Two-Stage Precession Type Gear: Design, Geometric and Kinematic Analysis

2017 ◽  
Author(s):  
Łukasz Macyszyn ◽  
Adam Myszkowski ◽  
Roman Staniek ◽  
Stanisław Pabiszczak
Keyword(s):  
Gear Ratio ◽  
Original Method ◽  
Two Stage ◽  
Precession Angle ◽  
Gear Design ◽  
The Face ◽  
Gear Efficiency ◽  
Rotary Speed ◽  
Gear Wheels ◽  
Neodymium Magnets

The paper presents the theoretical bases, design and the principle of operation of two-stage precession type transmission with face meshing. Description and the principle of forming the face meshing which is modified by the original method have been shown as well. Dimensional relations between particular components of the gears are established and the analysis of optimal gear ratio, depending on the number of teeth or magnets on the circumferences of meshing gear wheels is also provided in the paper. For further analysis four prototypes of mechanical precession transmission with face meshing were designed, built and investigated. Those prototypes present different sizes, reduction ratio and precession angle. Investigations, described in the paper, helped to determine the gear efficiency rate as well as the maximal torque that could be transferred for the given rotary speed. This paper presents also the conception of the design of a novel double stage precession magnetic gear with face neodymium magnets. The results of the initial studies are the background of the further research in the field of magnetic precession type transmission.

GEAR DESIGN

Engevista ◽  
2014 ◽  
Vol 16 (4) ◽  
pp. 313
Author(s):  
Florian Ion Petrescu ◽  
Relly Victoria Petrescu
Keyword(s):  
Inclination Angle ◽  
Normal Pressure ◽  
Original Method ◽  
Gear Design ◽  
Pressure Angle ◽  
Number Of Teeth ◽  
Minimum Number ◽  
Gear Efficiency ◽  
Driving Wheel ◽  
Tooth Inclination

The paper presents an original method to determine the efficiency of the gear, the forces of the gearing, the velocities and the powers. The originality of this method relies on the eliminated friction modulus. The first chapters are analyzing the influence of a few parameters concerning gear efficiency.  These parameters are:  z1   - the number of teeth for the primary wheel of gear; z2   - the number of teeth of the secondary wheel of gear; alpha0 - the normal pressure angle on the divided circle; beta - the inclination angle. With the relations presented in this paper, it can synthesize the gear’s mechanisms. Today, the gears are present everywhere, in the mechanical’s world (In vehicle’s industries, in electronics and electro-technique equipments, in energetically industries, etc.). Optimizing this mechanism (the gears mechanism), we can improve the functionality of the transmissions with gears. At the gear mechanisms an important problem is the interference of the teeth. To avoid the interference between teeth, we must know the minimum number of teeth of the driving wheel, in function of the pressure angle (normal on the pitch circle, alpha0), in function of the tooth inclination angle (beta), and in function transmission ratio (i). The last chapter presents an original method to make the geometric synthesis of the gear, having in view the minimum number of teeth of the driving wheel. The classical methods use many different relations to determine the minimum number of teeth of the driving wheel. By this paper we want to give a unitary method to determine the minimum number of teeth of the driving wheel 1, to avoid the interference between the teeth of the two wheels (of the gear).

scholarly journals PLANETARY CONTINUOUSLY ADJUSTABLE GEAR TRAIN WITH FORCE CLOSURE OF PLANET GEAR AND CENTRAL GEAR: FROM IDEA TO DESIGN

2018 ◽  
Vol 17 (3) ◽  
pp. 228-237 ◽  
Author(s):  
A. M. Dankov
Keyword(s):  
Elastic Element ◽  
Gear Ratio ◽  
Gear Transmission ◽  
Gear Train ◽  
Gear Design ◽  
Force Closure ◽  
Planet Gear ◽  
Gear Wheels ◽  
Determination Of Parameters ◽  
Central Gear

One of the reasons constraining use of a continuously adjustable gear train with compound poly-sector gear wheels in general and its most perspective version that is a planetary continuously adjustable gear train in particular is its design complexity. For example, a complex design of the mechanism for regulation of transmission gear ratio is specified by the use of involute gearing that requires a presence of backlash and bottom clearances for normal functioning and, therefore, autonomous but synchronous movement of a planet gear, as well as sectors of a central gear. In order to simplify the design of especially this mechanism for continuously adjustable gear train the paper justifies a transition to a backlash-free gearing and during this process either a planet gear or sectors of central gear are forcibly moving for regulation of the transmission ratio without losing contact with the mating element. Contact constancy of interacting elements under load is ensured by their force closure which is meant to overcome an action of gearing forces. The paper describes options for implementation of backlash-free gearing as a result of planet gear and central gear force closure, each variant is characterized by selection of active (controlled) and passive (execution of force closure) gear element. In the case of gear transmission with planet pinion coaxial tooth rims it is appropriate to implement a version with involute gearing, passive planet gear and active gear sectors of central gears. In the case of gear transmission with planet pinion opposite tooth rims the most acceptable option is with the cycloidal pin wheel gear, active planet gear and passive gear sectors of central gears. The paper proposes to carry out the force closure for teeth of gear components by means of an elastic element (a spring). A method for determination of parameters for an elastic element has been described depending on a planet gear design and the paper also shows simplification level in the gear design.

scholarly journals Application of Face-Gear Drives in Helicopter Transmissions

1994 ◽  
Vol 116 (3) ◽  
pp. 672-676 ◽  
Author(s):  
F. L. Litvin ◽  
J.-C. Wang ◽  
R. B. Bossler ◽  
Y.-J. D. Chen ◽  
G. Heath ◽  
...  
Keyword(s):  
High Speed ◽  
Experimental Studies ◽  
Gear Ratio ◽  
Light Weight ◽  
Face Gear ◽  
Gear Design ◽  
Transmission Design ◽  
Torque Transmission ◽  
The Face ◽  
Gear Drives

The use of face-gears in helicopter transmissions was explored. A light-weight, split torque transmission design utilizing face-gears was described. Face-gear design is discussed. Topics included basic design geometry, tooth generation, limiting inner and outer radii, and recommendation for the gear ratio. Face-gear experimental studies were also included and the feasibility of face-gears in high-speed, high-load applications such as helicopter transmissions was demonstrated. Torque-split tests were performed and demonstrated an accurate split of torque using the face-gear concept.

scholarly journals Improving the two-stage numerical integration in stability identification of oscillation with distributed delay

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401881990
Author(s):  
Chigbogu Godwin Ozoegwu
Keyword(s):  
Numerical Integration ◽  
Distributed Delay ◽  
Original Method ◽  
Higher Order ◽  
Trapezoidal Rule ◽  
Point Of View ◽  
Engineering Systems ◽  
Two Stage ◽  
Integration Rule ◽  
Integration Rules

The vibration of the engineering systems with distributed delay is governed by delay integro-differential equations. Two-stage numerical integration approach was recently proposed for stability identification of such oscillators. This work improves the approach by handling the distributed delay—that is, the first-stage numerical integration—with tensor-based higher order numerical integration rules. The second-stage numerical integration of the arising methods remains the trapezoidal rule as in the original method. It is shown that local discretization error is of order [Formula: see text] irrespective of the order of the numerical integration rule used to handle the distributed delay. But [Formula: see text] is less weighted when higher order numerical integration rules are used to handle the distributed delay, suggesting higher accuracy. Results from theoretical error analyses, various numerical rate of convergence analyses, and stability computations were combined to conclude that—from application point of view—it is not necessary to increase the first-stage numerical integration rule beyond the first order (trapezoidal rule) though the best results are expected at the second order (Simpson’s 1/3 rule).

scholarly journals Simulation and Experimental Investigation of a Two-Stage Magnetic Precession Gear

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1838
Author(s):  
Lukasz Macyszyn ◽  
Cezary Jedryczka ◽  
Adam Myszkowski
Keyword(s):  
Mechanical Design ◽  
Maximum Load ◽  
Mechanical Efficiency ◽  
Gear Ratio ◽  
Maximum Efficiency ◽  
The Finite Element Method ◽  
Two Stage ◽  
Fem Model ◽  
And Performance ◽  
Main Components

Gears are common and important components of many types of propulsion systems applied in mechanical engineering. The aim of this paper is to present the mechanical design and performance analysis of a novel two-stage magnetic precession gear (MPG). The main advantage of the proposed design is the ability to obtain higher transmission ratios than other currently known magnetic gear types. A detailed analysis of the performance of the MPG was carried out employing a developed numerical model of the magnetic field in the proposed gear. The MPG model is based on the finite element method (FEM) and allows determining the relations between the torque acting on the main components of the gear, load angles, and air-gap lengths. To validate the developed FEM model, the prototype of an MPG with a 1/144 gear ratio was built and tested. The experiments were also focused on determining the mechanical efficiency as well as the influence of rotational speed and lengths of air gaps on the maximum load torque. The tests indicated that the maximum efficiency of the studied MPG is about 30%, which is comparable to the efficiency of mechanical two-stage precession gears with face meshing.

IDENTIFICATION OF CONSTANTLY OPERATING MATHEMATICAL MODELS FOR QUALITY CONTROL OF UNIVERSITY STUDENTS’ KNOWLEDGE

10.12737/6079 ◽  
2014 ◽  
Vol 7 (2) ◽  
pp. 36-40
Author(s):  
Стародубцев ◽  
V. Starodubtsev ◽  
Фарафонов ◽  
A. Farafonov
Keyword(s):  
Quality Control ◽  
University Students ◽  
Mathematical Models ◽  
Original Method ◽  
Self Organization ◽  
Control Parameters ◽  
Effective Management ◽  
Knowledge Quality ◽  
The Face ◽  
And Control

Based on the theory of self-organization has developed an original method for identification of target functions students’ knowledge quality (SKQ) in the face of influencing factors uncertainty. The proposed system of external criteria for the models selection and control parameters allows to use the model for the effective management of the SKQ

Dynamic Simulation and Optimization of Two-Stage Extractive Alcoholic Fermentation Process: Design Impact on Controllability

2006 ◽  
Vol 1 (1) ◽  
Author(s):  
Jobrun Nandong ◽  
Yudi Samyudia ◽  
Moses O Tadé
Keyword(s):  
Fermentation Process ◽  
Dynamic Performance ◽  
Operating Conditions ◽  
Single Stage ◽  
Extractive Fermentation ◽  
Two Stage ◽  
Stage Design ◽  
Simulation And Optimization ◽  
The Face ◽  
Two Stage Design

In this paper, we address dynamic controllability of the two different designs of extractive fermentation process, namely one-stage and two-stage designs. The operating conditions that maximize yields and productivity for both designs are determined by optimization using the method of factorial design and response surface analysis. The results show that in terms of the achievable yield and productivity, the performance of the two-stage design is comparable to that of the single-stage, but the former design leads to a significant reduction in the fermentor size required. Furthermore, we analyze the dynamic controllability of the two designs of extractive fermentation process using a so-called control relevant metrics to examine their closed-loop dynamic performance in the face of uncertainty. This analysis reveals that the single-stage design has more favorable dynamic controllability than the two-stage design.

scholarly journals Occlusion of maxillary artery in treatment of trigeminal neuralgia

2012 ◽  
Vol 65 (7-8) ◽  
pp. 281-284 ◽  
Author(s):  
Vesna Novak ◽  
Petar Bosnjakovic ◽  
Sasa Ristic ◽  
Aleksandar Kostic ◽  
Boban Jelenkovic ◽  
...  
Keyword(s):  
Trigeminal Neuralgia ◽  
Base Material ◽  
Subjective Assessment ◽  
Original Method ◽  
Maxillary Artery ◽  
Artery Ligation ◽  
Carotid Artery Ligation ◽  
Vascular Elements ◽  
Electrophysiological Method ◽  
The Face

Introduction. This paper deals with a treating method of trigeminal neuralgia classified so far as idiopathic neuralgias and treated conservatively. The study was aimed at proving the compression of peripheral branches of n. trigeminus in those patients by vascular elements of a. maxillaris within the bone-ligament space of the scull and the face base. Material and Methods. The study sample consisted of 76 patients having trigeminal neuralgia. The compression was proved by clinical examination, by angiography and electrophysiological investigations. Endovascular occlusion of a. maxillaris is the original method and it was carried out in selected patients. Results. This method was applied in 76 patients. Embolisation was done in 71 patients by using occlusion spiral and gelfoan was used in 3 patients. Externa carotid artery ligation was done in 2 cases. Conclusion. The effect of absolute improvement has been achieved and verified by electrophysiological method and subjective assessment of the patients.

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