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ELECTOMAGNETIC REGENERATIVE

SHOCK ABSORBERS

Guide: Alex LouisAssistant Professor

Mechanical Engg Dept.

Noufal R NS7 ME BRoll No: 09Marian Engg Clg

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CONTENTS Introduction

Sources of Energy loss

Conventional Suspension Systems

Alternative ways of Regenerative Suspension

Why EM Regenerative Suspension

Electromagnetic v/s Conventional

Types

Construction

Working

Experimental setup & Result

Advantages

Disadvantages

Conclusion

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Regenerative Shock Absorbers

Usually, only 10-16% of the fuel energy is used to drive the vehicle - to overcome the road resistance and air drag.

People have been seeking ways to improve the miles per gallon (mpg) of vehicles

Regenerative shock has the ability to continuously recover a vehicle's vibration energy that is otherwise dissipated due to road irregularities, vehicle acceleration, and braking, and further use the energy for better suspension control.

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Sources of Energy Loss

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Conventional Suspension Systems

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Alternative ways of Regenerative Suspension

Piezoelectric:-

Piezo electric material is used to generate the voltage

Hydraulic:-Pressurized oil is passed through small turbine

from pipes

Electromagnetic:-Electromagnetic system is based on Faraday’s Law

of electromagnetic induction

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Why Electromagnetic..??!!!

Electromagnetic system is the best one because :-No heat generation due to frictionPossible to implement in vehicle

suspension with minimum design changes

Linear design of electromagnetic energy harvester system

Can harvest energy in both expansion and compression

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Conventional V/S Regenerative

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Different types:-

Linear-type Shock Absorbers

Rotary-type Shock Absorbers

Based on the type of construction and the way of energy generation

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Linear type Regenerative Shock Absorbers

Utilize the relative motion between magnetic field and coils to directly generate power based on Faraday’s law of electromagnetic induction.

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Construction

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Rotary-type Shock Absorbers

Transfer linear motion of suspension vibration to rotary motion to drive permanent magnetic dc generators.

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Construction

Video

General Working

Experimental Setup

Results

mechanical effciencies with different vibration frequency,

Output electrical power for different resistors at displacement inputof 0.5-Hz frequency and 30-mm vibration amplitude.

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Road Tests

• Vehicle used: Chevrolet Suburban SUV (2002 model).

• Test speed: 32kmph & 48 kmph

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Result

@ 32 km/hr

@ 48 km/hr

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Advantages

Improved Fuel Economy

Weight & Cost Savings

Continuous supply of Energy

Increased life of alternator

Better Handling and Comfort

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disadvantages

System is the costly

If system breakdowns it’s very difficult and costly affair to repair it

The system is very complex

Requires high precision machinery and skilled workers to manufacture

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Conclusion

As electromagnetic shock absorbers can be able to deliver almost continuous energy it can be used as a source of energy regenerative system

It can be installed in the vehicles with less modification in the conventional suspension systems

The amount of energy regenerated depends on the velocity of vehicle, roughness of the surfaces etc.

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REFERENCES1. Lei Zuo, Brian Scully, Jurgen Shestani and Yu Zhou, ‘Design and characterization of an electromagnetic energy harvester for vehicle suspensions’, Journal of Smart Materials and Structures, Volume 19, Number 4.

2. Gupta A, Jendrzejczyk J A, Mulcahy T M and Hull J R , ‘Design of electromagnetic shock absorbers’, International Journal of Mechanics & Material Design, Volume 3, Number 3.

3. Goldner R B, Zerigian P and Hull J R, ‘A preliminary study of energy recovery in vehicles by using regenerative magnetic shock absorbers’, SAE Paper #2001-01-2071.

4. Pei-Sheng Zhang and Lei Zuo, ’Energy harvesting, ride comfort, and road handling of regenerative vehicle suspensions’, ASME Journal of Vibration and Acoustics, 2012.

5. Zhen Longxin and Wei Xiaogang , ‘Structure and Performance Analysis of Regenerative Electromagnetic Shock Absorber’, Journal of networks, vol. 5, no. 12, December 2010

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