Generation of electricity from speed breaker

1. Generation of Electricity
from Speed-Breakers
BY: MUHAMMAD YOUSUF
DEPARTMENT OF ELECTRICAL ENGINEERING
Mehran University
of Engineering and Technology SZAB Campus, Khairpur Mir’s

2. Current situation of Electricity
 The demand of electricity in Pakistan increases day by day
 Using renewable sources we can compensate this gap to some
extent
Current Installed Capacity (MW)
Project Demand
Gap (MW)
Year MW
23,538
2015 36,217 12,679
2020 54,359 30,821
2025 80,566 57,028
2030 113,695 90,157

3. Introduction
 A large amount of potential energy is wasted in speed breaker
through friction, every time when vehicle passes over it.
 Why don’t we just utilize this potential energy to produce electricity?
 So this will be a small step to improve the situations (power crisis)
 So Electricity can be generated by using vehicle’s weight (potential
energy) as an input of prime mover or shaft
 This Generated can be used for outdoor lighting/street light, this
way we an save the electric supply which is being consumed by
street lights.

4. Advantages
 Power generation with low cost and using non-conventional energy
sources which will help us to conserve the conventional energy
sources to meet the future demand.
 By using this method, electricity will be generated throughout the
year without depending on other factors.
 Easy for maintenance and no fuel transportation problem.
 Pollution free power generation.
 Less floor area required and no obstruction to traffic.
 No need of manpower during power generation.

5. Construction of speed breaker
 The speed breaker of vibrating
type
 When a vehicle crosses the
speed breaker, it gets pressed
 The material used for speed
breaker is steel
 The shape of speed breaker is
trapezoidal

6. Basic Principle
 Simple energy conversion from Mechanical(potential energy of
vehicle) to Electrical.
 Possible using 3 different mechanisms:
I. Crank-shaft mechanism
II. Roller mechanism
III. Rack- Pinion mechanism

7. Working
 Basically reciprocating motion of the speed-breaker is converted
into rotary motion using the rack and pinion arrangement.

9. Power calculation
 Let us consider,
 The mass of any vehicle = 300Kg (Approximately)
 Height of speed brake = 15 cm
 Weight of the Body = 300 Kg x 9.81 = 2943 N
 Distance traveled by the body = Height of the speed breaker = 15cm
 Work done = weight of the body x distance travelled by the vehicle
 Power = Work done/Second = (2943 x 0.15)/60 = 7.3575 Watts
 Output Power developed for 1 vehicle passing over the speed
 Breaker arrangement for one minute = 7.3575 watts
 Power developed for 60 minutes (1 hr) = 441.45 watts
 Power developed for 24 hours = 10.5948 KW
 This power generated by vehicles is more than sufficient to run four street lights in
the night time.

10. Recommendation/conclusion