Abstract: A welded structural assembly and method, in one form, includes an upper substrate, a lower substrate adjacent the upper substrate, a fastener, and a sealing member. The fastener includes a shank portion, a first head portion, and a second head portion. The shank portion extends through the upper substrate and into the lower substrate. The shank is welded to the lower substrate. The first head portion has an outer periphery and an underside. The second head portion is frangibly coupled to the first head portion. The sealing member is disposed under the first head portion between the upper substrate and the first head portion. The sealing member contacts the underside and extends beyond the outer periphery such that the sealing member extends radially outward beyond all points of the first head portion.

Abstract: A method of producing a laminated article comprising placing a first metal skin, a core, and a second metal skin freely onto each other as discreet layers to provide a layered component; and forming the layered component into a shaped article via a die prior to producing a laminated article by applying pressure and heat to the shaped article, wherein at least the first skin moves relative to the core and/or second skin during the forming.

Abstract: A method of producing a laminated article comprising placing a first metal skin, a core, and a second metal skin freely onto each other as discrete layers to provide a layered component; and forming the layered component into a shaped article via a die prior to producing a laminated article by applying pressure and heat to the shaped article, wherein at least the first skin moves relative to the core and/or second skin during the forming.

Abstract: This application relates to methods and apparatus for monitoring hydraulic fracturing in well formation and fracture characterization using distributed acoustic sensing (DAS). The method involves interrogating an optic fiber arranged down the path of a borehole to provide a distributed acoustic sensor and also monitoring flow properties of fracturing liquid pumped into the well where the acoustic data from the distributed acoustic sensor is processed together with the flow properties data to provide an indication of at least one fracture characteristic.

Abstract: A system for moving object (402) detection is provided, the system comprising a fiber optic interrogator (106) adapted to provide distributed acoustic sensing on a optic fiber (104), for example arranged along a border. The measurement signals from each of a plurality of sensing portions (404, 406, 408, 410, 412) of said fiber are analyzed to determined a characteristic of a Doppler shift. The characteristic of a Doppler shift may be a generally continuous decrease in detected frequency. By detecting the time at which the rate of change of frequency is at a maximum for each of the sensing portions the time of closest approach (ti, t2, t3, t4, t5) of the object to those sensing portions can be determined with the sensing portion the object approaches closest to showing the greatest value of maximum rate of change of frequency. The distance of closest approach and velocity can be determined.

Abstract: A corrosion barrier for use under heads of a plurality of friction elements in a structural assembly and a method of installing the corrosion barrier are provided. The corrosion barrier defines a plurality of spaced apertures extending along a length of the corrosion barrier and a corresponding plurality of perforations concentrically located around the spaced apertures. A plurality of friction elements within a corresponding plurality of spaced apertures in a corrosion barrier forms a friction element strip assembly that is loaded into two workpieces. The two workpieces are joined together after an area of corrosion barrier is removed.

Abstract: A value stream process or method for forming vehicle rails from extruded aluminum tubes includes the steps of extruding an aluminum tube and hydroforming the extruded aluminum tube into a vehicle rail. More specifically, the method includes extruding the aluminum tube, bending the aluminum tube, preforming the aluminum tube, hydroforming the aluminum tube into a vehicle rail, trimming the vehicle rail to length and then artificially aging the rail followed by batch chemical pretreatment. In an alternative embodiment the artificial aging and batch chemical pretreatment processes are performed in reverse order. In either of the embodiments, localized induction annealing to recover formability may be performed between bending and preforming, between preforming and hydroforming or both.

Abstract: A welded structural assembly and method are provided, which in one form includes at least one upper substrate, at least one lower substrate disposed adjacent the upper substrate, and a fastener extending through the upper substrate and into the lower substrate. The fastener is welded to the lower substrate and defines a head portion having an outer periphery and an underside. A sealing member is disposed under the head portion and contacts the underside thereof, and further extends beyond the outer periphery of the head portion.

Abstract: Fiber optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fiber optic cable (210) comprises a core (208) and cladding (206) disposed within a buffer material (202) surrounded by a jacket (204) and arranged so that the core is offset from the center of the cable. By offsetting the core from the center of the jacket any bending effects on the core can be maximized compared to the core being located at the center of the cable.

Abstract: A method of producing a laminated article comprising placing a first metal skin, a core, and a second metal skin freely onto each other as discreet layers to provide a layered component; and forming the layered component into a shaped article via a die prior to producing a laminated article by applying pressure and heat to the shaped article, wherein at least the first skin moves relative to the core and/or second skin during the forming.

Abstract: A method of distributed fiber optic sensing is described in which an optical fiber (104) is interrogated with electromagnetic radiation; back-scattered radiation is detected; and the returns are processed to provide a measurement signal (310) for each of a plurality of longitudinal sensing portions of the optical fiber. The method comprises analyzing the measurement signals of a first subset of longitudinal sensing portions to provide a first zone (306a) having a first sensing function and analyzing the measurement signals of at least a second subset of longitudinal sensing portions to provide at least a second zone (306b) having a second, different, sensing function. The different sensing functions may include detecting different events of interest. In some embodiments the geometry of the fiber may provide different sensing zones (406a, 406b).

Abstract: A rack for simultaneously processing a plurality of parts includes a frame, a plurality of defined locations on the frame for receiving and holding individual parts for processing and a latching assembly for locking the parts to the frame in the defined locations. The rack further includes a security feature for indicating if the latching assembly is opened after the parts have been loaded and locked into the defined locations on the frame.

Abstract: Methods and apparatus for downhole monitoring are provided by interrogating an unmodified optic fiber (102) arranged along the path of a well bore (106) to provide a distributed acoustic sensor and sampling data gathered from a plurality of contiguous sensing portions of the fiber. The sampled data is processed to determine one or more well bore parameters. The well bore parameters may comprise a well condition profile, and may be obtained in response to an acoustic stimulus.

Abstract: Fiber optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fiber optic cable (210) comprises a core (208) and cladding (206) disposed within a buffer material (202) and surrounded by a jacket (204) and arranged so that the core is offset from the center of the cable. By offsetting the core from the center of the jacket any bending effects on the core can be maximised compared with the core being located at the center of the cable.

Abstract: Techniques for determining lateral offset of the source of an acoustic disturbance in a distributed acoustic fiber optic sensor are described. The sensor comprises an optical source (112) for interrogating an optical fiber (104) and a detector (116) and processor (108) arranged to detect any backscattered radiation and determine a measurement signal for a plurality of discrete longitudinal sensing portions of the optical fiber. The processor is also arranged to analyse the measurement signals to identify signals corresponding to the same acoustic wave arriving at different parts of the fiber and determine from the time of arrival of said acoustic wave the direction and/or distance of the origin of said acoustic wave from the optical fiber. The geometry of the fiber may be arranged to ensure that any positional ambiguity can be resolved and the use of multiple fibers (501, 502) is disclosed.

Abstract: This invention relates to the fiber optic distributed acoustic sensing to detect P and S waves in a solid medium. Distributed acoustic sensing can be achieved using an unmodified fiber optic by launching optical pulses into the fiber and detecting radiation which is Rayleigh backscattered there from. By analyzing the returns in analysis bins, acoustic disturbances can be detected in a plurality of discrete longitudinal sections of the fiber. The present invention extends such fiber distributed acoustic sensing to detection of S and P waves.

Abstract: This application describes methods and apparatus for downhole monitoring in real-time. The method involves interrogating an unmodified optic fiber (102) arranged along the path of a well bore (106) to provide a distributed acoustic sensor and sampling data gathered from a plurality of sensing portions of the fiber. The sampled data is then processed to provide a real-time indication of the acoustic signals detected by the sensing portions of the fiber. The real-time indication provides information to an operator or controller of the downwell process with real-time feedback data regarding what is happening during the downwell process which allows the identification of any problems and adjustment of the process parameters.

Abstract: A fiber-optic sensor array (100) comprises a line array of fiber-optic sensor packages (AX, BX, CX, DX, AY, BY, CY, DY, AZ, BZ, CZ, DZ) each having a package input/output (i/o) fiber and each being arranged to output a finite output pulse series of optical output pulses via the package i/o fiber in response to input thereto of one or more interrogating optical pulses. The array further comprises a fiber-optic bus (104,106, 108, 110) extending along the length of the line array, each package i/o fiber being optically coupled to the fiber-optic bus at a respective positions along the line array. The array allows interrogation at a higher frequency than is the case for a serial array of the same number of fiber-optic sensing packages.

Abstract: This application relates to methods and apparatus for monitoring hydraulic fracturing in well formation and fracture characterization using distributed acoustic sensing (DAS). The method involves interrogating an optic fiber arranged down the path of a borehole to provide a distributed acoustic sensor and also monitoring flow properties of fracturing liquid pumped into the well where the acoustic data from the distributed acoustic sensor is processed together with the flow properties data to provide an indication of at least one fracture characteristic.

Abstract: There is provided a system (100) for magnetic field detection, comprising a fiber optic interrogator (104) adapted to interrogate a first length of optical fiber (102) with interrogating radiation, detect radiation backscattered from said optical fiber and analyze said detected radiation to provide distributed sensing indicative of mechanical disturbances of said optical, wherein the optic fiber is mechanically coupled to a material whose dimensions vary dependent on applied magnetic field. Changes in dimensions of the optic fiber as can be detected by virtue of changes in back-scattering of light from said fiber using the principles of fiber optic distributed acoustic sensing.