Strain measurement channel time-sharing multiplexing device supporting multi-model test

Abstract

The application provides a strain measurement channel time-sharing multiplexing device supporting multi-type test, belongs to the technical field of aircraft structure strength test, and specifically comprises a program-controlled multiplexing box, the program-controlled multiplexing box comprises multiple groups of strain signal multiplexing conditioning units and a power supply assembly, each group of strain signal multiplexing conditioning units comprises a multiplexing conditioning board, a plurality of strain signal input interfaces and a strain signal output interface, the multiplexing conditioning board is used for selecting one of the plurality of strain signal input interfaces through program-controlled switching, and inputting the accessed strain signal to a strain acquisition instrument through the strain signal output interface, and the strain signal input interfaces selected by the multiplexing conditioning boards correspond to the same test object simultaneously. The processing scheme of the application realizes the strength test task of multiple types of aircrafts in different periods through a set of equipment, and greatly saves the investment in equipment funds.

Description

Technical Field

[0001] This application relates to the field of aircraft structural strength testing, and in particular to a strain measurement channel time-division multiplexing device that supports multi-aircraft testing. Background Technology

[0002] In static structural strength tests of aircraft, a large number of strain gauges are often attached to obtain stress data for different structural parts of the aircraft during the test. Currently, the challenges include complex aircraft structures, large measurement ranges, and numerous test conditions. Furthermore, with the increase in test items for different models, tight test schedules, and a high degree of parallel testing across multiple aircraft, the required measurement scale is large. Measurement equipment for multiple aircraft models and multiple test conditions must be prepared all at once, and data acquisition equipment and resources cannot be used in a staggered manner, placing significant pressure on data measurement preparation. Simply adding more acquisition channels will inevitably lead to an overabundance of channels, resulting in low equipment utilization efficiency. Moreover, conducting tests on multiple aircraft models simultaneously will create enormous pressure, and the current approach cannot meet the testing requirements. Summary of the Invention

[0003] In view of this, this application provides a strain measurement channel time-division multiplexing device that supports multi-model testing, which solves the problems in the prior art and enables the completion of tests on multiple models at different times based on a single measurement device.

[0004] The strain measurement channel time-division multiplexing device supporting multi-model testing provided in this application adopts the following technical solution:

[0005] A strain measurement channel time-division multiplexing device supporting multi-model testing includes a programmable multiplexing box. The programmable multiplexing box includes multiple strain signal multiplexing and conditioning units and a power supply component. Each strain signal multiplexing and conditioning unit includes a multiplexing and conditioning board, several strain signal input interfaces and a strain signal output interface. The number of test objects supported by a single programmable multiplexing box is the same as the number of strain signal input interfaces of the same group of strain signal multiplexing and conditioning units. One strain signal input interface is connected to one strain cable corresponding to the test. Each strain signal input interface of the same group of strain signal multiplexing and conditioning units is connected to one strain cable of a different test object. Each strain cable of the same test object is connected to the strain signal input interface of a different group of strain signal multiplexing and conditioning units. The multiplexing conditioning board is used to select one of several strain signal input interfaces through programmable switching, and input the input strain signal to the strain acquisition instrument through the strain signal output interface. Each strain signal input interface selected by the multiplexing conditioning board at the same time corresponds to the same test object. The power supply component supplies power to the multiplexer conditioning board.

[0006] Optionally, the programmable multiplexing box also includes a network interface, which is communicatively connected to each multiplexing conditioning board. The network interface is used to interconnect multiple programmable multiplexing boxes through a switch to expand the total number of strain signal input interfaces.

[0007] Optionally, the programmable multiplexing box includes four sets of strain signal multiplexing and conditioning units.

[0008] Optionally, the number of strain signal input interfaces in the same group of strain signal multiplexing and conditioning units is 4.

[0009] Optionally, each strain signal input interface corresponds to 16 strain measurement channels.

[0010] Optionally, a strain measurement channel time-division multiplexing device supporting multi-model testing is used in a three-wire strain testing system. The multiplexing conditioning board is a three-wire multiplexing switching conditioning board. The three wires of the multiplexing conditioning board are connected to the three transmission cables from the strain gauge to the strain acquisition instrument. The three transmission cables transmit the excitation output signal, the excitation input signal, and the strain measurement signal, respectively. The multiplexing conditioning board achieves synchronous programmable switching of the three-wire strain signal by simulating a multiplexer, and controls the conduction and disconnection of the three transmission cables by inputting the control signal of the multiplexing conditioning board.

[0011] Optionally, the strain signal input interface is a 50-pin DB50 rectangular connector.

[0012] In summary, this application includes the following beneficial technical effects: This application supports strength testing tasks for various machine models at different times, greatly saving on equipment investment. Furthermore, multiple programmable multiplexer boxes are connected via a switch, allowing for easy program switching and shortening the testing cycle. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the programmable multiplexing box in the embodiments of this application; Figure 2 This is a schematic diagram of a single-channel three-wire multiplexing circuit for a multiplexing conditioning board in an embodiment of this application. Detailed Implementation

[0015] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0016] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0018] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0020] This application provides a strain measurement channel time-division multiplexing device that supports multi-model testing.

[0021] like Figure 1 and Figure 2As shown, a strain measurement channel time-division multiplexing device supporting multi-model testing includes a programmable multiplexing box. The programmable multiplexing box includes multiple strain signal multiplexing and conditioning units and power supply components. Each strain signal multiplexing and conditioning unit includes a multiplexing and conditioning board, several strain signal input interfaces and a strain signal output interface.

[0022] The number of test objects supported by a single programmable multiplexing box is the same as the number of strain signal input interfaces of the same group of strain signal multiplexing and conditioning units. Each strain signal input interface is connected to a strain cable corresponding to the test. Each strain signal input interface of the same group of strain signal multiplexing and conditioning units is connected to one strain cable of a different test object. Each strain cable of the same test object is connected to the strain signal input interface of a different group of strain signal multiplexing and conditioning units.

[0023] The multiplexing conditioning board is used to select one of several strain signal input interfaces through programmable switching, and input the input strain signal to the strain acquisition instrument through the strain signal output interface. The strain signal input interfaces selected by each multiplexing conditioning board at the same time correspond to the same test object.

[0024] The power supply component supplies power to the multiplexed conditioning board, which controls the power supply and power cut-off of the strain gauges by receiving control signals.

[0025] A time-division multiplexing device for strain measurement channels supporting multi-model testing is used in a three-wire strain testing system. The multiplexing conditioning board is a three-wire multiplexing switching conditioning board. The three wires of the multiplexing conditioning board correspond to the three transmission cables connecting the strain gauge to the strain acquisition instrument. The three transmission cables transmit the excitation output signal, the excitation input signal, and the strain measurement signal, respectively. The strain measurement signal is connected to the signal input interface of the strain acquisition instrument. The excitation output signal is a stable DC power supply signal used to provide operating power to the Wheatstone bridge of the strain gauge. The power supply of the strain gauge comes from the power supply component through the multiplexing conditioning board. The excitation input signal is a DC feedback signal of the same origin as the excitation output signal, used to calibrate the excitation deviation.

[0026] The multiplexing conditioning board achieves synchronous programmable switching of the three-wire strain signal by simulating a multiplexer, and controls the conduction and disconnection of the three transmission cables by inputting the control signal of the multiplexing conditioning board.

[0027] In this embodiment, the programmable multiplexing box includes four sets of strain signal multiplexing and conditioning units. The number of strain signal multiplexing and conditioning units corresponds to the number of strain cables that can be connected to each test object. That is, one programmable multiplexing box in this embodiment can support the connection of four strain cables to each test object. The number of strain signal input interfaces in each set of strain signal multiplexing and conditioning units corresponds to the number of test objects supported. Specifically, in this embodiment, the number of strain signal input interfaces in the same set of strain signal multiplexing and conditioning units is four. That is, one programmable multiplexing box in this embodiment can support the connection of four test objects. In this embodiment, each strain signal input interface corresponds to 16 strain measurement channels. This embodiment can transfer 256 signals to a 64-channel strain acquisition instrument. The strain acquisition instrument converts analog electrical signals into digital signals and uploads them to a computer for storage and display via a switch. In this embodiment, the output channel ratio of the strain acquisition instrument and the programmable multiplexing box is 1:1.

[0028] The programmable multiplexing box also includes a network interface, which is communicatively connected to each multiplexing conditioning board. The network interface is used to interconnect multiple programmable multiplexing boxes via a switch to expand the total number of strain signal input interfaces. Interconnecting multiple programmable multiplexing boxes increases the number of strain signal multiplexing conditioning units, thereby increasing the number of strain cables that can be connected to each test object. Specifically, this application allows for the connection of four test objects and several strain cables for each test object after interconnecting multiple programmable multiplexing boxes. The specific number of interconnected programmable multiplexing boxes depends on the number of test points for each test object. Then, each multiplexing conditioning board simultaneously selects all strain signal input interfaces corresponding to the same test object to conduct a test. After one test object completes its test, each multiplexing conditioning board simultaneously selects the next test object, and so on, completing the tests for all four test objects sequentially. This achieves time-segmented testing of all strain measurement points for four test objects using a single device.

[0029] The strain signal input interface described in this embodiment is a 50-pin DB50 rectangular connector; it can be matched with all currently used measurement equipment interfaces and has strong versatility.

[0030] In other embodiments, the number of strain signal input interfaces of the same group of strain signal multiplexing and conditioning units is not limited to four. The number of strain signal input interfaces of each group of strain signal multiplexing and conditioning units can be increased as needed, enabling the testing of more test objects at different times to be completed on a single set of measuring equipment.

[0031] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A strain measurement channel time-division multiplexing device supporting multi-model testing, characterized in that, The system includes a programmable multiplexing box, which comprises multiple strain signal multiplexing and conditioning units and a power supply assembly. Each strain signal multiplexing and conditioning unit includes a multiplexing and conditioning board, several strain signal input interfaces and a strain signal output interface. The number of test objects supported by a single programmable multiplexing box is the same as the number of strain signal input interfaces of the same group of strain signal multiplexing and conditioning units. One strain signal input interface is connected to one strain cable corresponding to the test. Each strain signal input interface of the same group of strain signal multiplexing and conditioning units is connected to one strain cable of a different test object. Each strain cable of the same test object is connected to the strain signal input interface of a different group of strain signal multiplexing and conditioning units. The multiplexing conditioning board is used to select one of several strain signal input interfaces through programmable switching, and input the input strain signal to the strain acquisition instrument through the strain signal output interface. Each strain signal input interface selected by the multiplexing conditioning board at the same time corresponds to the same test object. The power supply component supplies power to the multiplexer conditioning board.

2. The strain measurement channel time-division multiplexing device supporting multi-model testing according to claim 1, characterized in that, The programmable multiplexing box also includes a network interface, which is communicatively connected to each multiplexing conditioning board. The network interface is used to interconnect multiple programmable multiplexing boxes through a switch to expand the total number of strain signal input interfaces.

3. The strain measurement channel time-division multiplexing device supporting multi-model testing according to claim 1, characterized in that, The programmable multiplexing box includes four strain signal multiplexing and conditioning units.

4. The strain measurement channel time-division multiplexing device supporting multi-model testing according to claim 3, characterized in that, The strain signal input interface of the same group of strain signal multiplexing conditioning units is 4.

5. The strain measurement channel time-division multiplexing device supporting multi-model testing according to claim 1, characterized in that, Each strain signal input interface corresponds to 16 strain measurement channels.

6. The strain measurement channel time-division multiplexing device supporting multi-model testing according to claim 1, characterized in that, A strain measurement channel time-division multiplexing device supporting multi-model testing is used in a three-wire strain testing system. The multiplexing conditioning board is a three-wire multiplexing switching conditioning board. The three wires of the multiplexing conditioning board are connected to the three transmission cables from the strain gauge to the strain acquisition instrument. The three transmission cables transmit the excitation output signal, the excitation input signal, and the strain measurement signal, respectively. The multiplexing conditioning board achieves synchronous programmable switching of the three-wire strain signal by simulating a multiplexer, and controls the conduction and disconnection of the three transmission cables by inputting the control signal of the multiplexing conditioning board.

7. The strain measurement channel time-division multiplexing device supporting multi-model testing according to claim 1, characterized in that, The strain signal input interface is a 50-pin DB50 rectangular connector.

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