Research On Health Monitoring Technology Of Breakwater Revetment Block Based On Inertial Sensor

Breakwater Armour block is an important hydraulic protection in coastal areas.It can eliminate the huge impact of waves on breakwater,slow down the damage of wave force on breakwater and increase the service life of breakwater.A large number of breakwater collapse accidents show that the change of position and instability of Armour block is an important reason for breakwater damage.When the Armour block is impacted by waves for a long time,its surface will be damaged and even cause large-area instability.In the previous research on the pose measurement and instability of the Armour block,it only stays in the qualitative analysis of the pose measurement change and instability of the Armour block,and no specific quantitative value is given.In this paper,a research method based on the combination of inertial sensor and breakwater armor block is proposed to measure the position and attitude of armor block and study the instability of armor block respectively.The Internet of things cloud platform for dynamic health monitoring of breakwater armor block is built,and the effect of the health monitoring platform is verified in combination with the actual engineering environment.Firstly,the composition principle of inertial sensor,signal integration algorithm and decentralized filtering algorithm are understood.Secondly,the measurement test of the pose change of the Armour block is designed,the generated signal is processed,and then the stability test of the Armour block is carried out.The influence of different water level and rocking angle on the stability of the two blocks is studied respectively.Finally,a dynamic breakwater Armour block health monitoring platform is built through One NET Internet of things cloud platform,and the effect of the health monitoring platform is verified by experiments combined with the actual engineering environment and local wave tide changes.The results show that the number of collisions at the waterlinez D_n=-2 is greater than that at the waterlinez D_n=0andz D_n=2,and the maximum impact velocity occurs at the waterlinez D_n=0.At the same time,in the stability test and research of the Armour block,the hook between the test block and the surrounding Armour block will disappear at the moment of instability.The sudden change range of the angle value of the test block is 10～30°,and the surrounding blocks will also have a small angle change of 0～20°with the instability of the test block,but this will not affect the overall stability of the surrounding blocks.The One NET Internet of things cloud platform can dynamically monitor the three-axis angle change of the Armour block.When it exceeds the set threshold,an alarm will be generated,The reliability of the health monitoring platform is verified by combining the built health monitoring platform with the actual engineering environment.Therefore,through the above research,we can quantitatively evaluate the pose change and swing angle value of the armor block,and realize the health monitoring of the breakwater armor block through the previous experimental research values.