Abstract: An ideal multi-axis transducer will respond properly to forces and moments that are applied in intermediate directions. The transducer calibration apparatus described herein can detect transducers that have incorrect off-axes response. One calibration apparatus includes a base, a pair of end stanchions fixed on the base, force actuators mounted between the base, the pair of end stanchions, and a transducer holder, the force actuators arranged to exert forces and moments on a transducer mounted in the transducer holder, and force reaction sensors fixed between the base, the pair of end stanchions, and the transducer holder for measuring forces and moments experienced by the transducer holder.

Abstract: An ideal multi-axis transducer will respond properly to forces and moments that are applied in intermediate directions. The transducer calibration apparatus described herein can detect transducers that have incorrect off-axes response. One calibration apparatus includes a base, a pair of end stanchions fixed on the base, force actuators mounted between the base, the pair of end stanchions, and a transducer holder, the force actuators arranged to exert forces and moments on a transducer mounted in the transducer holder, and force reaction sensors fixed between the base, the pair of end stanchions, and the transducer holder for measuring forces and moments experienced by the transducer holder.

Abstract: A wheel load measurement system mountable upon a wheel rim. The system includes a sensor body with an inboard ring connectable to the wheel rim, an outboard ring axially-spaced from the inboard ring and connectable to a hub adapter and a plurality of beams extending between the inboard ring and the outboard ring. A plurality of sensors, each fixed to an external surface of one of the beams, provides a signal indicating at least one of three principal forces and three principal moments experienced by the sensor body. In dual wheel mounts, an inboard and an outboard sensor body are coupled to a common hub adapter. The sensors of the inboard sensor body provide measurements for the inboard wheel, while the sensors of the outboard sensor body provide measurements for the outboard wheel.