Mechanical energy scavenging for in-wheel sensors : car wheel
motion and data  Car wheel motion  - go straight to data  The
performance of all in-wheel energy harvesters is reliant on the
rotation and vibration motion of the car wheel s the energy
source input. Harvester power output will vary significantly
with car speed and the road surface the wheel is travelling
over. To  aid in the modelling of the performance and to assess
the viability of the clock work energy harvester then the car
wheel dynamics of a typical small car have been measured. Wheel
rotation speed has been measured using a hall sensor and
attaching twelve metal disks to the inside of the wheel rim, fig
1a. A bracket was designed, fig 1b, to allow the hall sensor to
be attached to the shock absorber and positioned inside the
wheel rim close to the metal disks, Fig 1c. Wheel speed
measurement system  Figure 1. Wheel speed measurement system (a)
disks on wheel rim, (b) hall sensor bracket design, (c) hall
sensor mounted on shock absorber.  