| 摘要 |
The mechanical structure (100) comprises a mobile means (3) suspended by beams (4,5,6,7) on a fixed frame (2), and elongation elements (23,24,25,26) connected to each beam between anchoring elements (8,9) and the mobile mass (3). The elongation elements form with the beams an improved suspension system, wherein the elongation elements are deformable in the XOY plane and designed for an asymmetric stiffness response of beams so that a force of the same magnitude in the OX direction causes an apparent variation of stiffness which is lower in that direction than in the opposite direction, that is an expansion versus compression. The elongation elements are in the form of a beam with two extremities and an axial line forming a hollow with a bottom, where the beam is symmetric with respect to the axis of suspension, and the axial line is in the form of two symmetric parts, each with an inflexion point. The tangent to the axial line at each extremity is at an angle in the range 0-45 deg. with the direction perpendicular to the axis of symmetry. The tangent to the axial line at the point of intersection with the axis of symmetry is perpendicular to the latter. The elongation elements are connected at the anchoring elements, or at the mobile mass as in the second embodiment, or at the anchoring elements and at the mobile mass. The elongation elements are composed of several, e.g. two, elongation beams. The structure comprises two sets of improved suspension symmetric with respect to an axis, or four symmetric two-by-two. The axial line presents a hollow with a bottom constituted by a straight-line segment. The device, in particular a sensor, incorporates a mechanical structure of proposed type. |
