08-12-2012, 10:35 PM
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(08-12-2012, 10:35 PM)Guest Wrote: its very helpful to us.
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thank you...and it was helpful
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thank you...and it was helpful
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It is very useful seminer topic in power generation shoch absorber
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download ppt of power generation through shock absorbers
A regenerative shock absorber is a type of shock absorber that converts parasitic intermittent linear motion and vibration into useful energy, such as electricity. Conventional shock absorbers simply dissipate this energy as heat.
When used in an electric vehicle or hybrid electric vehicle the electricity generated by the shock absorber can be diverted to its powertrain to increase battery life. In non-electric vehicles the electricity can be used to power accessories such as air conditioning. Several different systems have been developed recently, though they are still in stages of development and not installed on production vehicles.
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Power Generating Shock Absorber
ABSTRACT -An electromagnetic linear generator and regenerative electromagnetic shock absorber is disclosed which
converts variable frequency, repetitive intermittent linear displacement motion to useful electrical power. The
innovative device provides for superposition of radial components of the magnetic flux density within a coil winding
array. Due to the vector superposition of the magnetic field and magnetic flux from a plurality of magnets, a nearly
four-fold increase in magnetic flux density is achieved over conventional electromagnetic generator designs with a
potential sixteen-fold increase in power generating capacity. As a regenerative shock absorber, the disclose device is
capable of converting parasitic displacement motion and vibration encountered under normal urban driving condition to
a useful electrical energy for powering vehicles and accessories or charging batteries in electric and fossil fuel powered
vehicles. The disclosed device is capable of high power generation capacity and energy conversion efficiency with
minimal weight penalty for improved fuel efficiency.
I. INTRODUCTION
In the past decade, regenerative braking systems have become increasingly popular, recovering energy that would
otherwise be lost through braking. However, another energy recovery mechanism that is still in the research stages is
regenerative suspension systems. This technology has the ability to continuously recover a vehicle's vibrationless
energy dissipation that occurs due to road irregularities, vehicle acceleration, and braking, and use the energy to reduce
fuel consumption. Consumption; however, only 10%–16% fuel energy in the vehicles is utilized for driving to
overcome resistance from road friction and air drag . In addition to thermal efficiency and braking energy, one
important loss is kinetic energy dissipated by shock absorbers. The function of vehicle suspension system is to support
the weight of vehicle body, to isolate the vehicle chassis from road disturbances, and to enable the wheels to hold the
road surface. Two chief elements in suspension are spring and damper. Conventionally, damper is designed to dissipate
vibration energy into heat to attenuate the vibration which is transmitted from road excitation. However, the dissipated
heat is from fuel or electrical power. It is a pity that so much energy is wasted.
Green manufacturing, also called environmentally conscious manufacturing, is one of the most popular topics
nowadays. The future of green manufacturing technology is foreseeable, especially on vehicle industry. Since the
suspension is an important source of energy dissipation, it is feasible to harvest its vibration energy and convert into
regenerative energy to improve the vehicle fuel efficiency. Therefore, so called regenerative suspensions arise as the
times require. Instead of dissipating the vibration energy into heat wastes, the damper in regenerative suspension will
transform the kinetic energy into electricity or other potential energy and store it for late use. The stored energy can be
used to tune the damping force of the damper to improve the suspension performance or to power vehicle electronics to
increase vehicle fuel efficiency
II. SHOCK ABSORBER
A shock absorber is a mechanical device designed to smooth out or damp shock impulse, and convert kinetic energy to
another form of energy (usually thermal energy, which can be easily dissipated). It is a type of dashpot.
A shock absorber is a device which convert mechanical energy into thermal energy. The energy transformation occurs
as the shock absorbers fluid medium is forced through orifice at high velocity.
Description
Pneumatic and hydraulic shock absorbers are used in conjunction with cushions and springs. An automobile shock
absorber contains spring-loaded check valves and orifices to control the flow of oil through an internal piston. One
design consideration, when designing or choosing a shock absorber, is where that energy will go. In most shock
absorbers, energy is converted to heat inside the viscous fluid. In hydraulic cylinders, the hydraulic fluid heats up,
while in air cylinders, the hot air is usually exhausted to the atmosphere. In other types of shock absorbers, such
aselectromagnetic types, the dissipated energy can be stored and used later. In general terms, shock absorbers help
cushion vehicles on uneven roads.
Vehicle suspension
In a vehicle, shock absorbers reduce the effect of travelling over rough ground, leading to improved ride quality and
vehicle handling. While shock absorbers serve the purpose of limiting excessive suspension movement, their intended
sole purpose is to damp spring oscillations. Shock absorbers use valving of oil and gasses to absorb excess energy from
the springs. Spring rates are chosen by the manufacturer based on the weight of the vehicle, loaded and unloaded. Some
people use shocks to modify spring rates but this is not the correct use. Along with hysteresis in the tire itself, they
damp the energy stored in the motion of the unsprung weight up and down. Effective wheel bounce damping may
require tuning shocks to an optimal resistance. Spring-based shock absorbers commonly use coil springs or leaf springs,
though torsion bars are used in torsional shocks as well. Ideal springs alone, however, are not shock absorbers, as
springs only store and do not dissipate or absorb energy. Vehicles typically employ both hydraulic shock absorbers and
springs or torsion bars. In this combination, "shock absorber" refers specifically to the hydraulic piston that absorbs and
dissipates vibration.
reference;
http://ijirsetupload/2015/etat/24_ET144_NEW-2.pdf
