Researchers in Germany have found an unusual new use for recycled tyre rubber. They say the material can reduce unwanted noise from power electronics in electric vehicles (EVs).
Although EVs produce less noise than vehicles with internal combustion engines, they are not silent. Occupants can still hear humming, whirring and high-pitched sounds from onboard electronics. These noises result from vibrations inside components such as power electronics and inverters.
Researchers at the Institute for Engineering of Products and Systems at Otto von Guericke University Magdeburg are focused on reducing these sounds. Instead of using conventional insulation mats, they investigated whether recycled tyre rubber could absorb vibrations more effectively.
Absorbing vibrations
The team developed a granulate made from end-of-life tyres with the particles filling cavities inside electronic components.
As the particles move, they absorb vibrations before unwanted noise in generated. According to the researchers, the solution avoids adding bulky insulation materials that increase weight and can reduce drivetrain efficiency.
Laboratory tests produced encouraging results. Noise levels fell by 6.5 decibels in the most critical frequency range. Vibrations in a component cover dropped by as much as 9.7 decibels.
However, developing the technology required more than simply filling components with recycled rubber.
‘Particles behave very differently depending on their size, material, quantity, temperature and component geometry,’ explains Braj Bhushan Prasad, research associate at the university. ‘We therefore calculate and test which particles deliver the best results in each application.’
Potential beyond power electronics
The researchers believe the technology could have wider applications throughout electric drivetrains. They see opportunities in inverters, control units and other components that generate vibrations.
Professor Hermann Rottengruber says the findings demonstrate how recycled materials can solve engineering challenges beyond traditional recycling markets.
‘Even small particles made from recycled tyre rubber can make a noticeable difference in reducing noise in electric vehicles. Our next step is to develop this into a practical design tool for future electric vehicles.’
If successful, the approach could give recycled tyre rubber another high-value application. At the same time, manufacturers may be able to reduce vehicle weight while improving passenger comfort. Consequently, the research illustrates how circular materials can contribute to both sustainability and product performance in the growing EV sector.
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