| 摘要 |
A method of testing a steerable wheel assembly incorporating a shock absorber strut, comprising providing a combined linear and rotary actuator, engaging a lower end of the assembly with the actuator so that the line of linear action of the actuator is aligned with the line of compression of the strut, operating the actuator to compress the strut, and operating the actuator in a rotary sense to apply a steering torque to the assembly. A linear actuator is engageable with the assembly via a load coupling to load the strut. The load coupling comprising a first part on the actuator adapted to engage a second part on the assembly, the two parts being adapted to provide a self-aligning action as the actuator engages the assembly. Preferably, one of the two parts comprises a tapered recess formation, and the other two parts comprises a tapered projecting formation engageable in the tapered recess formation. The actuator is preferably controlled by feedback control loops, one incorporating a load sensor, another a torque sensor, which may be combined in a sensor cell located between the actuator and the load coupling.
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