Method and system for synchronous acquisition of wireless sensor network for structural health monitoring

Abstract

The invention discloses a method and a system for the synchronous acquisition of a wireless sensor network for structural health monitoring. The method comprises the following steps: when a time synchronization packet sent by a gateway is received, adjusting local time by nodes according to sending timestamp and receiving timestamp to complete time synchronization; when the nodes receive pre-synchronous acquisition instructions broadcasted and sent by the gateway and reach the preset start time of the synchronous acquisition, taking the preset start time of the synchronous acquisition as the physical time of the starting of the synchronous acquisition by the gateway, performing zero clearing on the local time by each node to start acquiring data, marking the relative timestamp and the serial number of data packets in the acquired data packet, and sending the data packet to the gateway; and performing flexible optimization on the relative time of each node by the gateway according to relative timestamp and the serial number of the data packets, and adding the relative time to the physical time as synchronous acquisition time information of each data packet. The method can realize time synchronization and the synchronous acquisition in the process of acquisition, ensure that the time of sampling points is accurate, avoid packet loss and ensure the reliability of global diagnosisin the process of the structural health monitoring. The invention simultaneously discloses a system for the synchronous acquisition of the wireless sensor network for the structural health monitoring.

Description

technical field [0001] The invention relates to the field of wireless sensor networks, in particular to a wireless sensor network synchronous acquisition method and system suitable for structural health monitoring. Background technique [0002] As we all know, real-time monitoring of the safety status of civil engineering structures is very important for project engineering, in order to avoid many safety accidents caused by the damage of major structures and equipment, and to guide the maintenance of major structures. Structural damage information for engineering structures. [0003] The acquisition of structural damage information in structural health monitoring requires the use of synchronous acquisition technology, which is the basis for global diagnosis or important area diagnosis (referred to as "field diagnosis") of damage to service structures. If the structural damage information of each node does not have spatial and Time information is meaningless, therefore, sync...

AI Technical Summary

Problems solved by technology

Synchronous acquisition is based on time synchronization. Existing time synchronization technologies have been widely used in wireless sensor networks, such as Reference Message Time Synchronization (RBS), Delay Measurement Time Synchronization (DMTS), Flooding Time Synchronization Protocol (FTSP), etc. Although these synchronization technologies achieve the clock consistency between wireless sensor nodes and wireless gateways, and avoid the negative impact of wiring on signal attenuation and interference in traditional solutions, however, due to the large amount of data collected and the high frequency of data collection in the process of structural health monitoring, the current Time synchronization technology cannot achieve time synchronization and synchronous acquisition during the acquisition process, so the clocks of each sensor node will have vertical and horizontal offsets during the acquisition process, which will lead to disorder of the synchronous acquisition time information of each node, and the time information of the sampling point is valid sex is not guaranteed

In addition, due to the high frequency of collection, there will be packet loss, which will seriously affect the alignment and data processing of the data of each node in the later stage, and the reliability of global diagnosis in structural health monitoring cannot be guaranteed.

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