Device and method for measuring sectional forces

摘要

A device and a method are disclosed for measuring sectional forces on a single-piece structural element in respect of a sectional plane by strain gauges, wherein a first and a second strain gauge of the plurality of strain gauges are arranged on a first outer wall, and a third and a fourth strain gauge are arranged on a second outer wall, with the result that, when the structural element is loaded with a first force, the change in length of the first and third strain gauges is opposite to the change in length of the second and fourth strain gauges, wherein the first outer wall and the second outer wall have, in the region of a cavity, at least three openings, which are separated from each other by webs, and wherein the first, second, third and fourth strain gauges are arranged on the webs.

主权项

1. A device for measuring sectional forces on a single-piece structural element in respect of a sectional plane by a plurality of strain gauges,
wherein the structural element comprises a first and a second outer wall, which extend perpendicular to the sectional plane, extend in a mirror-symmetrical manner in relation to each other about a first mirror plane of symmetry and are connected by further outer walls, wherein the first mirror plane of symmetry extends perpendicular to the sectional plane, wherein each strain gauge has at least one associated measurement direction as well as a nominal length and electrical resistance, and the electrical resistance of the strain gauge depends on the length of the strain gauge in the measurement direction, wherein a first and a second strain gauge of the plurality of strain gauges are arranged on the first outer wall, and a third and a fourth strain gauge of the plurality of strain gauges are arranged on the second outer wall, wherein the strain gauges are arranged such that, when the structural element is loaded with a first force acting parallel to the sectional plane and parallel to the first mirror plane of symmetry, the first and third strain gauges undergo an identically oriented change in length in the measurement direction, the second and fourth strain gauges undergo an identically oriented change in length in the measurement direction, and the change in length of the first and third strain gauges is opposite to the change in length of the second and fourth strain gauges, wherein, the structural element comprises a cavity, the first outer wall comprises, in a region of the cavity, at least three openings, which are separated from each other by webs and connect the cavity to an exterior of the structural element, the second outer wall comprises, in a region of the cavity, at least three openings, which are separated from each other by webs and connect the cavity to an exterior of the structural element, and the openings and webs of the first outer wall are arranged in a mirror-symmetrical manner about the first mirror plane of symmetry in relation to the openings and webs of the second outer wall, the first, second, third and fourth strain gauges are each arranged on one of the webs, and the webs of each outer wall extend away from a common point.