Relevant bibliographies by topics / Nutation speed reducer

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  2. Conference papers

Academic literature on the topic 'Nutation speed reducer'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Nutation speed reducer"

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Jasem, MA, and P. Ya Krauinsh. "Features of the Engagement of the Nutation Speed Reducer." Journals of Advances in Electrical Devices 4, no. 3 (2019): 27–32. https://doi.org/10.5281/zenodo.3559588.

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<em>This paper discusses the development of a Nutating Speed Reducer (NSR), which is characterized by high reduction ratio, high tooth contact ratio, very high torque to weight/ volume ratio, quiet and smooth operation under load and very high efficiency. All of these advantages are due to the presence of conjugate face-gear pairs, which incorporate each other, which is called nutating/rotating gear mechanism. Details of the NSR, its kinematics, gear tooth load capacity, and mesh efficiency are explained. The general formulae for calculating the reduction ratio and main design parameters of the novel gear drive are developed. The smooth running of the NSR is examined without applying any load. The operability of the NSR under load is carried out in a virtual simulation environment to verify the transmission theory and the smoother transmission between pairs of teeth of the nutation speed reducer.</em>
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Jasem, M. A., and P. Y. Krauinsh. "Kinematical analysis of the nutation speed reducer." IOP Conference Series: Materials Science and Engineering 510 (April 24, 2019): 012022. http://dx.doi.org/10.1088/1757-899x/510/1/012022.

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3

Ali, Jasem Mohamad, and Krauinsh Peter Yanovich. "Analysis of the Stress-strain State (SSS) Under Static Load of Nutation Speed Reducer." Journal of Advanced Research in Dynamical and Control Systems 11, no. 10 (2019): 137–41. http://dx.doi.org/10.5373/jardcs/v11i10/20193016.

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Shen, Qing-ming, Li-jun Yan, Jian-zhong Zhao, et al. "Projectile-Artillery-Propellant Coupled Optimization Design Method of Artillery Weapon Systems." Journal of Physics: Conference Series 2460, no. 1 (2023): 012047. http://dx.doi.org/10.1088/1742-6596/2460/1/012047.

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Abstract The artillery weapon system is a complex system of great non-linearity. There are many factors and their coupling relationship affecting the firing performance of artillery, and the key factor positioning is difficult. How to improve the firing performance of artillery through optimization is a challenge. The current optimization method considers less coupling factors. To approach this challenge, a projectile-artillery-propellant coupled optimization design method is proposed, where a multidisciplinary coupling of projectiles, artillery and propellant is proposed and used to construct an optimization model, and the minimum initial disturbance is taken as the optimization objective. The simulation results show that at the moment when the projectile exist the muzzle, the optimized muzzle vibration displacement is reduced by 47.6%, the muzzle vibration speed is reduced by 33.4%, the average nutation angle is reduced by 63%, the average nutation angular speed is reduced by 27%.
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Nelson, Carl A., and Raymond J. Cipra. "Similarity and Equivalence of Nutating Mechanisms to Bevel Epicyclic Gear Trains for Modeling and Analysis." Journal of Mechanical Design 127, no. 2 (2005): 269–77. http://dx.doi.org/10.1115/1.1829068.

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This paper addresses similarities between various nutating or wobbling mechanisms, in particular kinematic similarities. A case is made for the generalization of these mechanisms into a mechanism “class” having common kinematic characteristics, which is typified by bevel epicyclic gear trains. A similarity index is proposed to describe the quality of kinematic similarity, with the best degree of similarity termed “equivalence.” It is proposed that kinematic analysis of mechanisms belonging to this “class” can be simplified by modeling them as bevel-gear trains, and that static-force, power-flow, and efficiency analyses can also be greatly simplified in the case of “equivalent” mechanisms. Simplified kinematic, force, and efficiency analyses are demonstrated for a unique wobbling speed reducer using this new concept of equivalent geared mechanisms.
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Wu, Xuemei, Weimin Tang, Ao Zhong, and Jun Zhang. "Kinematic analysis, structural design and prototype verification for the single-stage nutation drive." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, February 13, 2025. https://doi.org/10.1177/09544062251316779.

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Nutation drive has advantages of large transmission ratio, high load-bearing capacity and compact structure, making it a promising solution for precise transmission in various fields such as industrial robots, electric vehicles, and space explorations. However, the nutation drive would be difficult to adapt to the design requirements of different application scenarios because of lacking reliable and easy-to-use design methods. The primary reason for the lack of design methodology lies in the insufficient understanding in kinematic mechanism of the nutation drive. To solve this problem, the present work aims to reveal the motion transmission mechanism of nutation drive and to provide a universal structural design methodology. First, angular velocity analyses for two typical single-stage nutation drives are carried out, clarifying the velocity of each key component in the nutation drive. Second, the transmission ratios of two kinds of nutation drives are derived, respectively. Third, the relationships between the kinematic characteristics and structural parameters of single-stage nutation drive are established and a design process for key structural parameters is subsequently proposed. Then, a case study based on the proposed design methodology is conducted to yield the detail structure of a single-stage nutation drive. Finally, a prototype of single-stage nutation drive is fabricated and its transmission ratio is tested. The testing results show that the average transmission ratio of the nutation reducer is −14.89 and its relative error is just −0.70% compared with theoretical one, while the average fluctuation of the transmission ratio is 0.86 with a relative error of 5.76%. It means that the proposed nutation drive has the potential for stable transmission with low speed fluctuations. The proposed kinematic analysis model and design method is verified.
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7

Pan, Ling, Zhiqiang Yin, Bin Lin, Yi Zeng, and Jun Zhang. "Non-Newtonian thermal elastohydrodynamic mixed lubrication in elliptical contact for nutation-driven double circular-arc spiral bevel gear pair." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, May 13, 2024. http://dx.doi.org/10.1177/13506501241253043.

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The new type of nutation reducer with double circular-arc bevel gears as the core is characterized by advantages such as high load-bearing capacity, large transmission ratio, and simple structure. The existing research focuses on the machining methods of gears and the analysis of tooth contact. This article first time establishes an elastohydrodynamic mixed lubrication model for nutation double circular-arc bevel gear. The model's accuracy is verified by comparing it with existing test results. On this basis, combined with the finite element method and tooth contact analysis, the meshing characteristics, tooth contact characteristics, and lubrication characteristics of the double circular-arc bevel gear tooth surface are analyzed. The results show that the entrainment velocity at the contact point of the tooth surface during transmission is much higher than the sliding velocity. Consequently, the meshing motion is close to pure rolling. In constant-speed transmission, the oil film thickness at the engaging-in and exit points near the edge of the tooth surface is smaller than that at other meshing points on the tooth surface. This phenomenon can easily lead to mixed lubrication and lubrication failure, as well as tooth surface wear. During deceleration, i.e., when the speed drops to 50 r/min, the oil film thickness approaches zero, indicating that the gear has entered a mixed lubrication state. The proposed model can be used for lubrication analysis and improving transmission accuracy of nutation double circular-arc bevel gears.
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Conference papers on the topic "Nutation speed reducer"

1

Cameron, Zachary, Edward Smith, Hans DeSmidt, and Robert Bill. "Design Space Exploration of Pericyclic Transmission with Counterbalance and Bearing Load Analysis." In Vertical Flight Society 74th Annual Forum & Technology Display. The Vertical Flight Society, 2018. http://dx.doi.org/10.4050/f-0074-2018-12857.

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The pericyclic transmission provides the opportunity to vastly impact transmission design in rotorcraft due to its ability to provide exceedingly high reduction ratios in a single stage that would normally require multiple gear stages. This could lead to lighter transmissions with fewer components, increased reliability, efficiency, speed and decreased cost to maintain. While many previous studies have focused upon the gearing within the pericyclic transmission, this work focused on what influences pericyclic geometry, and how changes in geometry impact bearing loads. Specifically, the loading of bearings that must deliver power from the input shaft to the nutating and rotating gears of the system were of primary concern. A comprehensive look at dynamic loads generated by nutating bodies was performed. Methods to address these dynamic loads via application of counterbalances, and deviation from conventional pericyclic transmission designs were utilized to negate the dynamic moment of concern. Counterbalances negating the dynamic moment were shown to weigh between 30-50% of the pericyclic motion converter gears in a 40:1 reduction ratio pericyclic design at 12,000 rpm input speed and reduced applied moments by three orders of magnitude. Finally, a static solver was used to determine the bearing loads with updated component geometries and mass moment of inertias that included the required counterbalances.
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2

Nelson, Carl A., and Raymond J. Cipra. "Similarity and Equivalence of Nutating Mechanisms to Bevel Epicyclic Gear Trains." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/dac-48843.

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This paper addresses similarities between various nutating or wobbling mechanisms, especially kinematic similarities. A case is made for the generalization of several mechanisms into a mechanism “class” having common kinematic characteristics. This mechanism class is shown to be typified by bevel epicyclic gear trains. It is proposed that not only kinematic analysis, but static-force, power-flow, and efficiency analyses of mechanisms belonging to this “class” can be simplified by modeling them as bevel-gear trains. Simplified kinematic, force, and efficiency analyses are demonstrated for a novel wobbling speed reducer using this concept of “equivalent” geared mechanisms. The reduction in complexity of these analyses is the main motivation for this work.
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FIOT, AURÉLIEN, SÉBASTIEN CHANGEY, RONAN ADAM, and NICOLAS PETIT. "ESTIMATION OF THE VELOCITY OF A PROJECTILE USING RADIAL ACCELEROMETERS—VALIDATION ON 155 MM FREE FLIGHT TEST." In 32ND INTERNATIONAL SYMPOSIUM ON BALLISTICS. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/ballistics22/36124.

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This paper addresses the problem of velocity estimation for a 155 mm projectile. Indeed, to correctly feed the guidance and control algorithms of such a guided munition, it is essential to estimate its speed autonomously (without any external system) onboard and in real-time. Knowledge of the velocity (and thus the Mach number) is required to infer the aerodynamic coefficients governing its dynamics. From the analysis of the frequencies present on one of the radial accelerometers, and from a reduced 6DOF model describing the epicyclic rotation of the shell, we are able to estimate the velocity of the ammunition. The roll speed can be determined from magnetometers. For frequency estimation, we employ a subspace method of the Pisarenko type, relying on the auto-correlation matrix of the accerelometer signal. This matrix is estimated from samples and its dominant eigenvalues are related to the precession and nutation frequencies. In turn, the velocity can be estimated from the analytical values of the epicyclic motion. In this paper, we offer an efficient method to estimate the velocity of an artillery shell in free-flight, using only embedded sensors. The next step will be to use these results to improve the estimation of the projectile’s attitude and position.
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