Agile aircraft initiating explosive device online adaptive health detection system and detection method

Abstract

The invention relates to an on-line self-adaptive health detection system and method for initiating explosive devices of an agile aircraft, and belongs to the technical field of on-line detection of spaceflight electronic systems. Comprising a constant current source, an integrated computing power center, a reusable detection link and an ignition loop, wherein the integrated computing power center comprises a sequential logic control algorithm module and a data estimation module; the reusable detection link comprises an analog switch 1, an isolation optocoupler, a multi-choice analog switch, a voltage following module, an isolation operational amplifier module, a differential operational amplifier module and an AD acquisition module; the ignition loop comprises an initiating explosive device to be detected; according to the invention, the problems of poor precision, complex hardware, low test efficiency and the like of a traditional single-path voltage measurement method are solved, and the test coverage, safety and application reliability of the agile aircraft are improved.

Description

Technical Field

[0001] This invention belongs to the field of online testing technology for aerospace electronic systems, and relates to an online adaptive health monitoring system and method for pyrotechnic components of agile aircraft. Background Technology

[0002] The testing of pyrotechnic components for agile aircraft is an important part of the regular testing and maintenance of aircraft. The purpose is to measure the resistance and insulation of pyrotechnic components that were not measured during the comprehensive testing of agile aircraft, so as to determine the effectiveness of the pyrotechnic components and the correctness of the related cable connections, thereby ensuring the ignition quality of the pyrotechnic components.

[0003] Currently, the testing equipment used in the testing of pyrotechnic components for agile aircraft mainly includes manual or semi-automatic testing equipment such as electric detonator testers and specialized testers. These testing devices suffer from long testing times and low accuracy, thus failing to eliminate the impact of measurement channel system errors and parameter drift on measurement accuracy, and lack versatility and flexibility. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose an online adaptive health detection system and method for pyrotechnic components of agile aircraft. This solves the problems of poor accuracy, complex hardware, and low testing efficiency of traditional single-channel voltage measurement methods, thereby improving the testing coverage, safety, and application reliability of agile aircraft.

[0005] The solution of the present invention is: The agile aircraft pyrotechnics online adaptive health monitoring system includes a constant current source, an integrated computing center, a reusable detection link, and an ignition circuit. The integrated computing center includes a timing logic control algorithm module and a data estimation module. The reusable detection link includes an analog switch 1, an isolation optocoupler, a multi-select analog switch, a voltage follower module, an isolation operational amplifier module, a differential operational amplifier module, and an AD acquisition module. The ignition circuit includes the pyrotechnics to be tested. The timing logic control algorithm module receives pyrotechnic detection commands from an external ground testing system; controls analog switch 1 to connect with a constant current source, enabling the constant current source to power the reusable detection link; and controls the pyrotechnic to be tested to connect to the constant current source and the isolation optocoupler according to the pyrotechnic detection command. Constant current source: Powers the reusable detection link; provides a constant, weak current to the pyrotechnic device under test; The pyrotechnic device under test receives a constant, weak current from a constant current source to generate voltage; Multiple-select analog switch: Selects the corresponding ignition channel through an isolation optocoupler to acquire the voltage value of the pyrotechnic device under test; after acquiring the voltage value of one ignition channel, it connects the next ignition channel to re-acquire the data until the voltage values ​​of the pyrotechnic devices under test for all channels are acquired; and transmits the voltage values ​​of the pyrotechnic devices under test for all channels sequentially through the voltage follower module, the isolation operational amplifier module, the differential operational amplifier module, and the AD acquisition module to the data estimation module. Data estimation module: Receives the voltage values ​​of the pyrotechnic devices under test from all channels, performs adaptive compensation processing, and realizes adaptive online health detection of multiple pyrotechnic devices.

[0006] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the constant current source includes a reference voltage source, a negative feedback network, an adjustable reference resistor R, and an anti-backflow diode; The reference voltage source adopts a voltage reference source with an output voltage accuracy of ±0.4%; the negative feedback network includes an isolation operational amplifier, as well as resistors and capacitors, which can increase or decrease the resistance value to adjust the current value output by the constant current source and achieve constant current output; the adjustable reference resistor R adopts a resistor with a deviation of ±0.1%; the adjustable constant current source is protected by an anti-backflow diode to prevent ignition voltage backflow.

[0007] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the constant current source has a constant current range of 10-80mA.

[0008] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the isolation optocoupler is controlled by a timing logic control algorithm module. The default state of the isolation optocoupler is disconnected. When the pyrotechnic to be tested is being tested, the isolation optocoupler and the pyrotechnic to be tested are in a connected state. When the pyrotechnic to be tested is in the ignition state, the isolation optocoupler is in a disconnected state. This avoids damage to the reusable detection link caused by high voltage during the ignition state of the pyrotechnic to be tested.

[0009] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the voltage follower module isolates the multi-select analog switch from the isolation operational amplifier module, thereby improving the input voltage quality of the isolation operational amplifier module.

[0010] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the isolation operational amplifier module amplifies the acquired voltage signal for easy acquisition by the AD acquisition module, and isolates the acquisition ground wire from the ignition ground wire.

[0011] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the differential operational amplifier module inputs the collected voltage signal into the AD acquisition module in the form of a differential signal, reducing interference on the line and improving accuracy.

[0012] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the AD acquisition module converts the acquired voltage signal from analog to digital.

[0013] In the aforementioned agile aircraft pyrotechnics online adaptive health monitoring system, the data estimation module performs Kalman filtering on the acquired voltage signal, adaptively compensates for the measurement results, corrects line errors and acquisition errors, reduces background noise interference, improves measurement accuracy, and completes the online detection of the pyrotechnics' condition.

[0014] The detection method of the above-mentioned agile aircraft pyrotechnics online adaptive health monitoring system includes: S1. Measure all ignition paths to obtain the corresponding voltage data V. j It performs data acquisition, filtering, and storage; S2. The Kalman filter method is used to filter and estimate the collected voltage values, estimate the error value, and complete the online correction of the collected voltage value data to obtain the corrected voltage value.

[0015] The advantages of this invention compared to the prior art are: (1) This invention utilizes the computing power resources of the existing aerospace electronic system centralized computing center and the highly integrated self-testing link to complete online rapid health monitoring of up to 20 or more pyrotechnics; it solves the problems of complex hardware and low testing efficiency under the traditional single-channel voltage measurement method, and improves the test coverage, safety and application reliability of aerospace vehicles; (2) This invention solves the problem of poor accuracy under the traditional single-channel voltage measurement method by using the Kalman data estimation method, and improves the measurement accuracy of pyrotechnic products; (3) Based on the time-division multiplexing design concept, this invention is based on the aerospace electronic system of agile aircraft at the hardware level: the computing power resources of the centralized computing center, the introduction of a reusable detection circuit of constant current source, and the use of timing logic to control the on and off of analog switches to form a small-volume agile aircraft multi-channel pyrotechnic health detection system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the online adaptive health monitoring system for pyrotechnic components of the agile aircraft of the present invention; Figure 2 This is a flowchart of the timing logic control algorithm of the present invention; Figure 3 This is a flowchart of the Kalman filter process of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] This invention provides an online adaptive health monitoring system and method for pyrotechnic components of agile aircraft, which solves the problems of poor accuracy, complex hardware, and low testing efficiency of traditional single-channel voltage measurement methods, and improves the testing coverage, safety, and application reliability of agile aircraft.

[0019] This invention optimizes traditional multi-channel pyrotechnic health monitoring methods for agile aircraft. Based on the time-division multiplexing design principle, at the hardware level, it leverages the aerospace electronic system of the agile aircraft: utilizing the computing resources of a centralized computing center, it introduces a reusable detection circuit with a constant current source. By employing timing logic to control the on / off switching of analog switches, a compact multi-channel pyrotechnic health monitoring system for agile aircraft is constructed. Simultaneously, a Kalman filter online data estimation method is used to adaptively compensate the data collected by the detection circuit, forming a complete online adaptive health monitoring method for multi-channel pyrotechnics. In practical applications, the number of pyrotechnics that can be detected can be adjusted according to actual usage requirements, ensuring the flexibility and practicality of this monitoring method.

[0020] Agile aircraft pyrotechnics online adaptive health monitoring system, such as Figure 1 As shown, it specifically includes a constant current source, an integrated computing center, a reusable detection link, and an ignition circuit; wherein, the integrated computing center includes a timing logic control algorithm module and a data estimation module; the reusable detection link includes an analog switch 1, an isolation optocoupler, a multi-select analog switch, a voltage follower module, an isolation operational amplifier module, a differential operational amplifier module, and an AD acquisition module; the ignition circuit includes the pyrotechnic device to be tested.

[0021] The timing logic control algorithm module receives pyrotechnic detection commands from an external ground testing system; controls analog switch 1 to connect with a constant current source, enabling the constant current source to power the reusable detection link; and controls the pyrotechnic to be tested to connect to the constant current source and the isolation optocoupler according to the pyrotechnic detection command.

[0022] Constant current source: Powers the reusable detection link; provides a constant, weak current to the pyrotechnic device under test.

[0023] The pyrotechnic device under test receives a constant, weak current from a constant current source to generate a voltage.

[0024] Multiple-select analog switch: Selects the corresponding ignition channel through an isolation optocoupler to collect the voltage value of the pyrotechnic device under test; after collecting the voltage value of one ignition channel, the next ignition channel is connected to start data acquisition again, until the voltage values ​​of the pyrotechnic devices under test for all channels are collected; and the voltage values ​​of the pyrotechnic devices under test for all channels are transmitted sequentially to the data estimation module through the voltage follower module, the isolation operational amplifier module, the differential operational amplifier module, and the AD acquisition module.

[0025] Data estimation module: Receives the voltage values ​​of the pyrotechnic devices under test from all channels, performs adaptive compensation processing, and realizes adaptive online health detection of multiple pyrotechnic devices.

[0026] The constant current source includes a reference voltage source, a negative feedback network, an adjustable reference resistor R, and a reverse current protection diode. The reference voltage source uses a voltage reference with an output voltage accuracy of ±0.4%. The negative feedback network includes an isolation operational amplifier, resistors, and capacitors; by increasing or decreasing the resistance value, the output current value of the constant current source is adjusted to achieve a constant current output. The adjustable reference resistor R has a deviation of ±0.1%. The reverse current protection diode protects the adjustable constant current source from ignition voltage reverse current. The constant current range of the constant current source is 10-80mA.

[0027] The isolation optocoupler of the present invention is controlled by a timing logic control algorithm module to control its on / off state; the default state of the isolation optocoupler is the off state; when the pyrotechnic device to be tested is being tested, the isolation optocoupler and the pyrotechnic device to be tested are in a connected state; when the pyrotechnic device to be tested is in an ignition state, the isolation optocoupler is in an off state; thus avoiding damage to the reusable detection link caused by high voltage during the ignition state of the pyrotechnic device to be tested.

[0028] In the reusable detection chain, the functions of each module are as follows: The voltage follower module isolates the multi-select analog switch from the isolation operational amplifier module, improving the input voltage quality of the isolation operational amplifier module. The isolation operational amplifier module amplifies the acquired voltage signal for easier acquisition by the AD acquisition module and isolates the acquisition ground from the ignition ground. The differential operational amplifier module inputs the acquired voltage signal into the AD acquisition module as a differential signal, reducing line interference and improving accuracy. The AD acquisition module converts the acquired voltage signal from analog to digital.

[0029] The data estimation module performs Kalman filtering on the acquired voltage signal, adaptively compensates for the measurement results, corrects line errors and acquisition errors, reduces background noise interference, improves measurement accuracy, and completes the online detection of the condition of pyrotechnic items.

[0030] like Figure 3 As shown, the detection data obtained from multiple measurements based on a reusable detection link using a constant current source are subjected to Kalman filtering, which automatically compensates for the measurement results, corrects line errors and acquisition errors, reduces background noise interference, thereby reducing system errors and measurement errors, improving measurement accuracy, and completing the online detection of the condition of pyrotechnic items.

[0031] The detection method based on the online adaptive health monitoring system for pyrotechnics from agile aircraft includes the following steps: S1. Measure all ignition paths to obtain the corresponding voltage data V. jIt performs data acquisition, filtering, and storage.

[0032] S2. The Kalman filter method is used to filter and estimate the collected voltage values, estimate the error value, and complete the online correction of the collected voltage value data to obtain the corrected voltage value.

[0033] The state equations can be derived from Ohm's law:

[0034] in, For the measurement matrix, The current of the constant current source; The collected voltage data; This represents the estimated test system error value corresponding to the test system. The corrected voltage value is obtained by predicting the error variance matrix using the system disturbance covariance matrix and the measurement covariance matrix, and then comparing the estimated value with the measured value to complete the online correction of the measurement parameters.

[0035] Online adaptive health monitoring method for pyrotechnic components of agile aircraft, such as Figure 2 As shown, it includes the following steps: The ground testing system sends a pyrotechnic testing command to the integrated computing center. According to the pyrotechnic testing command, the integrated computing center first turns on analog switch 1 to connect the constant current source to the reusable testing link; then turns on the isolation optocoupler; and selects a channel by switching the multi-select analog switch to perform resistance testing on a certain pyrotechnic to be tested. This step is repeated until the resistance of all pyrotechnics to be tested is tested multiple times.

[0036] The online adaptive health detection system of this application is integrated into the pyrotechnic device under test. It does not require manual measurement or semi-automatic testing. It only requires sending a pyrotechnic device detection command to the integrated computing center. The integrated computing center controls the connection between the constant current source and the reusable detection link according to the pyrotechnic device detection command, and detects all the pyrotechnic devices under test and automatically processes the detection results.

[0037] This invention consists of two parts: a reusable detection link based on a constant current source and an online data estimation and diagnosis based on Kalman filtering. The reusable detection link based on a constant current source comprises three parts: an adjustable constant current source, a reusable detection link, and a timing logic control algorithm. The operation of this reusable detection link is as follows: ground equipment issues a pyrotechnic health detection command; the integrated computing center controls an analog switch to connect to the constant current source and the corresponding detection channel according to the timing logic control algorithm; the AD acquisition module completes the acquisition of pyrotechnic detection data for this channel and feeds the test data back to the integrated computing center, thus completing the entire pyrotechnic health status measurement process.

[0038] The constant current source uses a 2.5V high-precision voltage reference as the voltage source, introduces a negative feedback circuit, adjusts the external constant current value based on a high-precision current-limiting resistor, and controls the on / off of the analog switch through a timing logic control algorithm to realize the constant current source connecting to the ignition circuit of pyrotechnics. In addition, by adding a high-power diode between the constant current source and the ignition circuit, backflow is prevented and the constant current source is protected, thus providing an adjustable constant current value and a constant current source that can selectively connect to the ignition circuit.

[0039] A reusable detection channel refers to a system that provides mA-level detection current from a constant current source, which passes sequentially through a MOSFET controlling the on / off state of the ignition circuit, a current-limiting resistor, and a pyrotechnic device before being grounded. By acquiring the voltage value across the pyrotechnic device, its resistance can be measured using Ohm's law. To protect the detection circuit, an isolation optocoupler is introduced between the voltage acquisition circuit and the ignition circuit. To minimize size, a multi-channel analog switch based on an integrated computing center controls the switching of the ignition circuit, sequentially connecting the ignition circuits to be measured to the voltage acquisition circuit, achieving the goal of detecting the resistance values ​​of multiple pyrotechnic devices with a single voltage acquisition circuit. Furthermore, to ensure measurement accuracy, the measured voltage value is amplified by a voltage follower module and an isolation operational amplifier module before being transmitted to the AD acquisition module for data acquisition. This data is then transmitted to the integrated computing center for processing, thus enabling the measurement of the resistance values ​​of multiple pyrotechnic devices with only one detection path and one AD acquisition port, achieving time-division multiplexing of the detection channel.

[0040] This invention addresses the increasingly widespread application requirements of pyrotechnic ignition in agile aircraft, including multi-stage separation, lateral maneuvering, and vector thrust. It also targets the intelligent and integrated applications of aerospace electronic systems. The proposed method is an adaptive health diagnosis of pyrotechnics based on a reusable detection link using a constant current source and online data estimation using Kalman filtering. Utilizing the computing resources of the agile aircraft's aerospace electronic system's centralized computing center and a highly integrated self-testing link, this method enables rapid online health monitoring of more than 20 pyrotechnics. It solves the problems of poor accuracy, complex hardware, and low testing efficiency associated with traditional single-channel voltage measurement methods, thereby improving the test coverage, safety, and application reliability of agile aircraft.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. An agile aircraft pyrotechnic online self-adapting health detection system, characterized in that: It includes a constant current source, an integrated computing center, a reusable detection link, and an ignition circuit; the integrated computing center includes a timing logic control algorithm module and a data estimation module; the reusable detection link includes an analog switch 1, an isolation optocoupler, a multi-select analog switch, a voltage follower module, an isolation operational amplifier module, a differential operational amplifier module, and an AD acquisition module; the ignition circuit includes the pyrotechnic device to be tested; The timing logic control algorithm module receives pyrotechnic detection commands from an external ground testing system; controls analog switch 1 to connect with a constant current source, enabling the constant current source to power the reusable detection link; and controls the pyrotechnic to be tested to connect to the constant current source and the isolation optocoupler according to the pyrotechnic detection command. Constant current source: Powers the reusable detection link; provides a constant, weak current to the pyrotechnic device under test; The pyrotechnic device under test receives a constant, weak current from a constant current source to generate voltage; Multiple-select analog switch: Selects the corresponding ignition channel through an isolation optocoupler to acquire the voltage value of the pyrotechnic device under test; after acquiring the voltage value of one ignition channel, it connects the next ignition channel to re-acquire the data until the voltage values ​​of the pyrotechnic devices under test for all channels are acquired; and transmits the voltage values ​​of the pyrotechnic devices under test for all channels sequentially through the voltage follower module, the isolation operational amplifier module, the differential operational amplifier module, and the AD acquisition module to the data estimation module. Data estimation module: Receives the voltage values ​​of the pyrotechnic devices under test from all channels, performs adaptive compensation processing, and realizes adaptive online health detection of multiple pyrotechnic devices.

2. The agile vehicle EOD online self-adapting health detection system of claim 1, wherein: The constant current source includes a reference voltage source, a negative feedback network, an adjustable reference resistor R, and an anti-backflow diode; The reference voltage source adopts a voltage reference source with an output voltage accuracy of ±0.4%; the negative feedback network includes an isolation operational amplifier, as well as resistors and capacitors, which can increase or decrease the resistance value to adjust the current value output by the constant current source and achieve constant current output; the adjustable reference resistor R adopts a resistor with a deviation of ±0.1%; the adjustable constant current source is protected by an anti-backflow diode to prevent ignition voltage backflow.

3. The agile vehicle EOD online self-adapting health detection system of claim 2, wherein: The constant current source has a constant current range of 10-80mA.

4. The agile vehicle EOD online self-adapting health detection system of claim 1, wherein: The isolation optocoupler is controlled by a timing logic control algorithm module to switch on and off. The default state of the isolation optocoupler is the disconnected state. When the pyrotechnic device to be tested is being tested, the isolation optocoupler and the pyrotechnic device to be tested are in a connected state. When the pyrotechnic device to be tested is in an ignition state, the isolation optocoupler is in a disconnected state. This avoids the high voltage of the pyrotechnic device under ignition state from damaging the reusable detection link.

5. The agile vehicle EOD online self-adapting health detection system of claim 1, wherein: The voltage follower module isolates the multi-select analog switch from the isolation operational amplifier module, thereby improving the input voltage quality of the isolation operational amplifier module.

6. The agile vehicle EOD online self-adapting health detection system of claim 1, wherein: The isolated operational amplifier module amplifies the acquired voltage signal for easier acquisition by the AD acquisition module and isolates the acquisition ground wire from the ignition ground wire.

7. The agile vehicle EOD online self-adapting health detection system of claim 1, wherein: The differential operational amplifier module inputs the acquired voltage signal into the AD acquisition module in the form of a differential signal, reducing interference on the line and improving accuracy.

8. The agile vehicle EOD online self-adapting health detection system of claim 1, wherein: The AD acquisition module converts the acquired voltage signal from analog to digital.

9. The agile vehicle EOD online self-adapting health detection system of claim 1, wherein: The data estimation module performs Kalman filtering on the collected voltage signal, adaptively compensates the measurement result, corrects line error and collection error, reduces noise interference, improves measurement accuracy, and completes online detection of the condition of the initiating explosive device.

10. The method of claim 1, wherein: Comprise: S1, measure all ignition paths to obtain corresponding voltage value data V j , collect, filter and store; S2, using Kalman filtering method to filter and estimate the collected voltage value, estimate the error value, and complete online correction of the collected voltage value data to obtain the corrected voltage value.

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