TESTING & DEVELOPMENT

TEST & MEASUREMENT PRODUCTS - VeDyan

The vehicle dynamics analysis toolkit, VeDyan provides rapid analysis and report generation from vehicle dynamics test data. This toolkit was initially designed to aid Roush vehicle dynamics testing services. It was developed and validated using the real world experience of the Roush Vehicle Dynamics team.

The VeDyan vehicle dynamics analysis toolkit performs as an integral part of the DRIVE™ system. This toolkit provides analysis for the standard and specialized vehicle dynamics test procedures. VeDyan will continue growing in capabilities in response to the needs of the Vehicle Dynamics test community.
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Version 1.0 Includes:
  On-Center Steering Test: The On-Center Steering test consists of a vehicle traveling at approximately 30-mph. The driver turns the steering wheel back and forth to + or -30 degrees at a frequency of .2 hertz. The report for this test will include a graph of SWT vs. Ay, SWT vs. SWA, SWA vs. Ay, Yaw vs. SWA, and driver performance. Each of the graphs will be on a separate page with relevant information on tables above them.

  Frequency Response Test: The Frequency Response test consists of a vehicle traveling at approximately 47-mph. The driver turns the steering wheel back and forth to + or -30 degrees at varying frequencies. The report for this test will include graphs of the frequency response function of Ay vs. SWA, Yaw vs. SWA, Roll vs. Ay, and SWT vs. SWA. Each graph will include the magnitude, phase, and coherence of the frequency response functions. Each graph will be located on a separate page with a table showing relevant information including –3db cutoff frequency and 90 phase lag time.

  Lane Change Test: The Lane Change test consists of a driver turning thesteering wheel 40 degrees to the left and then 30 degrees to the right while travelling at approximately 60-mph. The report for this test will include 3 graphs. One graph will have all of relevant channels plotted against time. The second graph will be the front and rear calculated roll plotted against time. The third graph will have the Ay and SWA plotted against time.
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  Parking Effort Test: The Parking Effort test consists of a vehicle traveling at approximately 5-mph. The driver turns the steering wheel back and forth 500 degrees, 4 times. The report for this test has a separate graph for each file. The graphs will have the SWT and average SWT plotted against the SWA. There is also a graph of the average of the files selected for the test.

  Power Steering Efficiency: Power Steering Efficiency can be used for any test. This procedure calculates the efficiency of the power steering system based on the power going in compared to the power going out. The report for this procedure contains 14 graphs that show the raw and calculated channels used in determining the efficiency.

  Constant Radius Test: The Constant Radius test consists of a driver accelerating from 10 to 45 mph while trying to keep the vehicle on a constant radius around a circle. The report format for this test has not been written yet. It will follow the same format as the other tests.

  Straight Line Acceleration/ Deceleration: The Straight Line Acceleration/ Deceleration test consists of a driver accelerating from 0 mph to a desired speed or decelerating from a desired speed to 0 mph. The report for this test will consist of 2 graphs comparing the vehicles vertical movement to its longitudinal acceleration.
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  Swept Steer: The Swept Steer test consists of a vehicle traveling at 60 mph with a driver turning it’s steering wheel to the right and left trying to create a lateral acceleration. Depending on whether it is a low G or high G test will determine what lateral acceleration the driver is trying to reach. The report for this test will consist of 2 graph per file, plotting the SWT and Ay vs. SWA and SWT and SWA vs. Ay. Each graph will also include a table showing the relevant information.

  Step Steer: The Step Steer test starts with a vehicle traveling at a constant speed. The driver then rapidly turns the steering wheel to a set angle. The driver holds that angle until it is steady state. This test is done repeatedly for different steering wheel angles. The report for this test will be of a similar format to the Frequency Response test report.

Future Upgrade Plans Include:

  General Viewer: The General Viewer is designed to create a report for any test that is not included in the VeDyan® software. In the General Viewer the user can create up to 4 calculated channels, and will be able to create 4 different graphs for each report.

• Interactive features with the DRIVE™ system
• Brake pedal feel
• Four-wheel drive specific maneuvers
• Snow/ice maneuvers
• Enhanced zeroing functions