| As the continuous expansion of the coverage of railway network and improvement of railway efficiency in China,the mileage of main line on general railways has steadily increased.Main line on general-speed railway implements passenger and freight co-transportation.Due to the simultaneous operation of passenger and freight trains,there are great differences in vehicle structure dynamic performance and running speed,also the vehicle dynamics parameters of the same model also have a certain discreteness.Geometric requirements are different.Subdivide the line level,clarify the sensitive wavelength range of the dynamic geometric irregularity of the main line on general speed railway,and determine the vehicle dynamic response limit under the influence of the uncertain factors of the vehicle suspension.It is of great significance to the scientific evaluation and management of the track quality of main line on general speed railway.In this paper,taking the common passenger cars and freight cars of main line on general speed railway as the research object,combined with the multi-body system dynamics and the Latin hypercube sampling method,and considering a variety of factors,the track irregularity of main line on general speed railway common passenger cars and freight cars under the influence of different driving speeds is carried out.The research of multi-body system dynamics simulation analysis of sensitive wavelength range and vehicle dynamic response,the main research aspects are bellows:(1)The dynamic simulation model of the 8 multi-body system of passenger cars and freight cars commonly used in main line of general-speed railway is established considering the nonlinear mechanical characteristics of the bogie,and the appropriate wheel-rail matching type is selected,the model is verified in the time domain and frequency domain.(2)The inverse Fourier transform of the track irregularity power spectrum of the three major arterial lines is carried out to obtain the random track irregularity time-domain space samples,and the relationship between the dynamic response and the wavelength of different driving speeds and different types of vehicles is explored respectively.(3)Taking the random track irregularity space sample as the external disturbance of the vehicle,the power spectral density analysis,coherence analysis and transfer function of the railway track random irregularity and the vehicle dynamic response are analyzed,and main line of general-speed railway’s passenger car and freight car of different speed levels are given.Studies have shown that The driving speed affects the peak frequency of the vehicle acceleration power spectral density,that is,the sensitive wavelength.The correlations between the vertical and lateral accelerations of passenger cars and freight cars,respectively,and the mid-band longitudinal level and alignment are very significant.In addition,increasing the driving speed can cause the longitudinal level of the mid-band with good coherence and the increase of the frequency band width of the alignment.The vertical acceleration of the passenger and the freight cars has a good transferability with the longitudinal level in the medium and long bands,and the lateral acceleration of the passenger and the freight cars has a good transferability with the alignment in the medium band.(4)Considering the randomness of main dynamic parameters of vehicles in the long-term operation process,a random sample combination of main dynamic parameters of passenger cars and freight car commonly used on main line of general-speed railway is generated based on Latin hypercube sampling,and the randomness of key dynamic parameters of speed and vehicle is studied.Influence on vehicle response and its distribution,and determine vehicle dynamic response management limits.The vehicle body acceleration dynamic response results of the random parameter passenger car samples do not obey the normal distribution,while the freight car samples do. |
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