Torsional actuation NVH test method
First Claim
Patent Images
1. A method comprising:
- locking the output of an axle to prevent rotation;
applying a torque to an input shaft of the axle; and
monitoring energy that is transmitted to a vehicle suspension through at least one transfer path.
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Abstract
A method for evaluating energy transmission from an axle through a vehicle suspension system. The methodology employs a torsional actuator to apply input energy to the vehicle in a manner that mimics the energy that is generated by the axle during the operation of the vehicle so that both the driving load and the vibration induced by gearset motion variation are simulated. Since the energy input can be quantified and monitored, the same amount of torque can be applied during each test to permit the technician to fully comprehend differences in the designs of several axles on the transmission of noise and vibration.
40 Citations
16 Claims
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1. A method comprising:
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locking the output of an axle to prevent rotation;
applying a torque to an input shaft of the axle; and
monitoring energy that is transmitted to a vehicle suspension through at least one transfer path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14, 15)
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9. The method comprising:
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coupling a torsional actuator to an input of a power-transmitting device, the power-transmitting device having a gearset;
controlling the torsional actuator such that the torsional actuator applies a torque input to the input pinion, the torque input having a static portion and a dynamic portion, the static portion simulating power train torque and the dynamic portion simulating torsional vibration induced by gearset motion variation; and
monitoring the energy that is transmitted to a vehicle suspension through at least one transfer path. - View Dependent Claims (10, 11, 12, 13, 16)
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Specification