Relevant bibliographies by topics / Tooth rotation

Academic literature on the topic 'Tooth rotation'

Author: Grafiati
Published: 14 March 2023

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Journal articles on the topic "Tooth rotation"

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Alkadhimi, Aslam. "A novel and simple technique for correcting localised rotations in the early alignment stage." Journal of Orthodontics 47, no. 4 (August 27, 2020): 338–44. http://dx.doi.org/10.1177/1465312520949553.

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Correcting severe tooth rotations can be challenging. There are many ways to de-rotate teeth with fixed or removable appliances. Mechanically, the best and most effective way is one that produces a two-force couple system to rotate a tooth around its centre of rotation (longitudinal axis). The aim of this article was to introduce a simple and efficient technique using a closed coil to correct localised tooth rotations in the early alignment stage, utilising a simple two-force couple system. Furthermore, some of the biomechanical principles concerning de-rotation will be revisited.
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Kaur, Pushappreet. "Hypodontia, Microdontia and Tooth rotation: A rare clinical triad." International Journal of Dental Research 4, no. 2 (October 23, 2016): 57. http://dx.doi.org/10.14419/ijdr.v4i2.6737.

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Hypodontia, microdontia and rotations are developmental dental anomalies resulting from genetic and epigenetic disturbances during tooth initiation, morphogenesis and eruption stages; with variable effects on function and dentofacial esthetics depending upon their severity. Hypodontia and microdontia may occur in syndromic or isolated non-syndromic forms based on presence or absence of congenital defects. This article briefly reviews hypodontia, microdontia and tooth rotation; and discusses a rare case presenting combination of these anomalies along with a possible treatment proposal.
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Gholamalizadeh, Torkan, Sune Darkner, Peter Lempel Søndergaard, and Kenny Erleben. "A multi-patient analysis of the center of rotation trajectories using finite element models of the human mandible." PLOS ONE 16, no. 11 (November 15, 2021): e0259794. http://dx.doi.org/10.1371/journal.pone.0259794.

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Studying different types of tooth movements can help us to better understand the force systems used for tooth position correction in orthodontic treatments. This study considers a more realistic force system in tooth movement modeling across different patients and investigates the effect of the couple force direction on the position of the center of rotation (CRot). The finite-element (FE) models of human mandibles from three patients are used to investigate the position of the CRots for different patients’ teeth in 3D space. The CRot is considered a single point in a 3D coordinate system and is obtained by choosing the closest point on the axis of rotation to the center of resistance (CRes). A force system, consisting of a constant load and a couple (pair of forces), is applied to each tooth, and the corresponding CRot trajectories are examined across different patients. To perform a consistent inter-patient analysis, different patients’ teeth are registered to the corresponding reference teeth using an affine transformation. The selected directions and applied points of force on the reference teeth are then transformed into the registered teeth domains. The effect of the direction of the couple on the location of the CRot is also studied by rotating the couples about the three principal axes of a patient’s premolar. Our results indicate that similar patterns can be obtained for the CRot positions of different patients and teeth if the same load conditions are used. Moreover, equally rotating the direction of the couple about the three principal axes results in different patterns for the CRot positions, especially in labiolingual direction. The CRot trajectories follow similar patterns in the corresponding teeth, but any changes in the direction of the force and couple cause misalignment of the CRot trajectories, seen as rotations about the long axis of the tooth.
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Radeke, Johanna, Annike B. Vogel, Falko Schmidt, Fatih Kilic, Stefan Repky, Jan Beyersmann, and Bernd G. Lapatki. "Trueness of full-arch IO scans estimated based on 3D translational and rotational deviations of single teeth—an in vitro study." Clinical Oral Investigations 26, no. 3 (November 27, 2021): 3273–86. http://dx.doi.org/10.1007/s00784-021-04309-5.

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Abstract Objectives To three-dimensionally evaluate deviations of full-arch intraoral (IO) scans from reference desktop scans in terms of translations and rotations of individual teeth and different types of (mal)occlusion. Materials and methods Three resin model pairs reflecting different tooth (mal)positions were mounted in the phantom head of a dental simulation unit and scanned by three dentists and three non-graduate investigators using a confocal laser IO scanner (Trios 3®). The tooth-crown surfaces of the IO scans and reference scans were superimposed by means of best-fit alignment. A novel method comprising the measurement of individual tooth positions was used to determine the deviations of each tooth in the six degrees of freedom, i.e., in terms of 3D translation and rotation. Deviations between IO and reference scans, among tooth-(mal)position models, and between dentists and non-graduate investigators were analyzed using linear mixed-effects models. Results The overall translational deviations of individual teeth on the IO scans were 76, 32, and 58 µm in the lingual, mesial, and intrusive directions, respectively, resulting in a total displacement of 114 µm. Corresponding rotational deviations were 0.58° buccal tipping, 0.04° mesial tipping, and 0.14° distorotation leading to a combined rotation of 0.78°. These deviations were the smallest for the dental arches with anterior crowding, followed by those with spacing and those with good alignment (p < 0.05). Results were independent of the operator’s level of education. Conclusions Compared to reference desktop scans, individual teeth on full-arch IO scans showed high trueness with total translational and rotational deviations < 115 µm and < 0.80°, respectively. Clinical relevance Available confocal laser IO scanners appear sufficiently accurate for diagnostic and therapeutic orthodontic applications. Results indicate that full-arch IO scanning can be delegated to non-graduate dental staff members.
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Suri, Sunjay, Suteeta Disthaporn, Bruce Ross, Bryan Tompson, Diogenes Baena, David Fisher, and Wendy Lou. "Permanent maxillary central incisor and first molar rotations in the mixed dentition in repaired complete unilateral cleft lip and palate and their relationship with absence of teeth in their vicinity." Angle Orthodontist 88, no. 5 (May 25, 2018): 567–74. http://dx.doi.org/10.2319/121117-856.1.

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ABSTRACT Objectives: To describe qualitatively and quantitatively the directions and magnitudes of rotations of permanent maxillary central incisors and first molars in the mixed dentition in repaired complete unilateral cleft lip and palate (UCLP) and study their associations with absence of teeth in their vicinity. Materials and Methods: Dental casts and orthodontic records taken prior to orthodontic preparation for alveolar bone grafting of 74 children with repaired UCLP (53 male, 21 female; aged 8.9 ± 1.0 years) were studied. Directions and magnitudes of permanent maxillary central incisor and first molar rotations were recorded. Tooth absence was confirmed from longitudinal radiographic records. Incisor and molar rotations were analyzed in relation to the absence of teeth in their vicinity. Results: Distolabial rotation of the permanent maxillary central incisor was noted in 77.14% on the cleft side, while distopalatal rotation was noted in 82.19% on the noncleft side. Incisor rotation was greater when a permanent tooth was present distal to the cleft side central incisor, in the greater segment. The permanent maxillary first molar showed mesiopalatal rotation, which was greater on the cleft side and when there was absence of one or more teeth in the buccal segment. Conclusions: Presence and absence of teeth were associated with the severity of incisor and molar rotations in UCLP. Crowding of anterior teeth in the greater segment was associated with a greater magnitude of rotation of the cleft side permanent central incisor. Absence of one or more buccal segment teeth was associated with greater magnitude of rotation of the molar.
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Wang, Bao Ming, Xue Song Mei, Zai Xin Wu, and Chi Bing Hu. "Tooth-Leap Shaping Method for Helical Gears." Applied Mechanics and Materials 217-219 (November 2012): 1769–73. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1769.

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In order to reduce cyclic variation in rotational speed of generated gears or shaper cutter induced by additional rotation during shaping, tooth-leap shaping method for helical gears was proposed. Based on fundamentals of helical gears shaping kinematics, principle of tooth-leap shaping for helical gears was introduced. Furthermore, mathematic models of tooth-leap shaping motions for helical gears are established. Finally, several examples are calculated, results show that cyclic variation in rotational speed of generated helical gear can be reduced largely by tooth-leap shaping method comparing with conventional shaping method. Consequently this method will make shaping motions of helical gears more smooth and improve the machining accuracy of helical gears.
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Kucevic, Esad, Cena Kajevic, and Mithat Eminovic. "Prevalence of tooth rotation in identical twins." Timocki medicinski glasnik 41, no. 2 (2016): 76–82. http://dx.doi.org/10.5937/tmg1602076k.

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Gromyko, P. N., S. N. Khatetovsky, and I. V. Trusov. "Influence of tooth profile on rotation error of eccentric gearing satellite." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 65, no. 4 (December 31, 2020): 445–52. http://dx.doi.org/10.29235/1561-8358-2020-65-4-445-452.

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In the article a cycloid internal engagement of gears that form an eccentric gearing, is considered. This engagement is investigated in point of insensitivity to assembly error. Only one type of assembly error – error of center distance i. e. eccentricity – is considered. It is expanded that workability of gearing with center distance error is provided on the assumption of decrease of diameter of roller that acts as central gear tooth. Roller diameter decrease and center distance error lead to breach of condition of conjugation of gears of eccentric gearing that in turn governs the output member rotation error. IThe output member and rotation transmission mechanism are not considered. Thus output member rotation error is equated to rotation error of eccentric gearing satellite. The influence of tooth profile on rotation error of eccentric gearing satellite is estimated when center distance error. On the base of matrix kinematic the methodology that takes in account the multiple-tooth contact is worked out. On basis of the developed methodology the research of influence of satellite tooth profiles formed on the base of shortened and extended epicycloids on rotation error is carried out. It is determined that in the eccentric gearing the use of satellite tooth profiles, formed on the base of extended epicycloid, makes it possible to decrease the rotation error. At that makes possible the operation of eccentric gearing in general manufacturing settings. Thus, the possibility of extending of eccentric gearing application fields to driving devices with higher requirements to overall sizes, mass, as well as cost, is come.
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Gromyko, P. N., S. N. Khatetovsky, and I. V. Trusov. "Influence of tooth profile on rotation error of eccentric gearing satellite." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 65, no. 4 (December 31, 2020): 445–52. http://dx.doi.org/10.29235/1561-8358-2020-65-4-445-452.

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In the article a cycloid internal engagement of gears that form an eccentric gearing, is considered. This engagement is investigated in point of insensitivity to assembly error. Only one type of assembly error – error of center distance i. e. eccentricity – is considered. It is expanded that workability of gearing with center distance error is provided on the assumption of decrease of diameter of roller that acts as central gear tooth. Roller diameter decrease and center distance error lead to breach of condition of conjugation of gears of eccentric gearing that in turn governs the output member rotation error. IThe output member and rotation transmission mechanism are not considered. Thus output member rotation error is equated to rotation error of eccentric gearing satellite. The influence of tooth profile on rotation error of eccentric gearing satellite is estimated when center distance error. On the base of matrix kinematic the methodology that takes in account the multiple-tooth contact is worked out. On basis of the developed methodology the research of influence of satellite tooth profiles formed on the base of shortened and extended epicycloids on rotation error is carried out. It is determined that in the eccentric gearing the use of satellite tooth profiles, formed on the base of extended epicycloid, makes it possible to decrease the rotation error. At that makes possible the operation of eccentric gearing in general manufacturing settings. Thus, the possibility of extending of eccentric gearing application fields to driving devices with higher requirements to overall sizes, mass, as well as cost, is come.
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Ishida, Yoshiki, Yukinori Kuwajima, Cliff Lee, Kaho Ogawa, John D. Da Silva, and Shigemi Ishikawa-Nagai. "Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics." Materials 13, no. 16 (August 13, 2020): 3588. http://dx.doi.org/10.3390/ma13163588.

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The goal of our study is to launch magnetic force-driven orthodontics. This continuous study investigated the influence of magnet position on tipping and bodily tooth movement, using 3D printing technology and digital analysis. Orthodontic typodont models (TMs) for space-closure were 3D printed to mimic maxillary central incisors. Nd-Fe-B magnets were placed in the middle third (Model-M), and the cervical third (Model-C), of the tooth. TMs, before and after movement, were digitally scanned and superimposed. The 3D digital coordinates (X, Y, and Z axes), and rotations (yaw, pitch, and roll) of the tooth crown and root, were calculated and compared between the two magnet position settings. Model-M showed higher rates of movement, but more rotation than Model-C (p < 0.01). The root apex of Model-M moved in the opposite direction of the crown (R = −0.29), indicating tipping movement. In contrast, the crown and root apex moved in the same direction (R = 0.56) in Model-C, indicating bodily movement. These patterns were confirmed in a typodont model of a moderate crowding case. The results validated that modifying the magnet position increased the amount of bodily tooth movement, and decreased rotation/tipping in an ex vivo setting.
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Dissertations / Theses on the topic "Tooth rotation"

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ROSSINI, GABRIELE. "FINITE ELEMENT ANALYSIS OF CLEAR ORTHODONTIC ALIGNERS' BIOMECHANICS: FROM CAD-FE FRAMEWORK DESIGN TO CLINICAL OPTIMIZATION." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2858347.

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Dogantimur, Erkan, and Daniel Johnsson. "Analysis of Accuracy for Engine and Gearbox Sensors." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388346.

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This thesis provides a standardized method to measure accuracy for engine and gearbox sensors. Accuracy is defined by ISO 5725, which states that trueness and precision need to be known to provide a metric for accuracy. However, obtaining and processing the data required for this is not straight forward. In this thesis, a method is presented that consists of two main parts: data acquisition and data analysis. The data acquisition part shows how to connect all of the equipment used and how to sample and store all the raw data from the sensors. The data analysis part shows how to process that raw data into statistical data, such as trueness, repeatability and reproducibility for the sensors. Once repeatability and reproducibility are known, the total precision can be determined. Accuracy can then be obtained by using information from trueness and precision. Besides, this thesis shows that measurement error can be separated into error caused by the sensors and error caused by the measurand. This is useful information, because it can be used to assess which type of error is the greatest, whether or not it can be compensated for, and if it is economically viable to compensate for such error.  The results are then shown, where it is possible to gain information about the sensors’ performance from various graphs. Between Hall and inductive sensors, there were no superior winner, since they both have their strengths and weaknesses. The thesis ends by making recommendations on how to compensate for some of the errors, and how to improve upon the method to make it more automatic in the future.
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Book chapters on the topic "Tooth rotation"

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Abadjiev, V., and D. Petrova. "On the Mathematic Modeling of Kinematically Related Transforming Rotations Tooth Surfaces." In European Consortium for Mathematics in Industry, 71–74. Wiesbaden: Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-663-09834-8_8.

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Nenadic, Nenad G., Joseph A. Wodenscheck, Michael G. Thurston, and David G. Lewicki. "Seeding Cracks Using a Fatigue Tester for Accelerated Gear Tooth Breaking." In Rotating Machinery, Structural Health Monitoring, Shock and Vibration, Volume 5, 349–57. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9428-8_29.

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Sommer, Andrew, Jim Meagher, and Xi Wu. "An Advanced Numerical Model of Gear Tooth Loading from Backlash and Profile Errors." In Rotating Machinery, Structural Health Monitoring, Shock and Vibration, Volume 5, 191–201. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9428-8_15.

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Hong, I., Z. Teaford, and A. Kahraman. "A comparison of gear tooth bending fatigue lives from single tooth bending and rotating gear tests." In International Conference on Gears 2022, 45–74. VDI Verlag, 2022. http://dx.doi.org/10.51202/9783181023891-45.

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Conference papers on the topic "Tooth rotation"

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Nakajima, Keyaki, Eiichirou Tanaka, Kazunari Okabe, Hitoshi Takebe, Kazuteru Nagamura, Kiyotaka Ikejo, Shinji Hashimura, Keiichi Muramatsu, Keiichi Watanuki, and Ryozo Nemoto. "Development of the Easy Set-Up and In Situ Automatic Gear Diagnostic System Using a Laser Beam." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47252.

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We developed a method which can diagnose damage on a gear tooth surface by using laser beam without a rotary encoder. This method is as follows: 1) The tooth bottom, the tooth tip and their two medians are detected by the differentials of the laser reflection data. 2) The gear rotation speed is calculated with these four positions, and interpolated according to the rotation fluctuation. 3) By using the calculated gear rotation speed, the measured data can be converted corresponding to the gear rotation angle. Thus we diagnose gear tooth surface damage without being influenced by rotational fluctuation. We did diagnosis experiments and we made contour maps show diagnosis accuracy. From these maps, we got the following conclusions: 1) The accuracy of damage diagnosis is the same level regardless of the presence or absence of a rotary encoder. 2) The cycle of rotational fluctuation hardly affects the accuracy. 3) Bigger fluctuation amplitude makes the range accuracy worse, however the position accuracy improves.
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Amer, W., Q. Ahsan, R. I. Grosvenor, and P. W. Prickett. "Machine tool condition monitoring system using tooth rotation energy estimation (TREE) technique." In 10th IEEE International Conference on Emerging Technologies and Factory Automation. IEEE, 2005. http://dx.doi.org/10.1109/etfa.2005.1612569.

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Cheng, Yuping, and Teik C. Lim. "Dynamics of Hypoid Gear Transmission With Non-Linear Time-Varying Mesh." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14432.

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Abstract A new generalized 14 degrees-of-freedom dynamic model with coupled translation-rotation effect is developed for simulating the nonlinear vibratory response of hypoid geared rotor systems. The model incorporates the load-dependant time-varying mesh characteristic vectors due to tooth load sharing and profile modifications, backlash non-linearity, and off line-of-action friction forces. Based on the 3-dimensional tooth contact analysis results, the quasi-static mesh characteristics that describe the translation-rotation and rotation-rotation force couplings are obtained for use in the dynamic formulation. The three-dimensional representations of the mesh vectors, normal and friction forces, and moments generated at the mesh interface are also included in the proposed study. Tooth separation and the occurrence of jump phenomenon observed in the predicted frequency response functions are analyzed.
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Matsumura, Shigeki, Haruo Houjoh, Shun-ichi Ohshima, and Hiroaki Nagoya. "Observation of Ghost Noise on Ground Gears With Vibration Measurement and Detection of Surface Undulation." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14425.

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Abstract In this research, we discuss about the peculiar vibration behavior of a helical gear pair that appears at non-integer order of the meshing frequency. It is supposed that the vibration is generated because of the undulation on tooth surfaces having different cycles of transmission error from tooth mesh cycle. But, it is difficult to detect the undulation with direct measurement of tooth shapes because its amplitude is very small and the length of measured tooth profile is relatively short for spectrum analysis. At first, characteristics of tooth surface undulation are discussed with spectra of measured gear vibration. It makes clear that there are integer order surface undulation components of gear rotation. Next, possibility of the spectrum analysis of measured tooth surface deviation is also discussed using Maximum Entropy Method.
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Ikejo, Kiyotaka, Kazuteru Nagamura, Eiichirou Tanaka, and Koji Yamamoto. "Driving Performance and Strength of Pin-Rack Gear Mechanism Using a Trochoid Tooth Profile." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34243.

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A pin-rack gear mechanism, which consists of a rack bar and a sprocket pinion, transforms a rotation motion into a liner one. The rack-bar has a series of pin train, and meshes with the sprocket pinion. In the previous study, we clarified the problem caused by using the sprocket pinion with an involute tooth profile. In this study, we adopted a trochoid tooth profile to the sprocket pinion of the pin-rack gear mechanism to obtain the higher strength. We measured the tooth root stress of the sprocket pinion with a trochoid tooth profile, the driving torque, and the horizontal force of the rack bar using a pin-rack gear mechanism testing machine. Additionally, we calculated the tooth root stress of sprocket pinion, the contact stress on the tooth surface, the flash temperature and the power loss. We considered on the driving performance and the strength of the pin-rack gear mechanism using a trochoid tooth profile by comparing the measured data with the calculated results.
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Xie, M., F. M. L. Amirouche, and M. Valco. "Dynamic Analysis of Gear Meshing Teeth Using Modified Timoshenko Beam Theory." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0057.

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Abstract An explicit dynamical formulation of the gear meshing teeth using modified Timoshenko beam theory is presented in this paper. The acting position direction and magnitude of the external force is assumed time variant. The meshing tooth is modeled as a cantilever beam where the inertia forces due to the large rotation of the tooth base, as well as the external equivalent axial force and moment are all included in the equations of motion. Computer algorithms for gear dynamics based on the theory developed is presented. In the numerical simulations, the involute for the gear tooth profile is considered.
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Chougule, Hasham H., and A. V. Mirzamoghadam. "CFD Leakage Predictions of Labyrinth Seals Having Straight and Inclined Notched Teeth With Staggered Honeycomb Land." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75455.

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Labyrinth seal designs for reduced leakage have been analyzed by three-dimensional CFD simulations. The objective is to learn the effect of seal geometry modifications on total leakage through the seal and arrive at an advanced seal setting for improved seal effectiveness through reduction in leakage. Numerical modeling of the flow field were conducted at various operating conditions. The baseline seal model for this study is a conventional straight-through rotating four-tooth labyrinth seal and static honeycomb land having symmetrical hexagonal cells. The tooth design configurations include stepped single & double notched straight and inclined teeth. Another objective is to learn the effect of staggered honeycomb land with respect to rotor/teeth rotation. The effect of teeth inclination & teeth rotation compared to stationary is also discussed. CFD results indicate improved seal effectiveness with staggered honeycomb cell land. The maximum improvement of ∼9% was observed with stepped and notched inclined teeth configuration when combined with staggered honeycomb land. The leakage reduction leading to improvement in seal effectiveness as compared to baseline configuration is largely due to higher flow resistance, higher turbulence and higher blockages by introducing vortex in leakage flow through step and cavities.
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Nikitopoulos, D. E., V. Eliades, and S. Acharya. "Heat Transfer Enhancements in Rotating Two-Pass Coolant Channels With Profiled Ribs: Part 2 — Detailed Measurements." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0226.

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Detailed heat/mass transfer distributions are presented inside a two-pass rotating ribbed coolant channel for two profiled-rib configurations. Several profiled-rib configurations have been studied (Acharya et al.; 2000), and it was found that the best performance was achieved by saw-tooth ribs, and a pyramid–valley rib combination. The profiled ribs were placed directly opposite to each other on the leading and trailing surfaces. Smooth side walls were used in all the experiments. Heat transfer measurements were compared with straight ribs of equal blockage ratio. The measurements were made in a two-pass rotating facility using the naphthalene sublimation mass transfer technique which provides highly resolved surface distributions. The results presented are for a Reynolds number of 30,000 two Rotation numbers (0 and 0.3) and include average heat/mass transfer over the entire inter-rib-module as well as detailed heat/mass transfer contours for two profiled-rib cases. Significant enhancements of up to 25% in heat/mass transfer was obtained with the pyramid-valley, and saw-tooth shaped ribs under rotating conditions.
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Gonzalez-Perez, Ignacio, Alfonso Fuentes, Faydor L. Litvin, Kenichi Hayasaka, and Kenji Yukishima. "Application and Investigation of Modified Helical Gears With Several Types of Geometry." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34027.

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Involute helical gears with modified geometry for transformation of rotation between parallel axes are considered. Three types of topology of geometry are considered: (1) crowning of pinion tooth surface is provided only partially by application of a grinding disk; (2) double crowning of pinion tooth surface is obtained applying a grinding disk; (3) concave-convex pinion and gear tooth surfaces are provided (similar to Novikov-Wildhaber gears). Localization of bearing contact is provided for all three types of topology. Computerized TCA (Tooth Contact Analysis) is performed for all three types of topology to obtain: (i) path of contact on pinion and gear tooth surfaces; (ii) negative function of transmission errors for misaligned gear drives (that allows the contact ratio to be increased). Stress analysis is performed for the whole cycle of meshing. Finite element models of pinion and gear with several pairs of teeth are applied. A relative motion is imposed to the pinion model that allows friction between contact surfaces to be considered. Numerical examples have confirmed the advantages and disadvantages of the applied approaches for generation and design.
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Subramanian, Sivakumar, A. S. Sekhar, and B. V. S. S. S. Prasad. "Performance Analysis of a Rotating Labyrinth Seal With Radial Growth." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95708.

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A computational methodology is proposed to predict the running clearance of a six-tooth straight-through rotating labyrinth seal numerically by taking into account both the centrifugal and thermal growths. Four different angular velocities ranging from 0 to 3000 rad/s are chosen to study the influence of rotation on the leakage flow rate. The detailed leakage flow fields and the structural deformations are presented. Further, different pressure ratios in the range of 1.1 to 2.5 have been investigated for a wide range of initial clearances. The methodology is validated against the available data in the literature. It is found out that there is a significant reduction in leakage flow rate by incorporating the radial growth for a particular operating condition. However, for a given initial clearance, the rotation has negligible effect on the reduction in the leakage flow rate, except at pressure ratios lower than 1.7. Further; the rotation has more prominent effect for smaller clearance values.
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Reports on the topic "Tooth rotation"

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Haskell, E. H., R. B. Hayes, and G. H. Kenner. EPR dosimetry of whole deciduous tooth using a constant rotation goniometer and background subtraction with a dentine standard. Office of Scientific and Technical Information (OSTI), January 1996. http://dx.doi.org/10.2172/483334.

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