Development of a Pavement-Embedded Piezoelectric Harvester in a Real Traffic Environment

Area of Science:

• Civil Engineering
• Materials Science
• Energy Harvesting

Background:

• Road pavements offer significant potential for energy harvesting due to their vast surface area and exposure to traffic loads.
• Existing road energy generation methods, like photovoltaics and piezoelectric transducers, have limitations in efficiency and lifespan.
• Traffic loading generates shockwaves and vibrations within pavement structures, presenting an opportunity for energy conversion.

Purpose of the Study:

• To investigate the feasibility of utilizing traffic-induced shockwaves on pavement surfaces to activate piezoelectric harvesters.
• To design and test a piezoelectric energy harvesting system integrated into road infrastructure.
• To evaluate the energy generation capacity and endurance of the proposed system under realistic traffic conditions.

Main Methods:

• Development of a piezoelectric harvester utilizing a cantilever array designed to resonate with traffic-induced vibrations.
• Embedding 16 piezoelectric sensors within four steel profiles integrated into the pavement surface.
• Measurement of peak electrical power output from individual transducers under simulated traffic loading.

Main Results:

• A peak electrical power of 55.6 µW was achieved with a single piezoelectric transducer featuring a 16 g tip mass.
• The system demonstrated potential for micro-generation of energy with minimal infrastructure changes.
• An estimated monthly generation of 50 mWh from 16 cantilevers under typical traffic (1500 vehicles/day) was calculated.

Conclusions:

• The proposed piezoelectric energy harvester shows promise for sustainable micro-power generation in road infrastructure.
• The system offers high endurance and can power low-energy devices like LED road markers.
• This technology presents a viable solution for enhancing road safety and efficiency through integrated energy harvesting.