During the everyday usage of an automobile, only 10–16% of the fuel energy is used to drive the car—to overcome the resistance from road friction and air drag. A conventional automotive shock absorber dampens suspension movement to produce a controlled action that keeps the tire firmly on the road. This is done by converting the kinetic energy into heat energy, which is then absorbed by the shock’s oil. This is the important loss is the dissipation of vibration energy by shock absorbers in the vehicle suspension under the excitation of road irregularity and vehicle acceleration or deceleration. In this paper we study the concepts of power generating shock absorber which can efficiently recover the vibration energy in a compact space.
Power generating shock absorber absorber is a device that converts the kinetic energy of an oscillating object into electric energy. This kinetic energy is normally dumped in a form of thermal energy in a conventional, mechanical shock absorber. It consists of a permanent magnet linear synchronous generator (PMLSG), a spring, and an electric energy accumulator. The major goal of the project is to design and analyze the operation of an electric shock absorber. It is successfully tested on electric vehicles. The system performs best on heavy, off-road vehicles moving quickly over rough terrain.
The shock absorbers are connected to a power management system that can interface with other sources of power, such as regenerative braking systems, thermoelectric devices that can convert waste heat into electricity.

Electric shock absorber is also known as Power-Generating Shock Absorber (PGSA). The Power-Generating Shock Absorber (PGSA) converts this kinetic energy into electricity instead of heat through the use of a Linear Motion Electromagnetic System (LMES).

Working of Power Generating Shock Absorbers
Fig Power Generating Shock Absorber
Fig Power Generating Shock Absorber


The Power-Generating Shock Absorber (PGSA) converts this kinetic energy into electricity instead of heat waste through the use of a Linear Motion Electromagnetic System (LMES). The LMES uses a dense permanent magnet stack embedded in the main piston, a switchable series of stator coil windings, a rectifier, and an electronic control system to manage the varying electrical output and dampening load.
The bottom shaft of the PGSA mounts to the moving suspension member and forces the magnet stack to reciprocate within the annular array of stator windings, producing alternating current electricity. That electricity is then converted into direct current through a full-wave rectifier and stored in the vehicle’s batteries. The PGSA is the same basic size and shape, and mounts in the same way, as a standard shock absorber or strut cartridge.


An electronic control system monitors the requirements of each individual road wheel’s suspension and varies the dampening by quickly switching on or off individual stator coil rings. With all stator coil rings switched on the PGSA produces a strong dampening force which can then be varied for disparate road conditions by switching coils on and off as needed. This provides an added level of benefits in allowing the shock to be very soft in cruising situations (small, high-frequency movements) and instantly change to a sport shock in aggressive cornering situations (longer, lower-frequency movements). Further, the rebound and compression strokes can have different dampening values and application curves depending on performance requirements.
This application could conceivably produce over twenty watts per wheel in normal operation. City driving, with its varying road surface characteristics, as well as stop and go traffic’s font-to-back loading, will generate more power than driving on smooth roads at consistent speeds.

  • This technology can be applied to any type of vehicle that employs movable suspension technology and uses electricity in some form as its fuel. 
  • It is successfully tested on electric vehicles. The system performs best on heavy, off-road vehicles moving quickly over rough terrain, so the company is targeting military applications.
  •  It also is sensible that having onboard power generation could be a real advantage in military situations where troops are moving in remote areas without readily available fuel sources. Conserving fuel in those scenarios, especially during combat, could be the difference between life and death.
  • What comes to mind quickly for non-military applications Is the commercial trucking industry. While they typically run trucks over roadways, their payloads of tens of thousands of pounds couple even with small, constant movements might generate a fair amount of electricity with shock absorber generators.
  •  To improve vehicle handling, the power controller uses information from accelerometers and other sensors to change the resistance from the generators, which stiffens or softens the suspension.
  • For example, if the sensors detect the car starting a turn, the power controller can increase the resistance from the shock absorbers on the outer wheels, improving cornering,
  •  A larger magnetic field will be necessary if more power needs to be generated.
  •  Conversion of energy produced by a vehicle shock absorbers movements into electrical energy, allows a significant fuel savings.
  • It is possible to obtain a fuel saving between 1.5 and 6%, depending on the vehicle and on the driving conditions. Moreover, the researchers say that this system can improve the stability of the vehicle.
  • ―Regenerative braking harvests large amount of power in a very short time, in an intermittent manner,‖ Lie Zuo said. ―However, the regenerative shock absorbers can harvest the power in a continuous way. On the smooth highway road, The electric shock absorbers can improve the fuel efficiency by 2%, and on bumpy roads up to 10% increase can be expected.‖
  • More researchers are going on to extend the tests involving other types of vehicles such as trucks, buses and other automotive vehicles.


Seminar Report  On POWER GENERATING SHOCK ABSORBEROpens in a new tab..pdf

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Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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