Articles de revues : « Tooth root optimization »

1

Uelpenich, Ray, et Peter Tenberge. « Fast tooth root load capacity optimization based on improved design of hob geometry ». MATEC Web of Conferences 287 (2019) : 01011. http://dx.doi.org/10.1051/matecconf/201928701011.

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The competitiveness of gearboxes is significantly influenced by their performance ability. Increasing the tooth root load capacity has always been in focus of current research because in case of a failure of the gearwheel due to a tooth root fracture, the complete gearbox fails. This paper presents a new calculation method that enables the optimization of hob geometries within a few minutes so that they lead to reduced stresses in the tooth root fillet of spur gears. This results in reductions of the maximum tooth root stress of 10% and more for most gearwheels. The manufacturing costs for the optimized hob are only influenced slightly. In order to increase the computational speed compared to purely FE-based optimization methods, the present paper shows a method in which the decisive part of the optimization process is based on an analytical equation which are derived by a small number of FE-calculations.

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Vaghela, Priyakant, et Jagdish Prajapati. « Optimization of Tooth Root Profile Using Bezier Curve with G2 Continuity to Reduce Bending Stress of Asymmetric Spur Gear Tooth ». MATEC Web of Conferences 237 (2018) : 03010. http://dx.doi.org/10.1051/matecconf/201823703010.

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This research describes simple and innovative approach to reduce bending stress at tooth root of asymmetric spur gear tooth which is desire for improve high load carrying capacity. In gear design at root of tooth circular-filleted is widely used. Blending of the involute profile of tooth and circular fillet creates discontinuity at root of tooth causes stress concentration occurs. In order to minimize stress concentration, geometric continuity of order 2 at the blending of gear tooth plays very important role. Bezier curve is used with geometric continuity of order 2 at tooth root of asymmetric spur gear to reduce bending stress.

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Kapelevich, A. L., et Y. V. Shekhtman. « Optimization of asymmetric tooth root generated with protuberance hob ». Forschung im Ingenieurwesen 83, n^o 3 (24 juillet 2019) : 627–34. http://dx.doi.org/10.1007/s10010-019-00357-2.

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Yang, Yu, Xing Guo, Shu Dong Yang et Tao Xu. « Strength Optimization Design of a Helical Hydraulic Rotary Actuator ». Advanced Materials Research 544 (juin 2012) : 139–44. http://dx.doi.org/10.4028/www.scientific.net/amr.544.139.

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A helical hydraulic rotary actuator for part-turn motion control is presented. Because of its compact structure and large output torque, strength study for the helical hydraulic rotary actuator becomes very necessary. Using AWE, influences of multi-start thread engagement length, thread start number, spline pressure angle and piston material on strength of the actuator’s key parts are studied in depth, so as to optimize the actuator’s strength and structure. The results show that the influences of nut width, thread start number and piston material on multi-start thread root strength of nut are notable, the influence of pressure angle on spline tooth root strength of output shaft is visible, and stress concentration on multi-start thread root and spline tooth root is very obvious.

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Seitz, K. F., J. Grabe et T. Köhne. « A three-dimensional topology optimization model for tooth-root morphology ». Computer Methods in Biomechanics and Biomedical Engineering 21, n^o 2 (25 janvier 2018) : 177–85. http://dx.doi.org/10.1080/10255842.2018.1431778.

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Landi, Luca, Alessandro Stecconi, Giulia Morettini et Filippo Cianetti. « Analytical procedure for the optimization of plastic gear tooth root ». Mechanism and Machine Theory 166 (décembre 2021) : 104496. http://dx.doi.org/10.1016/j.mechmachtheory.2021.104496.

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Zhang, Yu Bai, Hui Qun Yuan et Ming Xuan Liang. « Simulation Research on Tooth Root Dynamic Stress of Marine Helical Gear Meshing Impact ». Applied Mechanics and Materials 331 (juillet 2013) : 7–10. http://dx.doi.org/10.4028/www.scientific.net/amm.331.7.

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Finite element model of helical gear meshing of large burden marine is built based on explicit dynamics finite element method, dynamics stress variation of helical gear tooth is simulated under multiple working conditions, research is focused on the impact of changes in working conditions on the dynamic stress of the tooth root. The results show that helical gear pair speed and center distance error have great impact on dynamic stress of tooth root. The results provide reference for dynamic performance optimization of marine gears.

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Week, M., et O. Brömsen. « A computer system for tooth root optimization of case-hardened gearwheels ». CIRP Annals 51, n^o 1 (2002) : 135–38. http://dx.doi.org/10.1016/s0007-8506(07)61484-x.

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Sholahuddin, Umar, Agus Purwadi et Yanuarsyah Haroen. « Structural Optimizations of a 12/8 Switched Reluctance Motor using a Genetic Algorithm ». International Journal of Sustainable Transportation Technology 1, n^o 1 (30 avril 2018) : 30–34. http://dx.doi.org/10.31427/ijstt.2018.1.1.5.

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Structural design optimization of 12/8 switched reluctance motor using single objectives genetic algorithms is explored. The objective of this optimization is to maximize the output torque using four parameters, namely rotor width of tooth root, rotor width of tooth tip, half of stator tooth width, and stator outer diameter. The result is the optimized motor has higher average torque of 25% compared to the initial design. The evaluation of motor model is finite element method. The 12/8 switched reluctance motor will be applied in a mini electric vehicle.

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Wang, Chun Xiang, Fan Juan Meng et Jing Qiang Zhang. « Research on the 3D Modeling Method of Epicycloids’ Bevel Gear Based on Pro/E ». Applied Mechanics and Materials 120 (octobre 2011) : 15–19. http://dx.doi.org/10.4028/www.scientific.net/amm.120.15.

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In order to obtain 3D solid model of an Oerlikon system’s prolate epicycloidal bevel gear by full generating processing, the solid modeling method for the gear was studied in Pro/E. First, Drawing benchmark circles (base on the circle and reference circle as well as tip circle and root circle)and involute tooth profile of virtual equivalent gears of both large end and small end of the real gear, and then an intercepted segment of prolate epicycloid which has the same trend to the tooth and is controlled by prolate epicycloidal equations is projected to the surface of the gear’s root cone for the sake of getting tooth curve along axial direction. In the end, along the tooth curve and on the root cone conducting a variable cross section solid scanning to tooth shaped cross section, a complete gear tooth will be gained and at last model establishing will be finished. This method provided digital basis for optimization design, reverse design and rapid prototyping of this kind of gear, and so its design efficiency is improved.

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Sun, Hua. « Optimization Design of the Composite Hub Connection Structure Based on ANSYS Software Technology ». Advanced Materials Research 139-141 (octobre 2010) : 1068–72. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1068.

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This article through analysing coupler's structure, involute spline's stress situation, the tooth face contact intensity, the tooth root bending strength, the tooth root shearing strength, tooth face wear ability and the external spline reverse and curving bearing capacity carry on the precise computation and the examination, simultaneously a multianalysis bulge tight joint set of structure and the correlation computation examination, has established the shaft bossing compound coupler main spare part structure type. In this article based on the shaft bossing composite construction optimization design is targeted mainly flexibility swelling ring shape to optimize the design, change that flexibility swelling ring cone-cone angle, which makes flexible swelling ring Auxiliary T-twisting greater. In the analysis, it is necessary to use the software ANSYS, through the creation of the shaft bossing composite construction of the parametrization model, a flexible swelling ring cone-cone angle of the design variables and flexibility swelling ring allowable material stress as binding conditions, bulging with flexible support ring-twisting as the objective function of T,right propeller shaft coupler hub composite structure axisymmetric analysis, contact analysis and design optimization, inflation reached a flexible support ring largest T-twisting, work stress does not exceed the allowable material stress, elastic swelling ring-cone angle of the optimal solution.

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Bian, Xiang, Zong De Fang, Kun Qin, Lifei Lian et Bao Yu Zhang. « Multi-Objective Topology Optimization for Bevel Gear and Geometrical Reconstruction ». Applied Mechanics and Materials 278-280 (janvier 2013) : 139–42. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.139.

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Usually the gear modification is a main measure to reduce the vibration and noise of the gears, but in view of the complexity of the gear modification, topology optimization method was used to optimize the structure of the gear. The minimum volume was set as the direct optimization goal. To achieve the target of reducing contact stress, tooth root bending stress and improving flexibility, the upper bound of the stress and lower bound of the flexibility were set appropriately, thus realizing multi-objective optimization indirectly. A method for converting topology result into parametric CAD model which can be modified was presented, by fitting the topology result with simple straight lines and arcs, the model can be smoothed automatically, after further regulating, the geometry reconstruction was finished. After topology optimization, the resulting structure and properties of the gear are consistent with cavity gear. While reducing the weight of the gear, the noise can be reduced and its life would be extended through increasing flexibility and reducing tooth root stress.

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A. Phalake, Atul, et Abhay A. Utpat. « Optimization of Tooth Fillet Profile of Spur Gear with Asymmetric Tooth to Analyse the Bending Stress Concentration at Root of Tooth ». International Journal of Engineering Trends and Technology 36, n^o 3 (25 juin 2016) : 151–54. http://dx.doi.org/10.14445/22315381/ijett-v36p228.

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Atanasovska, Ivana, Radivoje Mitrovic et Dejan Momcilovic. « Explicit Parametric Method for Optimal Spur Gear Tooth Profile Definition ». Advanced Materials Research 633 (janvier 2013) : 87–102. http://dx.doi.org/10.4028/www.scientific.net/amr.633.87.

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The gear tooth profile has an immense effect on the main operating parameters of gear pairs (load capacity, working life, efficiency, vibrations, etc). In current engineering research and practice, there is a strong need to develop methods for tooth profile optimization. In this paper a new method for selecting the optimal tooth profile parameters of spur gears is described. This method has been named the Explicit Parametric Method (EPM). The addendum modification coefficient, radius of root curvature, and pressure angle of the basic rack for cylindrical gears, have been identified as the main tooth profile parameters of spur gears. Therefore, the EPM selects the optimal values for these three tooth profile parameters. Special attention has been paid to develop a method of adjustment for the particular working conditions and explicit optimization requirements. The EPM for optimal tooth profile parameters of gears uses contact nonlinear Finite Element Analysis (FEA) for calculation of deformations and stresses of gear pairs, in addition to explicit comparative diagrams for optimal tooth profile parameter selection.

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Zhang, Hong Du, et Tao Sun. « Dynamics Analysis and Optimization of Gear Transmission System ». Applied Mechanics and Materials 456 (octobre 2013) : 76–79. http://dx.doi.org/10.4028/www.scientific.net/amm.456.76.

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The gear transmission system was parametric modeled in the software Pro/E to establish the prototype, and imported into ADAMS. The meshing force curves of time domain and frequency domain were reached through dynamic simulation. Then the gear system was optimized with several constraint conditions, such as the number of surface modes, helix angle, cutting conditions, minimum tooth width, the contact fatigue strength, and tooth root bending fatigue strength. The optimization was calculated with these constraint conditions, and got the best design of gear system. After optimization, the gear transmission system was simulated again to reach the dynamic analysis and made a contract with the former simulation results. The simulation of the optimized gear system shows that the optimized gear has good mechanical properties.

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Partyka, Marian A., et Maria Natorska. « Discrete Optimization of a Gear Pump after Tooth Root Undercutting by Means of Multi-Dimensional Logic Functions ». Applied Sciences 10, n^o 13 (7 juillet 2020) : 4682. http://dx.doi.org/10.3390/app10134682.

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In this paper, the optimization of a gear pump after tooth root undercutting has been investigated; this requires the volumetric, mechanical and total efficiencies of the pump to be calculated. Due to conflict in the existing model, the total efficiency is often calculated with the assumption that the other efficiencies have acceptable values. Multiple-dimensional logical functions are an additional independent method that can be used for the optimization of a pump.

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Ma, Yong, Xin Hua Dong et Qi Huang. « Tooth Root Stress Analysis of Gear Processed by Full Radius Hob Based on ANSYS/LS-DYNA ». Advanced Materials Research 479-481 (février 2012) : 1409–13. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1409.

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According to principle of hobbing, this paper set up accurate model of gear processed by full radius hob based on ANSYS/LS-DYNA software. A dynamic contact analysis of gears are completed and we gets stress distribution of tooth root as time changes, making foundation for future study and optimization design of full radius hob.

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Spitas, Vasilios A., Theodore N. Costopoulos et Christos A. Spitas. « Optimum Gear Tooth Geometry for Minimum Fillet Stress Using BEM and Experimental Verification With Photoelasticity ». Journal of Mechanical Design 128, n^o 5 (27 novembre 2005) : 1159–64. http://dx.doi.org/10.1115/1.2216731.

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This paper introduces the concept of nondimensional gear teeth to be used in gear stress minimization problems. The proposed method of modeling reduces the computational time significantly when compared to other existing methods by essentially reducing the total number of design variables. Instead of modeling the loaded gear tooth and running BEA to calculate the maximum root stress at every iterative step of the optimization procedure, the stress is calculated by interpolation of tabulated values, which were calculated previously by applying the BEM on nondimensional models corresponding to different combinations of the design parameters. The complex algorithm is used for the optimization and the root stresses of the optimum gears are compared with the stresses of the standard gears for the same transmitted torque. Reduction in stress up to 36.5% can be achieved in this way. This reduction in stress has been confirmed experimentally with two-dimensional photoelasticity.

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Xie, Fei, Jian Hua Wang et Yun Cheng Wang. « Finite Element Analysis of Flexural Strength for Helical Gear of Automotive Transmission ». Advanced Materials Research 503-504 (avril 2012) : 723–26. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.723.

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On the basis of the analysis of special demand of helical gear of automotive transmission, gear precision modeling and finite element analysis of flexural strength were carried out in this paper. In UG three-dimensional modeling environment, helical gear model was generated and imported into ANSYS software through data exchange interface. Then meshed on the geometric model, discussed the tooth contact area and the detrimental loading position, and compared the influence on gear strength with different tooth root fillet radius. The paper provided certain methods to guide the gear parametric design, strength analysis and improving optimization design efficiency of transmission gear parts.

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Tavakoli, M. S., et D. R. Houser. « Optimum Profile Modifications for the Minimization of Static Transmission Errors of Spur Gears ». Journal of Mechanisms, Transmissions, and Automation in Design 108, n^o 1 (1 mars 1986) : 86–94. http://dx.doi.org/10.1115/1.3260791.

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A procedure for computing static transmission errors and tooth load sharing was developed for low and high contact ratio internal and external spur gears. A suitable optimization algorithm was used to minimize any combination of the harmonics of gear mesh frequency components of the static transmission error. Different combinations of tip and root relief may be used to achieve optimization. These include varying the starting point of relief and varying the magnitude of relief, and selecting the gear and/or the pinion teeth to be tip and/or root-relieved. Also, there exists an option for using either linear or parabolic relief. In addition to the presentation of optimal profile modifications, the effects of off-design loads, nonoptimum modifications, and random spacing errors are presented.

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He, Rong, Peter Tenberge, Xiangyang Xu, Hongwu Li, Ray Uelpenich, Peng Dong et Shuopeng Wang. « Study on the optimum standard parameters of hob optimization for reducing gear tooth root stress ». Mechanism and Machine Theory 156 (février 2021) : 104128. http://dx.doi.org/10.1016/j.mechmachtheory.2020.104128.

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Deptuła, A., et M. A. Partyka. « Inductive Decision Tree Analysis of the Validity Rank of Construction Parameters of Innovative Gear Pump after Tooth Root Undercutting ». International Journal of Applied Mechanics and Engineering 22, n^o 1 (1 février 2017) : 25–34. http://dx.doi.org/10.1515/ijame-2017-0002.

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Abstract The article presents an innovative use of inductive algorithm for generating the decision tree for an analysis of the rank validity parameters of construction and maintenance of the gear pump with undercut tooth. It is preventet an alternative way of generating sets of decisions and determining the hierarchy of decision variables to existing the methods of discrete optimization.

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Li, Xue Yi, San Shuai Li, Shou Bo Jiang et Pei Si Zhong. « Research on Bending Fatigue of Cylindrical Gear Based on ANSYS Workbench ». Applied Mechanics and Materials 88-89 (août 2011) : 647–51. http://dx.doi.org/10.4028/www.scientific.net/amm.88-89.647.

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Based on the bending fatigue properties of cylindrical gear pair, the worst meshing positions on driving and driven gears are respectively determined, the corresponding S-N curve for bending fatigue and loading spectrum of tooth root bending stress are obtained. Then a method for analyzing the bending fatigue of the cylindrical gear by ANSYS Workbench is studied and the simulation is carried out. Different from the traditional methods, the bending fatigue characteristic parameters such as safety coefficients and fatigue sensitive coefficients for every part of the tooth can be precisely calculated by finite element method. It provides an important basis for reliability design and structural optimization of the cylindrical gear pair.

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Sun, Qiang, Yuehai Sun et Lun Li. « Strength analysis and tooth shape optimization for involute gear with a few teeth ». Advances in Mechanical Engineering 10, n^o 1 (janvier 2018) : 168781401775195. http://dx.doi.org/10.1177/1687814017751957.

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As a result of the inadequate carrying capacity and poor meshing performance of gears with a few teeth, the reasonable and optimal choice of parameters is a key step in design. Aiming at this problem, the stress equation for gear pairs with a few teeth was derived and it is discovered that the main failure mode of gears with a few teeth is pitting on contacting surface. At the same time, the results of theoretic analysis were also verified by strength test. A new optimization method of parameters which aimed at minimizing the contact stress was presented based on equal bending fatigue life at the tooth root of pinion and gear. The equation was solved by the genetic algorithm and reasonable design parameters are obtained. Tooth contact analysis based on finite element method is carried out and the results demonstrated that the method presented was an effective way to enhance the carrying capacity and meshing performance of gear pair with a few teeth. The study in this article laid a solid foundation for the further promotion of gear transmission with a few teeth.

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Mitwalli, Heba, Rashed Alsahafi, Abdulrahman A. Balhaddad, Michael D. Weir, Hockin H. K. Xu et Mary Anne S. Melo. « Emerging Contact-Killing Antibacterial Strategies for Developing Anti-Biofilm Dental Polymeric Restorative Materials ». Bioengineering 7, n^o 3 (30 juillet 2020) : 83. http://dx.doi.org/10.3390/bioengineering7030083.

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Polymeric materials are the first choice for restoring tooth cavities, bonding tooth-colored fillings, sealing root canal systems, and many other dental restorative applications. However, polymeric materials are highly susceptible to bacterial attachment and colonization, leading to dental diseases. Many approaches have been investigated to minimize the formation of biofilms over polymeric restorative materials and at the tooth/material interfaces. Among them, contact-killing compounds have shown promising results to inhibit dental biofilms. Contact-killing compounds can be immobilized within the polymer structure, delivering a long-lasting effect with no leaching or release, thus providing advantages compared to release-based materials. This review discusses cutting-edge research on the development of contact-killing compounds in dental restorative materials to target oral pathogens. Contact-killing compounds in resin composite restorations, dental adhesives, root canal sealers, denture-based materials, and crown cements have all demonstrated promising antibacterial properties. Contact-killing restorative materials have been found to effectively inhibit the growth and activities of several oral pathogens related to dental caries, periodontal diseases, endodontic, and fungal infections. Further laboratory optimization and clinical trials using translational models are needed to confirm the clinical applicability of this new generation of contact-killing dental restorative materials.

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Chen, Bing, Zheng Tian et Zhong Jun Yin. « Analysis and Simulation on Dynamic Stress of Tracked Vehicle Sprocket Based on Rigid-Flexible Coupling ». Advanced Materials Research 199-200 (février 2011) : 1358–61. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1358.

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This paper established a high-speed tracked vehicle dynamics model, and simulated the transient response of sprocket when the vehicle is running at 60km/h on the D class road. the finite element model of the single tooth in mesh is established in Ansys and the rigid-flexible coupling model of "trackboard- sprocket" is established in RecurDyn. The dynamic stress and strain fringe of the sprocket’s gear ring is achieved by analysis. Simulation results show that the stress of tracked vehicle sprocket gear root and the fixed gear bolt hole is larger, and the stress concentration is detected at the edge of contacted tooth. The simulation results provide the calculation basis for the optimization of the high-speed tracked vehicle system and its lifespan prediction.

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Cheng, Xiu Quan, Ling Yan Sun et Qin Xiang Xia. « Processing Parameters Optimization for Stagger Spinning of Trapezoidal Inner Gear ». Advanced Materials Research 189-193 (février 2011) : 2754–58. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2754.

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Spin-forming of trapezoidal inner gear is a new technology of the near-net forming in gear manufacturing field. Processing parameters, such as the initial thickness of blank and radial reductions of each roller, greatly influence the forming quality of spun part. The forming quality of trapezoidal inner gear involves the filling status of gear tooth and dimensional accuracy of root circle. An approach for processing parameter optimization of the forming quality of the trapezoidal inner gear stagger spinning is proposed. The proposed approach integrates the orthogonal experiment design, gray relational analysis, and analysis of variance (ANOVA). The experiment result indicates that the proposed approach is effective in determining the optimized processing parameters for the stagger spinning of trapezoidal inner gear.

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Zhang, Qi, Guang Wen, Shuang Liang, Qin Tong, Li Hou et Guangchun Yang. « Prediction Mathematic Model and Influencing Factors of Contact Stress of Cylindrical Gear with Arc Tooth ». Complexity 2020 (3 novembre 2020) : 1–15. http://dx.doi.org/10.1155/2020/8888407.

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Given the absence of a theoretical formula to analyze the influence of parameters on the contact stress of cylindrical gear with arc tooth, an explicit mathematical model of cylindrical gear with arc tooth between the design parameters and the contact stress is established based on Kriging surrogate model. The parameters of the variation function of Kriging model are optimized by using the whale optimization algorithm (WOA), and the explicit mathematical model accuracy between the design parameters and the contact stress of the gear is in turn optimized by the improved Kriging surrogate model. The influence of design parameters on the contact stress of cylindrical gear with arc tooth is analyzed based on the established mathematical model. The proposed algorithm was realized via the programming platform MATLAB; the simulation results indicate that the precision evaluation indexes (the correlation coefficient (R2), root mean square error (RMSE), and the relative maximum absolute error (RMAE)) of the proposed Kriging model are improved, in addition to the error range which is narrowed from (−2, 4) to (0, 3). As the tooth width, modulus, pressure angle, and tooth line radius increased, the contact stress of the cylindrical gear with arc tooth gear declined, which was negatively correlated with the design parameter. The amplitude of contact stress of the cylindrical gear with arc tooth was the largest due to the change of tooth radius, followed by the change of modulus, while the influence of tooth width was less. Finally, the influence of modulus-tooth line radius interaction and pressure angle-tooth line radius interaction on contact stress of cylindrical gear with arc tooth was significant.

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Osiński, P., A. Deptuła et M. A. Partyka. « Discrete optimization of a gear pump after tooth root undercutting by means of multi-valued logic trees ». Archives of Civil and Mechanical Engineering 13, n^o 4 (décembre 2013) : 422–31. http://dx.doi.org/10.1016/j.acme.2013.05.001.

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WANG, Yu-ning, Zhang Zhao-gang, Lin Yi-zhen et Yin Ming-ang. « Dynamic Analysis of Shaft Structure Based on ANSYS/LS-DYNA ». MATEC Web of Conferences 179 (2018) : 01019. http://dx.doi.org/10.1051/matecconf/201817901019.

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In this study, a part of the shafting structure of the accessory transmission system consisting of shaft-gear-bearing is studied. ANSYS/LS-DYNA explicit dynamics simulation software is used to simulate the dynamics of the shaft structure. It compares and analyzes the overall shaft structure, gears and bearings. The simulation results show that: The place where the equivalent stress of the shaft structure is relatively large is mainly concentrated at the tooth root and the tooth surface, where the stress is mainly in the vicinity of two or three teeth. With the change of time, the maximum equivalent stress value and position of the rolling elements are also correspondingly changed, it provides a reference for the design and optimization of gear and bearing in the actual assembly process for transmission system.

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Paucker, Tobias, Michael Otto et Karsten Stahl. « A precise prediction of the tooth root stresses for involute external gears with any fillet geometry under consideration of the exact meshing condition ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 233, n^o 21-22 (2 mai 2019) : 7318–27. http://dx.doi.org/10.1177/0954406219846150.

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An environmentally friendly design of gearboxes means to increase the utilization of material steadily. This leads to in many ways optimized constructions, which require an exact prediction of occurring stresses under given load-carrying capacity to guarantee sufficient endurance. This paper shows a very precise method to calculate the occurring tooth root stress for involute, external gearings with any form of fillets within a few seconds. A two-dimensional Boundary–Element–Model is used to receive the notch stresses of the fillets which are linked to a high quality analytical tooth contact analysis to consider the exact relations of the gear meshing. The introduced model also allows a calculation of the occurring tension and compression stresses along the whole fillet for different meshing positions. This paper shows the optimization potential by using the described method in comparison to a standard approach.

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Lagresle, C., M. Guingand, J.-P. de Vaujany et B. Fulleringer. « Optimization of tooth modifications for spur and helical gears using an adaptive multi-objective swarm algorithm ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 233, n^o 21-22 (14 juin 2019) : 7292–308. http://dx.doi.org/10.1177/0954406219856373.

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Metaheuristic methods have proved to be suitable for solving complex multi-criteria optimization problems. In this paper, a modified particle swarm algorithm has been implemented in order to improve the quasi-static behavior of a power transmission gearbox, thus optimizing various objectives such as the maximum contact pressure on the gear flanks, the root-mean-square of the loaded transmission error signal, the tooth bending stress, and/or the pressure-speed factor. For narrow-faced spur gears, the comparison between optimal solutions found by the algorithm and the so-called master curve shows quite good agreements. The chosen form of the profile modifications, linear or quadratic, is then discussed. Finally, the robustness of the optimal solutions is tested to guarantee their efficiency against variable shaft misalignments.

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Wan, Lirong, Dejian Ma et Xin Zhang. « Research on Meshing Characteristics of Shearer Walking Wheel Based on Rigid-Flexible Coupling ». Mathematical Problems in Engineering 2020 (30 juillet 2020) : 1–11. http://dx.doi.org/10.1155/2020/8301086.

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Frequent failure of the walking wheel seriously restricts the performance of the whole shearer. To reduce the failure rate and improve the working performance of the walking wheel, the meshing characteristics of the tooth pin are researched. The dynamic state equations of the walking wheel and the contact force model of tooth pin meshing are established. The rigid-flexible coupling simulation model of tooth pin meshing is built. The load distribution characteristics of the walking wheel are analyzed, as well as the effects of impact load amplitude and duration. Results show that the curve of the longitudinal load distribution coefficient (Kβ) of the contact area is W-shaped, with a maximum of 1.325 at the moment of a single tooth contact. The end of the transition curve is the most serious position of the longitudinal load imbalance at the tooth root. In addition, on the impact moment, Kβ tends to decrease and maximum stress obviously increases with the increase in impact load under 40%; the material at the contact position will fail under an extra 39% instantaneous impact load. Furthermore, with the impact load of 30%, the influence of load impact duration under 0.5 s on the meshing characteristics of the walking wheel is relatively faint. The results provide some guidance for the design optimization of the walking wheel and provide a reference for improving the reliability of the shearer.

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Wang, Xigui, Yongmei Wang, Junpeng Shao, Yixiang Liu, Xue Zhou et Mingli Zhou. « Multi-objective optimization of tooth surface based on minimum of flash temperature and vibration acceleration root mean square ». Advances in Mechanical Engineering 10, n^o 5 (mai 2018) : 168781401877472. http://dx.doi.org/10.1177/1687814018774727.

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Lindholm, Per, et Jian Qin. « Evaluation of Mechanical and Thermal Stresses in Polymer Gear Teeth through Simulation Approach ». Applied Mechanics and Materials 302 (février 2013) : 468–73. http://dx.doi.org/10.4028/www.scientific.net/amm.302.468.

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One way to achieve lightweight and lubricant-free drive train is, among others, to convert conventional steel to polymer composite materials. This paper describes a part of this endeavor by taking a spur gear pair as a study object. One of the steel gear wheel is replaced with three different materials including Victrex PEEK 650G, Victrex PEEK 650CA30 and Luvocom PEEK 1105-8165 while keeping the gear geometry unchanged. Mechanical stresses and thermal properties are two major criteria for material selection at this stage. Therefore carbon fiber filled PEEK (Victrex PEEK 650CA30) and PEEK filled with thermal conductive minerals (Luvocom 1105-8165) are chosen to benchmark each of the criterion. The evaluation is done by modeling the gear mesh and analyzing the contact forces and heat generated in the gear tooth. The results show surface temperature on the tooth flanks, root tensional stress and contact pressure during the tooth mesh. The work suggests a guideline of materials selection. Depending on actual application a compromisation between mechanical and thermal properties often needs to be considered within the tolerance boundary in order to obtain optimized results. This work only deals with material selection. Gear design such as optimization of tooth geometry for polymer gears is out of the scope of this study and will not be discussed.

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Chen, Li, Yong Hai Sun et Yang Liu. « The Parameters Optimization of Bionic Tongue Block Based on the Discrete Element Method ». Advanced Materials Research 926-930 (mai 2014) : 3298–301. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.3298.

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Human tongue has complex structure and involves in chewing function, such as transporting and mixing foods. In order to develop tongue block of the bionic chewing equipment to make the food materials slide from the lingual surface to the tooth surface as much as possible in the same time, three-dimensional model of tongue block was built according to the geometric shape and physiology characteristic of the human tongue. The discrete element method was used to simulate the whole delivery process of food materials to teeth area, and then the geometrical parameters of the tongue block were optimized. The simulated results showed that when the height of the tongue tip and the tongue root were fixed, the optimal slope angles which have the decisive effect on the process of food materials slide were 32°and 2° respectively. The results provided a theoretical basis for the processing of tongue block of the bionic chewing equipment.

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Forna, Norina, et Doriana Agop-Forna. « Esthetic aspects in implant-prosthetic rehabilitation ». Medicine and Pharmacy Reports 92 (13 décembre 2019) : S6—S13. http://dx.doi.org/10.15386/mpr-1515.

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The esthetic component is critical for the successful outcome and patients’ satisfaction regarding the implant-prosthetic therapy. The esthetic outcome success depends mostly on the optimization of the algorithms specific to the pro-implant and implant stage as well as to the designing and technological execution of the future prosthetic restoration. A proper planning of optimal facial esthetics must involve a multidisciplinary approach with inclusion of periodontists, orthodontists, oral surgeons and implantology specialists. The dental practitioner must consider various factors that influence the esthetic outcome (tooth position, root position of the adjacent teeth, biotype of the periodontium, tooth shape, smile line, implant site anatomy, implant positioning). Also, some factors (anatomical limits of the implant site, periodontal status, occlusal parameters), which can alter the final esthetic result, must be assessed prior to planning the esthetic parameters of the future prosthetic restoration. The esthetic outcome can be improved by using new digital technologies based on software applications for assessment of clinical and biological indices of the prosthetic field, virtual planning of implants positioning and design projection of future prosthetic restoration.

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Kim, Min Guk, et Chan Ho Park. « The Topographical Optimization of 3D Microgroove Pattern Intervals for Ligamentous Cell Orientations : In Vitro ». International Journal of Molecular Sciences 21, n^o 24 (8 décembre 2020) : 9358. http://dx.doi.org/10.3390/ijms21249358.

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Specific orientations of periodontal ligaments (PDLs) to tooth-root surface play an important role in offering positional stabilities of teeth, transmitting and absorbing various stresses under masticatory/occlusal loading conditions, or promoting tissue remodeling by mechanical stimulations to periodontal cells. However, it is still challenging to spatially control PDL orientations and collective PDL cell alignments using 3D scaffold architectures. Here, we investigated the optimization of scaffold topographies in order to control orientations of human PDL cells with predictability in in vitro. The 3D PDL-guiding architectures were designed by computer-aided design (CAD) and microgroove patterns on the scaffold surfaces were created with four different slice intervals such as 25.40 µm (μG-25), 19.05 µm (μG-19), 12.70 µm (μG-12), and 6.35 µm (μG-6) by the digital slicing step. After scaffold design and 3D wax printing, poly-ε-caprolactone (PCL) was casted into 3D printed molds and human PDL cells were cultured for 7 days. In the results, μG-25 with low vertical resolution can angularly organize seeded cells predictably rather than μG-6 created by the highest resolution for high surface quality (or smooth surface). Moreover, nuclear orientations and deformability were quantitatively analyzed and a significant correlation between microgroove pattern intervals and cell alignments was calculated for the topographic optimization. In conclusion, controllable microgroove intervals can specifically organize human PDL cells by 3D printing, which can create various surface topographies with structural consistence. The optimal surface topography (μG-25) can angularly guide human PDL cells, but 6.35 µm-thick patterns (μG-6) showed random organization of cell collectivity.

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El Yousfi, Bilal, Abdenour Soualhi, Kamal Medjaher et François Guillet. « A New Analytical Method for Modeling the Effect of Assembly Errors on a Motor-Gearbox System ». Energies 14, n^o 16 (14 août 2021) : 4993. http://dx.doi.org/10.3390/en14164993.

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The well-known gear tooth defects such as root cracks and flank spalls have been widely investigated in previous studies to model their effects on the time varying mesh stiffness (TVMS) and consequently the dynamic response of motor-gearbox systems. Nevertheless, the effect of assembly errors such as the center distance and the eccentricity has been less considered in past works. Determining the signature of these errors on the system response can help for their early detection and diagnostic to avoid overloading and failure of gears. An original geometric-based method combined with the potential energy method is proposed in this paper to accurately model the effect of these assembly errors on the TVMS of mating spur gear pairs. This is achieved by updating the line of action equation (LOA) at each meshing step using the actual coordinates of gear centers and employing a contact detection algorithm (CDA) to determine the actual contact points coordinates. An electrical model of a three-phase induction machine was then coupled with a dynamic model of a one-stage spur gear system to simulate the effect of assembly errors on the electromechanical response of the motor-gearbox system. The simulation results showed that the center distance error induces a reduction in the TVMS magnitude and the contact ratio, whereas the eccentricity error causes a double modulation of the TVMS magnitude and frequency. In addition, the results showed that assembly errors can be detected and diagnosed by analyzing the system vibration and the motor phase-current.

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Yamamoto, Ei, Nobuhiro Kato, Yuka Hatoko et Shigeki Hontsu. « Optimization of Humid Conditions Using an Ultrasonic Nebulizer for the Fabrication of Hydroxyapatite Film with the Er:YAG Laser Deposition Method ». Key Engineering Materials 720 (novembre 2016) : 269–74. http://dx.doi.org/10.4028/www.scientific.net/kem.720.269.

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Restoration and maintenance of tooth substance are primary concerns in operative dentistry. Intact tooth is mainly composed of hydroxyapatite (HAp). However, there are no practical HAp materials for the treatment of tooth decay and hypersensitivity. We have newly proposed and developed a tooth restoration technique with intraoral laser ablation using an Er:YAG laser in order to form the HAp thin film on tooth surface in the atmosphere at room temperature. However, the fabricated HAp film is not uniform for the present due to the unsettled water condition at the material surface during the laser ablation. In the present study, we tried to optimize the humid condition using a nebulizer for the fabrication of HAp layer with the Er:YAG laser deposition method. The HAp layers were fabricated on a titanium substrate while changing the flow rate of water mist in order to determine the relationship between the spraying amount and the HAp layer structure. It is revealed that there exists the optimal humid condition to fabricate the uniform hydroxyapatite coating film with the Er:YAG laser deposition method.

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Tang, Ting, Hang Jia, Junyang Li, Jiaxu Wang et Xingyu Zeng. « Modeling of Transmission Compliance and Hysteresis Considering Degradation in a Harmonic Drive ». Applied Sciences 11, n^o 2 (12 janvier 2021) : 665. http://dx.doi.org/10.3390/app11020665.

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Transmission compliance and hysteresis behaviors are associated with harmonic drives. The experimental observation of a harmonic drive showed that these behaviors are significantly degraded with increasing service time, and their accurate modeling is expected to improve the performance of the control system of harmonic drive-based devices such as robot manipulators. In this paper, a new model is proposed to capture transmission compliance and hysteresis and their degradation. The phenomenon is represented through a combination of the nonlinear stiffness component and the micro-sliding friction in the tooth engagement area. The proposed model considered the multi-tooth meshing and the interference effects of the reducer. The parameters of the model were identified using optimization techniques. Numerical simulations and experimental data using a specialized harmonic drive test device were compared to demonstrate the proposed model.

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Qin, Haojie, Yuwen Li et Xiong Xiong. « Workpiece Pose Optimization for Milling with Flexible-Joint Robots to Improve Quasi-Static Performance ». Applied Sciences 9, n^o 6 (13 mars 2019) : 1044. http://dx.doi.org/10.3390/app9061044.

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Although industrial robots are widely used in production automation, their applications in machining have been limited because of the structural vibrations induced by periodic cutting forces. Since the dynamic characteristics of an industrial robot depends on its configuration, the responses of the robot structure to the cutting forces are affected by how the workpiece is placed within the workspace of the robot. This paper presents a method for workpiece pose optimization for a robotic milling system to improve the quasi-static performance during machining. Since the milling forces are time-varying due to the characteristics of the multi-tooth and discontinuity of milling, these forces can excite vibrations inside the robot structure. To address this issue, a structural dynamics model is established for industrial robots, considering their joint flexibility, and a milling force formulation is incorporated into the robot dynamics model to investigate the forced vibrations of the flexible joints. Then, the quasi-static performance of the robotic machining system is evaluated by the vibration-induced offset of the cutter tool that is mounted on the end-effector. Finally, an optimization approach is given for the workpiece pose to minimize the cutter tool offset under the periodic milling force. A numerical simulation demonstrates that the optimal workpiece pose can significantly reduce the overall tool offset during machining and can lower the variation of the tool offset along the milling path.

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Fan, Qi. « Optimization of Face Cone Element for Spiral Bevel and Hypoid Gears ». Journal of Mechanical Design 133, n^o 9 (1 septembre 2011). http://dx.doi.org/10.1115/1.4004546.

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In the blank design of spiral bevel and hypoid gears, the face cone is defined as an imaginary cone tangent to the tops of the teeth. Traditionally, the face cone element or generatrix is a straight line. On the other hand, the tooth root lines, which are traced by the blade tips, are normally not straight lines. As a result, the tooth top geometry generally does not fit the mating member’s real root shape, providing an uneven tooth root-tip clearance; additionally, in some cases root-tip interference between the tooth tip and the root tooth surfaces of the mating gear members may be observed. To address this issue, this paper describes a method of determining an optimized face cone element for spiral bevel and hypoid gears. The method is based on the incorporation of calculation of tooth surface and root geometries, the conjugate relationship of the mating gear members, the ease-off topography, and the tooth contact analysis. The resulting face cone element may not be a straight line but generally an optimized curve that, in addition, to avoidance of the interference, offers maximized contact ratio and even tooth root-tip clearance. Manufacturing of bevel gear blanks with a curved face cone element can be implemented by using computer numerically controlled machines.

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Peng, Bo, Yang Luo, Yuanxin Luo et Ziyong Ma. « Geometry optimization of the rolling tool for gear roll-forming process ». Proceedings of the Institution of Mechanical Engineers, Part B : Journal of Engineering Manufacture, 28 août 2020, 095440542095110. http://dx.doi.org/10.1177/0954405420951101.

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Gear roll forming process is an innovative near-net-shape gear manufacturing technology for efficient manufacturing, high material utilization rate, high products strength, and outstanding surface quality. The profile of the Tooth of the Rolling Tool (TRT) has a direct impact on its strength/stiffness which further affects its life duration and the accuracy of the formed products. Research has been carried out to design the involute curve of TRT, however, the transaction curve of TRT which also has a significant impact on tooth strength and service durability remains to be designed and optimized in order to further improve the rolling performance. In this paper, an elliptical gear tooth root transaction curve is proposed to replace the traditional fillet curve for the enhancement of tooth bending performance. The maximum root stress and stiffness of the gear tooth with elliptical transaction curve are calculated and compared to the standard profile with different parameters (modulus, pressure angle, and coefficient of bottom clearance). The results show that proposed elliptical tooth reduces the maximum root stress and increase the strength and stiffness of TRT especially significant for rolling tools with small number of teeth and coefficient of bottom clearance.

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« Investigation of the Nominal Tooth Root Stress for External, Cylindrical Gears with Symmetric and Asymmetric Profile ». WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS 15 (12 mars 2020). http://dx.doi.org/10.37394/232011.2020.15.5.

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The determination of tooth bending strength is a basic issue in gear design. This work presents the change of nominal tooth root stress of external toothed, cylindrical gears depending on the geometry used. The nominal tooth root stress is analyzed with using finite element simulations. The numerical calculations are executed in Abaqus. The imported geometries are produced by our own program in MATLAB. The boundary conditions to the models are defined accordance with the most significant analytical methods used in practice. This approach allows mapping direct correlation analysis by these calculations. The optimization of computational capacity used is also considered. In addition to the examination of the significant tooth stress value of symmetrical element pairs, the position of the critical cross-section is also analyzed. The effect of the asymmetric design of the tooth profile on the nominal tooth root stress is also presented in our investigations. The purpose of the numerical simulations carried out here is to determine the effect of the coast side angle on the magnitude of the significant tooth root stress and the position of the critical cross-section.

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Han, Lin, et Yang Qi. « Recent Progress and Prospect on Tooth Modification of Involute Cylindrical Gear ». Recent Patents on Mechanical Engineering 14 (15 avril 2021). http://dx.doi.org/10.2174/2212797614666210415111613.

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Background: Recent reviews on tooth modification of involute cylindrical gear are presented. Gear pairs are widely employed in motion and power transmission systems. Manufacturing and assembling errors of gear parts, time-varying mesh stiffness and transmission error of gear pair, usually induce vibration, noise, non-uniformly load distribution and stress concentration, resulting in earlier failure of gear. Tooth modification is regarded as one of the most popular ways to suppress vibration, reduce noise level, and improve load distribution of gear pairs. Objective: To provide an overview of recent research and patents on tooth modification method and technology. Methods: This article reviews related research and patents on tooth modification. The modification method, evaluation, optimization and machining technology are introduced. Results: Three types of modifications are compared and analyzed, and influences of each on both static and dynamic performances of gear pair are concluded. By summarizing a number of patents and research about tooth modification of cylindrical gears, the current and future development of research and patent are also discussed. Conclusion: Tooth modification is classified into tip or root relief along tooth profile, lead crown modification along tooth width and compound modification. Each could be applied in different ways. In view of design, optimization under given working condition to get optimal modification parameters is more practical. Machining technology and device for modified gear is a key to get high quality performance of geared transmission. More patents on tooth modification should be invented in future.

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