With the publication and implementation of the national standard GB 36246 “Sports Ground for Synthetic Materials in Primary and Secondary Schools”, relevant testing activities have come in droves. However, the smooth development of testing requires not only standards, but also corresponding testing equipment. Therefore, in accordance with the requirements of the national standard GB 36246 for vertical deformation measurement indicators, this paper carried out the design and research work of related testing equipment, and successfully developed a synthetic material-based surface Layer vertical deformation measuring instrument, which connects the electromechanical control system composed of electromagnetic control system, main structure, etc. and the data storage and analysis system, realizes the systemization and automatic control of the synthetic material surface vertical deformation measuring device, and meets the national standard GB 36246 and European standard EN14809 “Measurement method of vertical deformation of ground layer of sports field”.
This paper summarizes the whole process of design, trial-manufacture, improvement and final design of the spring, which is the core part of the shock absorption device for the surface layer of synthetic materials in the standard GB 36246-2018 “Surface layer sports ground for primary and middle schools”. The successful development of this key part fills the blank of spring deformation parts in domestic testing industry, and can be used in other fields.
Composite insulators are insulation parts which are used to withstand power load and all kinds of stress applied by wires in transmission lines,the stress offen cause fracture and brittle fracture of core rods in the operation.In this paper,composite insulators, running in the ice coating and wind load conditions of Three Gorgee Area,is chose as the research object.Based on theory of mechanics of materials end experiment results carried out in existing papers and simulation of the bending stress of composite insulators, the stress failure of the insulator (FXBW4-110/70) in 110kV transmission lines were studied.The results show that, under the single action of tension,torsion and bending load,the instantaneous fracture of 110kV suspension-type composite insulators could not happen in the Three Gorgee Area. The line galloping and sleet jump of conductor make the fracture of bent insulators happen in the locations near towers. The results also found that the longrunning composite insulators could make stress concentration position shift ,eventually lead to brittle fracture.
In this paper, the contact characteristics of the carbon brush/slip ring of the hydrogenerator under the eccentric vibration of the rotor are studied. The influence of spring parameters on the contact loss of the carbon brush/slip ring was studied by establishing the motion model of the carbon brush/slip ring for theoretical calculation and fitting the motion trajectory curve with MATLAB software. Studies have shown that the loss of contact is mainly related to the spring damping coefficient and the precompression. By optimizing these two parameters, the contact stability of the carbon brush on the ring surface of the slip ring can be improved. It provides a theoretical reference for the design and optimization of the parameters of the carbon brush/slip ring spring.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.