Active-type multi-level wireless networking transmission system under high and low frequency stresses for ocean engineering structure
Disclosed is an active-type multi-level wireless networking transmission system under high and low frequency stresses for ocean engineering structures, including sensor units, a multi-channel data acquisition unit, a micro-control processor unit, a data wireless transmission unit, a server unit and a feedback monitoring unit. The multi-channel data acquisition unit, connected to multiple sensors, is configured to acquire sensor monitoring data; and the server unit is configured to receive the acquired monitoring data in real time, and realize data visualization analysis and early warning analysis. In the present disclosure, the deficiencies in realizing active-type multi-level wireless networking monitoring for the ocean structures can be overcame.
1 . An active-type multi-level wireless networking transmission system under high and low frequency stresses for ocean engineering structures, comprising:
multiple sensor units, a multi-channel data acquisition unit, a micro-control processor unit, a data wireless transmission unit, a server unit and a feedback monitoring unit, wherein
the multiple sensor units are configured to monitor vibration responses of the ocean engineering structures and convert mechanical vibrations into electrical signals for an output signal;
the multi-channel data acquisition unit, connected to the multiple sensor units, is configured to acquire the output signal of an acquired monitoring data of the multiple sensor units, convert the output signal into a digital signal, and transmit the digital signal to the micro-control processor unit;
the micro-control processor unit is configured for preprocessing the acquired monitoring data and a data storage, and is connected to the data wireless transmission unit via serial port communication;
the data wireless transmission unit is configured to send the preprocessed acquired monitoring data by the micro-control processor unit to the server unit in real time;
the data wireless transmission unit contains a high and low frequency remote data wireless transmission module, adopting an encoding and decoding algorithm combining Hamming codes and parity check codes to transmit the preprocessed acquired monitoring data, and setting a high and low frequency conversion threshold value;
in a low frequency operation mode of 1 hertz (Hz), the preprocessed acquired monitoring data, when less than the high and low frequency conversion threshold value, is transmitted to the server unit in a low frequency range; and
the preprocessed acquired monitoring data, when greater than the high and low frequency conversion threshold value, is transmitted to the server unit in a high frequency range, triggering a high frequency operation mode of 55 hertz (Hz) for data transmission;
the server unit is configured to receive the preprocessed acquired monitoring data in the real time, perform data processing, storage, and visual analysis on monitoring results of the preprocessed acquired monitoring data and perform early warning in the ocean engineering structures; and
the feedback monitoring unit is configured to realize feedback monitoring and threshold value correction for multiple sensing systems of the active-type multi-level wireless networking transmission system.
2 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the multiple sensor units are placed at key positions of the ocean engineering structures to monitor abnormal vibration response data of the structures; and when the structures vibrate, a sensor material is subject to force change to generate an electric charge distribution change based on a piezoelectric effect, generating an electric signal.
3 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the multi-channel data acquisition unit comprises eight input channels, adopting a differential input mode, each input channel of the eight input channels receiving different types of sensor input signals and performing acquisition and conversion.
4 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the micro-control processor unit performs data filtering on the preprocessed acquired monitoring data acquired by the multi-channel data acquisition unit to eliminate invalid junk data, performs data conversion, and automatically compares the preprocessed acquired monitoring data with the high and low frequency conversion threshold value set in the high and low frequency remote data wireless transmission module.
5 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the Hamming codes detect errors occurring during the data transmission by adding redundant data, correct the errors according to the redundant data, and increase an effective distance of the data transmission by correcting the errors during the data transmission.
6 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the parity check codes help to verify an integrity of the preprocessed acquired monitoring data by adding parity check bits to the preprocessed acquired monitoring data, and discover and correct errors during the data transmission in the real time to reduce an error rate of the data transmission.
7 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein when the high and low frequency remote data wireless transmission module transmits in the high frequency operation mode and after an occurrence time of a last high frequency event is greater than 5 seconds, the preprocessed acquired monitoring data are less than the high and low frequency conversion threshold value, and the high and low frequency remote data wireless transmission module automatically switches to the low frequency operation mode for the data transmission.
8 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the server unit processes the preprocessed acquired monitoring data in the real time, calculates a weight of data evaluation indexes to obtain a data monitoring result of the preprocessed acquired monitoring data, and performs visual display by an electronic map to realize the early warning in the ocean engineering structures.
9 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the server unit may introduce meteorological data, display meteorological information of an area on an electronic map, and provide short-duration rainfall and early warning information for business managers.
10 . The active-type multi-level wireless networking transmission system under the high and low frequency stresses for the ocean engineering structures according to claim 1 , wherein the feedback monitoring unit centrally displays service statuses of the ocean engineering structures, and integrates the preprocessed acquired monitoring data of the ocean engineering structures in an area, realizing centralized monitoring and the early warning in the ocean engineering structures according to visualization and early warning results of the server unit, and simultaneously providing support for interactive feedback between the ocean engineering structures.