A digital asynchronous compression sampling system and method for shock monitoring
A technology of shock monitoring and compressed sampling, which is applied in the general control system, control/regulation system, program control, etc., can solve the problems of large nonlinear interference, not suitable for shock monitoring signal compression, and difficult implementation, so as to reduce power consumption Effect
Active Publication Date: 2020-02-11
XIAMEN UNIV
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The existing compressed sensing implementation methods are either difficult to implement, or are aimed at sparse frequency domains, and many of them are built using analog circuits, which are particularly affected by various nonlinear interferences such as circuit systems and environmental noise. Compression suitable for shock monitoring signals
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[0039] The specific working mode of a digital asynchronous compression sampling system and method for shock monitoring will be described below in conjunction with the accompanying drawings.
[0040] Such as figure 1 Shown is the application of the digital asynchronous compressed sampling system in shock monitoring. The digital asynchronous compressed sampling system includes a ternary time domain encoder module, an algorithmic logic module and a signal recovery module. Specifically, after the structure is impacted, the piezoelectric sensor (multiple) will receive the signal, and then reach a certain range after being adjusted by the charge amplifier. If there is an impact trigger, it will trigger. If there is no impact, the digital asynchronous compressed sensing system will not work. . The impact monitoring signal is encoded into a ternary time-domain signal through a ternary encoder module. The ternary time-domain signal is compressed and sampled by the algorithm logic mod...
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The invention provides an impact monitoring-orientated digital asynchronous compressive sampling system and method. According to the system and method of the invention, as for the time-domain sparseness and crest obviousness of impact monitoring signals, compressive sampling can be effectively performed on the impact monitoring signals. The system comprises three main parts, namely a time-domain ternary (-1,0,1) encoder module, an arithmetic logic module and a signal recovery module. According to the system and method of the present invention, change quantities in the impact monitoring signalscan be effectively captured; the impact monitoring signals are first subjected to ternary coding; and ternary coded information is subjected to compressive sampling, so that a small number of sampling points are obtained to recover original signals, and therefore, the storage pressure of data transmission can be decreased. Compared with a traditional analog compressive sampling method, the methodof the present invention is realized by digital circuits, so that the influence of noise interference and nonlinear factors in circuit systems can be decreased, and reconstruction accuracy can be improved. According to the method of the present invention, a time-division work scheme is adopted, so that the power consumption of the system can be effectively reduced.
Description
technical field [0001] The invention relates to the field of structural health monitoring, in particular to a digital asynchronous compression sampling system and method for impact monitoring. Background technique [0002] With the development of science and technology society, my country has made important breakthroughs and progress in major engineering fields such as aerospace, high-speed rail, and bridges in recent years. The smooth operation of these major facilities is closely related to the safety of the people. These facilities will inevitably be impacted by various objects during their operation. These different forms of impact can have various effects on the structure. Although some impacts are invisible to the naked eye, they will cause hidden damage to the structure, and these hidden damage will cause serious safety hazards to the operation of the facility. Some facilities have very large structures, and it will take a lot of manpower, material resources and ti...
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IPC IPC(8): G05B19/042
Inventor梁栋李星朱强王奕首孙虎卿新林
OwnerXIAMEN UNIV