The Experts below are selected from a list of 900 Experts worldwide ranked by ideXlab platform
Masahiko Itoh - One of the best experts on this subject based on the ideXlab platform.
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Vibration suppression control for a dies-driving spindle of a form rolling machine using a model-based control with a rotational speed sensor
International Journal of Mechatronics and Manufacturing Systems, 2010Co-Authors: Masahiko ItohAbstract:This paper deals with a control technique of eliminating the transient vibration generated in a dies-driving spindle of a form rolling machine. This technique is based on a model-based control with a rotational speed sensor. A rotational speed sensor is installed in a Driven Gear part. A control model is composed of a reduced-order mechanical model. The performance of this vibration suppression control method in the velocity control loop is examined by simulations and experiments. Further, the effectiveness of the model-based control integrated into the position control loop is verified by simulations. Simulations and experiments show satisfactory control results.
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Vibration suppression control for a dies-driving spindle of a form rolling machine: Effects of a model-based control with a rotational speed sensor II
2009 International Conference on Mechatronics and Automation, 2009Co-Authors: Masahiko ItohAbstract:This paper deals with a control technique of eliminating the transient vibration generated in a dies-driving spindle of a form rolling machine. This technique is based on a model-based control with a rotational speed sensor. A rotational speed sensor is installed in a Driven Gear, namely a bull Gear. A control model is composed of a reduced-order mechanical part expressed as a transfer function between the rotational speed of the dies and that of the bull Gear. This control model estimates a dies speed after the rotational speed of the bull Gear is acted on the transfer function. The difference between the estimated dies speed and the motor speed is calculated dynamically, and it is added to the velocity command to suppress the transient vibration generated at the dies. In this paper, the effectiveness of the model-based control in the existence of modeling error in the reduced-order model and the effectiveness of the model-based control integrated into the position control loop are verified by simulations. Simulations show satisfactory control results to reduce the transient vibration.
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Vibration suppression control for a dies-driving spindle of a form rolling machine: Effects of a model-based control with a rotational speed sensor I
2008 IEEE International Conference on Mechatronics and Automation, 2008Co-Authors: Masahiko ItohAbstract:This paper deals with a control technique of eliminating the transient vibration generated in a dies-driving spindle of a form rolling machine. This technique is based on a model-based control with a rotational speed sensor in order to establish the damping effect at the Driven machine part. A rotational speed sensor is installed in a Driven Gear, namely a bull Gear. A control model is composed of a reduced-order mechanical part expressed as a transfer function between the rotational speed of the dies and that of the bull Gear. This control model estimates a dies speed after the rotational speed of the bull Gear is acted on the transfer function. The difference between the estimated dies speed and the motor speed is calculated dynamically, and it is added to the velocity command to suppress the transient vibration generated at the dies. In this paper, the performance of this control method is examined by simulations and experiments. The settling time of the residual vibration generated at the dies can be shortened down to about 1/2 of the uncompensated vibration level.
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Vibration Suppression Control for a Dies-Driving Spindle of a Form Rolling Machine: Simulation Study on Effects of a Model-Based Control with a Rotational Speed Sensor
2007 International Conference on Mechatronics and Automation, 2007Co-Authors: Masahiko ItohAbstract:This paper deals with a control technique of eliminating the transient vibration generated in a dies-driving spindle of a form rolling machine. This technique is based on a model-based control with a rotational speed sensor in order to establish the damping effect at the Driven machine part. A rotational speed sensor is installed in a Driven Gear, namely a bull Gear. A control model is composed of a reduced-order mechanical part expressed as a transfer function between the rotational speed of the dies and that of the bull Gear. This control model estimates a dies speed after the rotational speed of the bull Gear is acted on the transfer function. The difference between the estimated dies speed and the motor speed is calculated dynamically, and it is added to the velocity command to suppress the transient vibration generated at the dies. In this paper, the performance of this control method is examined by simulations. The settling time of the residual vibration generated at the dies can be shortened down to about 1/2 of the uncompensated vibration level.
Vilmos Simon - One of the best experts on this subject based on the ideXlab platform.
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Design of face-hobbed spiral bevel Gears with reduced maximum tooth contact pressure and transmission errors
Chinese Journal of Aeronautics, 2013Co-Authors: Vilmos SimonAbstract:The aim of this study is to define optimal tooth modifications, introduced by appropriately chosen head-cutter geometry and machine tool setting, to simultaneously minimize tooth contact pressure and angular displacement error of the Driven Gear (transmission error) of face-hobbed spiral bevel Gears. As a result of these modifications, the Gear pair becomes mismatched, and a point contact replaces the theoretical line contact. In the applied loaded tooth contact analysis it is assumed that the point contact under load is spreading over a surface along the whole or part of the "potential" contact line. A computer program was developed to implement the formulation provided above. By using this program the influence of tooth modifications introduced by the variation in machine tool settings and in head cutter data on load and pressure distributions, transmission errors, and fillet stresses is investigated and discussed. The correlation between the ease-off obtained by pinion tooth modifications and the corresponding tooth contact pressure distribution is investigated and the obtained results are presented. ?? 2013 Production and hosting by Elsevier Ltd. on behalf of CSAA & BUAA.
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Loaded Tooth Contact Analysis and Stresses in Spiral Bevel Gears
Volume 6: ASME Power Transmission and Gearing Conference; 3rd International Conference on Micro- and Nanosystems; 11th International Conference on Adv, 2009Co-Authors: Vilmos SimonAbstract:The method for loaded tooth contact analysis is applied for the investigation of the influence of misalignments and tooth errors on load distribution, stresses and transmission errors in mismatched spiral bevel Gears. By using the corresponding computer program the influence of pinion’s offset and axial adjustment error, angular position error of the pinion axis and tooth spacing error on tooth contact pressure, tooth root stresses and angular displacement of the Driven Gear member from the theoretically exact position based on the ratio of the numbers of teeth is investigated. The obtained results have shown that in general, the misalignments in spiral bevel Gears worsen the conjugation of contacting tooth surfaces and in extreme cases cause edge contact with high tooth contact pressures. But, some mismatches, as are the axial movement of the pinion apex towards the Gear teeth or the tip relief of pinion teeth (in this analysis it is represented by the tooth spacing error) reduce the maximum tooth contact pressure. Also it can be concluded that the misalignments and the tooth spacing errors significantly increase the angular position error of the Driven Gear from the theoretically exact position based on the numbers of teeth and make the motion graphs unbalanced.Copyright © 2009 by ASME
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Machine-Tool Settings to Reduce the Sensitivity of Spiral Bevel Gears to Tooth Errors and Misalignments
Journal of Mechanical Design, 2008Co-Authors: Vilmos SimonAbstract:The method for loaded tooth contact analysis is applied for the investigation of the combined influence of machine-tool settings for pinion teeth finishing and misalignments of the mating members on load distribution and transmission errors in mismatched spiral bevel Gears. By using the corresponding computer program, the influence of pinion's offset and axial adjustment error, angular position error of the pinion axis, tooth spacing error, and machine-tool setting correction for pinion teeth finishing, on tooth contact pressure, tooth root stresses, and angular displacement of the Driven Gear member from the theoretically exact position based on the ratio of the numbers of teeth is investigated. On the basis of the obtained results, the optimal combination of machine-tool settings is determined. By the use of this set of machine-tool settings, the maximum tooth contact pressure and transmission errors can be significantly reduced. However, in some cases, by the use of appropriate machine-tool settings for the reduction of tooth contact pressure, the angular displacement of the Driven Gear increases. Therefore, different optimized combinations of machine-tool settings for pinion tooth finishing for the reduction of the sensitivity of Gears to misalignments in regard to maximum tooth contact pressure and transmission errors should be applied. By the use of the combination of machine-tool settings to reduce the sensitivity of Gears to misalignments in regard to transmission errors, a slight reduction of maximal tooth contact pressure is achieved, too.
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Influence of tooth errors and misalignments on tooth contact in spiral bevel Gears
Mechanism and Machine Theory, 2008Co-Authors: Vilmos SimonAbstract:The method for computer aided tooth contact analysis in mismatched spiral bevel Gears is applied for the investigation of the influence of misalignments of the mating members and tooth errors on mesh performances. By using the corresponding computer program the influence of pinion's offset and pinion's adjustment error along the pinion and Gear axis, angular position error of the pinion axis and tooth spacing error on the shape and position of path of contact and potential contact lines under load, on separations along the potential contact lines, on angular displacements of the Driven Gear member from the theoretically exact position based on the ratio of the numbers of teeth, and on the variation of the angular velocity ratio through a mesh cycle have been determined. The results obtained show that the position errors of the mating members worsen the conjugation of the contacting tooth surfaces, and considerably increase the angular displacements of the Gear member and the velocity ratio variation through the whole mesh cycle, that considerably worsens the mesh performances. ?? 2007 Elsevier Ltd. All rights reserved.
Seungbok Choi - One of the best experts on this subject based on the ideXlab platform.
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Control of a haptic Gear shifting assistance device utilizing a magnetorheological clutch
Smart Materials and Structures, 2014Co-Authors: Young Min Han, Seungbok ChoiAbstract:This paper proposes a haptic clutch Driven Gear shifting assistance device that can help when the driver shifts the Gear of a transmission system. In order to achieve this goal, a magnetorheological (MR) fluid-based clutch is devised to be capable of the rotary motion of an accelerator pedal to which the MR clutch is integrated. The proposed MR clutch is then manufactured, and its transmission torque is experimentally evaluated according to the magnetic field intensity. The manufactured MR clutch is integrated with the accelerator pedal to transmit a haptic cue signal to the driver. The impending control issue is to cue the driver to shift the Gear via the haptic force. Therefore, a Gear-shifting decision algorithm is constructed by considering the vehicle engine speed concerned with engine combustion dynamics, vehicle dynamics and driving resistance. Then, the algorithm is integrated with a compensation strategy for attaining the desired haptic force. In this work, the compensator is also developed and implemented through the discrete version of the inverse hysteretic model. The control performances, such as the haptic force tracking responses and fuel consumption, are experimentally evaluated.
Zhang Meng - One of the best experts on this subject based on the ideXlab platform.
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3D Finite Element Simulation of Rotary Forging in Spiral Bevel Driven Gear
China Metalforming Equipment & Manufacturing Technology, 2020Co-Authors: Zhang MengAbstract:Shape of spiral bevel Driven Gear is complex and rotary forging process is also difficult. Based on 3D finite element analysis under isothermal condition,the simulation was employed to examine the rotary forging process in spiral bevel Driven Gear and metal flow procedure and force-time curve and torque-time curve have been obtained.The comparison for forming force between finite element simulation and experiment shew that it was an effective method and also had a disadvantage to compute the load of rotary forging process by finite element method.Finally some questions have been presented for high-precision finite element simulation of rotary forging process in spiral bevel Driven Gear.
Chen Xindu - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation on forging technology of spiral bevel Driven Gear blank
Forging and Stamping Technology, 2020Co-Authors: Chen XinduAbstract:"Hot forging + machining"is an effective way to manufacture spiral bevel Gear.The final product's performance depends on the quality of hot forging.The finite element software Deform-3D was used to simulate the hot forging process of spiral bevel Driven Gear blank.The metal flow law of forging process was studied.The results show that the stress and strain are great and the temperature is high in the ladder place because of the metal flows difficultly in the ladder place.The flow of metal can be better by improving die parameters.The relationship between initial forging temperature and forging energy consumption was studied.The results show that the forging energy consumption changes a little when the initial forging temperature is different.The numerical simulation on forging technology can be applied to improve die patameters and forging process parameters.
