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Home » Products » Testing Systems » Structural Durability » Structural Durability Solutions » Biaxial Wheel Test System (ZWARP)

Biaxial Wheel Test System (ZWARP)

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    • Biaxial Wheel Test System (ZWARP)
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Challenge

Wheels are critical safety-relevant components of the vehicle which are exposed to severe loads over the lifetime. Their reliability can only be safeguarded by performing tests under laboratory conditions which resemble actual loading conditions as closely as possible. Based on an idea of the FRAUNHOFER LBF the Biaxial Wheel Test Facility was developed in the early 1980´s. This test procedure became a standard at most of the European wheel producers and was also introduced as SAE wheel standard J 2562, in 2003. Standardized load profiles like Euro-Cycle or AK-Cycle had been developed which could reduce the test time to a minimum by transforming damage content of the original design spectra of 300.000 km to an accelerated one of 10.000 km only. Today an additional method for the generation of a load profile is available. By using this so called “Hayes Lemmerz” method the ZWARP’s control parameter could be determined directly from the wheel forces without the need for the long detour of strain gauge measurement.

Solution

The Biaxial Wheel Test Facility (ZWARP) further developed by Instron includes an additional hydraulic actuator which allows a controlled and highly accurate adjustment of the tilt angle to produce high lateral forces. It is also distinguished by its compact design, high robustness and extremely high reproduction quality. In addition to standardized load sequences (Euro cycle, AK cycle, SAE J2562, etc.), the patented "Hayes Lemmerz process" is also available. This makes possible a direct determination of the control parameters of a ZWARP only from the wheel forces without strain gauge measurements which lead to a further reduction of the test time and costs.
With more than 20 installed systems and a continuous adaptation to the requirements of our customers, today's ZWARP in its 5th generation represents an optimal test system for determining the operational safety of wheels.

Accessories

  • Various test drums for optimal adjustment of wheel and drum diameters
  • Wheel adapter
  • „Hayes Lemmerz (Schwendemann) procedure" (1 test stand license)

Literature

  • Patent: WO 2001071307 A1 “Control method for a bi-axial wheel test bench for simulating driving stresses and a bi-axial wheel test bench”
  • „Hayes Lemmerz (Schwendemann) method“ (1 licence)

Controller Labtronic® 8800ml

Labtronic 8800ml, Instrons new test controller, provides an integrated laboratory solution for all requirements from component tests through to simulation of service loads on full vehicles.

Hydropuls® actuators

Hydropuls hydraulic actuators are used in the full of static and dynamic applications where high precision simulation of movement, forces, strains and accelerations are required.

Power Packs and accessories

A modular range of variable flow hydraulic power supplies are available to service dedicated test systems or to be configured as a central laboratory supply facility. Pipeline solutions are also available to safely distribute the hydraulic supply around the lab.

Sensors

A comprehensive range of fatigue rated precision transducers are available to measure position, force, torque, pressure, strain and acceleration.

Servo valves

To deliver the full range of actuator performance requirements, a range of 2 and 3 stage servo valves with flow rates from 5 liters to 2400 liters/min are available.

RSLabSite modulogic

All you need for your durability tests is the measurement data obtained from the proving ground – RS LabSite® modulogic will do the rest!

Instron Logo

“It is our objective at Instron to provide our customers the best ownership experience by delivering the highest quality products, expert support and world-class service.”


Yahya Gharagozlou
Group President, ITW Test & Measurement

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