157results about "Control" patented technology

Integral fiber optic-based condition sensors detect conditions of a composite structure, e.g., a coated wire assembly so as to detect damage or conditions that may damage the same. Preferably, at least one optical fiber sensor having a plurality of Bragg gratings written into the fiber at spaced-apart locations along its axial length is integrated into the electrical insulator coating of a wire, wire bundle or wiring harness. The fiber optic sensor may thus be employed to measure the environmental loads on the electrical wiring including stresses from bending, axial loading, pinch points, high temperature excursions and chemical damage. The system is capable of detecting and locating transient conditions that might cause damage to a wiring system or permanent changes in state associated with damage events. The residual stress in the electrical insulator coating of a wire, wire bundle, or wiring harness are used to monitor the evolution of damage by wear or chaffing processes. Detected stress relief on one or more Bragg gratings will thus be indicative of damage to the insulator coating on the conductor. As such, the magnitude of such stress relief may be detected and used as an alert that the wire insulation is damaged to an unsafe extent.

An electric cable includes a strain sensor longitudinally extending along the cable and including a strain optical fibre arranged within a bending neutral region surrounding and including a bending neutral longitudinal axis of the electric cable, and at least two longitudinal structural elements, at least one of the at least two longitudinal structural elements being a core including an electrical conductor, wherein the strain sensor is embedded in a strain-transferring filler mechanically coupling at least one of the at least two longitudinal structural elements with the strain sensor. With the disclosed cable construction, the strain experienced by the at least one of the at least two longitudinal structural elements is transferred to the strain sensor at least in a strained condition. In the preferred embodiments, the electric cable is a heavy-duty cable.

A method for monitoring at least the bending strain of at least one electric cable provided with at least one peripheral mechanically non-symmetric strength member is provided.

A load bearing member, such as a polymer cord reinforced belt, includes at least one element of a different material having a characteristic that distinguishes it from the polymer fibers that make up the strands of the cord. The element of second material has a configuration that is repeated along the length of the load bearing member. The configuration of the second material element provides a readily detectible indication of localized strain on the load bearing member. As the load bearing member is strained over time, the configuration of the second material element is also altered. Analyzing the configuration of the second material element along the length of the load bearing member provides information regarding the condition of the belt.

The invention discloses a flexible magnetostriction and magnetoelastic integrated sensor for detecting stress and defect of a wire rope. The integrated sensor comprises an inner flexible printing coil and an outer flexible printing coil, wherein the structure of the flexible printing coil can be curled and attached to the surface of the wire rope to form a single-layer or multi-layer solenoid coil which is locked by a connector and then mounted on the detected wire rope; and after the locked state is released, the solenoid coil is removed from the surface of the wire rope. The integrated sensor can work as a magnetostriction sensor and excite a longitudinal modal ultrasonic guide wave in the wire rope to perform long-distance defect detection of the wire rope or to measure the average stress of the wire rope in a certain distance based on the acoustoelastic effect of the ultrasonic guide wave; and the integrated sensor also can work as a magnetoelastic sensor and calculate the stress value of a section of the wire rope based on the magnetoelastic effect by measuring the magnetic conductivity of the material of the wire rope, or scan along the length direction of the wire rope to obtain the change of the magnetic conductivity of the material of the wire rope along the length direction and reflect the size and position of the defect.

A method of fault detection of a belt or rope includes interconnecting a plurality of cords of the belt or rope, the cords including a plurality of wires, to form a bridge circuit. A fault detection bridge circuit is subjected to a voltage excitation and outputs a voltage which is indicative of the belt or rope damage but remaining insensitive to other environmental noises.

An electrical cable having a holding member arranged longitudinally along the cable for an optic fiber, which can be used for temperature sensing and/or communications. The holding member can replace one or more strands of the cable, be placed inside an interstice of the cable, be placed in between various layers of the cable, or placed in the jacket of the cable. The cable can be produced through the addition of a planetary strander device to a wire assembly apparatus.

A rope for a hoisting device, in particular for an elevator, includes at least one continuous load bearing member extending in longitudinal direction of the rope throughout the length of the rope, the load bearing member being made of composite material including reinforcing fibers embedded in polymer matrix. The composite material includes capsules embedded in the polymer matrix, the capsules storing monomer substance in fluid form. An elevator includes a rope of the aforementioned kind and a method for condition monitoring of a rope of an elevator.

A bridge intelligent cable system with a built-in fiber grating sensor is provided, which is applied in a cable bearing structure such as a cable-stayed bridge, a suspension bridge, and an arch bridge. The system includes an anchor cup (1), a wire dividing plate (5), a connecting cylinder (4), a fiber grating sensor, and a cable body (11), in which the fiber grating sensor includes a fiber grating strain sensor (9) and a fiber grating temperature sensor (10), tail fibers of the fiber grating strain sensor (9) and the fiber grating temperature sensor (10) are led out, the packaged fiber grating strain sensor (9) is fixedly connected to an outer-layer steel wire (3) of the connecting cylinder (4), the packaged fiber grating temperature sensor (10) is suspended on the steel wire (3) of the connecting cylinder (4), holes (5-1) are punched in the wire dividing plate (5), and a preserved steel pipe (7) is buried in advance in the connecting cylinder (4) and the anchor cup (1). The system improves survival rates of the fiber grating sensor and the fibers in cable manufacturing and application processes, ensures reliability of the embedding technology of the fiber grating sensor, and effectively leads a fiber grating signal out of the cable body without distortion.

A testing device includes a receiving unit for electromagnetic signals arranged on a carrier element to be tested to generate test data from received electromagnetic radiation. The test data are evaluated in a processing system in order to determine a deviation of the test data from a nominal state of the carrier element. The testing device is used to test a carrier element of an elevator installation on which the elevator car is suspended.

The invention provides a fiber bragg grating intelligent steel strand. The fiber bragg grating intelligent steel strand comprises a center wire and side wires, wherein the center wire and the side wires are twisted; at least one groove is formed in the center wire, optical fiber is placed in the grooves, and at least one grating is carved in the optical fiber. The invention further provides a manufacturing method of the fiber bragg grating intelligent steel strand. The technical problem that the laying process survival rate is low and monitoring range is narrow when stress conditions of the steel strand is monitored by an existing fiber bragg grating are solved.

The invention relates to a method and apparatus for measuring lay length of a wire rope having a number or external strands to form a rope having spiral grooves in the surface between the strands. A magnetic flux circuit is generated, part of which is formed within a region of the advancing wire rope. Variations of magnetic field around the region of the rope or variations of magnetic flux entering or leaving the rope are sensed by at least two sensors arranged around the rope. Signals from the sensors are subtractively combined to eliminate variations due to off-axis movements of the rope, and the combined signals reveal an oscillating pattern due to the undulating surface of the rope. Linking the oscillating pattern to distance along the rope reveals the lay length, which corresponds to a number of oscillations which is the same as the number of strands at the surface.

A method for monitoring the torsion of a cable includes the steps of: providing a cable having an outer surface and extending along a longitudinal direction, the cable being provided with at least one identification tag, preferably an RFID tag, arranged in a tag angular position in a cross-sectional plane taken transverse to the longitudinal direction, the at least one tag storing a tag identification code and being capable of transmitting a tag electromagnetic signal; interrogating the at least one identification tag to receive the tag electromagnetic signal, and detecting the tag electromagnetic signal, wherein the step of detecting the tag electromagnetic signal includes the step of reading the tag identification code and determining the tag angular position of the at least one identification tag. A torsion monitoring system of a cable includes at least one identification tag.

An inspection equipment to detect twist of a wire rope with high precision by taking influences of change in the rope pitch due to the relative movement between the rope and the inspection equipment and tension of the rope into consideration, a magnetization device (2) magnetizes a wire rope (1) in a longitudinal direction thereof, the wire rope being produced by twisting steel wire bundles; magnetic detectors (8a-8h) disposed near the wire rope detect magnetic flux leakage from the wire rope, an arithmetic unit calculates (9,10,11) a rope pitch using a relative velocity between the wire rope and the inspection equipment from an encoder (7) and the magnetic flux leakage and corrects (12) elongation of the rope due to the tension measured by a tension measurement unit (6,13) based on the calculated pitch to thereby calculate (14,15) twist of the rope, and supplies results of the calculation to determine acceptability or inacceptability of the rope (16,17).

A cable 1 comprises a first thimble 2 and a second thimble 4, at least one yarn 6, and at least a first conductive fibre 8 for monitoring the cable 1. The yarn 6 extends from the first thimble 2 to the second thimble 4, turns around the second thimble 4, extends from the second thimble 4 to the first thimble 2, and turns around the first thimble 2. Each thimble holds a stack 9 of layers 10 of turns of the yarn 6. The first conductive fibre 8 is designed to signal the wear of the yarn 6 by breaking after a predetermined portion of the turns of the yarn 6 breaks. The first conductive fibre 8 is positioned at the first thimble 2 between the turns of the yarn 6 at less than 50% of the stack height h.

The invention relates to a method for assembling a cable built-in fiber bragg grating strain transducer. The method comprises the following technical processes of: sleeving a hoop onto a peripheral steel wire of a cable connecting cylinder place to be assembled with the fiber bragg grating strain transducer before working procedures of feeding and heading the cable to complete preassembly of the hoop; fixing the fiber bragg grating strain transducer on the surface of the peripheral steel wire of the cable connecting cylinder place with the hoop in the area of a cable connecting cylinder after finishing the working procedure of anchoring the cable; adding a transducer protection cover to protect the fiber bragg grating strain transducer fixed on the surface of the peripheral steel wire of the cable connecting cylinder place after fixing the fiber bragg grating strain transducer, and sealing gaps among the transducer protection cover and the peripheral steel wire of the cable connecting cylinder place; and penetrating a tail cable of the fiber bragg grating strain transducer into a reserved steel tube channel arranged in the cable connecting cylinder and a socket, and protecting the joint of the tail cable and the reserved steel tube with a heat-shrinkable bush in a hot shrinkage way. The method effectively ensures reliability and long-term stability of intelligent cabling operation.

The invention discloses a control system of a stranding machine. The control system of the stranding machine comprises a man-machine interaction module, a main shaft control module and a taking-up control module, wherein the main shaft control module comprises a first driving unit used for driving a main shaft, the taking-up control module comprises a control unit, a first detecting unit and a second driving unit, the first detecting unit and the second driving unit are in signal connection with the control unit, the man-machine interaction module is in signal connection with the first driving unit of the main shaft control module and the control unit of the taking-up control module, and the first detecting unit is in signal connection with the main shaft control module. The invention further discloses a control method of the stranding machine. According to the control system of the stranding machine and the control method of the stranding machine, the rotating speed of the main shaft corresponds to the rotating speed of a stranding bow in a stranding process, the rotating speed of a taking-up motor corresponds to the rotating speed of a taking-up wheel, the combination of different rotating speeds of the main shaft and speeds of the taking-up motor corresponds to different stranding distances, the stranding distance can be adjusted through the control of the rotating speed of the main shaft and the rotating speed of the taking-up wheel, a transmission mechanism, used for adjusting the speed of a gear, of an ordinary stranding machine is eliminated, therefore, cost is saved and efficiency is improved.