3 results about "Pitch length" patented technology

The present invention discloses a method for solving the dispersion curve of ultrasonic guided waves of a multilayer helical structure, comprising establishing a 3D model of a multilayer helical structure in which each helical line has a single pitch length; meshing the cross section; calculating the mesh size in the mesh sweep direction; mesh sweeping each helical line; solving the unit stiffness matrix and unit mass matrix of each node, using a rectangular coordinate system for straight lines and a spiral coordinate system for spiral lines; assembling the cross-sectional overall stiffness matrix and cross-sectional overall mass matrix of each line, and assembling the pitch overall stiffness matrix and pitch overall mass matrix; periodically replicating and expanding the pitch overall stiffness matrix and pitch overall mass matrix of each line to assemble the overall stiffness matrix and overall mass matrix of the multilayer helical structure; solving the wave number, group velocity, and phase velocity; and matching the guided wave eigenvectors based on orthogonality. The present invention can achieve a fast and accurate solution to the dispersion curve of a multilayer helical structure composed of different pitches, handedness, sizes, or materials.

Tensioning devices with at least a portion of the tensioner face incorporating increased compliance of at least two pitch lengths in distance that meets compliance geometry requirements and applied force tensioner face stiffness requirements to decrease NVH through the incorporation of a cavity within the body of the tensioning deice, incorporation of a blade spring within the cavity of the tensioning device, incorporation of an elastomer within the cavity of the tensioning device, locating a compliance portion of the tensioner face at one end of the tensioner face of the tensioning device, and a spring utilized as a tensioning device with an elastomer face.

To provide a tire that achieves both peel resistance of sound-absorbing material and vulcanization failure resistance of the tire. [Solution] This tire comprises a pair of bead cores, a carcass layer spanning the pair of bead cores, a pair of cross belts arranged radially outward from the carcass layer, a release agent coating layer formed on the inner surface of the tire, and a sound-absorbing material 20 arranged on the inner surface of the tire. The sound-absorbing material 20 is positioned between a pair of straight lines and attached to the inner surface of the tire. The tire also comprises a plurality of ridges 21, 22 formed on the inner surface of the tire and extending in the width direction of the tire. Furthermore, the maximum value Pc_max of the pitch length Pc of the plurality of ridges 21 in the mounting area Rc of the sound-absorbing material 20 is in the range of 1.50 ≤ Pc_max / Psh_max ≤ 4.00 with respect to the maximum value Psh_max of the pitch length Psh of the plurality of ridges 21, 22 in each of the pair of shoulder areas Rsh, Rsh.