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目的:针对典型高铁轨道结构,对钢轨减振器的设计参数进行研究,进一步揭示钢轨减振器的工作机理,为合理设计和应用提供科学依据。创新点:运用基于傅里叶变换的无限长周期结构动态特性的分析方法,从轨道结构的频散特性、共振特性、振动衰减特性和振动能量(近似声辐射能力)等多个方面对钢轨减振器的参数进行研究;提出荷载移动对振动衰减率的影响问题。方法:运用基于傅里叶变换的无限长周期结构动态特性的分析方法,结合典型高铁轨道结构,对钢轨减振器的设计参数对轨道结构动力学特性的影响进行研究。研究的动力学特性包括:频散特性、共振特性、振动衰减特性和振动能量(近似声辐射能力)。结论:1.加装钢轨减振器会引入新的阻带,从而增加整个阻带的宽度;2.在移动和不移动的情况下,荷载的振动衰减率是不同的;荷载的高速移动会降低振动衰减率;3.从阻带尽量宽、振动衰减率尽量大和振动能量尽量小这三方面的要求来看,钢轨减振器的设计频率应该接近原来轨道结构的Pinned-Pinned频率,并且质量越大越好;4.如果能够保证足够高的阻尼,钢轨减振器的频率可以设计得比Pinned-Pinned频率低。
OBJECTIVE: To study the design parameters of rail shock absorbers for typical high-speed rail structures, further revealing the working mechanism of rail shock absorbers and providing a scientific basis for rational design and application. Innovative point: the use of Fourier transform based on the infinite periodic structure of the dynamic characteristics of the analysis method, from the dispersion characteristics of the track structure, resonance characteristics, vibration attenuation characteristics and vibration energy (approximate sound radiation) and other aspects of the rail minus The parameters of the vibrator are studied. The influence of load transfer on the vibration attenuation rate is proposed. Methods: Based on the analysis of the dynamic characteristics of infinite periodic structures based on Fourier transform and the typical high-speed rail structure, the influence of the design parameters of the rail damper on the dynamic characteristics of the orbital structure was studied. The kinetic properties studied include: dispersion characteristics, resonance characteristics, vibration attenuation characteristics and vibrational energy (approximate acoustic radiation capability). Conclusion: 1. The installation of rail damper will introduce a new stop band, thereby increasing the width of the stop band; 2. With and without moving the case, the load vibration attenuation rate is different; Reduce the vibration attenuation rate; 3 from the stopband to be as wide as possible, the vibration attenuation rate as large as possible and vibration energy as small as possible requirements of these three aspects, the design of the rail shock absorber should be close to the original frequency of the track structure of the Pinned-Pinned frequency, The bigger the better; 4. If you can guarantee a high enough damping, rail shock absorber frequency can be designed to be lower than the Pinned-Pinned frequency.