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  • 1
    Publication Date: 2020-08-29
    Description: Rolling element bearing is a very important part of mechanical equipment and widely used in rotating machinery. Rolling element bearings could appear localized defects during the working condition, which would cause the complex vibration response of bearings. Considering the shaft and bearing pedestal, a 4 degree-of-freedom (DOF) dynamic model of rolling bearing with compound localized fault is established based on time-varying displacement, and the vibration characteristics of rolling bearing with localized faults under different conditions are investigated. The established model is verified by the experimental vibration signals in time domain and frequency domain. The results show that the vibration response of compound fault is the result of the coupling action of a single fault of rolling element and outer race. The influences of compound fault on the vibration signals of the bearing were analyzed under three conditions. With the increasing of radial load, defect size, and rotation speed, the vibration amplitude of bearing would increase correspondently, which would accelerate the failure rate of bearing and reduce the service life of bearing. This model is helpful to analyze the vibration response of the rolling element bearing with single or compound fault.
    Print ISSN: 1070-9622
    Electronic ISSN: 1875-9203
    Topics: Mathematics
    Published by Hindawi
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  • 2
    Publication Date: 2017-02-08
    Description: The stakeholders’ perceptual evaluations of the supply structure of destination tourism play an important role in promoting the sustainable development of regional tourism. However, the research on the structural perceptions of destination tourism supply is relatively insufficient in current research on the perceptions of tourism stakeholders. This paper analyzes the perceptual differences among inbound tourists, community residents and tourism practitioners from the core and auxiliary tourism supply dimensions. After having applied the structural equation model in this paper, the advantages and disadvantages of the tourism supply of Xi’an, a famous tourist city in China, were identified. In addition, the findings of this paper are: the inbound tourists have high perceptual sensitivity over the factors of the urban core tourism supply; the community residents have high perceptual sensitivity over the auxiliary tourist supply factors; the tourism practitioners have similar perceptual sensitivity over the factors of urban core and auxiliary tourism supply. The advantageous factors involve tourist attractions, tourist shopping, tourist entertainment, hospitality environment and tourist information. Furthermore, the moderately stable supply factors of Xi’an include tourist transportation, tourist catering, tourist accommodation, marketing as well as safety and security, while the natural environment is the limiting factor. The results support sustainable development and the coordination of different stakeholders in the destinations.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 3
    Publication Date: 2017-12-14
    Description: MicroRNA-105 is involved in TNF-α-related tumor microenvironment enhanced colorectal cancer progression MicroRNA-105 is involved in TNF-α-related tumor microenvironment enhanced colorectal cancer progression, Published online: 13 December 2017; doi:10.1038/s41419-017-0048-x MicroRNA-105 is involved in TNF-α-related tumor microenvironment enhanced colorectal cancer progression
    Electronic ISSN: 2041-4889
    Topics: Biology , Medicine
    Published by Springer Nature
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