electromagnetic regenerative shock absorbers
TRANSCRIPT
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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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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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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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Rotary-type Shock Absorbers
Transfer linear motion of suspension vibration to rotary motion to drive permanent magnetic dc generators.
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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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