Theoretical Provement And Experimental Verification On Lateral Vibration Coupling Mechanism Of High-speed Rolling Stocks

Lateral vibration coupling mechanism is the basic rule of vibration behavior at present on high-speed rolling stocks, the main reason is design defects on bogie prototype of series ICE3, so passenger railway line is not a guarantee of stable and secure on high-speed rail use. Specifically, the design research and problem-solving on bogie prototype of series ICE3, only by the adaptive control mode to achieve the beforehand emendation on instability hunting oscillations of the bogie, partially losing its capacity for self-stabilization. Not only that, with the increase in speed, it will highlight the negative impact on anti-hunting high-frequency impedance, so lateral coupling relation is formed between car-bodies and running gears of high-speed rolling stock, and the coupling strength is dependant on the lateral general mass of full-assembled car-body, consequently the under-floor masses are suspended by rubber hangers. So, must cognize new characters of innovation and its limitations on series ICE3 correctly, and at this stage high-speed rail use needs special precautions of crosswind stability and its detrimental influence.Based on the previous studies, namely lateral vibration coupling of under-floor masses and its optimal design for the rubber suspensions, this article does further researches on theoretical provement and experimental verification on lateral vibration coupling mechanism of high-speed rolling stocks, Its technical crux is how to define behavior regularities of high-frequency vibrations on aluminum alloy car-body. According to the system stiffness and sampling statistical characteristics, the novel concept of singularity coefficient was proposed so as to describe the non-stationary and non-Gaussian process,and seize the following two act features of vibration, i.e ①Original configuration of trainset bogie, has been short of stability margin, and forming characteristics of the partial concave type tread wear, in extreme cases of type of local close contact, then forming small hunting oscillations, its singular coefficient is less than 2;②In-site regulation of long train bogie, higher is the parameter configuration of anti-hunting series stiffness, the more distinct the overdamped characteristics of car-body yaw is, so the interface of car-body to the rear bogie becomes the transmitting media of lateral high-frequency vibrations, its singular coefficient is more than 2.Combined with the track test of vibration on Alpine vehicle and its under-floor masses, compared dynamic simulation with test, both are very similar. Specifically, using small hunting oscillations as independent turbulence, lateral resonance coupling of higher under-floor masses, and cause the rubber hanging point of the weight of wedge failure, then to make aluminum alloy car-body lateral buffeting. Applied by using the singularity coefficient, the following three important mechanical determinants of lateral vibration coupling mechanism can be proved for high-speed rolling stock, i.e. sufficient excitation energy, vibrating transmission media and possibility of coupling resonance.Especially under the disturbances of sidewind to carbodies, the fluid-solid coupling effects will enhanced strongly if the lateral swing singularities occur in the motor suspensions, and cause momentum wheel vibration of gear box shell cracking. At last, the dynamic stiffness test contrast analysis of rubber hanging shows that, i.e high frequency vibration quality is not constant, because installation hanger and its connection relationship has its inherent flexibility, the actual quality of high frequency and vibration are coming down. Statistical energy analysis(SEA) has its inherent limitations, failing to consider(local) the influence of constraints on the modal inherent characteristic. Due to the influence on high-order modal truncations and residual forces of flexible carbodies, using the novel concept of singularity coefficient, the rigid-flexible coupled reflected the main statistical characteristics of the non-stationary and non-Gaussian process, revealed the present lateral vibration coupling mechanism of high-speed rolling stocks.