Array type monitoring device for loose parts of nuclear power station

Abstract

The invention relates to an array type monitoring device for a loose part of a nuclear power station. The array type monitoring device comprises a channel selection array module and a channel switching array module which are integrated in a processor. The channel selection array screens target signals from multiple sound channels and playback channels through a preset logic (based on signal intensity and key areas), and supports single-channel extraction or multi-channel fusion; the channel switching array realizes smooth interference-free switching between real-time signals and between real-time and historical playback signals based on a special algorithm. The device adopts a 2U rack type design and is internally provided with a dual-power-amplifier system; a D-type power amplifier drives left and right sound channel loudspeakers by a high-frequency switch technology, and the power consumption is less than or equal to 75W; the class AB power amplifier drives an earphone interface through linear amplification, and the distortion rate is lt; 6%. And the integrated storage module supports historical sound data backtracking analysis. The problems that existing equipment is insufficient in multi-channel processing, inflexible in switching and poor in power amplifier adaptability are solved, and the comprehensiveness, timeliness and accuracy of nuclear power station loose part monitoring are comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant loosening monitoring technology, and in particular to an array-type monitoring device for loosening components in nuclear power plants. Background Technology

[0002] During the operation of a nuclear power plant, loose parts can pose a serious threat to the safe and stable operation of the equipment. Accurate monitoring of the acoustic signals from loose parts is crucial for timely detection of potential faults and ensuring the safety of the nuclear power plant. Existing monitoring devices suffer from insufficient multi-channel signal processing capabilities, inflexible channel switching, and poor amplifier compatibility, failing to meet the high-precision, multi-functional monitoring requirements of nuclear power plants for loose parts. Therefore, there is an urgent need for a monitoring device with multi-channel array processing, flexible channel switching, and compatible amplifiers. Summary of the Invention

[0003] This invention discloses an array-type listening device for loose components in nuclear power plants, used for multi-channel acquisition, processing, listening, and related functions of sound signals from loose components in nuclear power plants.

[0004] An array-type listening device for loose components in a nuclear power plant includes: The processor contains a channel selection array module and a channel switching array module. The channel selection array module is configured to: select one or more from the multi-channel input to form a monitoring selection channel (Ⅰ) through a preset selection logic; and acquire the associated channel audio signal (Ⅱ) through the selected one or more monitoring selection channels (Ⅰ). The channel switching array module is coupled to the channel selection array module, and the channel switching array module is configured to: receive the associated channel audio signal (II), and complete the channel switching based on the channel signal through the set channel switching algorithm and control logic.

[0005] Furthermore, the multi-channel input includes multiple audio channels and at least one playback audio channel; The sound channel is used to transmit the channel sound signal obtained by the monitoring device covering the loose parts of the nuclear power plant, and the channel sound signal is input to the channel selection array module through the input interface and stored in the storage module through the other channel. The playback audio channel is used to select channel audio signals from the storage module for audio playback.

[0006] Furthermore, it receives channel audio signals from multi-channel inputs; Based on a preset selection logic, at least one target signal channel is selected from the multi-channel input, and the channel audio signal of the selected target signal channel is output for subsequent processing. The selection logic is based on at least one or more factors, including signal strength and the key monitoring area, to select the channel.

[0007] Furthermore, the selection logic also includes calling a signal integration module set in the processor to fuse the channel audio signals of multiple associated target signal channels selected by the selection logic module, and outputting the fused signal through the output interface.

[0008] Furthermore, the control logic is configured to: control the channel switching array to perform switching operations between different sound channels of the multiple input audio signals based on the user operation command; The switching operation is executed by the control logic according to the internal channel switching algorithm to achieve fast and stable switching between different audio channels, and to ensure a smooth and interference-free switching process, thereby ensuring the continuity and accuracy of the monitoring output.

[0009] Furthermore, the user operation instructions include input from the channel selection buttons on the front panel.

[0010] Furthermore, the multi-channel input audio signal includes at least one channel audio signal and at least one playback audio signal; the control logic is configured to control the channel switching array to perform smooth and interference-free switching between the channel audio signal and the playback audio signal; Alternatively, the control logic is configured to control the channel switching array to perform smooth, interference-free switching between multiple channel audio signals; Alternatively, the control logic is configured to control the channel switching array to perform smooth, interference-free, synchronous mixing and switching between multiple channel audio signals and between the multiple channel audio signals and the playback audio signal.

[0011] Furthermore, the processor's output interface is connected to a Class D power amplifier module, which is configured as follows: Receive the channel audio signal output by the channel switching array module; The channel audio signal is amplified using high-frequency switching technology to generate a driving signal; the driving signal is then used to synchronously drive the left and right channel speakers. The Class D power amplifier module reduces the overall power consumption of the monitoring device by setting power conversion rules and outputting drive power with power loss below a threshold at a predetermined loudness and sound quality level.

[0012] Furthermore, the processor's output interface is connected to an AB-class power amplifier module, which is configured as follows: Receive the output signal after the switch; Combining the advantages of Class A and Class B power amplifiers, a linear amplification rule is maintained throughout the entire audio signal cycle. Based on the linear amplification rule, the signal is amplified with high precision and low distortion to drive the headphone jack to output a high-fidelity audio signal, so as to accurately reproduce the subtle features of the sound.

[0013] Furthermore, the storage module is used to store historically acquired channel audio signals; The processor is also configured to: in response to a historical data playback command, retrieve pre-stored historical sound data in the storage module and generate a playback sound signal; The channel switching array module is also configured to output the playback audio signal as one of the switchable output signal sources. It also includes an audio output interface for outputting the playback audio signal processed by the power amplifier module to a speaker or headphone jack to enable retrospective analysis of historical audio data.

[0014] The beneficial effects of this application are as follows: This application utilizes a processor-built-in channel selection array module to achieve intelligent management of multiple audio channels (17 / 24 / 28 channels selectable) and playback audio channels. Its preset selection logic dynamically filters target channels based on core factors such as signal strength and key monitoring areas, and supports the fusion of multi-channel signals through a signal integration module. This design solves the problem of insufficient multi-channel processing capabilities in traditional monitoring devices, enabling comprehensive coverage of potential areas where loose components may detach in nuclear power plants. Operators can accurately select key signal sources using front panel buttons, such as prioritizing monitoring high-vibration-risk areas or strong signal channels, significantly improving fault location efficiency. Simultaneously, multi-channel signals are stored in parallel to the storage module, providing a data foundation for subsequent retrospective analysis and ensuring comprehensive safety monitoring of nuclear power plants.

[0015] This application employs a smooth, interference-free channel switching array technology. The channel switching array module uses a dedicated switching algorithm and control logic to achieve rapid switching between multiple signals within the processor. Its core technology lies in the preset logic of "first disconnecting the current channel connection, then establishing the target channel connection," ensuring that there are no popping sounds or signal interruptions during the switching process. The module supports three switching modes: real-time switching between channel audio signals, switching between real-time signals and historical playback signals, and multi-signal mixed synchronous switching. For example, in the event of a sudden abnormal sound in a nuclear power plant, operators can instantly switch from regular monitoring to a channel for a key area, or compare historical playback data. The switching latency is less than milliseconds, and the output continuity is unaffected, significantly improving the timeliness and accuracy of abnormal response.

[0016] This application features a dual-amplifier system adapted to various monitoring scenarios, innovatively integrating Class AB and Class D dual-amplifier modules. The Class D amplifier employs high-frequency switching technology to amplify the signal output from the channel switching array with a conversion efficiency >90% (power loss below the threshold), driving the left and right channel speakers (built into a 482mm wide 2U chassis). While ensuring full-range sound reproduction from 80-16000Hz (parameter table), the overall power consumption is only 75W (far lower than traditional solutions), meeting the long-term operation requirements for multi-person monitoring. The Class AB amplifier, based on linear amplification principles, eliminates crossover distortion (audio distortion <6%) through a mixed Class A / B operating mode, driving the headphone jack to output high-fidelity audio. It is particularly suitable for capturing subtle characteristics of collision sounds from loose parts (such as high-frequency harmonics above 5kHz), assisting operators in accurately identifying potential hazards such as metal fatigue cracks. The dual system automatically switches via the processor, adapting to all scenarios from external speaker inspection to precise headphone diagnostics.

[0017] The system features historical data playback and retrospective analysis. The storage module continuously archives multi-channel audio signals, and the processor retrieves historical data to generate an independent playback channel when a playback command is received. This channel can be seamlessly switched in by a channel switching array (e.g., in a hybrid synchronous switching mode) and output to speakers or headphones via an amplifier module. For example, during routine maintenance at a nuclear power plant, operators can compare current pipe vibration sounds with data archived three months prior, amplifying the sound pressure level attenuation by less than 0.5 dB (frequency response ±5 dB) using a Class AB amplifier. This function overcomes the real-time limitations of traditional monitoring devices, providing data support for analyzing the deterioration trends of loose components and significantly improving predictive maintenance capabilities.

[0018] The integrated hardware and operation design utilizes a 2U rack-mount aluminum alloy housing, compatible with 19-inch rack mounting. The front panel integrates channel selection buttons, a volume knob, a headphone jack, and dual-channel speakers, forming a closed-loop operation link with the channel selection / switching array within the processor. For example, when the volume knob is rotated, the gain module adjusts the PWM duty cycle of the Class D amplifier or the bias voltage of the Class AB amplifier in real time, ensuring a distortion rate of <6% across the entire volume range (parameter table). This integrated design of "one-button channel selection, one-rotation volume adjustment" simplifies the complex monitoring process to three steps (initialization → channel switching → output), reducing the operational burden on personnel in the high-risk environment of nuclear power plants. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram illustrating the principle of horizontal depth detection provided by the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0022] A nuclear power plant detachment component array-type monitoring device includes: a processor, which has a channel selection array module and a channel switching array module; wherein, the channel selection array module is configured to: select one or more from multiple channel inputs to form a monitoring selection channel (Ⅰ) through preset selection logic; and acquire associated channel audio signals (Ⅱ) with the selected one or more monitoring selection channels (Ⅰ); the channel switching array module is coupled to the channel selection array module, and the channel switching array module is configured to: receive the associated channel audio signals (Ⅱ), and complete channel switching based on the channel signals through a set channel switching algorithm and control logic.

[0023] In the above, the multi-channel input includes multiple audio channels and at least one playback audio channel; the audio channels are used to transmit channel audio signals acquired by the monitoring device covering the loose parts of the nuclear power plant, and input the channel audio signals one way to the channel selection array module through the input interface, and store the other way to the storage module; the playback audio channel is used to select the channel audio signal from the storage module for audio playback.

[0024] In the above, channel audio signals from multi-channel input are received; based on preset selection logic, at least one target signal channel is selected from the multi-channel input, and the channel audio signal of the selected target signal channel is output for subsequent processing; wherein, the selection logic selects the channel based on at least one or more factors such as signal strength and monitoring key areas.

[0025] In the above, the selection logic further includes calling a signal integration module set in the processor to fuse the channel audio signals of multiple associated target signal channels selected by the selection logic module, and outputting the fused signal through the output interface.

[0026] In the above, the control logic is configured to: control the channel switching array to perform switching operations between different audio channels of the multi-channel input audio signals based on the user operation command; the switching operation is executed by the control logic according to the internal channel switching algorithm to achieve fast and stable switching between different audio channels, and ensure smooth and interference-free switching process, thereby ensuring the continuity and accuracy of the monitoring output.

[0027] In the above, the user operation instructions include input from the channel selection button on the front panel.

[0028] In the above, the multiple input audio signals include at least one channel audio signal and at least one playback audio signal; the control logic is configured to control the channel switching array to perform smooth, interference-free switching between the channel audio signal and the playback audio signal; or, the control logic is configured to control the channel switching array to perform smooth, interference-free switching between multiple channel audio signals; or, the control logic is configured to control the channel switching array to perform smooth, interference-free, mixed, and synchronous switching between multiple channel audio signals and the playback audio signal.

[0029] In the above, the processor's output interface is connected to a Class D amplifier module, which is configured to: receive channel audio signals output by the channel switching array module; amplify the channel audio signals based on high-frequency switching technology to generate a drive signal; and synchronously drive the left and right channel speakers with the drive signal. The Class D amplifier module, by setting power conversion rules, outputs drive power with power loss below a threshold at a predetermined loudness and sound quality level, thereby reducing the overall power consumption of the monitoring device.

[0030] In the above, the processor's output interface is connected to an AB class power amplifier module, which is configured to: receive the output signal after switching; combine the advantages of Class A and Class B power amplifiers, maintain a linear amplification rule throughout the entire audio signal cycle, and perform high-precision, low-distortion amplification of the signal based on the linear amplification rule to drive the headphone interface to output a high-fidelity audio signal, so as to accurately reproduce the subtle features of the sound.

[0031] In the above, the storage module is used to store historically acquired channel audio signals; the processor is further configured to: in response to a historical data playback command, retrieve pre-stored historical audio data in the storage module and generate a playback audio signal; the channel switching array module is further configured to: output the playback audio signal as one of the switchable output signal sources; and it also includes an audio output interface for outputting the playback audio signal processed by the power amplifier module to a speaker or headphone jack to realize retrospective analysis of historical audio data.

[0032] In the above-described device, multiple channels of audio signals, including channel audio signals and playback audio signals (1 channel), can be input to form a multi-channel array. The processor has a built-in channel selection array module, which can intelligently select and manage the multi-channel audio signals. Through preset selection logic, the device can accurately select the signal channel to be monitored from the multi-channel input according to actual needs, such as signal strength and key monitoring areas, achieving flexible selection and integration of multi-channel signals and providing diverse and accurate signal sources for subsequent processing.

[0033] As described above, the processor integrates a channel switching array module. Based on its internal channel switching algorithm and control logic, it can quickly and stably switch between different multi-channel inputs according to user operation commands (such as channel selection buttons on the front panel). When switching from a channel audio signal to a playback audio signal, or switching between multiple channel audio signals, the channel switching array ensures a smooth and interference-free signal switching process, guaranteeing the continuity and accuracy of monitoring, and allowing operators to obtain real-time sound information of loose parts from different channels.

[0034] Among the above, the Class D amplifier module possesses highly efficient power conversion characteristics. After receiving the channel audio signal output from the processor, it amplifies the channel audio signal through high-frequency switching technology, enabling it to output sufficient power to drive the left and right channel speakers with low power loss. While ensuring the loudness and sound quality of the sound output, it effectively reduces the overall power consumption of the device, making it suitable for general sound playback scenarios and providing operators with clear external sound monitoring.

[0035] In the above description, the Class AB amplifier module focuses on the delicate reproduction of sound quality. When processing audio signals, it combines the advantages of both Class A and Class B amplifiers, maintaining good linear amplification characteristics throughout the entire audio signal cycle. This allows for high-precision amplification of the sound signal, driving the headphone jack output. When operators use headphones for monitoring, the Class AB amplifier can accurately reproduce the subtle characteristics of the loose parts' sounds, facilitating the capture of key sound information and aiding in the accurate assessment of the loose parts' status.

[0036] In the above, the audio monitoring is integrated: the front panel features operation components such as a volume control knob and channel selection buttons, which work in conjunction with the channel selection array, channel switching array, and power amplifier module within the processor to achieve integrated operation of channel selection and audio monitoring. Operators can easily perform actions such as channel switching and volume adjustment through simple operations on the front panel, quickly obtaining the audio monitoring content of the corresponding channel.

[0037] In the above, historical data audio playback: the device's processor and storage module can record historically collected audio data. When historical data audio playback is needed, the processor retrieves the stored audio data, processes it through the power amplifier module, and outputs it through a speaker or headphone jack, facilitating retrospective analysis of the historical audio conditions of loose parts.

[0038] In the above, the standard output adapter is configured with a standard headphone output interface and left and right channel speaker outputs, which are adapted to Class AB power amplifiers and Class D power amplifiers respectively, to meet the needs of operators in different monitoring scenarios, such as multiple people monitoring through speakers on site, or a single person monitoring accurately through headphones.

[0039] This application constructs a closed-loop processing system covering signal acquisition, intelligent selection, seamless switching, efficient amplification, and historical backtracking. The physical layer adopts a 2U standard rack structure (482×87×400mm aluminum alloy housing). The rear panel connects to multiple channels of audio signals (±5V input, 40KΩ impedance) and one playback signal, while the front panel integrates speakers, headphone jacks, and operating controls. The signal flow begins with the multi-channel input: the acoustic signals from each monitoring point in the nuclear power plant are converted into electrical signals by sensors and transmitted in two paths via the input interface—one path goes to the channel selection array module within the processor, and the other path is stored in a storage module (such as an SSD). The channel selection array runs preset logic within the processor: First, it analyzes the signal strength of each channel (such as voltage peak value), and combines it with the preset monitoring area priority (for example, the reactor pressure vessel channel has a higher weight than the pipeline channel), and dynamically selects the target channel from 17 / 24 / 28 channels; when multi-source data correlation analysis is required (such as locating the collision propagation path), it calls the signal integration module to perform time-domain alignment and weighted fusion of the 80-16000Hz frequency band signals of three adjacent channels to generate a wideband fused signal (description

[0018] ). The channel switching array receives the output of the selection array, and its control logic responds to the front panel button commands to perform three types of switching: 1) Real-time channel switching, using the algorithm of "first disconnect the current channel - then establish the target channel - audio switch synchronization", the switching process is completed within 20ms and there is no level jump; 2) Real-time signal and playback signal switching, the historical data in the storage module is converted into analog signals and injected into the switching link through the DAC; 3) Hybrid synchronization mode, the two real-time signals and one playback signal are superimposed proportionally for comparative analysis. The switched signal is output in two paths: The Class D amplifier path receives the signal and converts it into a switching waveform via high-frequency PWM modulation (above 200kHz). After amplification by a MOSFET power bridge, it is restored to a driving waveform by an LC filter, driving the left and right channel speakers with a sound pressure level of above 85dB (power conversion efficiency >90%, total power consumption 75W). The Class AB amplifier path uses a push-pull circuit with a fixed bias voltage to ensure the transistors always operate in the linear region (eliminating Class B crossover distortion). When headphones are plugged in, it automatically switches to this path, restoring sound details (such as the 6kHz high-frequency component unique to metal cracks) with low distortion characteristics of THD <0.05%. The collaborative control layer is uniformly scheduled by the processor: the front panel volume knob adjusts the digital potentiometer, changing the signal amplitude sent to the amplifier; the gain indicator module provides real-time feedback of signal strength; the history playback function is triggered by a dedicated button, where the processor extracts compressed audio (e.g., 48kHz / 16bit) from the storage module, decompresses it, and sends it to the playback channel for switching. Ultimately, the device achieves full-band monitoring in ambient temperatures ranging from -40℃ to +75℃. Through the synergy of four technologies—multi-channel array coverage, seamless switching, dual power amplifier adaptation, and historical backtracking—it meets the high-precision monitoring requirements of nuclear power plants for millimeter-level displacement sounds of loose components.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nuclear power plant detachment component array-type listening device, characterized in that, include: The processor contains a channel selection array module and a channel switching array module. The channel selection array module is configured to: select one or more from the multi-channel input to form a monitoring selection channel (Ⅰ) through a preset selection logic; and acquire the associated channel audio signal (Ⅱ) through the selected one or more monitoring selection channels (Ⅰ). The channel switching array module is coupled to the channel selection array module, and the channel switching array module is configured to: receive the associated channel audio signal (II), and complete the channel switching based on the channel signal through the set channel switching algorithm and control logic.

2. The array-type listening device for loose components in nuclear power plants according to claim 1, characterized in that, Multi-channel input includes multiple audio channels and at least one playback audio channel; The sound channel is used to transmit the channel sound signal acquired by the monitoring device covering the loose parts of the nuclear power plant, and the channel sound signal is input to the channel selection array module through the input interface and stored in the storage module through the other channel. The playback audio channel is used to select channel audio signals from the storage module for audio playback.

3. The array-type listening device for loose components in nuclear power plants according to claim 1, characterized in that, Receives channel audio signals from multi-channel input; Based on a preset selection logic, at least one target signal channel is selected from the multi-channel input, and the channel audio signal of the selected target signal channel is output for subsequent processing. The selection logic is based on at least one or more factors, including signal strength and the key monitoring area, to select the channel.

4. The array-type listening device for loose components in nuclear power plants according to claim 1 or 3, characterized in that, The selection logic also includes calling a signal integration module set in the processor to fuse the channel audio signals of multiple associated target signal channels selected by the selection logic module, and outputting the fused signal through the output interface.

5. The array-type listening device for loose components in nuclear power plants according to claim 1, characterized in that, The control logic is configured to: control the channel switching array to perform switching operations between different sound channels of the multiple input audio signals based on the user operation instructions; The switching operation is executed by the control logic according to the internal channel switching algorithm to achieve fast and stable switching between different audio channels, and to ensure a smooth and interference-free switching process, thereby ensuring the continuity and accuracy of the monitoring output.

6. The array-type listening device for loose components in nuclear power plants according to claim 5, characterized in that, The user operation commands include input from the channel selection buttons on the front panel.

7. The array-type listening device for loose components in nuclear power plants according to claim 5, characterized in that, The multi-channel input audio signal includes at least one channel audio signal and at least one playback audio signal; the control logic is configured to control the channel switching array to perform smooth and interference-free switching between the channel audio signal and the playback audio signal. Alternatively, the control logic is configured to control the channel switching array to perform smooth, interference-free switching between multiple channel audio signals; Alternatively, the control logic is configured to control the channel switching array to perform smooth, interference-free, synchronous mixing and switching between multiple channel audio signals and between the multiple channel audio signals and the playback audio signal.

8. The array-type listening device for loose components in nuclear power plants according to claim 1, characterized in that, The processor's output interface is connected to a Class D power amplifier module, which is configured as follows: Receive the channel audio signal output by the channel switching array module; The channel audio signal is amplified using high-frequency switching technology to generate a driving signal; the driving signal is then used to synchronously drive the left and right channel speakers. The Class D power amplifier module reduces the overall power consumption of the monitoring device by setting power conversion rules and outputting drive power with power loss below a threshold at a predetermined loudness and sound quality level.

9. The array-type listening device for loose components in nuclear power plants according to claim 1, characterized in that, The processor's output interface is connected to a Class AB power amplifier module, which is configured as follows: Receive the output signal after the switch; Combining the advantages of Class A and Class B power amplifiers, a linear amplification rule is maintained throughout the entire audio signal cycle. Based on the linear amplification rule, the signal is amplified with high precision and low distortion to drive the headphone jack to output a high-fidelity audio signal, so as to accurately reproduce the subtle features of the sound.

10. The array-type listening device for loose components in nuclear power plants according to claim 2, characterized in that, The storage module is used to store historically acquired channel audio signals; The processor is also configured to: in response to a historical data playback command, retrieve pre-stored historical sound data in the storage module and generate a playback sound signal; The channel switching array module is also configured to output the playback audio signal as one of the switchable output signal sources. It also includes an audio output interface for outputting the playback audio signal processed by the power amplifier module to a speaker or headphone jack to enable retrospective analysis of historical audio data.

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