A Miniaturized Digital Large-Scale Sensor Array Shock Monitoring System

Abstract

The invention discloses a miniaturized digital large-scale sensor array impact monitoring system, which comprises a system power supply module, a signal interface module, a trigger control module, a central processing module, a large-capacity onboard high-speed storage module, a wireless radio-frequency module, an external interacting interface and n piezoelectric sensors. The system has the characteristics of small volume, light weight, low power consumption and the like; the system does not need a signal conditioning circuit and an AD (analog / digital) converting circuit; through level comparison, the signals of the sensors are recorded in a Boolean way; the data of multiple effective piezoelectric sensors can be automatically extracted when an impact approaches; and the impact area and the position are further judged. The monitoring system can work in a controlling mode and a controlled mode; the large-scale sensor array monitoring can be achieved by adopting networking; and the monitoring data and the calculation result are sent through wireless transmission or an external bus, an airborne field bus of an airplane, a fiber data transmission bus of the airplane and the like.

Description

technical field [0001] The invention relates to a miniaturized digital large-scale sensor array impact monitoring system, in particular to the occasion for determining and recording the real-time impact area and impact position of a large aeronautical structure. The system has the characteristics of small size, light weight, and low power consumption. The system does not require signal conditioning and AD conversion circuits. It records sensor signals in the form of Boolean quantities through level comparison, and can automatically extract multi-channel effective piezoelectricity when the impact arrives. Sensor data and judgment on the impact area and location, can work in the master control and controlled mode, can use networking to realize large-scale sensor array monitoring, monitoring data and calculation results through wireless transmission or external bus, aircraft on-board field bus, Aircraft optical fiber data transmission bus and so on. Background technique [000...

AI Technical Summary

Problems solved by technology

[0004] However, for the impact monitoring of large-scale aeronautical structures, take the use of 24 piezoelectric elements to monitor impact signals as an example, and collect monitoring signals according to the traditional high-speed data acquisition test method. The system hardware adopts commercial 4-channel high-speed analog data acquisition cards and 4-channel charge Amplify the conditioner, then at least 6 data acquisition cards and 6 charge conditioners are required to complete the experiment of this project, plus the processor and chassis with unified control core required to integrate this number

A large number of modules with independent application functions and low integration directly lead to the increase of the complexity of the test environment and the difficulty of debugging the test system, as well as the huge size and quality of the system

However, for airborne equipment, it is required that its addition will not cause an excessive load burden on the aircraft, and the aircraft body structure needs to monitor a large area, especially the civil large passenger aircraft C919 that is in the development stage in my country. A monitoring system that supports 24 piezoelectric elements is not enough, and a large-scale piezoelectric sensor array is required to meet the requirements

But this further increases the volume and quality of the monitoring system

At the same time, the large-scale sensor array and the excessive redundancy and invalid information generated by the long-term flight of the aircraft also pose a severe challenge to the system memory capacity.

Therefore, the existing passive structural health monitoring system cannot meet the requirements of impact monitoring airborne equipment

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