Strain measuring device, strain measuring method, and ground information estimation system

摘要

PROBLEM TO BE SOLVED: To provide a strain measuring device capable of detecting axial strain and rotational strain of a rotating body, a strain measuring method, and a ground information estimation system. SOLUTION: The strain of a rotating body (shaft member 10) is measured. The strain measuring device 20 includes a main body 21 whose both ends are fixed to the rotating body (shaft member 10) along the axial direction of the rotating body (shaft member 10) and a central portion of the main body 21 in the longitudinal direction D. The central weak portion 32 having low rigidity in the main body portion 21 and the end weak portions 31 and 33 having low rigidity in the main body portion 21 formed at both ends of the main body portion 21 in the longitudinal direction D. Detects axial strain attached to the link mechanism consisting of the link portion 35 connecting the central weak portion 32 and the end weak portions 31, 33, and the central weak portion 32 and the end weak portions 31, 33. A strain detecting means (strain gauge 40) is provided. In the strain measuring device 20, the central weak portion 32 is formed at a position perpendicular to the longitudinal direction D and different from the edge weak portions 31 and 33. [Selection diagram] Fig. 3