Car damper energy transportation

Contents. Table of figures. Introduction. Topicality of the problem. Object of research. Aim and tasks of the work. Methodology of research. Scientific novelty of the work. Practical value of research. Literature review and analysis. Electrohydraulic regenrative shock absorbers. Electromechanical shock absorber. Electromagnetic regenerative shock absorber. Choosing my regenerative type. Parameters of experimental research. Selection of experimental method. Technological equipment. Vibration measuring device. Hardware. Vibration shaker. Oscilloscope. Analysis Software. Accelerometers. Experiment procedures. Create a dynamic model of the MR fluid shock absorber. Create mathematical model in MATLAB Simulink program. Fining optimal Simulink parameters for maximum energy generation. Design shock absorber in Solidworks using calculated theoretical parameters. Cheek construction properties with Solidworks simulation tool. Assemble real regenerative shock absorber with calculated parameters. Perform experiments of electricity generation efficiency. Expected results. Conclusions. Literature. Fig. 1. Simplified schematic view of the MMR-based energy-harvesting shock absorber. Fig. 2. The Genshock shock absorber. Fig. 3. Shock absorber‘s types. Fig. 4. Electromechanical shock absorber. Fig. 5. Electromagnetic regenerative shock absorber. Fig. 6. Portable measurement platform. Fig. 7. Vibration shaker. Fig. 8. Oscilloscope RIGOL. Fig. 9. NI Sound and Vibration measurement suite. Fig. 10 Prototypes made first, second, third.

In this Master thesis, research is to evaluate the automotive MR fluid shock absorber’s regenerative efficiency.

1.Create dynamic and mathematic model of regeneration process of shock absorber, and simulate its operation in MathLab ,,Simulink”.

2.Investigate the regenerative shock absorber to develop its parameters of maximum efficiency.

Nowadays energy harvesting systems are not fully developed and has low efficiency. Also there are different constructions for energy harvesting.

If this type of regenerative suspension systems generates high amount of power, it could be an impulse for other researchers and scientists to make more research on these type of suspensions. Also it can be started to use in every car, to lowering down fuel consumptions, and improving driving performance.

At the moment, piezoelectric crystals or smart materials are widely used in vibration energy harvesting and the electromagnetic and electrohydraulic are two main types of regenerative shock absorber for a vehicle suspension. (Yoshihiro Suda et al. 1998). There are also used electromechanical type.

Fig. 1. Simplified schematic view of the MMR-based energy-harvesting shock absorber

Most developed product on that group is GenShock, showed in figure 2, an invention of Levant Power Corp. The Levant team is made up of a group of recent MIT graduates who started work on the project while still students at Massachusets’ highest institution of learning. The GenShock is basically, a hydraulic shock absorber which has been modified to include a turbine and generator.  When the shock compresses, hydraulic fluid is sent upwards, turning a turbine that’s attached to a small power generator.  The generator produces electricity, which is then sent to whatever application the shock is powering (likely battery recharge tasks). (A. Turpen 2010)

The shock is of standard sizes to fit existing applications without modifying the vehicle except to add extra wiring for the shock’s production.  This means no engine, body, or other costly alterations are required.  Just the replacement of a big truck’s standard alternator with a smaller, lighter version that requires less pulley tension could result in fuel savings of 2-5%. (A. Turpen 2010)

Figure 3a illustrates a typical electromagnetic shock absorber. In Figure 3 (b) is showed electromechanical rack–pinion shock absorber, (fig c) ball screw mechanical shock absorber, (fig d) rotating-screw and ball screw, rotating-nut. (Tonolia et al. 2013)

Electromechanical shock absorber uses mechanical components to convert linear motion of the absorber to the rotational moment. Rotational moment is used to turn motor and generate electricity.

L. Zuo et al. developed a linear electromagnetic shock absorber, which was linear generator via rare-earth permanent magnets and high permeable magnetic loops. A 1:2 scale prototype could harvest 16–64 W power at 0.25–0.5 m/s RMS suspension velocity. (Y. Zhanga et al. 2015)

After analysis of main different types, decided to research electromagnetic type regenerative shock absorber. That type is suitable for MR fluid. MR fluid will be used to have variable damping characteristics. That type also has simple construction. So in electromagnetic MR fluid damper will be able to change damping parameters and generate electric power.

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Car damper energy transportation. (2017 m. Lapkričio 14 d.). Peržiūrėta 2018 m. Vasario 24 d. 22:19