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method. The rail, slab and bridge were respectively considered as the infinite Timoshenko beam, the freedom-freedom Euler beam and the simply supported Euler beam, and the fastener system and CA mortar... is applied at the midspan of fastener space) 从图2可知:在200 Hz以下频率范围内,轨道板的垂向位移响应和桥梁的变化趋势几乎是一致的,轨道板在此频率范围的位移响应幅值出现了3个峰值,也是伴随着桥梁结构的位移响应幅值的峰值出现的,因此,可以推断在垂向简谐荷载作用下,200 Hz以下频率范围内轨道板是随着桥梁在垂向产生振动的,在特别是在20 Hz以下,轨道板的......
端首个扣件反力和钢弹簧反力 Fig. 5 Reaction forces of the first fastener and steel spring at the left end of deteriorated slab 5.2 浮置板抗弯刚度劣化程度的影响 为深入研究浮置板抗弯刚度劣化程度对地铁车轨振动的影响,计算不同刚度劣化系数(α=0~0.9)情况下列车-轨道系统的振动响应,见图6. 如...]. 中南大学学报(自然科学版), 2020, 51(4): 1154-1162. WEI Gang, DONG Beibei, JIANG Jiqing, et al. Influence of fastener failure on dynamic performance of metro monolithic track system [J]. Journal of Central South......
braking and load case of rail breaking. It is favorable to use large resistance fastener and continuous welded rail across sections to ensure high safety and high speed of trains running on high-speed......
横向振动容许极限车速分别提高了18.7%,24.3%,26.6%和28.0%.当K2＞120 MN/m时提升幅度较小. 表3 扣件强化条件下FTT系统横向振动稳定性计算结果 Table 3 Calculation results of lateral vibration stability of FTT system under fastener strengthening 为分析扣件强化对货物......
structure. In the frequency range of 200-1 200 Hz, the power flow of the roadbed slab passes from rail is reduced to maximum by fastener to achieve the optimal vibration reduction effect. In the low...%. 图4 钢轨功率流随扣件刚度的变化 Fig. 4 Variation of power flow of rails with change of fastener stiffness 图5所示为道床板功率流随扣件刚度的变化.由图5可见:当频率为200~1 200 Hz时,随着扣件刚度增加,传递到道床板的功率流增加,并且随着激振频率增加,道床板功率流随扣件刚度的增幅减小.当......
that pitting typically occurs around fastener holes. For modeling, efforts should be focused on the regions around fastener holes. Fig.2 shows the three simplified locations where cracking could be seen to develop if exfoliation, intergranular corrosion, or pitting attack occurs around a countersunk fastener hole. Fig.2 General locations for pitting around fastener hole Case 2 represents a severe......
, and the nodal displacement parameter takes in the rail both sides. The fastener is replaced by a linear spring and damp, and Kul represents the lateral spring factor, Cul the lateral damping factor... and potential energy of inertial force of the rail and slab of track segment element can be deduced, and so as the elastic strain energy and potential energy of damping force of the CAM and fastener. Combining......
色金属学报, 2010, 20(S1): s70-s74. SHANG Guo-qiang, WANG Xin-nan, TANG Bin, ZHU Zhi-shou, KOU Hong-chao, ZHANG Feng-shou, CHANG Hui. Property evaluation of Ti-45Nb alloy wires used in fastener [J..., ZHANG Feng-shou, GONG Shao-mei. Study on heat treatment processing of Ti-45Nb alloy used in fastener [J]. Titanium Industry Progress, 2010, 27(6): 24-26. [9] TANG Bin, KOU Hong-chao, ZHU Zhi-shou, LI......
, 2018, 53(5): 928-936, 1094. SHENG Xi, ZHAO Caiyou, WANG Ping, et al. Effects of fastener stiffness of monolithic bed track on vertical rail sound power characteristics[J]. Journal of Southwest Jiaotong University, 2018, 53(5): 928-936, 1094. [6] LI Li, THOMPSON D, XIE Yingsong, et al. Influence of rail fastener stiffness on railway vehicle interior noise[J]. Applied Acoustics, 2019, 145: 69-81......
样表面的多个裂纹源主要与试样表面加工有关. 3) WST生产棒材加工的MJ12长螺纹螺栓的疲劳性能满足设计标准要求,且组织细小均匀. REFERENCES [1] 刘风雷. 我国航空钛紧固件的发展[J]. 航空制造技术, 2000(6): 39-40.LIU Feng-lei. Development of aeronautical Ti alloy fastener in China......
