Tire

Tire

MICHELIN Engineering & Services provides you with Michelin resources for testing, as well as specialized technicians to operate the measurements of tires.


MICHELIN Engineering & Services is experienced in dynamic analysis and operate the measurement of tire data simulation on specific machines.

Data on tires: tire model for dynamic vehicle analysis

The dynamic analysis / road handling is based on :

  • Providing data and/or coefficients for "Magic Formula" type models to simulate vehicle road handling.
  • Providing TameTire model license and coefficients for vehicle road handling in a field with a wide range of requests.

TameTire model


IPG Automotive sells TameTire, a thermomechanical simulator based on the physics of tires which is unique on the market. This innovation was developed by Michelin, based on its Motorsport researches. TameTire can be used to calculate a tire's thermal and transient state, as well as its Forces and Moments, in real time environnements.

"Magic Formula" type models

MICHELIN Engineering & Services provides you with parameter settings for the "Magic Formula" type models.

"Pacejka" type models-TNO MF-5.2

MICHELIN Engineering & Services provides you with parameter settings for the "Magic Formula 5.2" tire model. This tire model can be used to simulate vehicle handling in tools such as Adams/Car, Vedyna, IPG/CarMaker, etc. This model is advisable for transversal vehicle handling, for a wide lateral acceleration range. This model is available for passenger car, sport and truck tires, etc.

Michelin’s specific technical features

  • MICH2MF* measurement protocol, to ensure realistic data in relation to actual usage;
    *Buisson, J., "Michelin Indoor Characterization for Handling applied to Mathematical Formulae", 15. Aachener Kolloquium Fahrzeug- und Motorentechnik, 2006.
  • Measurement protocol in quality assurance using measurement control charts;
  • Measurements mainly carried out on the MTS Flat-Trac® III machine (Heavy Duty hub);
  • Fully automated post-processing of data and automatic coefficient adjustment;
  • Evaluation of the quality of all parameters in relation to measured data by means of a reliability index.

Mf5.2 use-mode 12 parameters

This set of parameters is entirely based on cornering measurements without engine/brake torque.

Michelin provides a tyre.tir file which comprises coefficients for the following variables:

  • Fy: lateral force (pure transversal);
  • Mz: self-aligning torque (pure transversal);
  • Mx: overturning torque;
  • Reff: effective rolling radius, including vertical stiffness (access to loaded radius);
  • Transient lateral parameters (apart from those that refer to the Cgyr, Mbelt gyroscopic effect).

Mf-5.2 use-mode 14 parameters

This set of parameters is based on cornering measurements (MF-5.2 use-mode 12 parameters) plus an estimation of lateral/longitudinal coupling parameters using the set of parameters of a benchmark tire measured entirely on cornering and in combined acceleration/braking.

Michelin provides a tyre.tir file which comprises coefficients for the following variables:

  • Fx: pure and coupled longitudinal force;
  • Fy: pure and coupled lateral force;
  • Mz: pure and coupled self-aligning torque;
  • My: estimated rolling resistance torque;
  • Mx: overturning torque;
  • Reff: effective rolling radius, including vertical stiffness (access to loaded radius);
  • Transient lateral and longitudinal parameters (apart from those that refer to the Cgyr, Mbelt gyroscopic effect).

Single measurements and other "Pacejka" type models

MICHELIN Engineering & Services can also provide you with measurement data allowing the adjustment of other Pacejka type models (based on the MICH2MF protocol).

Data on tires: comfort and noise

MICHELIN Engineering & Services can provide you with data for functional tire modeling, data used to adjust input parameters for NVH simulation such as RMOD-K, SWIFT-Tire, F-Tire and CD-Tire.

Offer details:

  • Advanced vehicle suspension design – comparison of solutions before the physical prototype;
  • Provision of estimated input data for functional modeling;
  • Recognized data input for models such as RMOD-K, FTire, SWIFT-Tire and CD-Tire.

Results:

  • Geometric simulation:
    • Belt mass
    • Width and average belt radius
    • Tread mass
    • Width and height of tread
    • Maximum radius and maximum wheel width
    • Ply angle
    • Tire and wheel outline
  • Static measurements:
    • Radial deflection/load curve
    • Longitudinal deflection/force curve
    • Transversal deflection/force curve
  • Handling type measurements:
    • Lateral force according to slip angle
    • Self-aligning torque according to slip angle
    • Longitudinal force according to longitudinal slip ratio
  • Comfort type simulation:
    • Cleat test: Fz and Fx forces at the centre of the wheel according to time
    • Axi-symmetric modal analysis: natural frequencies and modal damping of inflated tire, without load

MICHELIN Engineering & Services can provide you with modal sub-structured tire model, multi-body simulation models (Adams, NASTRAN, etc…).

Offer details:

  • The sub-structuring method allows dynamic tire behavior to be reproduced through reduced models.
  • The modal model describes the tire in condensed form as a series of springs linking the center of the wheel to the tire contact patch enhanced with dynamic components.
  • The tire operating point can be chosen either when stationary or when driving.

Offer details:

  • MICHELIN Engineering & Services can also provide you with a file comprising matrices for mass, stiffness and damping that can be used in a frequency range of 0 to 200Hz (without cavity, with rigid rim).

Data on tires: other measurements

MICHELIN Engineering & Services can also provide you with the characterization of wheel for analysis and modeling.

The other measurements are based on:

  • Data for Drift & Pull analyses;
  • Date for characterizing grip;
  • Measurement of uniformity (Tire/wheel assembly, tires, wheels);
  • Measurement of rolling resistance.

Data for Pull characterization

Services:

  • High precision measurements on Flat-Trac® type MTS III (Steady State) test bench
  • Third degree polynomial for each speed, pressure and load combination

Offer details:

  • High precision measurement of lateral force and self-aligning torque around small slip and camber angles in both rolling directions

Results:

  • Parameters such as force, torque and stiffness that are either measured or computed from measurements :
    • Plysteer
    • Conicity
    • Cornering force stiffness
    • Plysteer Mz torque
    • Conicity Mz torque
    • Cornering Mz torque stiffness
    • Residual plysteer
    • Residual conicity
    • Residual plysteer Mz torque
    • Residual conicity Mz torque
    • Cornering tire slip angle
    • Zero force slip angle
    • Zero Mz torque slip angle
    • slip angle rate
    • Cornering Mx torque stiffness
    • Camber Mx torque stiffness
    • Camber force stiffness
    • Camber Mz torque stiffness
    • Camber tire slip angle
    • Residual wandering torque (sensitivity of axle to camber dissymmetry)
    • Sensitivity of residual (Mz) torque
    • Plysteer Mx torque

Data for grip characterization

Services:

  • Analytical vehicle data
  • Measurement on MTS Flat-Trac® (flat tread bench)

Offer details:

  • Longitudinal grip characterization

Results:

  • Characterization µ : Fx/Fz = f°(tire slip ratio)

Measurement of uniformity (Tire/wheel assembly, tires, wheels)

Services:

  • Control of uniformity of passenger car and light truck tires on the machine

Type:

  • MONO CID LS

Results:

  • Static balancing (imbalance)
  • Radial run-out
  • Harmonic radial variation
  • Lateral and radial force variation curve
  • Conicity tendency

Measurement of rolling resistance

Measurement of rolling resistance

The aim of the test is to measure the tire's rolling resistance (C1 – passenger cars, C2 – vans, C3 – trucks) in line with ISO 28580 for R1235/2011.

Detail of the offer:

  • Measure the tire's rolling resistance in line with ISO 28580
    • Load
    • Pressure
    • Speed
    • Temperature
    • ETRTO rim
  • Warm up of the envelop before measurement
    • 30 minutes for C1 tires
    • 50 – 180 minutes for C2 and C3 tires.
  • Test report containing:
    • The various testing conditions
    • The rolling resistance coefficient in kg/T as per R1235/2011 (at 25°C and corrected for the diameter to 2 m)

Please contact MICHELIN Engineering & Services, which will provide you with Michelin resources for testing, as well as specialized technicians to feed your business needs and specific analysis.

MICHELIN Engineering & Services

Contact us by phone :

+33 4 63 21 56 94

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