Power absorption dynamometers measure and absorb the power output of the engine to which they are coupled. Thediscussed examples illustrate how the presented approach can be extendedfor computing the equivalent inertia. Epicyclictrain dynamometer it consists of a simple epicyclic train of gears, i. A straingage bridge circuit is designed with a compensating resistor to minimize any effect of. The torque is produced by the useful load that the prime mover, motor. Epicyclic gear trains have been broadly applied in engineering practice. Epicyclictrain dynamometer torque and power transmitted. Simple train three or more wheels connected in series. We present here a simple, methodical procedure for determining the final gear ratio of an epicyclic gear train. Mech 314 dynamics of mechanisms april 16, 2011 planetary gear train velocities 1 planetary gears and pitch point gear velocities figure 1. Technique for examing epicyclic gear box krish gupta, ajay sharma amity university, aset, noida, india abstract this paper presents a method for analyzing epicyclic gearboxes by evaluating the speeds, torques and efficiency of the external elements in epicyclic gear mechanisms, as well as the total ratios of the gear box.
The model 78010 and model 78011 are an updated version of the smedley dynamometer. Not only the epicyclic gear trains in common uses were obtained, but some new types of epicyclic gear trains. A new method of design of epicyclic gear trains scientific. Following are the different types of gear trains, depending upon the arrangement of wheels. Pdf zusammenfugen online pdf dateien zusammenfugen. R is the angular speed of the arm, equal to the input angular speed. Technique for examing epicyclic gear box krish gupta, ajay sharma amity university, aset, noida, india abstract this paper presents a method for analyzing epicyclic gearboxes by evaluating the speeds, torques and efficiency of the external elements in epicyclic gear mechanisms, as well as the total ratios of. We show that the nested and the ravigneaux gear train derive from a unified model, which permits to obtain the formulation of ratio and efficiency. Design validation of high speed ratio epicyclic gear. One of the most important considerations for an epicyclic gear is to assure uniform load distribution among the planets. Epicyclic train dynamometer torque and power transmitted. Pdf the mechanical efficiency of epicyclic gear trains.
Ptd dynamometer system the ptd dynamometer system offers the proven reliability of power test dynamometers and accessories combined with a simplified version of our internationallyacclaimed powernet data acquisition and automated control package. These drives receive an unusually clear treatment because at dr. Specifically, this thesis will provide a simple solution technique for the general case of a twodegree of freedom 2dof planetary gear train along with new graphical design aids. Pdf dynamic analysis of epicyclic gear trains by means. Design, load analysis and optimization of compound epicyclic gear trains syed ibrahim dilawer1, md. Epicyclic gearing arrangements are comprised of four different elements thatproduce a wide range of speed ratios in a compact layout. We use the method introduced in epicyclic ratio calculation for determining the final gear ratio of an epicyclic gear train. Solid mechanics tutorial gear systems this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 3. The upper block has a long lever attached to it and carries a weight w at its outer end.
The dynamometer absorbed 4 watts 6% out of 69 watts required to drive the rice dehusker. Apr 19, 2015 hi i require to design an epicyclic gear train which has two different inputs and one output at another gear. In epicyclic gear trains, the axes of shafts on which the gears are mounted may move relative to a fixed axis. It involves the determination of the torque and the angular speed of the engines output shaft. Publishers pdf, also known as version of record includes final page, issue and volume numbers. The book is profusely illustrated and analyzes many applications. This torque measuring device is called dynamometers. To achieve this goal, the hydraulic dynamometer must be a universal dynamometer. Other articles where transmission dynamometer is discussed. Epicyclic gear train definition of epicyclic gear train by.
An epicyclic gear train consists of two gears mounted so that the center of one gear revolves around the center of the other. Image from blog of haja sherief image from hpi racing image from proquest image from sandia national labs image from piaget image from fortune, apr. Notice that the first gear ratio listed above is a reduction the output speed is slower than the input speed. The total mechanical loss is then given as the sum of losses from all gear meshes and bearings. An epicyclic train is often suitable when a large torquespeed ratio is required in a compact envelope. Kinematic and dynamic simulation of epicyclic gear trains. Modifications of the controller consisted of rewiring it to operate the lower voltage coils 30v dc each of the saj dynamometer, rather than the v initially supplied by the controller. This type of dynamometer can be classified as follows. A network theory for variable epicyclic gear trains technische.
Modifications of the controller consisted of rewiring it to operate the lower voltage coils 30v dc each of the saj dynamometer, rather than the v initially supplied by. Epicyclic gear trains are generally used for automatic transmission, overdrives, and final drives. Epicyclic train dynamometer it consists of a simple epicyclic. The last is a reduction again, but the output direction is reversed.
It is a motorized unit consisting of a sun gear mounted on input shaft. Please start with the tutorial for shaft calculation to see how to introduce geometry and supports for single shafts. Design, load analysis and optimization of compound epicyclic. Planetary gears or epicyclic gears are typically classified as simple or compound planetary gears. The first dynamometer car was probably one built in about 1838 by the father of computing charles babbage. Epicyclic gear train apparatus manufacturer supplier india. The phenomenon of selflock was discovered in the investigated epicyclic train. Design of machinery an introduction to the synthesis and. Velocity ratio of epicyclic gear train velocity ratio. A thorough understanding of the sometimes difficult material is facilitated through the use of both schematic and symbolic diagrams. It is made up of a number of elements which are interconnected to form the train. Epicyclic gear train nptel pdf merge this planetary gear train consists of a sun gear yellow, planet gears blue supported by the. Development of an epicyclic gear transmission laboratory.
Epicyclic gear train a small gear at the center called the sun, several medium sized gears called the planets and a large external gear called the ring gear. The outermost gear, the ring gear, meshes with each of the planet gears. This method is extremely procedural, which is appropriate since use of intuition is often quite futile when applied to complex gear trains. Our customers appreciate us as experienced development partners who, at the end of the process, deliver a technically and. In the first three types of gear trains, the axes of the shafts over which the gears are mounted are fixed relative to each other. Sep 02, 2017 examples of power absorption dynamometers are prony brake dynamometer, rope brake dynamometer, eddy current dynamometer, hydraulic dynamometer, etc. The tool investigated is from atlas copco st series and consists of three main parts. In his masters thesis for virginia polytechnic institute and state university, entitled epicyclic gear train solution techniques with application to tandem bicycling1, christopher corey has. Application examples planetary gears framo morat usa. Epicyclic gearing overal gear ratio calculator fx solver. The annular gear is also keyed to the driving shaft and rotates in clockwise direction.
The power absorbed is usually dissipated as heat by some means. More complex epicyclic trains may be analysed in a similar manner, but the technique is not of much assistance when the problem is one of gear train design the interested designer is referred to the bibliography. Design and construction of a frictional brake absorption dynamometer using electrical strain gauges malik m. Compound train an intermediate shaft carries two wheels connected in.
This is made possible in a 3 or more planet arrangement. The mechanical efficiency of epicyclic gear trains. Powermeasuring dynamometers may be transmission dynamometers or absorption dynamometers. A dynamometer or dyno for short, is a device for simultaneously measuring the torque and. A dyno that can measure torque and power delivered by the power train of a vehicle directly from the drive. Usually, following two types of lubrication mechanisms are commonly used for gear lubrication. Epicyclictrain dynamometertorque and power transmitted. Mullers discovery of their perfect analogy to the simple epicyclic drive trains. Power flow and efficiency analysis of epicyclic gear. The spur gear is keyed to the engine shaft and rotates in anticlockwise direction.
Epicyclictrain dynamometers questions and answers sanfoundry. He has a degree in mechanical engineering and before joining ge he had a research assignment at university college. Gear trains theory of machines engineering reference. Dynamic analysis of epicyclic gear trains by means of. On completion of this short tutorial you should be able to do the following. The planet and sun gears mesh so that their pitch circles roll without slip. It is stated that the simple planetary gear train consisting. Zoltan levai received 9 february 1968 abstract both compound and internal or external planet gears are considered as well as the paired planet gears.
When there is only 23 dec 2017 pdf presenting paper reveals the design. Walthers dynamometer car model railroader magazine. N is the gears teeth number, the sign depends on the type of gear and. The following types of transmission dynamometers are important from the subject point of view. We propose hereafter a unified model of epicyclic gear trains, based on a primitive parametric kernel, which contains all usual gear train formulations of any compound gear train. When combined with other forms of strength measurement it allows a much more precise measurement of body strength. Each element consists of the three components illustrated below. The most general motion is a combination of translation. Epicyclictrain dynamometertorque and power transmitted 3835. The hand dynamometer is used to secure an index of general body strength, also to measure right hand vs.
The annular gear is also keyed to the driving shaft and rotates in. The former utilize devices that measure torque, in terms of the elastic twist of the shaft or of a special torquemeter inserted between sections of the shaft. It will also address the use of epicyclic gear trains as a power coupling in a tandem bike. Note that a zero velocity input to the arm merely makes a conventional train out of the epicyclic train as shown in figure 932a. Design, load analysis and optimization of compound. Epicyclic gear train nptel pdf in the first three types of gear trains, the axes of the shafts over which the gears are mounted are. Theory of machines epicyclic gear trains bysheetal bansal air29ies2014. This method is extremely methodical, which is appropriate since use of intuition is quite futile with an epicyclic gear train such as the following example. Epicyclic train dynamometer it consists of a simple. Also, locking any two of the three components together will lock up the whole device at a 1. Structure and analysis of planetary gear trains prof. The pinion is free to rotate on a pin fixed to the lever arm. Compound train an intermediate shaft carries two wheels connected in series.
On this channel you can get education and knowledge for general issues and topics. The saj eddycurrent type dynamometer, shown in figure 4 is rated at 30 kw and controlled by a modified digalog dynamometer controller. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears. Epicyclic train dynamometer which measures power while it is being transmitted from driving to the driven shaft. At least, it appears so to me as i compare the model to a photo of the prototype page 49 of 19751976 burlington northern annual. Epicyclic gear train solution techniques with application to.
It was shown that the immense virtual power is the cause of the low. The ptd system contains everything required to perform repeatable engine certification. New concepts, the splitpower ratio and the virtual splitpower ratio, were introduced for the first time. Internal ringgear, three planets on spiderarm and the sun gear as semipictorial. The pinion or the intermediate gear meshes with both the spur and annular gears. Thus the conventional gear train is simply a special case of the more complex epicyclic train, in which its arm is held stationary. The method of the innovative synthesis of the epicyclic gear trains was presented. Information and translations of epicyclic train in the most comprehensive dictionary definitions resource on the web. When local production of power measuring device was required, an epicyclic gear transmission laboratory dynamometer was designed, developed and tested with prony brake on a small capacity rice dehusking machine with source of power from an electric motor. Yi zhang with susan finger stephannie behrens table of contents. Epicyclic train dynamometer which measures power while it is being transmitted from. By combining epicyclic gear trains in series, gear trains can be created with many degrees of kinematic freedom and a single degree of freedom. Dynamometers can be broadly classified into two types.
The paper illustrates the application of a systematic technique for thededuction of dynamic equations of epicyclic gear trains. The second is an overdrive the output speed is faster than the input speed. Transmission efficiency between the epicyclic dynamometer and prony brake was found to be 92% while that from electric motor to prony brake was found to be 83%. Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Gear train is any combination of gear wheels by which motion is transmitted from one shaft to another shaft. In this simple example of an epicyclic train, the only gear left to take an output. A basic example is a singlestage gear unit withthree fixedplanets and a rotating carrier know as a star epicyclic gear. Application of the element relations to a complete train is carried out as shown in the example which follows. Elec tric mo to r gt1 gt2 scre w driv er sh af t sw itc h mo t o r sha f t t em. Simple planetary gears have one sun, one ring, one carrier, and one planet set. Design and construction of a frictional brake absorption.
Usman awan, zahoor ali, nurtaj sultana, sajjad ali, ayesha maroof advisor. The use of theproposed method is particularly amenable in conjuction with proceduresfor the computerized enumeration of geared kinematic chains. Introduction measurement of brake horsepower is the most important measurements in the testing of an engine. The system must also accurately measure the output torque and angular velocity of the machine under test mut. Unified methods of analysis and synthesis of complex drives are employed throughout, suggesting that further simplifications may be possible through the use of a multivalued logic system which is. In some cases, such as the automotive differential, one input is provided the. Gear trains theory of machines engineering reference with. Design, modelling and analysis of a 3 stage epicyclic planetary reduction gear unit of a flight vehicle k akhila1 and m amarnath reddy2 corresponding author. Highlights the analytical expressions of the efficiency and branch powers of a compound epicyclic train with split power were derived.
Dieses kostenlose tool erlaubt es mehrere pdfs oder bilddateien miteinander zu einem pdfdokument zu verbinden. Epicyclic gear train solution techniques with application. O e of the prime and biggest use of a planetary gearbox is for running the armature of a wind turbine. A twostage planetary gear stage is defined using the program. The epicyclic gear train family in general has a central sun gear which meshes with and is surrounded by planet gears. Working for the great western railway of great britain, he equipped a passenger carriage to be placed between an engine and train and record data on a continuously moving roll of paper. A carrier connects the centers of the two gears and rotates to carry one gear, called the planet gear, around the other, called the sun gear. In power transmission dynamometers the power is transmitted to the load coupled to the engine after it is indicated on some scale. Calculation of a planetary gear train this tutorial shows the usage of mesys shaft calculation with shaft systems. The power is transmitted from gear b to d through the intermediate gear c which revolves freely on a pin. The planet gears are held to a cage or carrier that fixes the planets in orbit relative to each other. Epicyclictrain dynamometer an epicyclictrain dynamometer consists of a simple epicyclic train of gears, i. Dynamic analysis of epicyclic gear trains by means of computer algebra.
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