Analysis of power flow in a counter-rotating epicyclic gearing for electrical propulsion system

2011 ◽  
Vol 225 (12) ◽  
pp. 2973-2980
Author(s):  
W K Shi ◽  
L J Li ◽  
D T Qin ◽  
T C Lim
Keyword(s):  
Power Distribution ◽  
Power Flow ◽  
Planetary Gear ◽  
Unmanned Vehicles ◽  
Propulsion System ◽  
Gear Train ◽  
Planetary Gear Train ◽  
Differential Gear ◽  
Electrical Propulsion ◽  
Single Input

A novel compound epicyclic gearing that combines a planetary gear train with a differential gear train is designed for an electrical propulsion system of underwater unmanned vehicles. This epicyclic gearing can transform a single input into two counter-rotating outputs with equal torque amplitudes and speeds. Based on the analysis method of power flow in the differential gear train, the character of the power flow of the compound epicyclic gearing was determined. After comparing with the power distribution of input flow, the condition of this mechanism without power recirculation was investigated. Because the reactive torque of the motor stator is balanced by the torque on ring gear of planetary gear train, no net torque acts on the vessel being propelled.

EMBODIMENT DESIGN OF NOVEL 5-SPEED REAR DRIVE HUBS FOR BICYCLES

2015 ◽  
Vol 39 (3) ◽  
pp. 431-441 ◽  
Author(s):  
Yi-Chang Wu ◽  
Tze-Cheng Wu
Keyword(s):  
Power Flow ◽  
Degrees Of Freedom ◽  
Planetary Gear ◽  
Gear Train ◽  
Main Body ◽  
Direct Drive ◽  
Drive Gear ◽  
Planetary Gear Train ◽  
Embodiment Design ◽  
The Relationship

This paper presents embodiment design of 5-speed rear drive hubs for bicycles. A 7-link, 2-degrees of freedom (DOF) compound planetary gear train as the main body of a rear drive hub is introduced. The relationship between the number of coaxial links of a planetary gear train and the number of gear stages that a drive hub can provide with is discussed. By means of kinematic analysis, four speed ratios of the planetary gear train are derived, which represents four forward gears of the rear drive hub. By adding a direct-drive gear, five forward gears can be provided and two feasible clutching sequence tables are synthesized. Manual translational-type gear-shifting mechanisms are further designed to incorporate with the planetary gear train for appropriately controlling the gear stage. The power-flow path at each gear stage is checked to verify the feasibility of the proposed design. Finally, two novel 5-speed bicycle rear drive hubs are presented.

Novel Configurations for Hybrid Transmissions Using a Simple Planetary Gear Train

2015 ◽  
Author(s):  
Huu-Tich Ngo ◽  
Hong-Sen Yan
Keyword(s):  
Hybrid Systems ◽  
Power Flow ◽  
Planetary Gear ◽  
Gear Train ◽  
Design Approach ◽  
Synthesis Process ◽  
Design Constraints ◽  
Planetary Gear Train ◽  
Operation Modes ◽  
Parallel Hybrid

This paper presents a design approach to systematically synthesize feasible configurations for series-parallel and parallel hybrid transmissions subject to design constraints and required operation modes using a simple planetary gear train (PGT). The configuration synthesis process includes two main steps: 1) assign inputs and output powers to the PGT subject to power constraints by the power arrangement process; and 2) assign clutches and brakes to the obtained systems subject to desired operation modes by the clutch arrangement process. By applying the proposed design approach, nine clutchless and 31 clutched configurations for series-parallel and parallel hybrid systems are synthesized, respectively. For each type of the hybrid systems, we analyzed kinematic and power flow of a new configuration to demonstrate the feasibility of the synthesized systems. The design approach can be used to systematically synthesize future hybrid transmissions with different mechanisms, design constraints, and desired operation modes.

scholarly journals Configuration Synthesis of Novel Hybrid Transmission Systems Using a Combination of a Ravigneaux Gear Train and a Simple Planetary Gear Train

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2333 ◽  
Author(s):  
Thanh-Tho Ho ◽  
Sheng-Jye Hwang
Keyword(s):  
Design Methodology ◽  
Power Flow ◽  
Planetary Gear ◽  
Gear Train ◽  
Design Constraints ◽  
Planetary Gear Train ◽  
Operation Modes ◽  
Hybrid Transmission ◽  
Design Requirements ◽  
Configuration Synthesis

Thirty-two novel hybrid transmissions consisting of a Ravigneaux gear train and a single planetary gear train are synthesized using a creative design methodology based on graph-theory and the lever analogy method. The design process commences by identifying an existing transmission configuration which meets all of the design requirements. The chosen design is then used to synthesize all possible mechanism permutations which satisfy the design constraints. The feasible mechanisms which satisfy both the design requirements and the design constraints are converted into analogous levers. The levers which fail to provide the required operation modes of the hybrid transmission are eliminated and the remaining levers are assigned brakes and clutches in order to realize the final designs. The responsiveness of the new hybrid transmissions and the feasibility of the proposed design methodology are confirmed by analyzing the power flow and kinematics of one of the designs in all of the operation modes.

F-0321 A Study of Variable Speed Transmission with Combined Planetary Gear Train : Combination of 2K-H Type Differential Gear and HST

2001 ◽  
Vol III.01.1 (0) ◽  
pp. 143-144
Author(s):  
Satoshi KISHI ◽  
Masaaki NAKAZAWA ◽  
Hitoshi WADA ◽  
Shuiti SANO ◽  
Tomio HORIUCHI ◽  
...  
Keyword(s):  
Planetary Gear ◽  
Gear Train ◽  
Variable Speed ◽  
Planetary Gear Train ◽  
Differential Gear

The Analysis of No Recirculation of Closed Planetary Bevel-Type CVT

2012 ◽  
Vol 538-541 ◽  
pp. 997-1001
Author(s):  
Yun Jie Wu ◽  
Kai Chang Liu
Keyword(s):  
Partition Coefficient ◽  
Closed System ◽  
Power Flow ◽  
Necessary Conditions ◽  
Planetary Gear ◽  
Processing Method ◽  
Gear Train ◽  
Planetary Gear Train ◽  
The Relationship

Kinematic and the direction of the power flow for closed planetary bevel-type CVT are performed. The relationship between partition coefficient of power and power flow in closed system is studied by analyzing closed planetary bevel-type CVT, the expressions between power partition coefficient and the basic speed ratios are established, the necessary conditions with no recirculation of power for closed planetary bevel-type CVT are determined. Sixteen possible interconnections of parallel planetary gear train and planetary bevel-type CVT are obtained. A effective compact analysis processing method for design of closed planetary bevel-type CVT with no recirculation of power is offered.

Analytical and Test Evaluation of Planetary Gear Train Efficiency (Torque Related Losses) With Multiple Power Flow Arrangements

2003 ◽  
Author(s):  
Joseph Y. Chen ◽  
James B. Borgerson
Keyword(s):  
Power Flow ◽  
Planetary Gear ◽  
Computational Procedure ◽  
Gear Train ◽  
Test Results ◽  
Test Program ◽  
Planetary Gear Train ◽  
Power Circuit ◽  
Multiple Power ◽  
Hardware Test

A step-by-step computational procedure for estimating planetary gear train efficiency is presented. This technique is especially useful for complex gear train systems, because it does not require re-arranging the power circuit to perform efficiency calculations for different power paths. A hardware test program validating the computation is also documented. The test results correlate well with the analytical model.

Enumeration of 1-DOF Planetary Gear Train Graphs Based on Functional Constraints

2002 ◽  
Vol 124 (4) ◽  
pp. 723-732 ◽  
Author(s):  
Jose M. del Castillo
Keyword(s):  
Planetary Gear ◽  
Gear Train ◽  
Functional Constraints ◽  
Planetary Gear Train ◽  
Input Shaft ◽  
Single Output ◽  
Planetary Gear Trains ◽  
Gear Trains ◽  
Single Input ◽  
Different Levels

A procedure for the enumeration of the graphs of 1-dof planetary gear trains is presented. The planetary gear trains enumerated have a single input shaft and a single output shaft. These gear trains should satisfy certain functional constraints that avoid the existence of idle links. These constraints are derived. The enumeration of the graphs exploits the resulting particular features of the structure of planetary gear trains by proceeding gradually through different levels of that structure. The procedure includes a check for isomorphism among the resulting graphs. Finally, the graphs of the planetary gear trains having up to 9 links are presented. Those graphs containing embedded structures are identified.

scholarly journals Power Flow Analysis on the Dual Input Transmission Mechanism of Small Wind Turbine Systems

2020 ◽  
Vol 10 (20) ◽  
pp. 7333
Author(s):  
Ah-Der Lin ◽  
Tsung-Pin Hung ◽  
Jao-Hwa Kuang ◽  
Hsiu-An Tsai
Keyword(s):  
Wind Turbine ◽  
Power Flow ◽  
Planetary Gear ◽  
Synchronous Generator ◽  
Transmission Mechanism ◽  
Gear Train ◽  
Dynamic Responses ◽  
Planetary Gear Train ◽  
Dynamic Power ◽  
Wind Turbine System

A parallel planetary gear train design is proposed to construct the wind turbine system that has double inputs and one output. The proposed system is flexible for the application, which may use a combination of two rotors, as used for horizontal axis or vertical axis wind turbines. The proposed transmission mechanism merges the dual time varied input wind powers to a synchronous generator. The effect of the gear train parameters on the dynamic power flow variation is modeled and simulated for the proposed wind turbine system. Results indicate the proposed planetary gear train system is a feasible and efficient design for its application to wind turbine systems. The dynamic torque equilibrium equations between meshed gear pairs are employed to analyze the dynamic power flow. The nonlinear behavior of a synchronous generator is also included in the modeling. The dynamic responses of the dual input transmission mechanism are simulated using the 4th order Runge–Kutta method. The study also investigates the effect of system parameters used in this wind turbine system (i.e., the wind speed, the magnetic flux synchronous generator, and the inertia of flywheels) on variations in electrical power output.

Dynamic Characteristics of Double Helical Planetary Gear Train With Tooth Friction

2015 ◽  
Author(s):  
Fengxia Lu ◽  
Rupeng Zhu ◽  
Haofei Wang ◽  
Heyun Bao ◽  
Miaomiao Li
Keyword(s):  
Degrees Of Freedom ◽  
Sliding Friction ◽  
Planetary Gear ◽  
Gear Train ◽  
Variable Step Size ◽  
Step Size ◽  
Planetary Gear Train ◽  
Gear Mesh ◽  
Meshing Stiffness ◽  
Nonlinear Dynamics Model

A new nonlinear dynamics model of the double helical planetary gear train with 44 degrees of freedom is developed, and the coupling effects of the sliding friction, time-varying meshing stiffness, gear backlashes, axial stagger as well as gear mesh errors, are taken into consideration. The solution of the differential governing equation of motion is solved by variable step-size Runge-Kutta numerical integration method. The influence of tooth friction on the periodic vibration and nonlinear vibration are investigated. The results show that tooth friction makes the system motion become stable by the effects of the periodic attractor under the specific meshing frequency and leads to the frequency delay for the bifurcation behavior and jump phenomenon in the system.

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