CN220380609U - Vibration signal acquisition circuit and HUMS system - Google Patents
Vibration signal acquisition circuit and HUMS system Download PDFInfo
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- CN220380609U CN220380609U CN202322056416.2U CN202322056416U CN220380609U CN 220380609 U CN220380609 U CN 220380609U CN 202322056416 U CN202322056416 U CN 202322056416U CN 220380609 U CN220380609 U CN 220380609U
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Abstract
The utility model discloses a vibration signal acquisition circuit and a HUMS system, wherein the acquisition circuit comprises an EMI filter circuit, a constant current source power supply circuit, a direct current blocking circuit, an attenuation circuit, a gain variable amplifying circuit, a filter shaping circuit, a single-ended differential circuit and an ADC circuit; the EMI filter circuit is used for being connected with the vibration sensor, the output end of the EMI filter circuit and the output end of the constant current source power supply circuit are connected with the blocking circuit, the output end of the blocking circuit is connected with the attenuation circuit, the output end of the attenuation circuit is connected with the input end of the gain variable amplifying circuit, the output end of the gain variable amplifying circuit is connected with the input end of the filter shaping circuit, the output end of the filter shaping circuit is connected with the input end of the single-ended rotating differential circuit, and the output end of the single-ended rotating differential circuit is connected with the input end of the ADC circuit. The circuit supports adjustment of gain multiples of the collected vibration signals, and can be compatible with various vibration sensor models. The utility model can be widely applied to the technical field of circuits.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a vibration signal acquisition circuit and a HUMS system.
Background
HUMS (Health and Usage Monitoring System), i.e. integrity and usage monitoring system, is an avionics device for monitoring and diagnosing the operational status of mechanical, electrical and structural systems of an aircraft. The HUMS system monitors and diagnoses the status of the aircraft by measuring and analyzing various parameters of the aircraft, such as vibration, temperature, pressure, etc., in order to predict and diagnose faults in advance and take appropriate repair and maintenance actions. The HUMS system can help aircraft maintenance personnel to better manage the health condition of the aircraft, prolong the service life of the aircraft, and improve the reliability and safety of the aircraft. The HUMS system is widely used not only in the aviation field but also in other industrial fields such as offshore drilling, manufacturing, etc. to monitor and diagnose the health status of mechanical equipment.
In the related art, the types of vibration sensors used in the HUMS system are often various, the electrical characteristics of output signals of the vibration sensors of different manufacturers and different models are greatly different, the magnitude of the output amplitude signal is different from tens of millivolts to tens of volts, the acquisition circuit of the vibration signals in the system is often fixed in gain, when the vibration sensors in butt joint are required to be replaced, the corresponding vibration signal acquisition circuit is often replaced, the implementation cost is higher, the compatibility of the system is poor, and the application range is narrower.
In view of the above, there is a need to solve the problems in the related art.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the related art to a certain extent.
In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the utility model comprises the following steps:
the embodiment of the utility model provides a vibration signal acquisition circuit, which comprises:
the device comprises an EMI filter circuit, a constant current source power supply circuit, a blocking circuit, an attenuation circuit, a gain variable amplifying circuit, a filter shaping circuit, a single-ended slip differential circuit and an ADC circuit;
the input end of the EMI filter circuit is used for being connected with the vibration sensor, the output end of the EMI filter circuit and the output end of the constant current source power supply circuit are connected with the input end of the blocking circuit, the output end of the blocking circuit is connected with the input end of the attenuation circuit, the output end of the attenuation circuit is connected with the input end of the gain variable amplifying circuit, the output end of the gain variable amplifying circuit is connected with the input end of the filter shaping circuit, the output end of the filter shaping circuit is connected with the input end of the single-end-to-differential circuit, and the output end of the single-end-to-differential circuit is connected with the input end of the ADC circuit.
In addition, the vibration signal acquisition circuit according to the above embodiment of the present utility model may further have the following additional technical features:
further, in one embodiment of the present utility model, the EMI filter circuit includes a common mode filter circuit and an electrostatic protection circuit.
Further, in one embodiment of the present utility model, the gain variable amplifying circuit includes an operational amplifier chip, a multi-channel analog switch chip, and a plurality of resistors;
the multichannel analog switch chip comprises a plurality of switch components, wherein the number of the switch components is the same as that of the resistors; each of the switch assemblies includes a first connection point connected to a first pin of the operational amplifier chip through the resistor and a second connection point connected to an eighth pin of the operational amplifier chip.
Further, in an embodiment of the present utility model, the multi-channel analog switch chip is a MAX365 chip.
Further, in an embodiment of the present utility model, the single-to-differential circuit includes an AD8138 chip or an ADA4940 chip.
The embodiment of the utility model also provides a HUMS system, which comprises:
the vibration signal acquisition circuit comprises a vibration sensor, a processor, an alarm and the vibration signal acquisition circuit;
the vibration sensor is connected to the input end of the processor through the vibration signal acquisition circuit, and the output end of the processor is connected to the alarm.
Further, in an embodiment of the present utility model, the processor includes an STC12 series single-chip microcomputer chip or an STM32 series single-chip microcomputer chip.
Further, in an embodiment of the present utility model, the alarm includes a buzzer or an LED light.
Further, in one embodiment of the present utility model, the HUMS system further comprises an azimuth sensor and a rotor track sensor.
The advantages and benefits of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
The embodiment of the application discloses a vibration signal acquisition circuit, includes: the device comprises an EMI filter circuit, a constant current source power supply circuit, a blocking circuit, an attenuation circuit, a gain variable amplifying circuit, a filter shaping circuit, a single-ended slip differential circuit and an ADC circuit; the input end of the EMI filter circuit is used for being connected with the vibration sensor, the output end of the EMI filter circuit and the output end of the constant current source power supply circuit are connected with the input end of the blocking circuit, the output end of the blocking circuit is connected with the input end of the attenuation circuit, the output end of the attenuation circuit is connected with the input end of the gain variable amplifying circuit, the output end of the gain variable amplifying circuit is connected with the input end of the filter shaping circuit, the output end of the filter shaping circuit is connected with the input end of the single-end-to-differential circuit, and the output end of the single-end-to-differential circuit is connected with the input end of the ADC circuit. The gain variable amplifying circuit is used in the acquisition circuit, can support adjustment of gain multiple of the acquired vibration signals, can be compatible with various vibration sensor types, does not need to replace the corresponding vibration signal acquisition circuit in the process of iterative optimization and sensor upgrading of the system, has good adaptability, and is beneficial to reducing the realization cost of the HUMS system.
Drawings
Fig. 1 is a schematic structural diagram of a vibration signal acquisition circuit provided by the utility model;
fig. 2 is a schematic circuit diagram of a constant current source power supply circuit provided by the utility model;
fig. 3 is a schematic circuit diagram of an EMI filter circuit according to the present utility model;
fig. 4 is a schematic circuit diagram of a gain variable amplifying circuit according to the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "length," "upper," "lower," "front," "rear," "left," "right," "top," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
HUMS (Health and Usage Monitoring System), i.e. integrity and usage monitoring system, is an avionics device for monitoring and diagnosing the operational status of mechanical, electrical and structural systems of an aircraft. The HUMS system monitors and diagnoses the status of the aircraft by measuring and analyzing various parameters of the aircraft, such as vibration, temperature, pressure, etc., in order to predict and diagnose faults in advance and take appropriate repair and maintenance actions. The HUMS system can help aircraft maintenance personnel to better manage the health condition of the aircraft, prolong the service life of the aircraft, and improve the reliability and safety of the aircraft. The HUMS system is widely used not only in the aviation field but also in other industrial fields such as offshore drilling, manufacturing, etc. to monitor and diagnose the health status of mechanical equipment.
In the related art, the types of vibration sensors used in the HUMS system are often various, the electrical characteristics of output signals of the vibration sensors of different manufacturers and different models are greatly different, the magnitude of the output amplitude signal is different from tens of millivolts to tens of volts, the acquisition circuit of the vibration signals in the system is often fixed in gain, when the vibration sensors in butt joint are required to be replaced, the corresponding vibration signal acquisition circuit is often replaced, the implementation cost is higher, the compatibility of the system is poor, and the application range is narrower.
In view of this, in the embodiment of the present application, a vibration signal acquisition circuit is provided, and a gain variable amplifying circuit is used in the acquisition circuit, so that the gain multiple of an acquired vibration signal can be supported and adjusted, and the vibration signal acquisition circuit can be compatible with various vibration sensor types, does not need to replace the corresponding vibration signal acquisition circuit in the process of iterative optimization and sensor upgrading of a system, has good adaptability, and is beneficial to reducing the implementation cost of a HUMS system.
Specifically, referring to fig. 1, in an embodiment of the present application, a vibration signal acquisition circuit is provided, including:
the device comprises an EMI filter circuit, a constant current source power supply circuit, a blocking circuit, an attenuation circuit, a gain variable amplifying circuit, a filter shaping circuit, a single-ended slip differential circuit and an ADC circuit;
the input end of the EMI filter circuit is used for being connected with the vibration sensor, the output end of the EMI filter circuit and the output end of the constant current source power supply circuit are connected with the input end of the blocking circuit, the output end of the blocking circuit is connected with the input end of the attenuation circuit, the output end of the attenuation circuit is connected with the input end of the gain variable amplifying circuit, the output end of the gain variable amplifying circuit is connected with the input end of the filter shaping circuit, the output end of the filter shaping circuit is connected with the input end of the single-end-to-differential circuit, and the output end of the single-end-to-differential circuit is connected with the input end of the ADC circuit.
In this embodiment of the present application, a vibration signal acquisition circuit is provided, where the circuit includes an EMI filter circuit, a constant current source power supply circuit, a dc blocking circuit, an attenuation circuit, a gain variable amplifying circuit, a filter shaping circuit, a single-ended-to-differential circuit, and an ADC circuit, where connection relationships of the circuits are shown in fig. 1. Specifically, in the vibration signal acquisition circuit, the EMI filter circuit is used for inhibiting electromagnetic interference in the vibration sensor acquisition signal, and can comprise components such as a capacitor, an inductor, a filter and the like, and high-frequency noise and clutter interference can be removed by filtering an input signal, so that the quality of the acquired vibration signal is ensured.
Referring to fig. 2, the constant current source power supply circuit is used for providing a constant current source for the dc blocking circuit, has the characteristics of stable voltage and constant current, and can ensure the normal operation of the dc blocking circuit.
The dc blocking circuit is used for removing the dc component of the input signal, such as the dc bias of the vibration signal and the external dc interference signal, and only the ac component is reserved. The device can comprise components such as a capacitor, a resistor, a diode and the like, and can change an input signal into a pure alternating current signal through half-wave rectification, filtering and other operations, so that the subsequent processing and amplification are convenient.
The attenuation circuit is used for attenuating the input signal to avoid overload and distortion of the amplifying circuit, and can comprise a resistor, a capacitor and the like, and the attenuation of the signal is realized by adjusting the size of the resistance-capacitance element.
The gain variable amplifying circuit is used for amplifying an input signal so as to better detect and diagnose the vibration signal, and particularly, the gain multiple of the amplifying circuit in the embodiment of the application can be adjusted, specifically, the amplification multiple can be adjusted by adjusting the resistance or the capacitance of the connected operational amplifier.
The filtering and shaping circuit is used for filtering and shaping the amplified signal so as to remove noise and interference, so that the signal is clearer and more accurate, and the quality and stability of the signal can be improved through filtering, shaping and other operations.
The single-ended to differential circuit is used for converting a single-ended signal into a differential signal so as to better inhibit common mode interference and improve the quality of the signal, and can comprise components such as an operational amplifier, a resistor, a capacitor and the like, and the single-ended signal is converted into the differential signal through differential amplification, filtering and the like. In some embodiments, the single-ended-to-differential circuit may include an AD8138 chip or an ADA4940 chip.
The ADC circuit is configured to convert an analog signal into a digital signal for digital processing and analysis, and may include an analog-to-digital converter, a clock, a power supply, and the like, and convert the analog signal into the digital signal through sampling, quantization, and the like, and output the digital signal to a subsequent processing system. It will be appreciated that the above-mentioned circuit has a specific implementation circuit in the related art, and in the embodiment of the present application, the structure of the circuit is not particularly limited, and it may be implemented with reference to the prior art.
Referring to fig. 3, in some embodiments, the EMI filter circuit includes a common mode filter circuit and an electrostatic protection circuit, where in the embodiments of the present application, the common mode filter circuit is an important component of the EMI filter circuit, and is used to suppress common mode interference in an input signal, and filter and remove the common mode signal, so as to reduce the influence of the common mode interference on signal acquisition, and improve the quality and reliability of the signal. The electrostatic protection circuit is used for protecting the circuit from electrostatic discharge, and the electrostatic protection circuit guides the electrostatic discharge current inside the circuit to the ground through guiding the electrostatic discharge current to protect the safety and stability of the circuit. The common mode filter circuit and the electrostatic protection circuit process and protect the input signals in different modes, so that the quality and reliability of the input signals are ensured. In practical application, the EMI filter circuit not only can improve the accuracy and reliability of signal acquisition, but also can protect the circuit from noise and interference.
In some embodiments, the gain variable amplifying circuit includes an operational amplifier chip, a multi-channel analog switch chip, and a plurality of resistors;
the multichannel analog switch chip comprises a plurality of switch components, wherein the number of the switch components is the same as that of the resistors; each of the switch assemblies includes a first connection point connected to a first pin of the operational amplifier chip through the resistor and a second connection point connected to an eighth pin of the operational amplifier chip.
In this embodiment of the present application, the gain variable amplifying circuit may include an operational amplifier chip, a multichannel analog switch chip and a plurality of resistors, where the operational amplifier chip may amplify a signal, and the multichannel analog switch chip and the resistors may be used to adjust an amplification factor of the signal. Specifically, referring to fig. 4, a MAX365 chip may be selected as the multi-channel analog switch chip, which includes a plurality of switch components, where each switch component corresponds to one resistor, such as a switch S1, a switch S2, a switch S3, and a switch S4, corresponding to four resistors, and the multi-channel analog switch chip may gate one or more switches corresponding to the resistors, so that resistance values of resistors connected to the operational amplifier chip are different, and amplification factors may also have various choices.
In the embodiment of the application, there is also provided a HUMS system, which includes a vibration sensor, a processor, an alarm, and the vibration signal acquisition circuit in the foregoing embodiment; the vibration sensor is connected to the input end of the processor through the vibration signal acquisition circuit, and the output end of the processor is connected to the alarm.
In this application embodiment, provide a HUMS system, can realize the monitoring warning to the equipment vibration condition. Specifically, the system comprises a vibration sensor which is arranged on the monitored equipment and used for detecting corresponding vibration signals, the vibration signal acquisition circuit is used for processing the vibration signals and transmitting the vibration signals to the processor, and then the processor can control the alarm device to alarm according to the condition of the vibration signals.
In this embodiment of the present application, the processor may be configured by any one or more processor chips including an MCU single-chip microcomputer, FPGA, CPLD, DSP, ARM, etc., for example, the MCU single-chip microcomputer may be set as an STC12 series single-chip microcomputer chip or an STM32 series single-chip microcomputer chip. Of course, the specific chip selection may be flexibly adjusted according to the needs, which is not limited in the embodiment of the present application.
In this embodiment, the alarm may include a buzzer or an LED lamp. In the processor, a comparator can be provided, the comparator is provided with a corresponding voltage or current threshold, and the acquired and processed vibration signal can be compared with the threshold of the comparator, so that the processor triggers the action of the alarm. The processor can control the alarm based on the power on-off of the processor, for example, the power on of the alarm can be controlled by an electronic switch to realize the alarm operation, and the specific circuit structure of the processor is not limited.
In embodiments of the present application, the HUMS system may also include azimuth angle sensors and rotor track sensors, which may be used to enable vibration condition monitoring of helicopter equipment.
In the description of the present specification, reference to the term "one embodiment," "another embodiment," or "certain embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A vibration signal acquisition circuit, comprising:
the device comprises an EMI filter circuit, a constant current source power supply circuit, a blocking circuit, an attenuation circuit, a gain variable amplifying circuit, a filter shaping circuit, a single-ended slip differential circuit and an ADC circuit;
the input end of the EMI filter circuit is used for being connected with the vibration sensor, the output end of the EMI filter circuit and the output end of the constant current source power supply circuit are connected with the input end of the blocking circuit, the output end of the blocking circuit is connected with the input end of the attenuation circuit, the output end of the attenuation circuit is connected with the input end of the gain variable amplifying circuit, the output end of the gain variable amplifying circuit is connected with the input end of the filter shaping circuit, the output end of the filter shaping circuit is connected with the input end of the single-end-to-differential circuit, and the output end of the single-end-to-differential circuit is connected with the input end of the ADC circuit.
2. The vibration signal acquisition circuit of claim 1, wherein: the EMI filter circuit includes a common mode filter circuit and an electrostatic protection circuit.
3. The vibration signal acquisition circuit of claim 1, wherein: the gain variable amplifying circuit comprises an operational amplifier chip, a multichannel analog switch chip and a plurality of resistors;
the multichannel analog switch chip comprises a plurality of switch components, wherein the number of the switch components is the same as that of the resistors; each of the switch assemblies includes a first connection point connected to a first pin of the operational amplifier chip through the resistor and a second connection point connected to an eighth pin of the operational amplifier chip.
4. A vibration signal acquisition circuit according to claim 3, wherein: the multichannel analog switch chip is a MAX365 chip.
5. The vibration signal acquisition circuit of claim 1, wherein: the single-end-to-differential circuit comprises an AD8138 chip or an ADA4940 chip.
6. A HUMS system comprising:
a vibration sensor, a processor, an alarm and a vibration signal acquisition circuit as claimed in any one of claims 1 to 5;
the vibration sensor is connected to the input end of the processor through the vibration signal acquisition circuit, and the output end of the processor is connected to the alarm.
7. The HUMS system of claim 6, wherein: the processor comprises STC12 series singlechip chips or STM32 series singlechip chips.
8. The HUMS system of claim 6, wherein: the alarm comprises a buzzer or an LED lamp.
9. The HUMS system of claim 6, wherein: the HUMS system also includes azimuth angle sensors and rotor track sensors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322056416.2U CN220380609U (en) | 2023-08-01 | 2023-08-01 | Vibration signal acquisition circuit and HUMS system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322056416.2U CN220380609U (en) | 2023-08-01 | 2023-08-01 | Vibration signal acquisition circuit and HUMS system |
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| CN220380609U true CN220380609U (en) | 2024-01-23 |
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