Flatplank Tyre Tester

Flatplank Tyre Tester


The Automotive Engineering Science laboratory at TU/e is equipped with a Flat Plank Tyre Tester. The tyre to be tested is mounted on the strain gauge measuring hub and loaded in upwards direction against a flat plank. This plank can translate in longitudinal direction over a length of 7 m with a fixed velocity. A maximum speed of 5 cm/s can be achieved by the road and tires with a diameter of upto 770 mm can be tested. Vertical, lateral, longitudinal, steering and camber inputs are possible. The tyre tester has five different functions that can be controlled: track movement, adjustment of the vertical axle position and load, the steering angle, the inclination angle of the track and the inclination angle of the wheel. The only elements of the car in contact with the road are the tires and they are one of the most important components affecting vehicle handling. Though quite a bit of research has been done in analyzing the behavior of tires, it is still a vehicle component which is not fully understood. Despite the work done on finite element modeling of tires, experiments are still required to better understand tyre behavior. The flat plank tyre tester is used to analyze the low speed path dependent behavior of tires. The tyre tester can be used to study tyre relaxation behavior, effective rolling radius, tyre stiffness, parking forces & moments and tyre enveloping behavior. Some of the tests that can be carried out with the tyre tester are the obstacle test, a parking test and a camber sweep test. During the obstacle test the tyre enveloping characteristics are evaluated while travelling over different obstacles for varying vertical loads. For each case the longitudinal and vertical forces are measured when passing over the obstacle. Obstacle shapes like half cylinder and trapezium are applied. The measurement data is used to validate computer simulation models. The parking test is carried out by changing the steering angle at zero forward velocity. It is used to measure the steering torque and consequently the size of the power steering system can be determined using the results of this experiment. The camber sweep test is used to evaluate the transient behavior of the tyre forces and moments for these conditions. The results are relevant for analyzing the straight line stability of a vehicle while driving over a rutted road. Overall these, and many other tests are used for the purpose of tyre model development and validation. The ultimate goal is to have an accurate description of the real tyre in a computer simulation environment. This makes it possible to analyze and improve vehicle behavior, before a hardware prototype is built.

Leave a Reply

Your email address will not be published. Required fields are marked *