Determination of Stay-Cable Forces Using Highly Mobile Vibration Measurement Devices

Morgenthal, Guido; Rau, Sebastian; Taraben, Jakob; Abbas, Tajammal

doi:10.1061/(asce)be.1943-5592.0001166

Cited by 24 publications

(15 citation statements)

References 18 publications

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“…Considering the SHM context, only a few studies are focused on measuring acceleration by only using microcomputer and external microelectromechanical system (MEMS)-based sensors. So far, mass market microcomputers and microcontrollers have been used as control platforms, which are accessed via WiFi from a computer, and Raspberry Pi (RPi) microcomputers have been connected to ADXL345 sensors [5] and directly to MPU-6050 accelerometers [6] or via Arduino Mega microcontroller [7]. Besides the application for vibration measurements, other wireless monitoring systems employing cost-effective microcomputers and microcontrollers in combination with specific piezoelectric sensors (PZTs) have been developed to identify local damage in reinforced concrete elements.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, different devices will offer different measurement quality, and the imposed limitations can solely be expressed as smartphone-dependent. Characteristics such as the maximum sampling rate, the range, and the resolution have been investigated in various studies [6,10,11,12], where maximum sampling rates of 225 Hz and resolvable accelerations down to 1 mm/s2 were found. However, the latest smartphone models are not covered.…”

Section: Introductionmentioning

confidence: 99%

“…Since the operating system can influence the achievable measurement quality, e.g., depending on battery status or the number of processes running in parallel, external sensors have also been used for data collection. The connection between smartphone and external sensors has been established wired [13] or wirelessly via microcontroller [6]. In order to collect, store, process, and visualize acceleration data, smartphone applications have been developed for Android [6,10] as well as for iOS [13,14] operating systems, which allow data handling within a single device.…”

Section: Introductionmentioning

confidence: 99%

“…All aforementioned systems utilize the MEMS–based acceleration sensors to determine the system properties of structures by measuring structural vibrations. As past studies have already shown, the sensor resolution and sampling rate, which result from differences in accelerometers and sensor driver software configuration, affect the properties of measurement data directly [6]. Based on this fact, sensor characteristics are further investigated with respect to the hardware used.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Wireless Sensor Networks Composed of Standard Microcomputers and Smartphones for Applications in Structural Health Monitoring

Morgenthal

Eick

Rau

et al. 2019

Sensors

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Wireless sensor networks have attracted great attention for applications in structural health monitoring due to their ease of use, flexibility of deployment, and cost-effectiveness. This paper presents a software framework for WiFi-based wireless sensor networks composed of low-cost mass market single-board computers. A number of specific system-level software components were developed to enable robust data acquisition, data processing, sensor network communication, and timing with a focus on structural health monitoring (SHM) applications. The framework was validated on Raspberry Pi computers, and its performance was studied in detail. The paper presents several characteristics of the measurement quality such as sampling accuracy and time synchronization and discusses the specific limitations of the system. The implementation includes a complementary smartphone application that is utilized for data acquisition, visualization, and analysis. A prototypical implementation further demonstrates the feasibility of integrating smartphones as data acquisition nodes into the network, utilizing their internal sensors. The measurement system was employed in several monitoring campaigns, three of which are documented in detail. The suitability of the system is evaluated based on comparisons of target quantities with reference measurements. The results indicate that the presented system can robustly achieve a measurement performance commensurate with that required in many typical SHM tasks such as modal identification. As such, it represents a cost-effective alternative to more traditional monitoring solutions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wireless Sensor Networks Composed of Standard Microcomputers and Smartphones for Applications in Structural Health Monitoring

Morgenthal

Eick

Rau

et al. 2019

Sensors

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“…Three papers in this collection present new methods for determining cable tensions. Morgenthal et al (2018), in a paper entitled "Determination of Stay-Cable Forces Using Highly Mobile Vibration Measurement Devices," present some methods to facilitate cable tensile force identification using highly mobile measurement equipment: modern Microelectromechanical systems (MEMS)-based acceleration sensors connected to battery-operated microcontrollers as well as those integrated in smartphones. The proposed methodology and implementation were validated through direct force measurements in a cable-stayed bridge under construction.…”

mentioning

confidence: 99%

Cable Structures in Bridge Engineering

Huang

Chen

2019

J. Bridge Eng.

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The special collection on Cable Structures in Bridge Engineering is available in the ASCE Library (https://ascelibrary.org/page/jbenf2 /cable_structures_bridge_engineering). Cable structures are used extensively in bridge engineering, including stayed cables of cable-stayed bridges, main cable and suspenders of suspension bridges, and hangers of arch bridges. These types of cable structures can offer an elegant and economic bridge alternative. They have become a primary choice for long-span bridges throughout the world, and methods of designing and constructing them have developed rapidly during the last two decades. Accordingly, research on the design, analysis, inspection, and rehabilitation of these types of structures has become one of the most interesting and timely subjects in bridge engineering. The special issue of the Journal of Bridge Engineering is intended to promote and improve the analysis, design, inspection, and rehabilitation of cable structures. Twenty-three papers were selected for this special issue, including 15 technical papers, six case studies, and two technical notes. These papers present recent advances in the design, analysis, vibration control, damage detection, and evaluation methods of different types of cable structures, including cable-stayed, suspension, and arch bridges. There are three papers regarding the layout and detailed design of cable structures. A paper titled "Conceptual Design of a New Three-Tower Cable-Stayed Bridge System with Unequal-size Fans" by Shao et al. (2018) presents a new type of three-tower cable-stayed bridge with unequal-size fans. Numerical analysis of conventional and proposed systems showed that this new system is an excellent alternative to conventional designs regarding the stiffness, internal forces, and cost. In addition, it is fully accepted that cable anchorages in cable bridge structures are critical, yet there are no simple design and analytical methods available. Hence, Wei et al. (2018), in their paper "Full-Scale Specimen Testing and Parametric Studies on Tensile-Plate Cable-Girder Anchorages in Cable-Stayed Bridges with Steel Girder," present their investigations of different types of cable anchorages through test and analytical methods. Their research results are useful for bridge design and analysis as well as future research. Another paper, "Analytical Models on Frictional Resistance between Cable and Saddle Equipped with Friction Plates for Multi-Span Suspension Bridges" by Cheng et al. (2018), presents a practical method for evaluating the frictional resistance in structural designs of suspension bridges and quantifying the effects of friction plates in practice. The method was verified with experimental results. The authors also concluded that incorporating vertical or horizontal friction plates significantly increases the frictional resistance and that using one horizontal friction plate is more effective in enhancing friction resistance than using one vertical friction plate.

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Modal analysis and tension estimation of stay cables using noncontact vision‐based motion magnification method

Wangchuk

Siringoringo

Fujino

2022

Structural Contr & Hlth

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Summary This paper describes a study on modal analysis and tension estimation of stay cables by vision‐based measurement under ambient condition. Microvibration of stay cable is captured by video camera, and the amplitude is amplified using phase‐based video motion magnification method. From the sequences of cable images, spatial displacements of the cable are extracted via discretized centroid searching method. Modal parameters of the cable, namely, natural frequency, damping ratio, and mode shape, are identified by dynamic mode decomposition method from cable displacement responses. Furthermore, tension of the stay cable is estimated based on the identified natural frequencies by minimizing an error function of an approximate relationship between frequency and tension iteratively. The technique is verified in the laboratory‐scale experiments and implemented to full‐scale measurement of medium size and long‐span cable‐stayed bridges. To compare the accuracy and efficacy of the vision‐based method, noncontact vibration measurement using laser Doppler vibrometer was also conducted. The results demonstrate that the proposed vision‐based vibration measurement techniques can estimate modal parameters and tension of the stay cables accurately in a noncontact and distant measurement under ambient condition. The proposed method offers an alternative of effective and accurate vibration measurement of stay cables using only motion of the cables recorded by video camera.

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Determination of Stay-Cable Forces Using Highly Mobile Vibration Measurement Devices

Cited by 24 publications

References 18 publications

Wireless Sensor Networks Composed of Standard Microcomputers and Smartphones for Applications in Structural Health Monitoring

Wireless Sensor Networks Composed of Standard Microcomputers and Smartphones for Applications in Structural Health Monitoring

Cable Structures in Bridge Engineering

Modal analysis and tension estimation of stay cables using noncontact vision‐based motion magnification method

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