^Title Data Acquisition in Formula SAE Suspension and Steering System Validation Tests

The ETS Formula SAE Team from the University of Quebec is renowned for its lightweight and ergonomic car design, its excellent suspension design and its scientific approach to vehicle validation and development.

The 2011 car features new suspension and steering packages designed from scratch. The new steering system was designed to reduce driver effort while allowing clear feedback from the tyres back to the driver. In order to validate set up and troubleshoot various systems on the car, loads in all suspension and steering links needed to be quantified. To do so, the team needed strain gauges on all suspension and steering links.

A race car generates a lot of electro-magnetic noise from the ignition and telemetry systems. This means that there must be minimal wiring length between the strain gauges and the amplifiers. Secondly, to provide representative data, the weight of the whole system must not alter the dynamics of the car.

The strain gauges and embedded ICA amplifiers were integrated to the data acquisition system already in place. The resulting data was used in several phases of the project. Here are a few examples:

The recorded suspension loads allowed further refinements of the chassis load case which yields a lighter yet rules compliant chassis design.

The recorded steering loads allowed the team to characterise driver effort and also allowed a new target to be set for a steering system design balancing steering response, feedback and effort.

During the validation and development phase, the strain gauges allowed the team to monitor the wheel load fluctuation for better spring-damper selection and adjustment. Also, load transfer characteristics were monitored for validation and diagnosis purposes.