scholarly journals Pengembangan Program Simulasi Planetary Gear Set Dengan Kombinasi Gear Rasio

2019 ◽  
Vol 9 (2) ◽  
pp. 316
Author(s):  
Asrul Sudiar
Keyword(s):  
Planetary Gear ◽  
Gear Ratio ◽  
Study Program ◽  
Learning And Teaching ◽  
Engineering Software ◽  
Heavy Equipment ◽  
Powertrain System ◽  
Different Types ◽  
Application Engineering ◽  
Final Drive

Various components in a powertrain system can consist of a series of several components that aim to continue the engine rotation from the flywheel to the torque conventer then proceed to the transmission and then to the bevel gear to the final drive, have a variety of different types of technology and of course have advantages and each other's shortcomings. Of the various components, there are several types of components that use a device called the Planetary Gear Set, including the powershift transmission, torque divider and final drive. With the Planetary Gear Set, the rotation of the engine will be able to be doubled in torque as needed when the unit is running and with the combination produced from the Planetary Gear Set it will be possible to create various speed combinations both in the direction of the engine speed and vice versa.This research aims to create and design an application (Engineering Software) to study the workings of the Planetary Gear Set which consists of 3 basic components, namely: Ring Gear, Sun Gear and Planetary Carrier with various interactive gear ratio combinations, which will facilitate students in The Department of Mechanical Engineering in general and the Heavy Equipment Study Program especially in learning the workings of the Planetary Gear Set, so that it is expected to be a tool in the learning and teaching process.Keyword: Planetary Gear Set, Engineering Software.

Development of 2 Stage CVT Shift Control Algorithm to Reduce Torque Variation During 1-2 Upshift of Planetary Gear

2012 ◽  
Author(s):  
Jeongman Park ◽  
Sunghyun Ahn ◽  
Oheun Kwon ◽  
Youngho Jun ◽  
Minhyo Kim ◽  
...  
Keyword(s):  
Control Algorithm ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Shift Quality ◽  
Response Characteristics ◽  
Shift Control ◽  
Variable Transmission ◽  
Vehicle Simulator ◽  
Simulation Results ◽  
Fuzzy Control Algorithm

In this paper, a 2 stage continuously variable transmission (CVT) shift control algorithm is proposed for the 1–2 upshift of the planetary gear to achieve the shift quality. A fuzzy control algorithm is designed considering the relatively slower response characteristics of CVT. In order to evaluate the performance of the control algorithm, a 2 stage CVT vehicle simulator is developed including a dynamic model of the CVT powertrain. From the simulation results, it is found that CVT gear ratio changes faster in the inertia phase and remains constant after the inertia phase of the planetary gear shift, which provides the reduced torque variation by the proposed control algorithm.

Preschool Teacher Identity

2016 ◽  
pp. 1914-1942
Author(s):  
Sanja Tatalović Vorkapić ◽  
Lidija Vujičić ◽  
Renata Čepić
Keyword(s):  
Teacher Identity ◽  
Cultural Context ◽  
Preschool Teachers ◽  
Theoretical Models ◽  
Preschool Teacher ◽  
Study Program ◽  
Learning And Teaching ◽  
Education And Care ◽  
Best Teachers

The teaching process cannot be simplified to definitions of the best teachers as those possessing certain desirable teaching behaviours and skills (Katz, 2002). Although there are numerous factors that significantly influence learning and teaching, one might agree that specific teaching roles dominantly determine the quality of preschool teaching processes and learning outcomes. Furthermore, two equally important dimensions that characterize teaching roles, as linked with concepts of identity, are professional and personal dimensions. Therefore, one might be wondering: Who are contemporary preschool teachers? How do they define their self and identity? What determines identity that preschool teachers describe as theirs? Consequently, how do these identities influence the quality of process of early and preschool care and education? Answering these questions is no easy task since the concept of identity is defined in various ways in the more general literature (Beijaard, Meijer, & Verloop, 2004). This chapter is focused on an analysis of preschool teacher identity from three specific aspects. First, since all identity models emphasize the cultural context within which preschool teachers' identity develops and its crucial role, contemporary changes in preschool teacher roles and a new study program called Early and Preschool Teacher Education and Care are analysed in the Croatian context. Secondly, in order to follow contemporary literature, theoretical models of identity are presented. Afterwards, based on such models, the personality traits and temperament of research participants are analysed within the context of preschool teacher identity. Finally, the chapter's third section analyses preschool teachers' values, motives, and narratives.

Preschool Teacher Identity

2014 ◽  
pp. 22-60 ◽  
Author(s):  
Sanja Tatalović Vorkapić ◽  
Lidija Vujičić ◽  
Renata Čepić
Keyword(s):  
Teacher Identity ◽  
Cultural Context ◽  
Preschool Teachers ◽  
Theoretical Models ◽  
Preschool Teacher ◽  
Study Program ◽  
Learning And Teaching ◽  
Education And Care ◽  
Best Teachers

The teaching process cannot be simplified to definitions of the best teachers as those possessing certain desirable teaching behaviours and skills (Katz, 2002). Although there are numerous factors that significantly influence learning and teaching, one might agree that specific teaching roles dominantly determine the quality of preschool teaching processes and learning outcomes. Furthermore, two equally important dimensions that characterize teaching roles, as linked with concepts of identity, are professional and personal dimensions. Therefore, one might be wondering: Who are contemporary preschool teachers? How do they define their self and identity? What determines identity that preschool teachers describe as theirs? Consequently, how do these identities influence the quality of process of early and preschool care and education? Answering these questions is no easy task since the concept of identity is defined in various ways in the more general literature (Beijaard, Meijer, & Verloop, 2004). This chapter is focused on an analysis of preschool teacher identity from three specific aspects. First, since all identity models emphasize the cultural context within which preschool teachers' identity develops and its crucial role, contemporary changes in preschool teacher roles and a new study program called Early and Preschool Teacher Education and Care are analysed in the Croatian context. Secondly, in order to follow contemporary literature, theoretical models of identity are presented. Afterwards, based on such models, the personality traits and temperament of research participants are analysed within the context of preschool teacher identity. Finally, the chapter's third section analyses preschool teachers' values, motives, and narratives.

Effect of the bearing clearance on vibrations of a double-row planetary gear system

2019 ◽  
Vol 234 (2) ◽  
pp. 347-357
Author(s):  
Jing Liu ◽  
Shizhao Ding ◽  
Linfeng Wang ◽  
Hongwu Li ◽  
Jin Xu
Keyword(s):  
Contact Stiffness ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Gear System ◽  
Double Row ◽  
External Torque ◽  
Bearing Clearance ◽  
Gear Systems ◽  
Planetary Gear System ◽  
Stiffness And Damping

The bearing clearance, external torque, and input speed can greatly affect vibrations of the planetary gear system. The double-row planetary gear systems are commonly used in the gearbox of special vehicles, which are the key parts to obtain a larger gear ratio. Although many works have been presented to study those factors on vibrations of the single-row planetary gear system, a few works were focused on vibrations of the double-row planetary gear system with the bearing clearance. To overcome this problem, a multi-body dynamic model of a double-row planetary gear system with six planet bearings and one supported bearing of the sun gear is presented. This model is the main part of a gear box transmission system. The new model is developed for studying the effect of the bearing clearance on the planetary system. The meshing stiffness and damping between the gears are obtained by current methods in the listed references, as well as the contact stiffness and damping in bearings. The liner stiffness and damping model is used. The effects of the bearing clearance, external torque, and input speed on vibrations of the system are analyzed. The results show that vibrations of the ring gear and sun gear decrease with the increment of the external torque and increase with the increment of the input speed. Moreover, a reasonable bearing clearance can be helpful for reducing system vibrations for some mating external torque and input speed conditions. The results can provide some guidance to find new method to reduce vibrations and increase the service life of planetary gear systems.

Experiment Study on the Dynamic Characteristics of the Abrasive Flow in Centrifugal Grinding

2006 ◽  
Vol 304-305 ◽  
pp. 369-373 ◽  
Author(s):  
Hao Cheng Wang ◽  
H.T. Zhang ◽  
Q. Wang ◽  
T.W. Chen
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Planetary Gear ◽  
Scientific Basis ◽  
Gear Ratio ◽  
Design And Technology ◽  
Time Curve ◽  
Perceptual Knowledge ◽  
Profound Impact ◽  
High Efficient

Being a high efficient technique for metal surface treatment , centrifugal grinding is widely applied in the field of polishing and burring for small-sized asymmetric parts. During the process of centrifugal grinding, the dynamic characteristics of the abrasive flow, which is determined by the planetary driver ratio of the instrument, has a profound impact on the quality and producing efficiency of the workpiece. Targeting on the massive abrasive, this paper investigates experimentally theinfluence of the planetary driver ratio of the instrument to the producing quality and efficiency. On one hand, a high-speed photograph is employed to record the movement of the abrasive flow in the processing of centrifugal grinding. The dynamic characteristics of the abrasive flow have been investigated for different planetary driver ratios. By qualitative analyzing the high-speed photographing results, the perceptual knowledge of the characteristics and the kinematic rules of the abrasive flow have been obtained. On the other hand, the surface roughness data at different planetary gear ratio and polishing time have been measured. The influence of planetary gear ratio on producing process have been illustrated by plotting the roughness-time curve combined with the high-speed photograph so as to provide a scientific basis for optimizing the parameters of design and technology.

Mobility and Energy Efficiency of Military Tactical Vehicle With Hybrid-Electric Driveline System

2014 ◽  
Author(s):  
Vladimir V. Vantsevich ◽  
Jesse R. Paldan ◽  
Jeremy P. Gray
Keyword(s):  
Mathematical Model ◽  
Eddy Current ◽  
Hybrid Electric Vehicle ◽  
Operation Mode ◽  
Planetary Gear ◽  
Electrical Current ◽  
Gear Ratio ◽  
Front Axle ◽  
Tactical Vehicle ◽  
Hybrid Electric

In this paper, a technical concept is described for a power transmitting unit to control the split of power between the drive axles of a 4×4 hybrid-electric vehicle. This new power transmitting unit uses a planetary gear set and eddy current brake to provide a continuously variable gear ratio that can be integrated into the vehicle driveline between the transfer case and front axle. The paper details the electrical and mechanical characteristics of the device, including its operation mode, its mathematical model built from the equations of the planetary gear set and eddy current brake, the optimization equation by which the device will be controlled to improve vehicle slip efficiency, as well as its torque and electrical current usage. Computer simulations are performed on a mathematical model of a 4×4 military truck using the power transmitting unit in conjunction with a series hybrid-electric configuration transmission.

A New Powertrain System for Electric Hybrid Vehicles

2014 ◽  
Vol 577 ◽  
pp. 408-411
Author(s):  
Ren Guang Wang ◽  
Ming Jun Zhang ◽  
Chuan Long Shi
Keyword(s):  
Electric Vehicle ◽  
Electric Motor ◽  
Planetary Gear ◽  
Hybrid Vehicles ◽  
Regenerative Braking ◽  
Power Train ◽  
Powertrain System ◽  
Electric Driving ◽  
Left And Right ◽  
Different Parts

A new powertrain system was developed for electric vehicle driving application with adoption of one electric motor and one set of planetary gear set. With the control of fork, the sleeve of synchronizer can mesh two different parts on the left and right side; the system can provide pure electric driving, hybrid driving and regenerative braking operation modes to meet vehicle practical conditions. It can reduce both power train structure size and cost with fewer parts.

scholarly journals Modeling, Testing, and Characteristic Analysis of a Planetary Flywheel Inerter

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Zheng Ge ◽  
Weirui Wang
Keyword(s):  
Theoretical Analysis ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Ball Screw ◽  
Ring Gear ◽  
Characteristic Analysis ◽  
Planetary Gears ◽  
Nonlinear Dynamical ◽  
Output Force ◽  
New Type

We propose the planetary flywheel inerter, which is a new type of ball screw inerter. A planetary flywheel consists of several planetary gears mounted on a flywheel bracket. When the flywheel bracket is driven by a screw and rotating, each planetary gear meshing with an outer ring gear generates a compound motion composed of revolution and rotation. Theoretical analysis shows that the output force of the planetary flywheel inerter is proportional to the relative acceleration of one terminal of the inerter to the other. Optimizing the gear ratio of the planetary gears to the ring gear allows the planetary flywheel to be lighter than its traditional counterpart, without any loss on the inertance. According to the structure of the planetary flywheel inerter, nonlinear factors of the inerter are analyzed, and a nonlinear dynamical model of the inerter is established. Then the parameters in the model are identified and the accuracy of the model is validated by experiment. Theoretical analysis and experimental data show that the dynamical characteristics of a planetary flywheel inerter and those of a traditional flywheel inerter are basically the same. It is concluded that a planetary flywheel can completely replace a traditional flywheel, making the inerter lighter.

scholarly journals Analisa Kerusakan Poros Motor Final Drive dan Solusi Pemeliharaan pada Unit Excavator 220 LC

1970 ◽  
Vol 2 (04) ◽  
pp. 15-24
Author(s):  
Veny selviyanty YH
Keyword(s):  
Planetary Gear ◽  
Spline Shaft ◽  
Final Drive

Final drive adalah susunan gigi yang biasanya dalam bentuk satu set roda gigi dan lurus atau satu set gigi planet  (planetary  gear)  sebagai  drive  final  gear  yang  berfungsi  untuk  mengurangi  rotasi  dan meningkatkan torsi satuan. Prinsip kerja final drive bersama-sama dengan prinsip-prinsip transmisi, di mana ada pengurangan kecepatan rotasi dan meningkatkan torsi dengan memanfaatkan perbedaan jumlah gigi pada gigi. Pada saat operasi dan drive gigi spline gigi rusak kerusakan / permukaan (memakai / aus dan deformasi). Tujuan dari penelitian ini adalah untuk menentukan penyebab kerusakan gigi drive dan gigi spline shaft motor final drive 220 LC excavator dan untuk mencegah kerusakan serupa di masa mendatang. Dari data pengujian menyimpulkan bahwa kerusakan pada gigi drive dan gigi spline poros motor akhir perjalanan excavator 220 LC adalah memakai lelah (fatigue memakai) dan kegagalan lelah (kegagalan fatigue) yang disebabkan oleh adanya gaya tekan berulang kali (beban dinamis) dan gesekan rotary menyebabkan beban kelelahan di permukaan.

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