Method and device for monitoring damage condition of expansion joint based on noise

The invention provides a method and device for monitoring the damage condition of an expansion joint based on noise. The method comprises the steps that an original noise signal generated when a vehicle passes through the expansion joint is obtained; acquiring a characteristic signal of the expansion joint according to the original noise signal; inputting the characteristic signal of the expansion joint into a preset expansion joint health signal reconstruction model to obtain a model output signal; and obtaining a damage result of the expansion joint according to the characteristic signal of the expansion joint and the model output signal. As the expansion joint health signal reconstruction model is obtained by training the health noise signal, when the damaged expansion joint noise signal time-frequency spectrum enters the expansion joint health signal reconstruction model, the error between the input signal and the output signal is increased due to the deviation from the distribution ...

XML data storing method, method and device thereof for executing XML query

The invention provides an XML data storing method based on a simple path in an XML storehouse. The XML storehouse comprises a simple path storehouse and a data storehouse; the XML data storing methodcomprises the following steps: for nodes in an XML document, generating node identifiers for uniquely identifying the nodes; generating simple paths of the XML document; storing the simple paths intothe simple path storehouse; using the simple paths as indexes to store the data of each node in each simple path into the data storehouse sequentially; and the data comprises the node identifiers andthe values of the nodes. The XML data storing method enables the data to be stored in a simple path bunching way, and the data with one simple path are stored according to the order of the node identifiers. Without the mode of the XML document, XML data without modes can be processed and the query performance of the XML data can be increased, and moreover, the invention also provides an XML data storing ...

Two adjustable shrinkage cavity valves of pillar chain drive of buggy pipeline

The utility model discloses a two adjustable shrinkage cavity valves of pillar chain drive of buggy pipeline, include: casing, upper sprocket wheel, lower whorl sprocket, core, turnscrew, elevating screw, the side of casing set up to the infundibulate, the turnscrew install on the casing right side, its upper portion and cochain endless chain rotate, lower part and sprocket chain drive down, the core be the semi -circular arc board of from top to bottom installation, the core be connected with elevating screw, elevating screw be the reverse short silk thick stick of two screw threads, the one end of turnscrew be provided with the rocking arm. The core passes through the chain and drives the lead screw, realizes opening and shutting in step. Through implementing above technical scheme, technological effect below having: the utility model provides a shrinkage cavity equipment and simple structure, rapid operation, hourglass outside not having, daily operation low cost, the maintenance convenience ...

Pole piece detecting device of battery lamination machine

The invention discloses a pole piece detecting device of a battery lamination machine, comprising a vacuum suction device I, a vacuum suction device II, a vacuum suction device III and a left-right shifting mechanism, wherein the vacuum suction device I is used for taking away pole pieces from a pole piece supplying mechanism and moving the pole pieces to a pole piece shaping mechanism; the vacuum suction device II is used for taking away the pole pieces from the pole piece shaping mechanism and moving the pole pieces on a laminated substrate; the vacuum suction device III is used for detecting whether the pole pieces are placed in the pole piece shaping mechanism; the vacuum suction device I and the vacuum suction device II are respectively arranged on the left-right shifting mechanism; the vacuum suction device III is connected with the pole piece shaping mechanism; and the vacuum suction device I, the vacuum suction device II and the vacuum suction device III are respectively connected ...

Magnetic separation and coupling air-lifting suspension photocatalytic treatment method and its device

Method for reducing internal resistance of lithium-ion secondary battery and lithium-ion secondary battery

The invention discloses a method for reducing internal resistance of a lithium-ion secondary battery and the lithium-ion secondary battery. The method comprises a step of adding nano aluminum oxide into a battery anode material, or adding nano aluminum oxide into a battery cathode material, or adding nano aluminum oxide into a battery anode material and a battery cathode material at the same time during mixing, wherein the adding amount of the nano aluminum oxide is 1 to 3 percent of the total mass of active electrode substances. Because the nano aluminum oxide is used as an additive of the anode or cathode material of the lithium-ion secondary battery, the electric conductivity is increased and the internal resistance of the battery is reduced by using the nano superconducting effect of the nano material; and the preparation process has simple operation and low cost. The lithium-ion secondary battery prepared by the method has the advantages of low internal resistance, good multiplying ...

Diaphragm deviation detection device for battery laminating machine

The invention discloses a diaphragm deviation detection device for a battery laminating machine. The device comprises a power device, a connecting piece and a pair of photoelectric detection switches; the photoelectric detection switches are arranged at the two ends of a panel; one end of the connecting piece is connected with the panel; the other end of the connecting piece is connected with the power device; and the photoelectric switches, the connecting pieces and the power device are all connected into a main control circuit of the battery laminating machine. The diaphragm deviation detection device adopts photoelectric detection sensing technology, only needs to arrange the photoelectric detection switches at the two ends of the panel, and can accurately find the deviation of a diaphragm in a laminating film through photoelectric sensing; the precision is high; and the device can be suitable for various types of laminating machines, has low cost and a simple structure, and is convenient ...