Bend radius

About: Bend radius is a research topic. Over the lifetime, 3303 publications have been published within this topic receiving 35415 citations. The topic is also known as: minimum bend radius.

Manufacture of steel pipe by uoe-system

Abstract: PURPOSE:To manufacture an UOE-system steel pipe by a small press duty by U- forming a blank plate having properly bent ends and further, O-forming it by regulating an acting angle of forming force within a range of giving no circumferential compression, before welding, expanding, and straightening a formed plate. CONSTITUTION:A blank plate 10 is U-formed after subjecting the ends of plate 10 to an end bending by regulating a bending radius (rc) at the end parts within an allowable range of peaking between the end parts of plate 10 at the time of O-forming, or regulating it preferably to the degree of (rc)/R=0.62-0.75 with respect to the radius R of a desired steel pipe. Next, a welding is performed by restricting the O-forming within a range, where an acting angle of forming force with respect to the plate 10 is >=-45 deg. and gives no circumferential compression. Next, the out of roundness of a welded pipe is straightened while expanding it with a small expanding rate to obtain a steel pipe having a desired radius, thus a duty of forming press necessary for performing the O-forming in a UOE-system steel-pipe manufacturing is remarkably reduced.

Optical fiber, method of designing the same, and optical wavelength multiplex communication system

Abstract: PROBLEM TO BE SOLVED: To provide an optical fiber, a method of designing the same, and an optical wavelength multiplex communication system capable of increasing the number of transmittable signal wavelengths and input power in a WDM system. SOLUTION: In a PCF 1 including a core part and a clad part surrounding the core part, wherein the core part and the clad part are made of a medium having a uniform light refractive index and a plurality of uniform voids are formed in the clad part along the longitudinal direction, the PCF1 includes a void structure in which the value of a ratio d/Λ between the diameter d of the voids 2 and the interval Λ of the voids 2 is 0.42 to 0.63 and which can propagate only two modes of a fundamental propagation mode LP01 and a first harmonic mode LP11 of a signal light, wherein the bend loss αb in a bend radius of 30 mm is equal to or less than 0.005 dB/m, and the magnitude of effective cross-sectional area A eff is 150 μm 2 or more in all wavelength regions from about 1.0 to about 1.7 μm. COPYRIGHT: (C)2010,JPO&INPIT

Pointing Error in Passively Stabilized Spacecraft Caused by Thermal Bending

Abstract: An important component of passively stabilized earth orbiting spacecraft is a long thinwalled cylinder that points at all times towards the earth. When the cylinder is exposed to the sun, the side facing the sun heats up more than the far side causing it to bend away from the sun. In general, the differential thermal expansion produces stresses in the material of the boom; however, there is a particular distribution that does not produce stresses. Equations for determining the bending radius are derived for the no-stress and the general cases. Sample calculations are presented; although the results obtained for the two cases do not, in general, differ very much, there are instances for which the discrepancy is significant. Nomenclature a = absorptivity A = area of boom cross section, in.2 d = boom diameter, in. e = external emissivity #i = internal emissivity E = Young's modulus of elasticity, psi / = moment of inertia, in.4 k = thermal conductivity, Btu-ft/hr-ft2-°F K = integer m = number of sides of equilateral polygon M = couple, Ib-in. P — force, Ib R = radius of curvature, in. RL = radius of curvature according to the linearized theory, in. Ri = projection of the distance between center fiber and edge of the z'th element on the axis b-b (Fig. 4), in.

Influence of Fiber Manufacturing Tolerances on the Spectral Response of a Bend Loss Based All-fiber Edge Filter

Abstract: It is shown that manufacturing tolerances of the fiber parameters bend radius and numerical aperture (NA) significantly influence the fiber bend loss performance and spectral response of a fiber based edge filter. A theoretical model, validated by experimental results, is used to determine the changes in key spectral parameters for an edge filter, resulting from changes within their manufacturing tolerance range, for both the bend radius and NA. Finally, it is shown that bend-radius tuning during fabrication of such filters is a means of mitigating the effect of manufacturing variations.

Method for mounting electrical cable and cable protection apparatus to support

Abstract: A method of mounting an electrical cable (28) to a support structure (2) of an offshore electricity generating apparatus is disclosed. The method comprises mounting a cable protection apparatus (30) to an external surface of the support structure, wherein the cable protection apparatus comprises a plurality of first elements interconnected to define a channel for receiving the cable, wherein each first element is prevented from pivoting through more than a predetermined angle relative to a further first element attached thereto. The cable protection apparatus is mounted to the electrical cable such that the cable protection apparatus prevents the cable being bent around a bend radius smaller than a predetermined minimum bend radius and the cable protrudes from a lower end of the cable protection apparatus when mounted to the support structure.