WSEAS Transactions on Applied and Theoretical Mechanics最新文献

{"title":"Optimal Design of Electric Motorcycle Tubular Frame using Topology Optimization","authors":"Kamil Stencel, Mariola Jureczko","doi":"10.37394/232011.2023.18.14","DOIUrl":"https://doi.org/10.37394/232011.2023.18.14","url":null,"abstract":"This paper proposes a methodology for designing motorcycle tubular frames using simulation software such as MATLAB/Simulink and ANSYS, which provides an efficient and cost-effective way to approximate loads acting on the structure and topology optimization to meet performance and safety requirements. Using these tools, the design process can be simplified and reduce the number of costly physical prototypes and tests. The multi-body model developed in MATLAB® Simscape was used to approximate the loads and boundary conditions on the frame, while the ANSYS software was used for topology optimization. The resulting motorcycle frame was found to weigh 9.48 kg. The simulation results also showed that the proposed frame design met the required safety and performance criteria. The methodology presented in this paper is not limited to electric motorcycle tubular frames and can be applied to other types of vehicle frames or structures. The use of simulations allows for the exploration of different design options and the identification of optimal solutions with minimal cost and effort. The combination of MATLAB® Simulink and ANSYS is a powerful tool for the design and optimization of complex structures, providing accurate results and saving valuable time and resources.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134913593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Torque Minimization of Dynamically Decoupled 3R Spatial Serial Manipulators via Optimal Motion Generation","authors":"Yaodong Lu, Vigen Arakelian","doi":"10.37394/232011.2023.18.15","DOIUrl":"https://doi.org/10.37394/232011.2023.18.15","url":null,"abstract":"This paper proposes an analytically tractable solution for minimizing input torques in decoupled three-degrees-of-freedom spatial serial manipulators. The solution relies on the generation of motion using a «bang-bang» profile. The problem is solved in two stages. Firstly, the dynamic decoupling of the manipulator is accomplished through the redistribution of the moving masses and the relocation of one of the actuators. This leads to the decoupling of the equations of motion for different degrees of mobility. It is worth mentioning that this solution represents a symbiosis of two distinct approaches: the redistribution of link masses and the relocation of one of the manipulator actuators. This innovative approach to dynamic decoupling has not been previously proposed. At the second stage, the input torques of the actuators are reduced by generating motion profiles for the manipulator's links using the «bang-bang» law. Thus, thanks to the developed methodology, it becomes possible to reduce the energy consumption of high-speed manipulators by choosing the optimal planned motion of their links. To evaluate the effectiveness of this approach, numerical simulations are carried out using the ADAMS software. A comparative analysis of the trajectories generated by the fifth-order polynomial profile, widely used in industrial robots, and the «bang-bang» profile has been performed. The simulation results show act, the use of the «bang-bang» profile allows one to reduce the maximum values of the input torques. The developed technique allows designers to create high-speed manipulators featuring decoupled dynamics and diminished energy consumption.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134913204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy Absorption Analysis of Circular Tube of The Foam for High-Speed Train","authors":"F. Djamaluddin, Daniel Susilo","doi":"10.37394/232011.2023.18.13","DOIUrl":"https://doi.org/10.37394/232011.2023.18.13","url":null,"abstract":"This paper discusses the outcomes concerning the crushing properties of aluminum foam–filled tubes with a circular cross-section. The review assessed the impact of placing aluminum foam in single- and double-walled circular. A parametric evaluation was performed concerning the circular with the single- and double-walled variants. Validation results were contrasted against the documented experimental data, and a noteworthy alignment was observed. The foam strain rate is vital in regulating the crushing properties of the foam-loaded circular, and this factor must be considered. The outcomes also indicate the interaction between the circular wall and foam core has a varying deformation category and specific energy absorption. Foam loading had a similar effect concerning double-walled circular loads with foam. Moreover, evaluations were performed to determine the impact of core thickness and impact velocity on the crashworthiness performance. Further, it was discovered that a rise in core thickness for double-walled foam-loaded circular enhances crushing characteristics until the walls still interact. Subsequently, any rise in core thickness leads to the response aligning more with the single-walled circular energy absorber of a high-speed train.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42908632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the Ground Reaction Force Induced by Swaying or Bobbing People and its Dynamic Effect on Loaded Structures","authors":"V. Šána, T. Plachý, M. Polak, Magdaléna Boháčová","doi":"10.37394/232011.2023.18.12","DOIUrl":"https://doi.org/10.37394/232011.2023.18.12","url":null,"abstract":"The core of the submitted article is in the modeling of bobbing people for describing the action of qualified vandals, who try to achieve an excessive level of vibration by their periodic sway in the knees while they are not losing contact between the footbridge deck and their feet. The DLF models, which already exist, provide particular coefficients only for specific pacing frequencies. On the other hand, our study presents DLF coefficients as a continuous function for frequencies in the range of 1 Hz – 3 Hz. The newly presented DLF model is based on the measurement of 15 random people and compared with the experimental data. Each of these people was measured by a force plate in the frequency range of 1 Hz – 3 Hz. Since we know who exactly was present during the experiment, we also monitored the contact forces produced by these people at frequencies identical to some natural frequencies of the footbridge according to the experimental setup. These measured forces were used directly as the input into the calculation process and compared with the experiment too. Subsequent dynamic calculations of the forced vibration were carried out by Modal Decomposition Method. This method requires a mode shape as one of the inputs, these mode shapes were calculated by the Subspace Iteration Method using commercial software Dlubal RFEM 5.03. Numerical integration of the equations of motion (forced vibration analysis) was done by self-written MATLAB codes and routines. At the end of the article, we summarize the results of theoretical dynamic analysis obtained by theoretical modeling of these vandals. The main outcomes are in the determination of the continuous functions for DLFs and their phase angles based on the experimental results. These values are crucial e.g. for designers, who need to compute the response of a footbridge or a grandstand which could be excited by swaying or bobbing vandals or spectators. Obtained and evaluated continuous functions for DLFs were compared by literature where researchers presented some DLFs for discrete sets of frequencies, which produced a good level of accordance.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47406182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Machine Learning Approach to Estimate Geo-mechanical Parameters from Core Samples: A Comparative Approach","authors":"Jwngsar Brahma","doi":"10.37394/232011.2023.18.11","DOIUrl":"https://doi.org/10.37394/232011.2023.18.11","url":null,"abstract":"Geo-mechanical parameters and Thomsen parameters play very important roles to design a stable wellbore in a challenging environment. The main objective of this paper is to estimate Thomsen's parameters (ε, γ, δ) and geo-mechanical properties from the core samples by Machine Learning and a comparative analysis with the conventional mathematical approach; to place emphasis on the use of Machine Learning and Artificial Intelligence in the Oil & Gas industry and to highlight its future potential to help in the digital transformation of the industry. Two different Machine Learning models, the Ordinary Least Square method and the Random Forest method, were used to predict the aforementioned geo-mechanical properties from the wave velocity and confining pressure data. In this study, it has been observed that the approaches employed in the estimate of geo-mechanical properties are rapid and reliable (about 93.5 percent accuracy) and may be applied in geo-mechanical modeling for wellbore stability analysis for safe and cost-effective well plan and design on a large scale. The analysis in this work indicates that Young’s modulus and Poisson’s ratio are heavily influenced by the anisotropy parameters. Finally, a comparison is made with mathematical approaches. The machine learning and artificial intelligence approaches shown here are excellently matched with mathematical approaches. The geo-mechanical parameters and Thomsen parameters and be computed with reasonable accuracy with the help of our proposed ML algorithms. Our proposed ML model can predict the geo-mechanical parameters and Thomsen parameters from the velocity profile directly without complex mathematical computation. The mathematical model would have required us to first determine the stiffness constants for the prediction of that parameters. Additionally, we may conclude that a machine learning model needs to be trained with more modeling data to predict the right values with a smaller error margin. The number of data points required to train a model has a significant impact on the model's overall accuracy. Therefore, additional modeling data is needed to learn about and comprehend the intricacies, patterns, and interactions between provided input and output variables.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45125268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Special Note on the Error Functions Defined in Certain Domains of the Complex Plane and Some of Their Implications","authors":"Fatma Ahmed Salem Salem, H. Irmak","doi":"10.37394/232011.2023.18.10","DOIUrl":"https://doi.org/10.37394/232011.2023.18.10","url":null,"abstract":"The fundamental object of this specific research is firstly to introduce certain requisite information in relation to the error functions (with complex (or real) parameters), which possess various extensive roles and responsibilities in applications of science, engineering, and technology, next to determine various consequences of those complex functions and also to reveal (or point out) some of those possible consequences. Finally, to present certain recommendations about the possible extent of the scope of this special research note for the relevant researchers.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47679220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementation of an Exponential Mathematical Model of Power-Torque Curves in an Algorithm for Natural Aspirated and Turbocharged Internal Combustion Engines","authors":"Gustavo Ruben Di Rado, D. S. P. García","doi":"10.37394/232011.2023.18.9","DOIUrl":"https://doi.org/10.37394/232011.2023.18.9","url":null,"abstract":"Overtaking is one of the most complex maneuvers performed on two-lane rural highways, and its associated accidents account for a large proportion of the mortality connected to traffic accidents. In addition, the number of long vehicles, such as trucks or buses, using these traffic routes is increasing significantly. On the other hand, to perform this maneuver characterized by a fast and a slow vehicle, the engine of the fast one must have sufficient elasticity to achieve the required acceleration in the high gears, and in this sense, the turbo engine can provide this performance, with small engines and fuel savings. In this work, we develop an algorithm to simulate both naturally aspirated and turbocharged engines, fitting their characteristics based on an exponential model and comparing them with those on test benches.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44856896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On Nonlinear Spatial Vibrations of Rotating Drill Strings under the Effect of a Fluid Flow","authors":"A. Kudaibergenov, A. Kudaibergenov, L. Khajiyeva","doi":"10.37394/232011.2023.18.8","DOIUrl":"https://doi.org/10.37394/232011.2023.18.8","url":null,"abstract":"In this article, the development and subsequent numerical analysis of a nonlinear mathematical model of the drill-string dynamics taking into account the effect of a drilling fluid flow and the gravitational energy of the system is carried out. Spatial lateral vibrations of the drill string modeled as a rotating elastic rod are studied. The developed nonlinear model generalizes and refines the well-known linear models of rod vibrations with the considered effect. The obtained numerical results demonstrate the influence of geometric nonlinearity, the gravitational energy of the drilling system, additional Coriolis and centrifugal forces as well as the parameters of the fluid flow on spatial vibrations of the drill strings. It allows for giving some recommendations on the choice of the drilling system parameters for ensuring safe drilling operations.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41469622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Investigation of the Variability of Bolt Forces in a Preloaded Asymmetric Multi-Bolted Connection under Cyclical Loading","authors":"R. Grzejda","doi":"10.37394/232011.2023.18.7","DOIUrl":"https://doi.org/10.37394/232011.2023.18.7","url":null,"abstract":"A numerical study of a seven-bolt connection with an asymmetric contact surface between the components to be joined is reported. The investigations were organised into two steps. Firstly, the connection was preloaded in a three-pass cycle. Then, the connection was subjected to the cyclically varying force imposed at an angle of 30 degrees to the joined components' contact surfaces to produce both compressive and shear loads in the connection. The connection modelling was performed in the finite element method convention. The joined components were discretized using three-dimensional finite elements and the fasteners were modelled as special elements consisting of flexible beams, stiff heads, and stiff nuts. The article is concluded by analysing selected computational outcomes.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42289507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GE 1.5 XLE Wind Turbine Blade Analysis with Computational Methods for Various Composite Materials","authors":"E. Theotokoglou, G. Xenakis","doi":"10.37394/232011.2023.18.6","DOIUrl":"https://doi.org/10.37394/232011.2023.18.6","url":null,"abstract":"The purpose of this paper is to investigate various composite materials that have been applied in wind turbine blades.Α computational study on a GE 1.5 XLE wind turbine blade with different composite materials was performed. The computational evaluations from the fluent analysis have been used in order to calculate the equivalent (Von-Mises) stress, shear stress, and displacements of a wind turbine blade. The proposed study results in useful and interesting conclusions for the stress and displacement fields that arise in blades with different materials and under different loading conditions.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45969549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}