4–6 image samples were used for the 3D reconstruction of wear particles, and at least 8 image samples were needed for other existing reports.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"7 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-02DOI: 10.1177/09544062241270500
Pouria Eskandarzadeh, Moosa Ayati, Parham Rezaei
This paper presents a novel approach utilizing a sliding mode controller to control a quadrotor effectively in the presence of structural faults. While previous research has extensively explored fault-tolerant control for UAVs, particularly addressing faulty actuators and sensors, there remains a significant gap in addressing control methods for quadrotors experiencing structural faults. We focus specifically on scenarios where a fault in one of the quadrotor’s rotors diverts thrust from the vertical axis, complicating traditional control methods. Our proposed method involves two key steps: firstly, identifying the fault vector using a terminal sliding mode observer, and secondly, calculating appropriate control inputs using a sliding mode method based on the estimated fault vector. Simulation results demonstrate the robustness of this approach, showing accurate control performance even in the presence of multiple faults and disturbances. The system’s reliability hinges on the convergence of the disturbance observer’s estimation error to zero within a finite time frame. In conclusion, the developed controller offers a dependable solution for safely controlling a faulty quadrotor amidst high nonlinearity and uncertainty.
{"title":"Disturbance-observer-based terminal sliding mode control of the quadrotor with thrust deviation fault","authors":"Pouria Eskandarzadeh, Moosa Ayati, Parham Rezaei","doi":"10.1177/09544062241270500","DOIUrl":"https://doi.org/10.1177/09544062241270500","url":null,"abstract":"This paper presents a novel approach utilizing a sliding mode controller to control a quadrotor effectively in the presence of structural faults. While previous research has extensively explored fault-tolerant control for UAVs, particularly addressing faulty actuators and sensors, there remains a significant gap in addressing control methods for quadrotors experiencing structural faults. We focus specifically on scenarios where a fault in one of the quadrotor’s rotors diverts thrust from the vertical axis, complicating traditional control methods. Our proposed method involves two key steps: firstly, identifying the fault vector using a terminal sliding mode observer, and secondly, calculating appropriate control inputs using a sliding mode method based on the estimated fault vector. Simulation results demonstrate the robustness of this approach, showing accurate control performance even in the presence of multiple faults and disturbances. The system’s reliability hinges on the convergence of the disturbance observer’s estimation error to zero within a finite time frame. In conclusion, the developed controller offers a dependable solution for safely controlling a faulty quadrotor amidst high nonlinearity and uncertainty.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"2 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142201786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-09-02DOI: 10.1177/09544062241270629
Ao Liu, Bingbing Nie, Yu Liu, Guibing Li
Ground contact is the main source for head injuries of two-wheeler (TW) cyclists in vehicle collision accidents, and there is still a lack of understanding of TW cyclist ground impact kinematics. The purpose of the current study is therefore to investigate the kinematics of TW cyclists toward head-ground contact after vehicle collisions via multi-body modeling of vehicle-to-TW crashes under different scenarios. The results indicate that: a lower relative height of pelvis to vehicle bonnet leading edge and vehicle impact speed are more likely to induce a forward landing kinematics to TW cyclists, while higher values of these parameters are generally associated with the backward rolling or soaring movement; TW cyclists are more likely to drop to the side of the vehicle when the TW is moving or with a large offset distance from the center line of the struck vehicle; the head-first ground contact configuration is generally associated with shorter bicyclists in sedan impacts, bicyclists in MPV crashes and all TW cyclists in the crashes with a high vehicle impact speed (>30 km/h); the head-ground contact velocity of TW cyclists is significantly higher in the rear-end dropping cases, and shows relatively high correlation to vehicle impact speed but low correlation to TW moving speed; the head-ground contact velocity of TW cyclists is strongly affected by the body motion before head-ground impact, and head-first contacts could have an either low or high ground contact velocity. The findings may provide preliminary reference for future strategies of TW cyclist ground injury prevention.
{"title":"Kinematics of two-wheeler cyclists toward head-ground contact after vehicle collisions","authors":"Ao Liu, Bingbing Nie, Yu Liu, Guibing Li","doi":"10.1177/09544062241270629","DOIUrl":"https://doi.org/10.1177/09544062241270629","url":null,"abstract":"Ground contact is the main source for head injuries of two-wheeler (TW) cyclists in vehicle collision accidents, and there is still a lack of understanding of TW cyclist ground impact kinematics. The purpose of the current study is therefore to investigate the kinematics of TW cyclists toward head-ground contact after vehicle collisions via multi-body modeling of vehicle-to-TW crashes under different scenarios. The results indicate that: a lower relative height of pelvis to vehicle bonnet leading edge and vehicle impact speed are more likely to induce a forward landing kinematics to TW cyclists, while higher values of these parameters are generally associated with the backward rolling or soaring movement; TW cyclists are more likely to drop to the side of the vehicle when the TW is moving or with a large offset distance from the center line of the struck vehicle; the head-first ground contact configuration is generally associated with shorter bicyclists in sedan impacts, bicyclists in MPV crashes and all TW cyclists in the crashes with a high vehicle impact speed (>30 km/h); the head-ground contact velocity of TW cyclists is significantly higher in the rear-end dropping cases, and shows relatively high correlation to vehicle impact speed but low correlation to TW moving speed; the head-ground contact velocity of TW cyclists is strongly affected by the body motion before head-ground impact, and head-first contacts could have an either low or high ground contact velocity. The findings may provide preliminary reference for future strategies of TW cyclist ground injury prevention.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"10 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-29DOI: 10.1177/09544062241272701
Despoina Mougakou, Christina Georgantopoulou, Dimitrios Mathioulakis
Based on wind tunnel tests, the aerodynamic behaviour of a full-scale sail (2.7 m × 2 m) of the OPTIMIST boat is presented for various sail trims. The sail with its vertical mast was attached to a six component balance in a 3.5 m × 4.5 m cross-section of a closed circuit wind tunnel at the National Technical University of Athens. The aerodynamic force and moment vectors applied on the sail were measured for various angles of attack in the interval 10°–40°, for a free stream of 5 m/s and for four shapes of the sail, varying the tension applied on it. Its three dimensional shape was reconstructed using a commercial motion capture system, including three infra-red cameras and a number of spherical reflectors attached to the sail surface. Lift, drag, moment coefficients and the centre of pressure are presented as a function of the angle of attack and the sail trim, as well as the characteristic geometric features of the sail at various horizontal sections like the maximum camber and its location, its inlet-outlet and twist angles.
{"title":"Aerodynamic performance of an OPTIMIST full-scale sail for various sail trims: An experimental study","authors":"Despoina Mougakou, Christina Georgantopoulou, Dimitrios Mathioulakis","doi":"10.1177/09544062241272701","DOIUrl":"https://doi.org/10.1177/09544062241272701","url":null,"abstract":"Based on wind tunnel tests, the aerodynamic behaviour of a full-scale sail (2.7 m × 2 m) of the OPTIMIST boat is presented for various sail trims. The sail with its vertical mast was attached to a six component balance in a 3.5 m × 4.5 m cross-section of a closed circuit wind tunnel at the National Technical University of Athens. The aerodynamic force and moment vectors applied on the sail were measured for various angles of attack in the interval 10°–40°, for a free stream of 5 m/s and for four shapes of the sail, varying the tension applied on it. Its three dimensional shape was reconstructed using a commercial motion capture system, including three infra-red cameras and a number of spherical reflectors attached to the sail surface. Lift, drag, moment coefficients and the centre of pressure are presented as a function of the angle of attack and the sail trim, as well as the characteristic geometric features of the sail at various horizontal sections like the maximum camber and its location, its inlet-outlet and twist angles.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"1 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-28DOI: 10.1177/09544062241270502
Guanglei Wu
This paper deals with the suppression of robotic joint buffetings for enhanced precision of trajectory tracking by means of fuzzy-based super-twist sliding mode control, which is illustrated with a fast pick-and-place parallel robot for material handling. Prior to control design, the joint motions and torques are measure to identify the dynamic parameters of the robot with recursive least square method, which is experimentally validated for the further model-based control design. In order to suppress the joint buffetings and to improve the tracking accuracy, the control law by integrating fuzzy algorithm and second-order sliding mode control is designed, where the control performance is evaluated by observing the joint dynamics, compared to the classical computed torque control and fuzzy sliding mode variable structure control. The experimental results and comparative study show the effectiveness of the developed control scheme, regarding the joint buffetings suppression and trajectory tracking precision. The main contribution lies in the integrated fuzzy algorithm and second-order sliding mode control for the model-based control design, with acceptable computational cost and trajectory tracking accuracy, from the perspective of actual engineering application.
{"title":"Joint buffetings suppression and trajectory tracking by fuzzy-based super-twist sliding mode control: Application to a fast parallel robot for PnP operations","authors":"Guanglei Wu","doi":"10.1177/09544062241270502","DOIUrl":"https://doi.org/10.1177/09544062241270502","url":null,"abstract":"This paper deals with the suppression of robotic joint buffetings for enhanced precision of trajectory tracking by means of fuzzy-based super-twist sliding mode control, which is illustrated with a fast pick-and-place parallel robot for material handling. Prior to control design, the joint motions and torques are measure to identify the dynamic parameters of the robot with recursive least square method, which is experimentally validated for the further model-based control design. In order to suppress the joint buffetings and to improve the tracking accuracy, the control law by integrating fuzzy algorithm and second-order sliding mode control is designed, where the control performance is evaluated by observing the joint dynamics, compared to the classical computed torque control and fuzzy sliding mode variable structure control. The experimental results and comparative study show the effectiveness of the developed control scheme, regarding the joint buffetings suppression and trajectory tracking precision. The main contribution lies in the integrated fuzzy algorithm and second-order sliding mode control for the model-based control design, with acceptable computational cost and trajectory tracking accuracy, from the perspective of actual engineering application.","PeriodicalId":20558,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science","volume":"21 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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