Multifunctional vibration data acquisition instrument

Abstract

The multifunctional vibration data acquisition instrument comprises a data acquisition sensor interface, a power supply module, a signal conditioning module, an analog-to-digital conversion module, a micro-control unit and a wireless transmission module, the data acquisition sensor interface is connected with the input end of the signal conditioning module, the output end of the signal conditioning module is connected with the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is connected with the input end of the micro-control unit. The output end of the micro-control unit is connected with the input end of the wireless transmission module; according to the invention, data acquisition of various signals of seismic oscillation, structural vibration, a cable force acceleration sensor and the like is supported at the same time, and adaptive anti-aliasing cut-off frequency selection can be carried out according to the sampling frequency.

Description

Technical Field

[0001] The present application relates to the technical field of data acquisition, and in particular to a multifunctional vibration data acquisition instrument. Background Art

[0002] Vibration data monitoring is required in bridges, buildings, transportation, wind turbines and other fields, and generally for medium and long-term measurements. Traditional vibration data collectors have a single function and a small number of channels. When the number of channels increases, there is a problem of high power consumption. Most of them have the disadvantages of single acquisition signal, low sampling frequency and inaccurate monitoring of dynamic small voltage signals of sensors. Especially in engineering application scenarios such as bridges and buildings, the collector must also meet the requirements of battery power supply and wireless data transmission, which puts high demands on the power consumption and data transmission of the collector. Utility Model Content

[0003] In order to solve the above problems, the embodiment of the present application provides a multifunctional vibration data collector, which supports data collection of multiple signals such as ground vibration, structural vibration and cable acceleration sensor, and can select the anti-aliasing cutoff frequency adaptively according to the sampling frequency. The technical solution is as follows:

[0004] The present application provides a multifunctional vibration data collector, comprising a data acquisition sensor interface, a power module, a signal conditioning module, an analog-to-digital conversion module, a microcontroller unit and a wireless transmission module; the data acquisition sensor interface is connected to the input end of the signal conditioning module, the output end of the signal conditioning module is connected to the input end of the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected to the input end of the microcontroller unit, and the output end of the microcontroller unit is connected to the input end of the wireless transmission module.

[0005] For example, in the multifunctional vibration data collector provided in one embodiment, the signal conditioning module includes an operational amplifier and a low-pass signal filtering circuit, and the signal with the DC component filtered out is amplified by the operational amplifier; and the signal is anti-aliased filtered by the low-pass signal filtering circuit.

[0006] For example, in the multifunctional vibration data collector provided in one embodiment, the analog signal entering the analog-to-digital conversion module through the signal conditioning module completes A / D signal conversion under the control of the microcontroller unit, converting the analog signal into binary data recognizable by the microcontroller unit and the computer.

[0007] For example, in the multifunctional vibration data collector provided in one embodiment, it also includes a data storage module and a communication module, the output end of the micro control unit is connected to the input end of the data storage module and the communication module, and the output end of the communication module is connected to the input end of the wireless transmission module.

[0008] For example, in the multifunctional vibration data collector provided in one embodiment, it also includes a data output interface, which is an RJ45 network interface. The output end of the communication module is connected to the data output interface and the wireless transmission module. The communication module packages the data according to the communication protocol format requirements and sends it to the RJ45 network interface and the wireless transmission module. The wireless transmission module sends the data to the set static IP and data port to complete the wireless transmission of the data.

[0009] For example, in the multifunctional vibration data collector provided in one embodiment, an expansion interface is also included, through which synchronous data collection between multiple multifunctional vibration data collectors is achieved.

[0010] For example, in the multifunctional vibration data collector provided in one embodiment, the data acquisition sensor interface is a 5-core DG381 connector with a total of 16 input channels.

[0011] For example, in the multifunctional vibration data collector provided in one embodiment, an LED operation indicator light is also included to display the operation status of the multifunctional vibration data collector.

[0012] The beneficial effects of a multifunctional vibration data collector provided by some embodiments of the present application are as follows:

[0013] 1. Multi-function: The data collector of this application supports data collection of multiple signals such as ground vibration, structural vibration, and cable acceleration sensor, and can select the adaptive anti-aliasing cutoff frequency according to the sampling frequency. It also has multiple collection modes such as automatic upload, response mode, and command mode. At the same time, wired / wireless transmission function can be selected to meet different signal transmission requirements.

[0014] 2. Multi-channel: A single data acquisition instrument in this application supports the acquisition of up to 16 channels of data.

[0015] 3. High sampling frequency: The maximum sampling frequency of the data collector in this application can reach up to 200Hz / CH, which meets most vibration data collection needs. Multiple data collectors can be cascaded through Gigabit Ethernet to achieve data collection of more channels.

[0016] 4. High synchronization: The data collector of the present application can realize synchronous data collection between channels and between multiple data collectors.

[0017] 5. Low power consumption. This application significantly reduces the power consumption of the data collector through circuit structure optimization and acquisition algorithm upgrade. It can be powered by batteries to meet the needs of different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is the principle diagram of the multifunctional vibration data collector of the present application;

[0020] Figure 2 is a power management circuit diagram of the present application;

[0021] Figure 3 is the A / D conversion circuit diagram of the present application;

[0022] Figure 4 It is a control circuit diagram of the micro control unit of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] The present application provides a multifunctional vibration data collector, such as Figure 1As shown, it includes a data acquisition sensor interface, a power module, a signal conditioning module, an analog-to-digital conversion module, a micro control unit and a wireless transmission module; the data acquisition sensor interface is connected to the input end of the signal conditioning module, the output end of the signal conditioning module is connected to the input end of the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected to the input end of the micro control unit, and the output end of the micro control unit is connected to the input end of the wireless transmission module.

[0026] Among them, the power supply module supplies power to the signal conditioning module, analog-to-digital conversion module, microcontroller unit and wireless transmission module. The signal conditioning module can select a suitable programmable amplification factor to amplify the signal according to the actual signal size. The analog-to-digital conversion module is responsible for converting the sensor voltage analog signal into a digital signal. The microcontroller unit (MCU) can control the acquisition timing and perform digital filtering on the signal quantity to eliminate useless components mixed in the signal, reduce random errors, and control the device to sleep according to the acquisition frequency and acquisition requirements to reduce power consumption; the wireless transmission module can send the monitoring data to the host computer in wireless form.

[0027] The multifunctional vibration data collector of this application supports data collection of multiple signals such as ground vibration, structural vibration and cable acceleration sensor, and can select the adaptive anti-aliasing cutoff frequency according to the sampling frequency. It also has multiple collection modes such as automatic upload, response mode, and command mode. At the same time, it can select wired / wireless transmission function to meet different signal transmission requirements. Figure 2 The figure shows the power management circuit of the collector of the present application. Through the optimization of the circuit structure and the upgrade of the collection algorithm, the power consumption of the collector is greatly reduced, and it can be powered by batteries to meet the needs of different scenarios.

[0028] For example, in the multifunctional vibration data collector provided in one embodiment, the signal conditioning module includes an operational amplifier and a low-pass signal filtering circuit, and the signal with the DC component filtered out is amplified by the operational amplifier; and the signal is anti-aliased filtered by the low-pass signal filtering circuit.

[0029] For example, in the multifunctional vibration data collector provided in one embodiment, Figure 3 The A / D conversion circuit of the data acquisition instrument of the present application is shown. The analog signal entering the analog-to-digital conversion module via the signal conditioning module completes the A / D signal conversion under the control of the microcontroller unit, and converts the analog signal into binary data recognizable by the microcontroller unit and the computer. According to the above embodiment, the input 8-channel analog voltage signal is synchronously sampled and converted into a digital signal through the A / D conversion circuit, and the converter adopts a 24-bit ∑-Δ analog-to-digital converter to obtain high-precision sampling data, which is conducive to the MCU to identify and process.

[0030] For example, in the multifunctional vibration data collector provided in one embodiment, it also includes a data storage module and a communication module, the output end of the micro control unit is connected to the input end of the data storage module and the communication module, and the output end of the communication module is connected to the input end of the wireless transmission module.

[0031] For example, in the multifunctional vibration data collector provided in one embodiment, it also includes a data output interface, which is an RJ45 network interface. The output end of the communication module is connected to the data output interface and the wireless transmission module. The communication module packages the data according to the communication protocol format requirements and sends it to the RJ45 network interface and the wireless transmission module. The wireless transmission module sends the data to the set static IP and data port to complete the wireless transmission of the data.

[0032] For example, in the multifunctional vibration data collector provided in one embodiment, an expansion interface is also included, through which the synchronous collection between multiple multifunctional vibration data collectors is realized. According to the above embodiment, the collector of the present application can realize synchronous collection between channels and between multiple collectors, and multiple data collectors can be cascaded through Gigabit Ethernet to realize data collection of more channels with high synchronization.

[0033] For example, in the multifunctional vibration data collector provided in one embodiment, the data acquisition sensor interface is a 5-core DG381 connector with a total of 16 input channels. According to the above embodiment, a single data collector supports up to 16 channels of data acquisition, realizing multi-channel vibration data acquisition.

[0034] For example, in the multifunctional vibration data collector provided in one embodiment, an LED operation indicator light is also included to display the operation status of the multifunctional vibration data collector.

[0035] The working principle of the multifunctional vibration data collector of this application is:

[0036] Step 1: After the input signal enters the signal conditioning module, it is first subjected to a high-pass signal frequency to filter out the DC component. The maximum sampling frequency of the collector of this application can reach up to 200Hz / CH, which meets the needs of most vibration data collection. Secondly, the signal with the DC component filtered out is sent to the operational amplifier for signal amplification; the amplified signal is then sent to the low-pass signal filter circuit for anti-aliasing filtering, and finally the vibration signal that meets the analog-to-digital conversion requirements is sent to the analog-to-digital conversion module for A / D conversion. The signal conditioning module is responsible for accessing the signal protection circuit, such as TVS and ESD, and at the same time performs program control of the power supply to the external sensor and selection of the amplification factor.

[0037] Step 2: The analog signal entering the analog-to-digital conversion module completes the A / D signal conversion under the control of the microcontroller unit MCU, converting the analog signal into binary data that can be recognized by the microcontroller unit MCU and the computer.

[0038] Step 3: The microcontroller unit MCU reads the data after A / D conversion in time sequence, identifies, analyzes, filters and calculates the data, and sends it to the data storage module and communication module. Figure 4 Shown is the microcontroller unit (MCU) control circuit.

[0039] Step 4: The communication module packages the data and sends it to the RJ45 network interface and the wireless transmission module according to the communication protocol format requirements. The wireless transmission module sends the data to the set static IP and data port to complete the wireless transmission of the data.

[0040] Although the implementation scheme of the present application has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes, and it can be fully applicable to various fields suitable for the present application. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present application is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A multifunctional vibration data collector, characterized in that: include: Data acquisition sensor interface, power module, signal conditioning module, analog-to-digital conversion module, microcontroller unit and wireless transmission module; The data acquisition sensor interface is connected to the input end of the signal conditioning module, the output end of the signal conditioning module is connected to the input end of the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected to the input end of the micro control unit, and the output end of the micro control unit is connected to the input end of the wireless transmission module.

2. The multifunctional vibration data collector according to claim 1, characterized in that: The signal conditioning module includes an operational amplifier and a low-pass signal filtering circuit. The signal with the DC component filtered out is amplified by the operational amplifier; and the signal is anti-aliased filtered by the low-pass signal filtering circuit.

3. The multifunctional vibration data collector according to claim 2, characterized in that: The analog signal entering the analog-to-digital conversion module via the signal conditioning module completes A / D signal conversion under the control of the microcontroller unit, converting the analog signal into binary data recognizable by the microcontroller unit and the computer.

4. The multifunctional vibration data collector according to claim 1, characterized in that: It also includes a data storage module and a communication module. The output end of the micro control unit is connected to the data storage module and the input end of the communication module, and the output end of the communication module is connected to the input end of the wireless transmission module.

5. The multifunctional vibration data collector according to claim 4, characterized in that: It also includes a data output interface, which is an RJ45 network interface. The output end of the communication module is connected to the data output interface and the wireless transmission module. The communication module packages the data and sends it to the RJ45 network interface and the wireless transmission module according to the communication protocol format requirements. The wireless transmission module sends the data to the set static IP and data port to complete the wireless transmission of the data.

6. The multifunctional vibration data collector according to claim 1, characterized in that: It also includes an expansion interface, through which synchronous collection between multiple multifunctional vibration data collectors is achieved.

7. The multifunctional vibration data collector according to claim 1, characterized in that: The data acquisition sensor interface is a 5-core DG381 connector with a total of 16 input channels.

8. The multifunctional vibration data collector according to claim 5, characterized in that: It also includes an LED operating indicator light for displaying the operating status of the multifunctional vibration data collector.

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