Next Article in Journal
Large-Scale, Fine-Grained, Spatial, and Temporal Analysis, and Prediction of Mobile Phone Users’ Distributions Based upon a Convolution Long Short-Term Model
Next Article in Special Issue
Hybrid Data Fusion DBN for Intelligent Fault Diagnosis of Vehicle Reducers
Previous Article in Journal
Joint Optimization of Interference Coordination Parameters and Base-Station Density for Energy-Efficient Heterogeneous Networks
Open AccessArticle

An Improved Step-Type Liquid Level Sensing System for Bridge Structural Dynamic Deflection Monitoring

by Xijun Ye 1, Zhuo Sun 1, Xu Cai 1,* and Liu Mei 2
1
School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
2
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(9), 2155; https://doi.org/10.3390/s19092155
Received: 9 April 2019 / Revised: 7 May 2019 / Accepted: 8 May 2019 / Published: 9 May 2019
Real-time and accurate monitoring of dynamic deflection is of great significance for health monitoring and condition assessment of bridge structures. This paper proposes an improved step-type liquid level sensing system (LLSS) for dynamic deflection monitoring. Layout of straight-line-type pipeline is replaced by step-type pipeline in this improved deflection monitoring system, which can remove the interference of the inclination angle on the measurement accuracy and is applicable for dynamic deflection monitoring. Fluid dynamics are first analyzed to demonstrate that measurement accuracy is interfered with by the fluid velocity induced by structural vibration, and ANSYS-FLOTRAN is applied for analyzing the influence range caused by the turbulent flow. Finally, a step-type LLSS model is designed and experimented with to verify the influence of the three key parameters (initial displacement excitation, step height, and distance from the measurement point to the elbow) on the measurement accuracy, and the reasonable placement scheme for the measurement point is determined. The results show that the measurement accuracy mainly depends on the turbulent flow caused by step height. The measurement error gets smaller after about 1.0 m distance from the elbow. To ensure that the measurement error is less than 6%, the distance between the measurement point and the elbow should be larger than 1.0 m. View Full-Text
Keywords: structural health monitoring; dynamic deflection; liquid level sensing system; step-type structural health monitoring; dynamic deflection; liquid level sensing system; step-type
Show Figures

Figure 1

MDPI and ACS Style

Ye, X.; Sun, Z.; Cai, X.; Mei, L. An Improved Step-Type Liquid Level Sensing System for Bridge Structural Dynamic Deflection Monitoring. Sensors 2019, 19, 2155.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop