Flywheel OPT

7/28/2019 Flywheel OPT

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“Optimization of a composite Flywheel”.

Author: Miguel Rodríguez Gutiérrez

MASTER ON MECHANICS OF

MATERIALS AND STRUCTURES.



INDEX

I. INTRODUCTION.

II. PROBLEM DESCRIPTION.

III. FORMULATION:

Design variables.

Objective functions.

Restrictions.

IV. RESULTS.



In a car the principal function of a car flywheel is to maintain the rotary inertia in

the car engine, avoiding engine timing troubles and cycle instabilities.

I. INTRODUCTION

Flywheel basis:

In mechanics, a flywheel is an entirely passive, that only adds additional inertia

system so that you can store kinetic energy.

This handout continues coasting when ceases torque which propels it. Thus, the

flywheel opposes sudden acceleration in a rotational movement. It is able to reduce

the angular velocity fluctuations.

That is, the flywheel is used to smooth the flow of power between a power source

and load.



At present numerous lines of research are open to finding new

applications for the flyers. Examples of such uses are:

Absorbing the energy of braking a vehicle, so that its acceleration

later reuse (KERS).

I. INTRODUCTION



II. PROBLEM DESCRIPTION.To solve this problem the methodology

employed is the topologic optimization

with the modulus of ANSYS FEM program.

Optimization of the flywheel section to

maximize its efficiency.

Sketch of the flywheel, showing the

geometrical variables:

OPVAR

OPVAR, Name, Type, MIN, MAX , TOLER

Specifies the parameters to be treated

as optimization variables.



Optimization of the energy stored by the flywheel (Ke) considering a determinedangular velocity (2000 rpm).

=

· ·

Optimization of the flywheel section to maximize its efficiency if the material density is

(Consider a maximum mass of 55 kg).

Analyze stresses to check if the design is safe.

T1000G-12K / MTM49-3

With a fiber volume of60%

II. PROBLEM DESCRIPTION.



III. FORMULATION:

Design variables.

Ro (External diameter)

W (Wide edge)

B3 (initial angle distance)

Objective functions.

=

· ·

Restrictions

MAXIMUM MASS = 55 KG

MAXIMUM STRESS < MAX. STRENGHT

Rint=Rext-W

Rr=Rint-0.2*W

Hmax=SQRT(RESF**2-Rext**2)

OPVAR

OPVAR, Name, Type, MIN, MAX , TOLER

Specifies the parameters to be treated as optimization variables.

Objective function (variable to be minimized). Only one objective

function is allowed. MIN and MAX are not used.



IV. RESULTS.



IV. RESULTS.

PROPERTIE VALOR DESCRIPCTION

Densitat

(Kg/m3) 1560

ELASTIC PRPERTIES:

E1T (GPa) 142

E1C (GPa) 108

E2T (GPa) 125 YOUNG MODULUS.

E2C (GPa)

υ12

υ13

υ23

94

0.34

0.34

0.40

POISSON COEFFICIENT

G12 (GPa) 4.3G13 (GPa) 4.3 TRANSVERSAL MODULUS

G23 (GPa) 3.6

STRENGHT PROPERTIES:

XT (MPa) 1852 LONGITUDINAL STRENGHT

Xc (MPa) 1331

YT (MPa)

Yc (MPa)

SL (MPa)

962

681

73.6

TRANSVERSAL STRENGHT

SHEAR STRENGHT



CONCLUSIONS

Composite analysis parameters.

Principal stresses fulfilled.

Apropiate Analysis for isotropic

materials as steel.



Thanks for your attention.

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Flywheel OPT