Topic
Mandrel wrapping
About: Mandrel wrapping is a research topic. Over the lifetime, 24 publications have been published within this topic receiving 513 citations.
Papers
Patent•
4 Jun 1999
TL;DR: In this article, a dynamic pressure sensor with measures for its operation in high temperature and high pressure environments is presented, which uses at least one winding about a deformable mandrel of an optical fiber inscribed by a Bragg grating at its beginning and another at the end of the winding.
Abstract: A dynamic pressure sensor with measures for its operation in high temperature and high pressure environments. The sensor uses at least one winding about a deformable mandrel of an optical fiber inscribed by a Bragg grating at its beginning and another at the end of the winding. To counter the effects of high ambient static pressure and temperature, various steps are taken: the mandrel is filled with a high-viscosity low bulk modulus fluid, such as a silicone fluid, and is provided with a baffle system that regulates the flow of the fluid between spans around which the optical fiber is wound. The baffle system is based either on protuberances on a core rod inserted into the mandrel and a system of pinhole size passageways through the protuberances, or based on an open cell foam or fibrous material located on a core rod within a span covered by a stiff jacket. In addition, in high pressure gradient applications, the mandrel is pinched off at different locations along its length. To keep static strain low in the optical fiber windings, the mandrel is covered with materials soft enough that the tension-wound optical fiber can cut into the materials instead of building up unacceptable static strain.
93 citations
TL;DR: An acceleration insensitive interferometric hydrophone sensor having increased sensitivity comprises a rigid cylindrical support mandrel that is coaxial with and between thin walled sense and reference mandrels as mentioned in this paper.
Abstract: An acceleration insensitive interferometric hydrophone sensor having increased sensitivity comprises a rigid cylindrical support mandrel that is coaxial with and between thin walled sense and reference mandrels. Flanges on the reference and support mandrels form air filled cavities above and below optical reference and sense fiber windings, respectively, that are symmetrically wound on associated mandrels. The walls of the sense and reference mandrels are thin so that they both respond to the same incident acoustic wave signal although 180° out-of-phase. A central collar on the support mandrel provides an acceleration insensitive location for making attachment to the hydrophone. In another embodiment, the reference mandrel is much thicker than the sense mandrel and cavities supporting the sense fiber are caused to operate as acoustic impedance mismatches for rendering the reference fiber winding substantially insensitive to and acoustically decoupling it from an incident acoustic pressure wave signal. In yet another embodiment which does not employ a reference mandrel, the reference fiber is wound around the support mandrel in cavities above the latter that are caused to operate as acoustic mismatches. The junctions of the mandrels are preferably sealed for isolating the wound length of reference fiber and cavities from fluid in which the hydrophone sensor is located.
83 citations
Patent•
31 Oct 1977
TL;DR: An improved elongated blade or blade spar comprises successive low-pitch circumferentially wrapped convolutions of a synthetic resin impregnated tape having elongated cut glass and substantially parallel and equal length filaments wherein successive convolutions are overlapped approximately 50% and wherein the axis of the elongated strands lie at an angle of less than 30° from the elongation axis as mentioned in this paper.
Abstract: An improved elongated blade or blade spar comprises successive low-pitch circumferentially wrapped convolutions of a synthetic resin impregnated tape having elongated cut glass and substantially parallel and equal length filaments wherein successive convolutions are overlapped approximately 50% and wherein the axis of the elongated strands lie at an angle of less than 30° from the elongated spar axis. Preferably, resin impregnated filamentary strands are circumferentially wrapped around the mandrel substantially parallel with the direction of the tape wrap between selected tape layers. The improved blade spar mandrel wrapping apparatus includes a split ring support for the mandrel and through which the mandrel extends. The support ring halves may be separated, moved and rejoined during the mandrel wrapping process.
65 citations
Patent•
13 Dec 2007
TL;DR: In this article, a method for fabricating a one-piece composite fuselage section (110) that minimizes out-of-plane fiber distortion is presented. But this method requires the fabrication of a mandrel (14) having a coefficient of thermal expansion in the hoopwise direction that is sufficiently greater than that of the laid-up composite ply assembly.
Abstract: A method for fabricating a one-piece composite fuselage section (110) that minimizes out-of-plane fiber distortion. This is accomplished by fabricating a mandrel (14) having a coefficient of thermal expansion in the hoopwise direction that is sufficiently greater than that of the laid-up composite ply assembly. As a result of this differential in the coefficients of thermal expansion in the hoopwise direction, the laid-up composite ply assembly is stretched circumferentially as the mandrel expands radially during cure, thereby eliminating or reducing out-of-plane fiber distortion. At the same time, the mandrel and part being fabricated should have substantially the same coefficient of thermal expansion in the lengthwise direction. As the outer surface of the mandrel increases in circumference, the circumferentially oriented reinforcing fibers of the inner plies are stretched, while the circumferentially oriented reinforcing fibers of the outer plies do not reduce in circumference and thus do not form waves or wrinkles.
53 citations
Patent•
[...]
23 Apr 1979
TL;DR: An improved elongated blade or blade spar comprises successive low-pitch circumferentially wrapped convolutions of a synthetic resin impregnated tape having elongated cut glass and substantially parallel and equal length filaments wherein successive convolutions are overlapped approximately 50% and wherein the axis of the elongated strands lie at an angle of less than 30° from the elongation spar axis as discussed by the authors.
Abstract: An improved elongated blade or blade spar comprises successive low-pitch circumferentially wrapped convolutions of a synthetic resin impregnated tape having elongated cut glass and substantially parallel and equal length filaments wherein successive convolutions are overlapped approximately 50% and wherein the axis of the elongated strands lie at an angle of less than 30° from the elongated spar axis Preferably, resin impregnated filamentary strands are circumferentially wrapped around the mandrel substantially parallel with the direction of the tape wrap between selected tape layers The improved blade spar mandrel wrapping apparatus includes a split ring support for the mandrel and through which the mandrel extends The support ring halves may be separated, moved and rejoined during the mandrel wrapping process
44 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 1 |
| 2015 | 1 |
| 2014 | 1 |
| 2013 | 3 |
| 2012 | 1 |
| 2007 | 2 |