Study on temperature characteristics and correction of strain gauge balance in actual airflow environment

Wang, Chao; Mi, Peng; Tian, Zhengbo; Yi, Guoqing

doi:10.1016/j.ast.2020.106201

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Measurement of the COF with high precision and resolution is the most difficult and vital part of low-temperature tribometers. In addition to decoupling problems of friction and load force similar to conventional tribometers, the influence of low and varied temperatures on two-dimensional force measurement should be considered, as the elastic structure stiffness of the force sensor changes with temperature, which causes large sensor drift and seriously affects the measurement accuracy [92][93][94]. Calibration of the force sensor at different temperatures can be conducted to eliminate the influence of various temperatures; however, the process is complex and cumbersome.…”

Section: Tribological Testing Technology At Low Temperaturesmentioning

confidence: 99%

Progresses on cryo-tribology: lubrication mechanisms, detection methods and applications

Cui

Hongzhan

Zhao

et al. 2023

Int. J. Extrem. Manuf.

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Tribology at cryogenic temperatures has attracted people’s attention since the 1950s with the acceleration of its applications on hi-tech equipment such as the cryogenic wind tunnel, liquid fuel rocket, space infrared telescope, superconducting device, planetary exploration, which requires solid lubrication for moving parts at low temperature down to 4 K in cryogenic liquid, gaseous or vacuum environments. Here the research progresses on cryo-tribology are reviewed. Tribological properties and mechanisms of solid lubricants listed as carbon material, molybdenum disulfide (MoS2), polymer and polymer-based composite, etc. with decreasing temperature are summarized. The friction coefficient was found to increase with decreasing temperature induced by thermally activated processes. The mechanism of transfer film formation should be noticed as a significant way to promote the tribological properties of the solid lubricant. On the other hand, applications of solid lubrication on moving parts under cryogenic conditions such as the spherical plain bearing, roller bearing are introduced. Tribological test technology of materials and bearings at cryogenic temperatures is summarized where the environmental control, motion and loading realization, as well as friction and wear measurement together at low-temperature environment result in the difficulties and challenges of the low-temperature tribotester. It is worth mentioning that novel technologies and tribotesters were developed for tribo-tests and tribological studies of solid lubricant, spherical plain bearing and roller bearing respectively by overcoming the limitation on cooling in vacuum, resolution of friction measurement, etc., and concentrating on in-situ observation of friction interface aiming to not only promote a deep understanding of friction and wear mechanism at low temperatures, but also give insights into performance of moving parts or components in cryogenic applications.

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Section: Tribological Testing Technology At Low Temperaturesmentioning

confidence: 99%

Progresses on cryo-tribology: lubrication mechanisms, detection methods and applications

Cui

Hongzhan

Zhao

et al. 2023

Int. J. Extrem. Manuf.

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show abstract

“…Instruments in WTL facility is subject to the scope and objective of the investigation namely auxiliary mechanical behavior data acquisition system [17]- [19], flow visualization [20]- [22], fluid flow factors [23], [24] and WTL flow condition [25], [26]. Instruments such as torque transducer [27], [28], pressure transducer [29], [30] and strain-gauge sensor or load cell [31]- [33] is required to investigated the properties of a body influence under flow. There are two types of torque meter namely reaction (static) and rotary (dynamic or rotational).…”

Section: Literature Reviewmentioning

confidence: 99%

A Low-Cost Digital Torquemeter Coordinated by Arduino Board

Ashwindran,

Azizuddin,

Oumer

2023

IJIE

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Torquemeter is a transducer for measuring rotational force and converting it into electronic output signal. In this paper, the techniques to fabricate a low cost yet effective torquemeter system is introduced. The device is calibrated and tested to prove it effectiveness and robustness. Thesystem is developed to investigate thetorquegeneratedbywind turbinesystem.The presented torquemeter system comprisesof two subsystemsnamely photointerrupter (primary) and load cell (secondary).The reliability of the developed system is analyzed bystages in order to verify the effectiveness in acquiring measurementnamely RPM, weight (load) and torque. It is found that 5 kg load cell illustratedunsteady noise behavior relative to the defined calibration weight. Meanwhile, the percentage of accuracy (Pa) of final 3threading is Pa= 94.709 %, 97.32 %, 98.826 % for 10 g, 20 g and 100 g respectively.Measurement acquired from torquemeter system is compared against2D CFD numerical modelunder similar flow condition. Resultsshows that themeasurement of torquemeter system is Mt= 0.731842 and as for CFD model is Mt= 0.82553 which results in error (%) of Pe= 11.35 %. However,the CFD numerical model has overpredicted moment value since it has compensated the blockage factor and external environmental factors. It is safe to say, that the presented instrument is applicable and feasible for WT torque acquisition.

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“…Such apparent strain was quantified using a function relevant to the magnitudes of the temperature as applied to the testing environment, although the origin of this strain was not clarified. In the measurements of forces and moments in wind tunnel tests using strain gauge balances, the influences on the measurements by the thermal gradients in the balances were evidenced [13][14][15]. The overall output of these strain gauge balances was shown to be reversible when the temperature in the balances was recovered.…”

Section: Introductionmentioning

confidence: 98%

The effects of the temperature in the testing system on the measurements of thermal rock strain with clip-on extensometers

et al. 2022

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Study on temperature characteristics and correction of strain gauge balance in actual airflow environment

Cited by 6 publications

References 5 publications

Progresses on cryo-tribology: lubrication mechanisms, detection methods and applications

Progresses on cryo-tribology: lubrication mechanisms, detection methods and applications

A Low-Cost Digital Torquemeter Coordinated by Arduino Board

The effects of the temperature in the testing system on the measurements of thermal rock strain with clip-on extensometers

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