Acquisition and verification conversion device of multi-channel flexible distributed strain acquisition system

Abstract

The invention belongs to the technical field of multi-channel flexible distributed strain acquisition system acquisition and verification design, and particularly relates to a multi-channel flexible distributed strain acquisition system acquisition and verification conversion device which is internally provided with a plurality of relays. Each relay is provided with a normally-closed contact and a normally-open contact, the normally-closed contacts are connected with the data acquisition ends of the channels and the flexible strain gauges of the channels, and the normally-open contacts are connected with the metering verification ends of the channels and the strain metering standards of the channels; when the control end of each relay is disconnected, the normally closed contact is closed, and each flexible strain gauge can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally closed contact; when the control end of each relay is connected, the normally open contact is closed, and each strain measurement standard can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally open contact.

Description

Technical Field

[0001] The present application belongs to the technical field of multi-channel flexible distributed strain acquisition system acquisition and verification design, and specifically relates to a multi-channel flexible distributed strain acquisition system acquisition and verification conversion device. Background Art

[0002] Flexible strain gauges are sensors made of flexible materials. They are small in size, light in weight, have good flexibility and ductility, and can even be bent and folded freely. They have various structural forms and can be arranged arbitrarily according to the requirements of actual measurement conditions and pasted on the surface of the specimen. They can easily detect complex specimens.

[0003] In aircraft structural strength tests, in order to obtain comprehensive test data, it is necessary to attach thousands to tens of thousands of flexible strain gauges to the fuselage. The flexible strain gauges are connected to a flexible distributed strain acquisition system for data collection, which is then transmitted wirelessly to a display storage terminal. This can avoid the additional loads generated by the use of a large number of connecting cables, which would affect the reliability of the test data.

[0004] At present, the flexible distributed strain acquisition system has a data acquisition port and a metrology verification port. The data acquisition port is used to connect the strain gauge to perform data acquisition during data acquisition; the metrology verification port is used to connect the strain measurement standard to perform metrology verification and calibrate the flexible distributed strain acquisition system during metrology verification.

[0005] At present, for the flexible distributed strain acquisition system, switching between data acquisition and metrological verification is mainly carried out by plugging and unplugging the socket back and forth, which is inconvenient to operate, seriously affecting the service life of the connector and even causing damage to the system.

[0006] This application is proposed in view of the above-mentioned technical defects. Summary of the invention

[0007] The purpose of the present application is to provide a multi-channel flexible distributed strain acquisition system acquisition and verification conversion device to overcome or alleviate at least one aspect of the known technical defects.

[0008] The technical solution of this application is:

[0009] A multi-channel flexible distributed strain acquisition system acquisition and verification conversion device, which is provided with a plurality of relays;

[0010] Each relay has a normally closed contact and a normally open contact, wherein the normally closed contact is connected to the data acquisition end of each channel and its flexible strain gauge, and the normally open contact is connected to the measurement verification end of each channel and its strain measurement standard;

[0011] When the control end of each relay is disconnected, the normally closed contact is closed, and each flexible strain gauge can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally closed contact, and the multi-channel flexible distributed strain acquisition system can perform data acquisition. At this time, the normally open contact of each relay is disconnected, and the strain measurement standard will not be connected to the multi-channel flexible distributed strain acquisition system, and will not affect the data acquisition;

[0012] When the control end of each relay is turned on, the normally open contact is closed, and each strain measurement standard can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally open contact, and the multi-channel flexible distributed strain acquisition system can be measured and calibrated. At this time, the normally closed contacts of each relay are disconnected, and the flexible strain gauge will not be connected to the multi-channel flexible distributed strain acquisition system, and will not affect the measurement and calibration.

[0013] According to at least one embodiment of the present application, the above-mentioned multi-channel flexible distributed strain acquisition system acquisition and verification conversion device is embedded in the multi-channel flexible distributed strain acquisition system and is connected to the data acquisition end and the measurement and verification end through an interface socket.

[0014] According to at least one embodiment of the present application, in the above-mentioned multi-channel flexible distributed strain acquisition system acquisition and verification conversion device, the interface socket connecting the data acquisition end and the measurement and verification end adopts a double-row bull-horn socket.

[0015] According to at least one embodiment of the present application, in the above-mentioned multi-channel flexible distributed strain acquisition system acquisition and verification conversion device, the control ends of the respective relays are arranged in series.

[0016] According to at least one embodiment of the present application, in the above-mentioned multi-channel flexible distributed strain acquisition system acquisition and verification conversion device, the control end of each relay is powered by a lithium battery.

[0017] This application has at least the following beneficial technical effects:

[0018] A multi-channel flexible distributed strain acquisition system acquisition and verification conversion device is provided, which can realize automatic switching between data acquisition and metrological verification of the multi-channel flexible distributed strain acquisition system, can realize in-situ measurement, and has the advantages of automatic control, high verification efficiency, strong anti-interference, etc. It is very convenient for switching data acquisition and metrological verification of large-scale multi-channel flexible distributed strain acquisition systems, and can reduce the damage to the system caused by plugging and unplugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the multi-channel flexible distributed strain acquisition system acquisition and verification conversion device provided in the embodiment of the present application, which is connected to the multi-channel flexible distributed strain acquisition system and its flexible strain gauge and strain measurement standard;

[0020] Figure 2 It is a schematic diagram of a multi-channel flexible distributed strain acquisition system acquisition and verification conversion device provided in an embodiment of the present application, which is arranged in a multi-channel flexible distributed strain acquisition system.

[0021] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0022] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0023] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0024] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0025] A multi-channel flexible distributed strain acquisition system acquisition and verification conversion device, which is provided with a plurality of relays;

[0026] Each relay has a normally closed contact and a normally open contact. The normally closed contact is connected to the data acquisition end of each channel and its flexible strain gauge, and the normally open contact is connected to the measurement verification end of each channel and its strain measurement standard, such as Figure 1 shown.

[0027] When the control end of each relay is disconnected, the normally closed contact is closed, and each flexible strain gauge can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally closed contact. The multi-channel flexible distributed strain acquisition system can perform data acquisition. At this time, the normally open contacts of each relay are disconnected, and the strain measurement standard will not be connected to the multi-channel flexible distributed strain acquisition system, which will not affect the data acquisition.

[0028] When the control end of each relay is turned on, the normally open contact is closed, and each strain measurement standard can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally open contact, and the multi-channel flexible distributed strain acquisition system can be measured and calibrated. At this time, the normally closed contacts of each relay are disconnected, and the flexible strain gauge will not be connected to the multi-channel flexible distributed strain acquisition system, and will not affect the measurement and calibration.

[0029] After the metrological verification of the multi-channel flexible distributed strain acquisition system is completed, the control ends of each relay can be disconnected, the normally closed contacts are automatically closed, and the normally open contacts are automatically disconnected. The multi-channel flexible distributed strain acquisition system can automatically resume data acquisition, thereby realizing automatic switching between data acquisition and metrological verification of the multi-channel flexible distributed strain acquisition system, and realizing in-situ measurement. It has the advantages of automatic control, high verification efficiency, and strong anti-interference. It is very convenient for large-scale multi-channel flexible distributed strain acquisition systems to switch between data acquisition and metrological verification, and can reduce the damage to the system caused by plugging and unplugging.

[0030] The multi-channel flexible distributed strain acquisition system acquisition and verification conversion device can be embedded in the multi-channel flexible distributed strain acquisition system, and connected to the data acquisition end and the measurement verification end through the interface socket, such as Figure 2 As shown, the interface socket can adopt a double-row header socket.

[0031] In the acquisition and verification conversion device of the multi-channel flexible distributed strain acquisition system, each relay adopts a micro relay, and the control end of each relay is arranged in series and powered by a lithium battery.

[0032] In a specific example, a circuit board design is adopted to design a multi-channel flexible distributed strain acquisition system acquisition and verification conversion device with 12 channels. The relays select 3 groups of 4-open and 4-closed micro relays to meet the simultaneous switching of 2 channels. The multi-channel flexible distributed strain acquisition system is attached to the surface of the test piece. In order to eliminate the error caused by the wire resistance, a three-wire connection method is adopted. The product weight is about 40 grams, which is negligible compared to the test load.

[0033] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A multi-channel flexible distributed strain acquisition system acquisition and verification conversion device, characterized in that: A plurality of relays are arranged inside; Each relay has a normally closed contact and a normally open contact, wherein the normally closed contact is connected to the data acquisition end of each channel and its flexible strain gauge, and the normally open contact is connected to the measurement verification end of each channel and its strain measurement standard; When the control end of each relay is disconnected, the normally closed contact is closed, and each flexible strain gauge can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally closed contact, and the multi-channel flexible distributed strain acquisition system can perform data acquisition. At this time, the normally open contact of each relay is disconnected, and the strain measurement standard will not be connected to the multi-channel flexible distributed strain acquisition system, and will not affect the data acquisition; When the control end of each relay is turned on, the normally open contact is closed, and each strain measurement standard can be connected to the multi-channel flexible distributed strain acquisition system through the corresponding normally open contact, and the multi-channel flexible distributed strain acquisition system can be measured and calibrated. At this time, the normally closed contacts of each relay are disconnected, and the flexible strain gauge will not be connected to the multi-channel flexible distributed strain acquisition system, and will not affect the measurement and calibration.

2. The multi-channel flexible distributed strain acquisition system acquisition and verification conversion device according to claim 1 is characterized in that: It is embedded in the multi-channel flexible distributed strain acquisition system and connected to the data acquisition end and the measurement and verification end through the interface socket.

3. The multi-channel flexible distributed strain acquisition system acquisition and verification conversion device according to claim 1 is characterized in that: The interface sockets connecting the data acquisition end and the measurement verification end adopt double-row bull-horn sockets.

4. The multi-channel flexible distributed strain acquisition system acquisition and verification conversion device according to claim 1 is characterized in that: The control terminals of the various relays are connected in series.

5. The multi-channel flexible distributed strain acquisition system acquisition and verification conversion device according to claim 1 is characterized in that: The control end of each relay is powered by a lithium battery.

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