Component Rotational Speed Worksheet
- Utilize the following worksheet as an aid in calculating the first, second and third order of tire/wheel assembly rotational speed and the first order of driveline (transmission output shaft/rear axle pinion gear) rotational speed related disturbances that may be present in the vehicle. See Fig 1
.
- If after completing the Tire/Wheel Rotation Worksheet, the frequencies calculated DO NOT match the dominant frequency of the disturbance recorded during testing, either recheck the data, or attempt to rematch the figures allowing for 1-5 MPH of speedometer error.
- If the possible tire/wheel assembly and/or driveline/transmission output shaft/rear axle pinion gear rotational speed related frequencies still DO NOT match the dominant frequency of the disturbance, the disturbance is most likely torque/load sensitive.
- If after completing the Tire/Wheel Rotation Worksheet, one of the frequencies calculated does match the dominant frequency of the disturbance, the disturbance is related to the rotation of that component group, tire/wheel assembly or driveline/transmission output shaft/rear axle pinion gear.
Courtesy of GENERAL MOTORS CORP.