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Technical

Description of K&C Tests

Bounce Test Bounce-Pitch Test Roll Test Longitudinal Compliance Test /
Lateral Compliance Test Aligning Torque Test Steering Test Cornering Simulation Test Braking Simulation Test / Traction Simulation Test Combined Loading Simulation Test / Description of K&C Tests PDF

Summary of Standard K&C Tests & Reported Results
The Morse Measurements K&C test facility is the first of its kind to be independently operated and made publicly available in North America. The facility utilizes an Anthony Best Dynamics SPMM machine. The vehicle is clamped securely to the SPMM center table which can move the chassis in vertical bounce pitch and roll. The tires stay in contact with a level road plane at four individual wheel pads. These wheel pads can be free-floating – or- they can introduce ground level forces to simulate braking, tractive, and lateral loads at the tire contact patches. Precision digital encoders and load cells measure tire loads and wheel orientations at all times.

Morse Measurements’ standard K&C tests are described below. Bear in mind that this testing is flexible, and tests are customized to suite the needs of the customer. Special cases often arise and tests are designed to suite. For example, application of offset lateral loads to simulate pneumatic trail effects, or combined loading tests to better understand the full impact of compliance, etc. The following overview of standard tests provides an idea of the types of measurements that can be made on the K&C test machine. If specific vehicle measurements are required, give us a call, challenge us, and we’ll do our best to create tests that will capture the measurements that you want to see.

K&C testing at Morse Measurements is goal-driven. Each test session is tailored to meet the specific needs of the customer. The following questions should be answered in advance of each test session:

“What are the objectives of this test session?”

“What primary K&C measurements are of interest?”

Answers to these questions direct the planning of test sessions. For reference, the K&C Test Session Examples document describes some specific testing goals and scenarios, representative of what clients might typically request.

Once the objectives are known, tests are designed to make the needed measurements. There are some standard K&C tests (and variations thereof) that make up the basic building blocks of most test sessions. These tests are:

  • Bounce
  • Bounce-Pitch
  • Roll (fixed axis and/or natural axis)
  • Longitudinal Compliance, Braking
  • Longitudinal Compliance, Traction
  • Longitudinal Compliance, Single Side
  • Lateral Compliance, Parallel
  • Lateral Compliance, Opposed
  • Lateral Compliance, with Trail
  • Lateral Compliance, Single Side
  • Aligning Torque, Parallel
  • Aligning Torque, Opposed
  • Aligning Torque, Single Side
  • Steering (with and without load)

In addition, event simulation tests are available that provide additional
insight. These are categorized as:

  • Cornering Simulation
  • Braking Simulation
  • Traction Simulation
  • Combined Loading Simulation
  • Track Simulation

During each test, key suspension parameters are measured, recorded, and graphed real-time. Upon the completion of each test, real-time summary reports are generated that provide all of the key metrics from that test. These include relevant curve fits, a compiled bookmarked PDF, and a spreadsheet summarizing all of the curve fit coefficients in one place.

In addition to reports, data for all tests is provided in ASCII text and Matlab® formats. Text files which can be readily imported into Pi Toolbox® are also available. Further, a free MS ExcelTM K&C Grapher Tool is provided. This program reads in data files and allows easy curve fitting and overlays of multiple data sets.

Measurement results are presented in a clear, concise and digestible way. Rather than being “overwhelmed with data,” customers leave Morse Measurements with useful results that will help improve the vehicle!