Chuanqing Dai , Tao Xin , Sen Wang , Yi Yang , Chao Kong , Yaoxuan Fang
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引用次数: 0
Abstract
The shear-type vibration-damping fastener (SVF) is widely recognized for the superior vibration-reduction effect. However, in a certain city’s metro lines, despite the use of SVF, environmental vibration issues have significantly impacted nearby residents as the operational years have increased. Field investigations revealed a severe rail corrugation phenomenon in the vibration-sensitive section, which may be a potential cause of the suboptimal vibration-damping performance of the SVF. To study this issue, a typical section with severe rail corrugation was selected for on-site testing research. The impact of replacing the SVF with compression-type vibration-damping fasteners (CVF) and subsequent rail grinding on the vibration time–frequency characteristics and noise was analysed. Results indicate that the typical wavelength of rail corrugation of 55–60 mm generated after long-term operation of the SVF track system is associated with wheel-rail system resonance within the frequency of 300.9–328.3 Hz. After replacing the SVF with CVF, the rail vibration acceleration intensity decreased by 36.3 %, and the rail vibration amplitude in the dominant frequencies range of 300–350 Hz significantly reduced, demonstrating a certain degree of control over rail corrugation. Following the rail grinding, the rail dominant frequencies shifted to higher band, the vibration source strength of the tunnel wall decreased by 2 dB, and the noise level within the tunnel was significantly reduced, with the A-weighted maximum sound pressure level decreasing by 12.4 dB(A). The findings provide theoretical references for analysing the failure causes of vibration-damping fastener performance in metro systems and offer potential solutions.
期刊介绍：
Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies.
Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials.
Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged.
Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.
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