| 摘要 |
An aircraft control stick contains a load cell for measuring shear forces applied to the stick. The cell includes a flat base plate for mounting the cell in the control stick, an upper plate for receiving the forces applied to the control stick, and an intermediate plate for mounting the force-responsive elements of the cell. The intermediate plate is supported above and parallel to the base plate by a plurality of flat spring flexure members disposed in planes normal to the plane of the two plates and parallel to one another so as to permit relative motion between the two plates only in the direction at right angles to the planes of the spring flexure members. A plurality of flat cantilevered load beams are also mounted on the base plate in planes parallel to the spring flexure members. Yoke members mounted on the intermediate plate straddle the free ends of the load beams so as to contact and deflect the load beams when deflections of the spring flexure members exceed a preset threshold value. Electrical strain gauges in each cantilevered load beam provide electrical output signals representative of the deflection of the load beams. The upper flat plate is disposed in the plane parallel to and above the intermediate plate. The upper plate is mechanically coupled to the intermediate plate by a second array of spring flexure members and cantilevered load beams. |
