| 摘要 |
A method for measuring low amplitude dynamic properties of a steering column includes mounting the steering column into a test fixture and performing test runs. The test runs include subjecting the input end of the steering column to input excitations and measuring output conditions, which include at least one of acceleration, velocity and position, and determining whether the output conditions are within a predetermined output range. Input excitations may include sinusoidal excitations having a selected frequency range, torque, or displacement; or dither excitations. The selected torque or displacement is determined using open loop calculations from the output conditions, to achieve target acceleration levels. Data is interpreted to determine the natural frequency or rim gain of the steering column, which are compared to predetermined permissible ranges. The maximum steering wheel rim gain permissible level may be equal to approximately 1 divided by the polar moment of inertia of the wheel.
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