Lifeng Wang, Huijiang Qu, Longlong Sun, Ziwang Xiao, Long Liu and Sharf Shajib Ahmad
Due to the deformation between the pylon and the girder caused by single tension of cables, the previously tensioned steel strands have stress relaxation, resulting in the actual…
Abstract
Purpose
Due to the deformation between the pylon and the girder caused by single tension of cables, the previously tensioned steel strands have stress relaxation, resulting in the actual cable forces being less than the design cable forces. To compensate the stress loss caused by the single tension of cables, this paper aims to present a practical compensation algorithm of stress relaxation during the construction period.
Design/methodology/approach
From the perspective of the essential cause of the stress relaxation, finite element analysis is used to solve the tension control force of each steel strand after a rigorous theoretical formula derivation.
Findings
The deformation and tension control force of each steel strand decrease with the advance of the tension sequence, and the decline rate drops gradually. However, the calculated force values of the steel strand are in good agreement with the measured value as the cable length decreases.
Originality/value
The previous rough calculation methods for the tension force of steel strands cannot meet the accuracy, and the accurate calculation methods often include the solution of nonlinear equations, which complicate the calculating process. Otherwise, there are few studies on the compensation of stress loss by calculating the deformation of the steel strand during the tension process. So, it developed an accurate and efficient algorithm to determine the tension control forces.
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Keywords
This paper describes the different ways in which people in the highlands of Papua New Guinea are talking about climate change. It demonstrates that people locate themselves in…
Abstract
Purpose
This paper describes the different ways in which people in the highlands of Papua New Guinea are talking about climate change. It demonstrates that people locate themselves in this process of change in terms of food production and exchange, and that some of the changes being witnessed are also related to the impacts of a growing cash economy on social relations.
Methodology/approach
This ethnography involved 12 months fieldwork including participant observation and interviews.
Research limitations/implications
This is a qualitative study that recognises the perspective of local people for understanding culturally mediated experiences of climate change. However, data regarding rainfall and temperatures over time would be a useful addition for thinking about the extent to which the climate has in fact changed in recent years.
Practical implications
The implications of this paper are that the predictions made in 1990 about increases in production as a result of climate change are apparently coming true, with benefits for some food and coffee producers. But that there are complex social processes occurring at the same time as climate change that mean people’s ability to adapt is dependent on other social conditions. Maintaining ecologically sustainable methods of production and local cultural practices may enable more resilience to the impacts of climate change.
Originality/value
The experiences of people living in the Eastern Highlands and the ways in which people use the discourse of climate change are yet to be acknowledged in policy circles or socio-cultural anthropology literature. This paper presents a partial account of how people in Papua New Guinea are experiencing and talking about change.
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Long Wang, Fengtao Wang, Linkai Niu, Xin Li, Zihao Wang and Shuping Yan
The purpose of this paper is to combine triboelectric nanogeneration technology with ball bearing structure to achieve energy collection and fault monitoring.
Abstract
Purpose
The purpose of this paper is to combine triboelectric nanogeneration technology with ball bearing structure to achieve energy collection and fault monitoring.
Design/methodology/approach
In this paper, according to the rotation mode of ball bearings, the freestanding mode of triboelectric nanogeneration is selected to design and manufacture a novel triboelectric nanogeneration device Rolling Ball Triboelectric Nanogenerator (RB-TENG) which combines rotary energy collection with ball bearing fault self-sensing.
Findings
The 10,000s continuous operation experiment of the RB-TENG is carried out to verify its robustness. The accurate feedback relationship between the RB-TENG and rotation velocity can be demonstrated by the fitting comparison between the theoretical and experimental electrical signal periods at a certain time. By comparing the output electrical signals of the normal RB-TENG and the rotor spalling RB-TENG and polytetrafluoroethylene (PTFE) balls with different degrees of wear at 500 r/min, it can be concluded that the RB-TENG has an ideal monitoring effect on the radial clearance distance of bearings. The spalling fault test of the RB-TENG stator inner ring and rotor outer ring is carried out.
Originality/value
Through coupling experiments of rotor spalling fault of the RB-TENG and PTFE balls fault with different degrees of wear, it can be seen that when rotor spalling fault occurs, balls wear has a greater impact on the normal operation of the RB-TENG, and it is easier to identify. The fault self-sensing ability of the RB-TENG can be obtained, which is expected to provide an effective scheme for monitoring the radial wear clearance distance of ball bearings.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2024-0295/