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Quantitative Shape Measurement of an Inflatable Rubber Dam Using an Array of Inertial Measurement Units

Hu, Yonghui, Yan, Yong, Efstratiou, Christos, Vela-Orte, David (2021) Quantitative Shape Measurement of an Inflatable Rubber Dam Using an Array of Inertial Measurement Units. IEEE Transactions on Instrumentation and Measurement, 70 . Article Number 9506310. ISSN 0018-9456. (doi:10.1109/TIM.2021.3061244) (KAR id:86607)

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Shape measurement plays an important role in the condition monitoring and operation control of inflatable rubber dams. This paper presents a method to measure the cross-sectional shape of a rubber dam using an array of inertial measurement units (IMUs) placed on the circumference of the dam. Accelerometer and gyroscope measurements are combined using an adaptive complementary filter to determine the tangent angles of the dam circumference. The adaptive complementary filter adjusts the weights of the accelerometer and gyroscope measurements dynamically in order to reduce the uncertainty in orientation estimation due to external acceleration under dynamic conditions. A natural cubic spline that interpolates the measured tangent angles at discrete locations is used to represent the tangent angles along the dam circumference as a continuous function of the arc length. Finally, the cross-sectional shape is reconstructed by integrating the continuous tangent angle function along the circumference of the dam. Experimental assessment of the measurement system was performed on a purpose-built test rig using a digital camera as a reference measuring device. Results under a typical static condition show that the measured and reference shapes agree well with each other, with a similarity index of 3.74%, mismatch distance of the last IMU node being 12.3 mm and relative error of height measurement being -2.44%. Under dynamic conditions, the measurement results deteriorate due to external acceleration, but considerable improvement is achieved in comparison with an accelerometer-only approach. In addition, elimination of faulty nodes from shape reconstruction has negligible influence on the results, suggesting that the measurement system enjoys a high degree of fault tolerance.

Item Type: Article
DOI/Identification number: 10.1109/TIM.2021.3061244
Uncontrolled keywords: Inflatable rubber dam, shape measurement, inertial measurement unit (IMU), adaptive complementary filter, tangent angle, natural cubic spline
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA165 Engineering instruments, meters etc. Industrial instrumentation
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Yong Yan
Date Deposited: 15 Feb 2021 12:58 UTC
Last Modified: 02 Apr 2021 09:57 UTC
Resource URI: (The current URI for this page, for reference purposes)
Hu, Yonghui:
Yan, Yong:
Efstratiou, Christos:
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