Mobility

We measure critical performance aspects in mobility applications. From safety and circuit performance to input for condition-based maintenance. Please find the cases below:

  • Crash testing
  • Downforce and vibration measurement in race cars
  • Luxury yacht predictive maintenance monitoring


Crash testing

Crash tests are a crucial factor in passive safety throughout the automotive industry. They give manufacturers and OEMs in-depth knowledge about the structural and energy absorption behavior of vehicles, their components and the vehicle occupants. This project focused specifically on the integration of a measurement system to perform dynamic response analysis of a crash dummy rib deformation during impact. An optical fibre is installed on the rib, equally dividing eight optical sensors over the circumference of the rib. The interrogator is used to measure the deformation induced wavelength shifts. From this information the off-axis strain is calculated and together with the known distance to the neutral axis of the material, the bending radius is derived to reconstruct the shape of the rib. The rib deformation demonstrator is finalized by combining the design and the shape reconstruction algorithm into a dedicated visualization software capturing both real-time deformations and high-speed impacts. Full system tests substantiate the actual compression of the rib of e.g. 20 [mm] is accurately recorded by the dedicated software. The successful proof of concept is ready for ruggedization and integration into a crash test dummy for continuous real-time deformation monitoring during impact.

Downforce and vibration measurements in race cars

We validated the measurement capabilities of the PhotonFirst interrogation system for race car applications by monitoring the downforce of the rear wing of a race car. Traditionally, only FEM analysis is used to indicate the value of downforce, no actual reference measurements have been performed before to our knowledge. A single string of fiber with 8 FBGs was embedded on top of the rear wing and then shielded with laminate foil. 2 FBG sensors where embedded without adhesive with the aim for temperature monitoring. Using the shape reconstruction algorithm different vibration modes along the length dimension of the rear-wing can be visualized. Each plot is a snapshot of a 24 [msec] period, during the test sequence. With a high wind velocity, a rear wing deflection is measured and in a test bench the deflection has been related to a downforce. The measurements with FBG sensors and our standard interrogator provided data at 5 [kHz] (can go up to 19.2 [kHz]) and provided new insights in the vibration modes and downforce behaviour of the rear wing of a race car.

Luxury yacht predictive maintenance monitoring

Luxury yachts, just like daily used cargo ships, undergo tremendous hull stresses even when not in use. Looking at a yacht having a steel hull, the sunny side could become >10 [mm] longer compared to the shadow side of the ship. Monitoring ship deflections for safety guarantees and condition-based maintenance is therefore a must in the nautical industry. Safety guarantee should be realized avoiding bulky measurement systems, making the use of fibre optics an easy choice. The lightweight optical sensors in combination with the PhotonFirst interrogator with multichannel sensor recording options, allows for onboard data processing, storage and remote access to filtered data. The hull of both port and starboard side are equipped with multiple optical sensors at two decks. Therefore, not only both sides of the ship can be compared, but also different levels of the same side. Sea trials have already proven the use of the interrogation system in combination with fibre optic sensors for safety monitoring and condition-based maintenance.

Contact us to see what we can do for your industry!