? Wheel Testing at Innkeeper LLC
zwarp/biaxial WHEEL TESTING

At Innkeeper, we understand the pressures borne by the product development process and we provide prompt and efficient service to our customers. We make a concerted effort to meet your timing. Our goal is your product success.


Testing: Biaxial Wheel Durability

The Biaxial Wheel Durability test, known in Europe as ZWARP, replaces the time consuming and expensive process of validating a wheel design by using a durability vehicle on a proving ground test track. In the Biaxial Wheel Test laboratory, wheel structural durability is carried out by simulating a virtual test track without a need for a prototype vehicle. This accelerated durability wheel test reproduces the typical proving ground test in less than two weeks time as compared to many months of track time. Biaxial Wheel Testing in the laboratory allows for repeatable testing to be done prior to building an actual prototype vehicle. This allows for the optimization of design, materials and manufacturing processes very early in the product development cycle.

There are several different methods available to perform Biaxial Wheel Testing in the laboratory. Innkeeper offers all of these methods, which include:

EUROCYCLE
A standardized block program simulating a full lifetime of damage seen by a passenger vehicle wheel in 300,000 km of driving. This program is customized using the specific wheel and vehicle data to scale the program’s load amplitudes. This test uses 98 unique load pairs to define one pass of the program. This pass is repeated until 10,000 km on the specimen is reached.

AKR
The Eurocycle standardized block cycle simplified to 32 load pairs to define one pass of the program. This pass is repeated until 10,000 km on the specimen is reached.

SAE J2562
A standardized block program simulating a full lifetime of damage seen by a passenger vehicle wheel in 100,000 miles of driving. This program is customized using the specific wheel and vehicle data to scale the program’s load amplitudes.

CUSTOM LOAD FILE
A customized set of load pairs are developed using wheel forces collected on a test track with the specific wheel and vehicle. A wheel specimen is adapted with strain gages and the forces are then duplicated on a Flat Track tire testing machine where the strains are collected. Fatigue analysis is performed to remove non-damaging content and accelerate the test. These accelerated strains are replayed on the Biaxial Wheel Test machine where the strains are correlated with optimized machine load pairs.


Track to Laboratory Migration

Innkeeper can guide you through the process of moving from track testing to faster, more reliable and more affordable laboratory testing, including:

  • Road load data acquisition
  • Fatigue analysis
  • Strain gauge application
  • Custom load file development