Study of creep behavior of load cells

Mohamed, M. I.; Hasan, Ebtisam H.; Aggag, G.

doi:10.1016/j.measurement.2009.03.001

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…16-18, a rheological model can be used to fit the data. Such rheological models have been used to study the viscoelastic behaviour of materials [11], which are adapted later to study the creep behaviour of load cells [12] and [13]. The particular model proposed here is a network of Voigt elements in series as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Humidity and temperature effects on torque transducers, bridge calibration unit and amplifiers

et al. 2015

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Section: Resultsmentioning

confidence: 99%

Humidity and temperature effects on torque transducers, bridge calibration unit and amplifiers

et al. 2015

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“…To reduce the effect of the noise, a differential system is built as shown in Figure 2. Two identical parallelogram mechanisms (PM) serve as the mechanical spring [23][24][25] as shown in Figure 2(a). Four notch pivots, which are circle notch, are needed and carved into the stage in order to achieve rectilinear motion capability as shown in Figure 2(b).…”

Section: The Differential Methodmentioning

confidence: 99%

The Differential Method for Force Measurement Based on Electrostatic Force

et al. 2017

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The small force measurement is very important with development of the technology. The electrostatic force is adopted, in which a pair of coaxial cylindrical capacitors generate the electrostatic force when a voltage is applied across the inner and outer electrodes. However, the measured force will be covered by noise (creep, ground vibration, and air flow) and could not be measured accurately. In this paper, we introduce the differential method to reduce the effect of noise. Two identical parallelogram mechanisms (PM) serve as the mechanical spring. One of the PM serves as the reference and another serves as the force sensor. The common signal will be offset, and the difference signal will serve as output. In this way, the effect of the creep will be reduced. The measurement system of the electrostatic force was characterized by applying mechanical forces of known magnitude via loading weights of calibrated masses. The uncertainty from voltage, laser interferometer, and capacitance gradient was estimated. For the measured force, the relative uncertainty is less than 4% (kp=2).

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“…1. Bartel and Yaniv (1997) and Mohamed et al (2009), since the weight on the scale would be sustained for very long time for the continuous measurement of soil water content, the digital scale was calibrated to capture the deformation of the scale cantilever load cell subjected to long-term loads. The calibration factors, capturing the relationship between scale reading and time, were then established for the precise determination of the changes of the water content during the experiments.…”

Section: Developed Weight-controlled Bender Element Testmentioning

confidence: 99%

Impacts of matric suction equalization on small strain shear modulus of soils during air drying

et al. 2020

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In this study, a weight-control bender element system has been developed to investigate the impact of matric suction equalisation on the measurement of small strain shear modulus (Gmax), during an air-drying process. The setup employed is capable of measuring the shear wave velocity and the corresponding Gmax of the soil sample in either an open system in which the soil sample evaporates freely or in a closed system that allows the process of matric suction equalisation. The comparison between measurements of Gmax in the open and closed systems revealed underestimations of Gmax when matric suction equalisation was ignored due to the non-uniform distribution of water content across the sample cross-sectional area. This study also investigated the time required for matric suction equalisation tse to be established for samples with different sizes. The experimental results indicated two main mechanisms, driving the matric suction equalisation in a closed system during an air-drying process, namely the hydraulic flow of water and the flow of vapour. While the former played the key role when the micro-pores were still saturated at the high range of water content, effects of the latter increased and finally dominated when more air invaded the micro-pores at lower water contents.

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Study of creep behavior of load cells

Cited by 12 publications

References 1 publication

Humidity and temperature effects on torque transducers, bridge calibration unit and amplifiers

Humidity and temperature effects on torque transducers, bridge calibration unit and amplifiers

The Differential Method for Force Measurement Based on Electrostatic Force

Impacts of matric suction equalization on small strain shear modulus of soils during air drying

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