Cleveland, ohio 445 design of a flywheel module, designated the g2 module, is described. Optimization of flywheel materials using genetic algorithm pdf. Bending stress due to the torque transmitted from the rim to the shaft or from the shaft to the rim. Design of a flywheel faculty of engineering university of. Rimmed type flywheels with arms are preferred because they can store more energy. This results in usage of low power motor in punching machine. Approach while calculating the all parameter which is required for flywheel design will take from the machine design book. Pdf design and dynamic analysis of flywheel researchgate. A flywheel acts as an energy reservoir, which stores energy during. For minimum weight and high energystoring capacity, a flywheel may be made of highstrength steel and designed as a tapered disk, thick at the centre. The radial stress component in an axially symmetric and homogeneous flywheel of constant thickness exhibits a sharp peak near the inner radius. A model was developed o identify the frictional coefficient to make flywheel adaptable with superconducting bearings as kinetic energy storages with very low losses. Clutches, brakes, coupling, and flywheels clutches, brakes, couplings, and flywheels are a group of elements.
What is the difference between flywheel and solid disk. The rotating disks of uniform thickness and density is applied to each disk and the rim is not dependent on suitable condition at the junction. Jul 02, 2015 geometry of flywheel it can be a solid cylindrical disc. The angular velocity of these type of flywheels comes between 30000 rpm to 60000 rpm which may even be adjusted upto 1,00,000 rpm. Flywheel mass energy storage with hts bearing development status w. With this assumption 1 may be measured experimentally. May 12, 2019 flywheel used in an engine acts as a temporary reservoir of energy which stores the energy when energy supply is more than required and releases the stored energy when the power supply is not sufficient. They need periodic maintenance and does not use magnetic levitation bearings. Why are flywheels important and what different types are there. Type of flywheels function, applications and advantages. The mass of the flywheel is minimized subject to constraints sufficient moment of inertia and admissible stresses. The volume of the 2cm tall 6cm diameter cylinder is. Geometry of flywheel it can be a solid cylindrical disc. Their installation needs special concrete construction to support its weight.
Tensile stress due to centrifugal force acting on the rim. Flywheel 1 flywheel a flywheel is a mechanical device with a significant moment of inertia used as a storage device for rotational energy. When the flywheel rotates, centrifugal forces acts on the flywheel due to which tensile and bending stress are induced in a rim of flywheel. Design and optimization of flywheel for automobile. By using fea analysis suggested the best material for the flywheel. This paper deals with fe analysis of flywheel having 4,6 and 8 number of arms. Resembling a large, heavy disc sat between the crankshaft and the clutch system, the flywheel has a vital role to play in any engine. Assume the spokes, shaft and hub have zero moments of inertia, and the flywheels moment of inertia is from the rim alone. Flywheel used in an engine acts as a temporary reservoir of energy which stores the energy when energy supply is more than required and releases the stored energy when the power supply is not sufficient. The rotating disks of uniform thickness and density is applied to each disk and the rim is. Solid disc type flywheel is rarely used because they have less capacity of storing energy. The uneven stress distribution reveals a design that does. Student, department of mechanical engineering, rajiv gandhi college of engineering research and.
This flow chart will help to identify a subaru flywheel. Thats the wheel storing the energy you put into it and releasing it. A case study on design of a flywheel for punching press operation. Fig 21 shows numerical investigation of rim type fly wheel cast iron, which represents the maximum stress developed in the flywheel. Samshette 11 works on design solid, rim, sectioncut and six arm type flywheel maintaining constantweight. What is the main function of a flywheel in an engine. Nov 16, 2014 hence, the flywheel sizingdesign calculation for the above example shows that the required mass moment of inertia for this application should be 3. Putting this into the equation from before, we find that the radius of gyration for a flywheel is r1212, or 0. They contain magnetic levitation bearings and need less maintenance. This produces a flywheel which is as cheap and effective as can conveniently be made.
Torque and angular acceleration of a fly wheel theory. Fig 20 nodal solution of rim type flywheels glass epoxy. Calculation of the flywheel s moment of inertia can be more easily analysed by applying various simplifications. Flywheel is an inertial storage device which acts as reservoir of energy. The angular velocity of these type of flywheels comes up to 0 rpm. They are bulky and heavy if compared to high velocity fly wheels. Flywheels are used in riveting machines, where they store energy from the motor and release it during the operation cycle punching and riveting. Rimmed flywheel cfrp rim hub with cfrp reinforcement coupling structure hts bearing stator of. Wheel gravity generator free energy devices free energy.
International journal of advances in science engineering and technology, issn. International journal of advances in science engineering. Design of composite material flywheel ijste journal. The uneven stress distribution reveals a design that does not make optimal use of the material available. Design and fabrication of hybrid composite flywheel rotor. A rimtype flywheel will burst at a much lower rotary speed than a disktype wheel of the same weight and diameter. The equation for moment of inertia is different depending on the shape of the object, but for a flywheel basically a solid disk, its i12mr2, where m is the mass and r is the radius of the flywheel. Hence a rim is preferred over a disc for a flywheel. Like other types of accumulators, flywheels smooth the ripple in power output. Flywheels resist changes in their rotational speed, which helps steady the rotation of the shaft when a fluctuating torque is exerted on it by its power source such as a pistonbased reciprocating engine, or when an. Then calculate the moment of inertia of the flywheel 2 2 2 12 1 1. A flywheel is a mechanical device specifically designed to efficiently store rotational energy. Key and keyway keys are used to transmit torque from a component to the shaft. A flywheel comprising a rim 1 which is a substantially circular ring mounted on a central portion 2 which central portion comprises at least one substantially circular dished member which has a specific modulus which is less than the specific modulus of the rim, the dished member being curved such that increasing rotational speed tends to elastically deform the dished member, straightening.
There are mainly two type of flywheels available in the market. The rim is a 2cm tall 6cm diameter cylinder with a 4cm circulat hole in the middle. Depending upon the requirements of i, mass moment of inertia, a flywheel can. Figure 16 lb is a mathematical representation of a flywheel. The moment of inertia of a rim is more than that of a disc of the same mass as the mass is distributed farther away from the centre in a rim. With worked examples, exercise materials, and case studies, this unique and innovative resource develops a systematic procedure for selecting materials and processes, leading to the subset which best matches the. Lower output engines in the highspeed range may require only one such motor whereas larger engines in that range, and mediumspeed engines, need two motors with a common synchronising control.
How a flywheel works engine fly wheel flywheel explained how to install a flywheel where a fly wheel is fixed. In simple terms, the flywheels inertia accounts for its ability to conserve and dissipate energy and maintain a uniform energy distribution on the shaft. But energy requirements and size of the flywheel increases the geometry changes to disc of central hub and peripheral rim connected by webs and to hollow wheels with multiple arms. It is perfectly possible to have more than one flywheel on a single axle shaft. The g2 flywheel is a 60,000 rpm, 525 whr, 1 kw system designed for a laboratory environment. Introduction this experiment is an introduction to some basic concepts of rotational dynamics. Calculation of the flywheels moment of inertia can be more easily analysed by applying various simplifications. The inner two intrahybrid rims rims 1 and 2 were manufactured as a whole part through continuous filament winding under insitu curing conditions, and so were the outer two rims rims 3 and 4.
And simultaneously we calculate moment of inertia and kinetic energy of respective flywheel. Why are flywheels important and what different types are. The element is defined by 4 nodes with 6 dofs at each node and well suitable to create irregular meshes. The pictures below show some of the different flywheel types. Fig 17 displacement of rim type flywheel cast iron. Sectioncut and six arm type flywheel maintaining constantweight. Why is the rim type of flywheel used over the disc type of. Most electricstarting systems use motors fitted with bendixtype pinions on their armature shafts to mesh with a toothed rim on the engine flywheel. In flywheel a rimtype flywheel will burst at a much lower rotary speed than a disktype wheel of the same weight and diameter. A flywheel acts as an energy reservoir, which stores energy during the period when the supply of energy is more than the requirement and releases energy during the period when the requirement is more than the supply. The outer surface of rim 2 and the inner surface of rim 3 were cnctapered for pressfitting. Rim types with internal expanding shoes rim types with external contracting shoes band types disk or axial types cone types miscellaneous types. The phenomenon of precession has to be considered when using flywheels in moving vehicles. Depending upon the type of flywheel, design procedure we will adopt.
Its kind of like when you spin a bicycle wheel in mid air and it free wheels for a while. Jan 06, 20 clutches, brakes, coupling, and flywheels clutches, brakes, couplings, and flywheels are a group of elements usually associated with rotation that have in common the function of storing andor transferring rotating energy in analyzing the performance of these devices we shall be interested in. From there, it decreases monotonously until it reaches zero at the flywheels outer rim. The following types of stresses are induced in the rim of a flywheel. Flywheel it may be noticed that if the frictional torque, f, is constant, then the angular acceleration of the system, 1, is also constant. In this paper, based on expounding the basic structure and operating principle of the flywheel energy storage system, the maximum energy storage and energy efficiency of the flywheel batteries are. The wheel can be rotated in a vertical plane about the horizontal axle. Most electricstarting systems use motors fitted with bendix type pinions on their armature shafts to mesh with a toothed rim on the engine flywheel. Objectives after studying this unit, you should be able to explain the method of drawing turning moment diagram for a prime mover, determine the fluctuation of energy in a cycle. Raja santhosh kumar and others published design and dynamic analysis of flywheel find, read and cite all the research you need on researchgate.
Shrinkage stresses due to unequal rate of cooling of casting. Now in regard to the design of flywheel it is required to decide the mean diameter of the flywheel rim. Jansen university of toledo toledo, ohio 43606 timothy p. Fig 18 nodal solution of rim type flywheel cast iron. More the inertia, more is the capacity of the flywheel to handle fluctuations in energy of t. Find the volume of the rim of flywheel it mean radius being 5 cm its section being a square whose side is 2 cm. However in one modern application, a momentum wheel is a type of flywheel useful in satellite pointing operations, in which the flywheels are used to point the satellites instruments in the correct directions without the use of thrusters rockets. Design and optimization of flywheel for automobile applications. A case study on design of a flywheel for punching press. The flywheel provides the engine side face for the clutch to bite into, but its main job is to store kinetic energy. He conclude that six arm type flywheel store more amount of kinetic energy as compare to solid, rim and section cut flywheel. More the inertia, more is the capacity of the flywheel to handle fluctuations in energy of the shaft. Oct 22, 2007 the equation for moment of inertia is different depending on the shape of the object, but for a flywheel basically a solid disk, its i12mr2, where m is the mass and r is the radius of the flywheel.
International journal of mechanical engineering and research, issn 09734562. Aug 30, 20 if a flywheel is being used to store ke it is often designed to have a greater moment of inertia than a uniform solid disk of the same mass by making the disc with a thicker section towards the rim and a thinner section elsewhere. A rim type flywheel will burst at a much lower rotary speed than a disk type wheel of the same weight and diameter. A fairly realistic analysis of the motion of a flywheel can be made, assuming only that the net frictional torque on a. Rim type flywheel s glass epoxy, which represents the maximum stress developed in the flywheel. Latest posts by gopinath k see all worst case method assembly tolerance stack up calculation for nonsymmetric dimensional tolerances with example december 30, 2014. If a flywheel is being used to store ke it is often designed to have a greater moment of inertia than a uniform solid disk of the same mass by making the disc with a thicker section towards the rim and a thinner section elsewhere.
Design of a flywheel flywheel faculty of engineering. International journal of advances in science engineering and. The construction of the flywheels can be efficient if a central steel disc is used and two cast lead collars are attached to the rim on both sides of the web disc. The six speed 240mm flywheel can be used in vw conversions uding rjes components. What is the difference between flywheel and solid disk wheel. General design method of flywheel rotor for energy storage. Small rimmed type flywheels are manufactured with solid web or holes drilled in the web. The geometric parameters of flywheel included thickness h and inner radius r of the spoke, thickness of flywheel h, the inner radius r1 and outer radius r2 of metallic rim,the outer radius of composite rim,as shown in fig. Based on the consideration of rotational deformations in the flywheel, the element soilid72, a 3d 4node tetrahedral structural solid with rotations, is used to model meshes.
Design and optimization of a flywheel for the 4cylinder. The following stresses are induced in the arms of a flywheel. Flywheels resist changes in their rotational speed, which helps steady the rotation of the shaft when a. Assume the spokes, shaft and hub have zero moments of inertia, and the flywheel s moment of inertia is from the rim alone. The flywheel consists of a heavy circular disc or wheel with a strong axle mounted on ball bearings on two fixed supports. Planimeter area planimeter constant x number of revolutions note. The second class of flywheels uses a metallic hub and composite rim made up of. Overview 87 where e is t e energy stored by the flywheel, n a o e and n a u aare the maximum and minimum operation speed of the flywheel, and j is the moment. Honda accord 2003 find out the correct alloy wheel fitment, pcd, offset and such specs as bolt pattern, thread sizethd, center borecb for honda accord 2003. Hence, the flywheel sizingdesign calculation for the above example shows that the required mass moment of inertia for this application should be 3.