ANALYSIS OFREGENERATIVE SUSPENSION SYSTEMDEPARTMENT OF AUTOMOBILE ENGINEERING

Sri Venkateswara College Of Engineering BATCH 13Raghuviir Narendran

Rohan Shankar

A. Rukesh Babu

Project Guide: Mr. V. Ganesh

Project Review

IDEA DEVELOPMENT

Energy losses

Evolved from regenerative braking system

Conserve energy

Increase overall efficiency

PROJECT OBJECTIVES

Analyse the maximum voltage recovered due to:

Road irregularities

Braking

Vehicle hits a large bump

Determine the best conditions for energy recovery

SYSTEM CONCEPT

Recover energy from vibrations due to road bumpsand irregularities

Energy Recovery is achieved by the principle ofElectromagnetic Induction.

Wasted energy is recovered, utilized in a productiveway.

WORKING PRINCIPLE

ELECTROMAGNETIC INDUCTION

The production of electric current across a

conductor moving through a magnetic field

IN A CLOSED CIRCUIT

Change inMagnetic Flux

Induction ofElectric Current

WORKING PRINCIPLEBasic principle of Electromagnetic Induction

COMPONENTS

1. Permanent Magnet Array

2. Coil Winding Array

3. Conventional Shock absorber

Guide Cylinder

Spiral Springs

SYSTEM LAYOUT

ROAD SURFACE ANALYSIS

Road surface is assumed of c-level grade

Mean roughness value: 1-15 cm

Wavelength of the road waveform: 1-5 m

Used to determine velocity of vertical movement ofthe tyre

REGENERATED POWER

Voltage generated, V

V = Br vmax L

Maximum Current, I

I = V/R = σ Br vmax A

Power regenerated by the system, P

P = VI = σ Br2vmax

2 A L

PARAMETERS INVOLVED

Considering the motion to be harmonic vibration,

z(t) = z0 – (vmax/ω) cos ωt

Magnetic field intensity is found by a cosine

function,

B = B0 cos(πz/H)

VELOCITY OF TYRE MOVEMENT

Vertical Mean Velocity of the Tyre (vmax),

s = dZ/dX

The waveform taken for half period is,

Z = sX

The vertical mean velocity of the tyre is,

vmax = svv

INSTANTANEOUS VOLTAGE (V)

instantaneous voltage of one coil centred at z0 is

V = B0 L cos { π [z0 – (vmax/ω) cos ωt]/H} vmax sinωt

SIMULATION FOR V at z0

INSTANTANEOUS VOLTAGE

In order to account for practicality, we consider,

0° phase of the coil,

V = B0 L cos {π [(vmax/ω) cosωt]/b} vmax sinωt

90° phase

V = B0 L sin {π [(vmax/ω) cosωt]/b} vmax sinωt

SIMULATION OF 0° PHASE

GRAPH FOR 0° PHASE

SIMULATION OF VARYING VELOCITY

VARIATION OF VELOCITY

SIMULATION FOR ROAD BUMP –DISPLACEMENT

SIMULATION FOR ROAD BUMP –VOLTAGE CALCULATION

SIMULATION OF FRONT SUSPENSION

SIMULATION OF REAR SUSPENSION

TIME vs. VFOR ROAD BUMP

bump

high frequency low frequency

PROS & CONS

Reduced load on alternator

Improved overall efficiency

Extra energy can be utilized

Added weight

Complex design

THANK YOU