Road vehicle global performances are affected substantially by the performance of the tyres, which transmit all the tyre contact patch inputs to the rim and chassis. However, tyre behaviour is also affected by the wheel motion which is controlled by the vehicle chassis. Therefore, tyre integration on the vehicle chassis needs to be studied carefully using all the tyre characterization activities available on the vehicle.
Tyre characterization with vehicle
Applus IDIADA offers a wide range of characterization services that permit analysing subjectively and objectively the tyre’s contribution to the global vehicle performance.
Project management: Evaluation of different sets of tyres
Joint tests if required
Evaluation of vehicle performances influenced by tyre: Comfort, noise, steering, longitudinal behaviour, and response
Usage of different types of roads: Applus IDIADA Proving Ground (Spain), winter test tracks, tyre makers’ proving grounds reference race circuits, and all kinds of public road (all over the world)
Tyre objective evaluations with vehicle:
Braking tests: Stopping distance and deceleration measurements on different surfaces with different adherences: Aquaplaning, ceramic tiles, high-friction asphalt, basalt slabs, treated concrete, and gravel safety area
Aquaplaning tests while accelerating and in a curve
Dynamic tests: Objective evaluation of:
Dry dynamics tyre efficiency: Ride confort, handling, active safety, and wet dynamics tyre efficiency.
NVH tests: Interior tyre noise and vibration tests, and exterior noise tests (coast-by)
Running resistance and fuel consumption tests: Analysis of tyre contribution to whole-vehicle running resistance: Tyre wear by performing vehicle durability tests on public roads in dry condition during the whole year. Test driving programme can be generated considering client’s reference circuit.
Tyre model building
Advanced tyre parametric tyre models (such as FTire and MF-Tyre) permit Applus IDIADA chassis engineers to consider tyre performance while the vehicle is being designed without the need to be involved in tyre FEM models. Consequently, this methodology allows us the proper integration of the tyre in the chassis during the vehicle development process.
Applus IDIADA offers the service for generating two parametric tyre models which are widely used to simulate tyre performance.
MF-Tyre: Magic Formula tyre model is a “semi-empirical” tyre model which is able to predict handling performance (steady-state and transient behaviour). Therefore MF-Tyre models permit the proper integration of the tyre in the chassis during the vehicle development process when vehicle handling needs to be simulated. MF-Tyre model is generated by means of force and moment tests such as pure cornering, pure braking and combined test which are performed with IDIADA’s skid trailer (proving ground tyre test machine).
FTire:FTire is a short wavelength intermediate frequency tyre model. The construction of this parametric model is physically oriented and requires various measurement techniques and specific test equipment. Applus IDIADA has developed its own measurement procedure based on its laboratory and proving ground measurements in order to achieve precise and representative data of tyre behaviour. FTire’s main applications are:
Primary and secondary ride comfort simulations, NVH, prediction of road loads on road irregularities
Vehicle handling studies on flat or uneven roads
Prediction of complex tyre phenomena on a strictly mechanical and thermo-dynamical basis
Complex analyses at high frequency of the footprint shape, pressure distribution, tyre wear and combination of vertical, lateral, longitudinal dynamics
Applus IDIADA provides the full tyre characterization service required to generate the MF-Tyre and FTire models. The activities available are:
Measurement of the tyre contact patch
Measurement of all the wheel centre forces under a punctual input application while the tyre is rolling in proving ground condition
Measurement of the static tyre stiffness
Measurement of basic tyre properties
Measurement of tyre handling response in proving ground conditions
Tyre testing equipment:
The basic rigs used to characterize the tyres during Applus IDIADA’s modelling phase are:
Applus IDIADA’s skid trailer, which permits tyre dynamics characterization by controlling tyre attitude over the ground. All the motions and forces are being registered at the wheel centre when the wheel is free rolling or braking. Lateral slip, longitudinal slip tests, combined slip test or cleat tests are performed on a real proving ground. Apart from the generation of parametric models such as FTire and MF-Tyre, the skid trailer can be used to measure tyre adherence on dry and wet condition and to characterize specific parameters of the tyre behaviour.
Applus IDIADA’s K&C rig (Kinematics and Compliance test rig) permits tyre static stiffness characterization. Tyre attitude is controlled over the ground while all the motions and forces are being registered. The tyre contact patch is placed over a platform which can be controlled with five degrees-of-freedom (vertical, longitudinal and lateral motions; steer and roll angular movement).
Applus IDIADA’s indoor tyre laboratory tests permits the measurement of rolling resistance under defined regulations.
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